/* ================================================================================================= */
/* JamRoom Shared CSS - Design System and Common Components */
/* ================================================================================================= */

/* CSS Custom Properties (Variables) */
:root {
    /* Brand */
    --primary-color: #667eea;
    --primary-color-dark: #764ba2;
    --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);

    /* Semantic */
    --secondary-color: #64748b;
    --success-color: #16a34a;
    --danger-color: #dc2626;
    --warning-color: #d97706;
    --info-color: #0284c7;

    /* Surfaces and text */
    --app-bg: linear-gradient(135deg, #e8ecff 0%, #f3eaff 55%, #f9f4ff 100%);
    --surface-0: #ffffff;
    --surface-1: #f8f9ff;
    --surface-2: #f3f6fb;
    --surface-elevated: #ffffff;
    --text-color: #1f2937;
    --text-color-light: #475569;
    --text-inverse: #ffffff;
    --text-secondary: var(--text-color-light);
    --border-color: #dbe2ec;
    --border-color-light: #edf2f7;
    --focus-ring: rgba(102, 126, 234, 0.25);
    
    /* Shadows */
    --shadow-sm: 0 2px 4px rgba(0,0,0,0.05);
    --shadow-md: 0 4px 15px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 30px rgba(0,0,0,0.15);
    --shadow-xl: 0 15px 35px rgba(0,0,0,0.1), 0 5px 15px rgba(0,0,0,0.05);
    
    /* Typography */
    --font-family: 'Outfit', 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-size-xs: 0.75rem;   /* 12px */
    --font-size-sm: 0.875rem;  /* 14px */
    --font-size-md: 1rem;      /* 16px */
    --font-size-lg: 1.125rem;  /* 18px */
    --font-size-xl: 1.25rem;   /* 20px */
    --font-size-2xl: 1.5rem;   /* 24px */
    --font-size-3xl: 1.875rem; /* 30px */
    --font-size-4xl: 2.25rem;  /* 36px */
    
    /* Spacing */
    --spacing-xs: 0.25rem;  /* 4px */
    --spacing-sm: 0.5rem;   /* 8px */
    --spacing-md: 1rem;     /* 16px */
    --spacing-lg: 1.5rem;   /* 24px */
    --spacing-xl: 2rem;     /* 32px */
    --spacing-2xl: 3rem;    /* 48px */
    --spacing-3xl: 4rem;    /* 64px */

    /* Layout */
    --layout-page-max-width: 1200px;
    --layout-wide-max-width: 1400px;
    --layout-page-padding-mobile: 12px;
    --layout-page-padding-desktop: 20px;

    /* Controls */
    --control-height: 42px;
    --control-height-compact: 38px;
    --touch-target-min: 40px;

    /* Header actions */
    --header-action-btn-padding-y: 9px;
    --header-action-btn-padding-x: 14px;
    --header-action-btn-font-size: 0.92rem;

    /* Auth cards */
    --auth-card-max-width: 450px;
    --auth-card-padding-y: 34px;
    --auth-card-padding-x: 24px;
    --auth-card-radius: 16px;
    --auth-card-padding-y-mobile: 24px;
    --auth-card-padding-x-mobile: 18px;
    --auth-card-radius-mobile: 12px;
    
    /* Border Radius */
    --radius-sm: 5px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 15px;
    
    /* Transitions */
    --transition-fast: all 0.15s ease;
    --transition-normal: all 0.3s ease;
    --transition-slow: all 0.5s ease;
    --transition-colors: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease;
    --transition-elevation: box-shadow 0.2s ease, transform 0.2s ease;

    /* Backward-compatible aliases */
    --dark-color: #2c3e50;
    --dark-color-light: #34495e;
    --bg-light: var(--surface-1);
    --bg-white: var(--surface-0);
}

:root[data-theme='dark'] {
    --app-bg: linear-gradient(135deg, #111827 0%, #15192a 60%, #1d1730 100%);
    --surface-0: #111827;
    --surface-1: #182235;
    --surface-2: #1f2b44;
    --surface-elevated: #1a2438;
    --text-color: #e5e7eb;
    --text-color-light: #cbd5e1;
    --text-inverse: #0f172a;
    --text-secondary: var(--text-color-light);
    --border-color: #2f3a53;
    --border-color-light: #2b354a;
    --focus-ring: rgba(129, 140, 248, 0.35);

    --secondary-color: #94a3b8;
    --success-color: #22c55e;
    --danger-color: #f87171;
    --warning-color: #f59e0b;
    --info-color: #38bdf8;

    --dark-color: #0f172a;
    --dark-color-light: #1e293b;
    --bg-light: var(--surface-1);
    --bg-white: var(--surface-0);
}

@media (prefers-color-scheme: dark) {
    :root:not([data-theme]) {
        --app-bg: linear-gradient(135deg, #111827 0%, #15192a 60%, #1d1730 100%);
        --surface-0: #111827;
        --surface-1: #182235;
        --surface-2: #1f2b44;
        --surface-elevated: #1a2438;
        --text-color: #e5e7eb;
        --text-color-light: #cbd5e1;
        --text-secondary: var(--text-color-light);
        --border-color: #2f3a53;
        --border-color-light: #2b354a;
        --bg-light: var(--surface-1);
        --bg-white: var(--surface-0);
    }
}

/* ================================================================================================= */
/* Base Styles */
/* ================================================================================================= */

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font-family);
    line-height: 1.6;
    background: var(--app-bg);
    min-height: 100vh;
    padding: 12px;
    letter-spacing: -0.01em;
    color: var(--text-color);
    transition: background-color 0.3s ease, color 0.3s ease;
}

@media (min-width: 768px) {
    body {
        padding: 20px;
    }
}

/* ================================================================================================= */
/* Layout Components */
/* ================================================================================================= */

.container {
    max-width: 1200px;
    margin: 0 auto;
    background: var(--surface-elevated);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    overflow: hidden;
}

.container-fluid {
    max-width: 1400px;
    margin: 0 auto;
}

.app-container {
    max-width: 1200px;
    margin: 0 auto;
    background: var(--surface-elevated);
    border: 1px solid var(--border-color-light);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    overflow: hidden;
}

.app-header {
    color: var(--text-inverse);
    padding: 0;
    display: flex;
    align-items: flex-end;
    justify-content: flex-end;
    gap: 14px;
    min-width: 0;
    position: relative;
    aspect-ratio: 1755 / 674;
    width: 100%;
    background-image: url('/icons/header-image.jpg');
    background-size: 100% 100%;
    background-repeat: no-repeat;
    background-position: center;
    overflow: hidden;
}

.app-header h1 {
    margin: 0;
    font-size: clamp(1.3rem, 1.8vw, 1.9rem);
    overflow-wrap: anywhere;
    text-align: center;
}

.app-brand {
    display: none;
}

.app-brand-logo {
    width: 54px;
    height: 54px;
    border-radius: 12px;
    border: 1px solid color-mix(in srgb, var(--text-inverse) 32%, transparent);
    background: color-mix(in srgb, var(--text-inverse) 18%, transparent);
    padding: 4px;
    object-fit: contain;
    margin: 0 auto;
}

.app-subtitle {
    margin: 0;
    color: color-mix(in srgb, var(--text-inverse) 92%, transparent);
    font-size: 0.95rem;
    font-weight: 500;
    overflow-wrap: anywhere;
}

.app-brand-address {
    margin: 0;
    color: color-mix(in srgb, var(--text-inverse) 96%, transparent);
    font-size: 0.86rem;
    font-weight: 500;
    line-height: 1.35;
    overflow-wrap: anywhere;
}

.app-greeting {
    margin: 2px 0 0;
    color: color-mix(in srgb, var(--text-inverse) 95%, transparent);
    font-size: 0.9rem;
    font-weight: 600;
    overflow-wrap: anywhere;
}

.app-header-greeting {
    margin: 0;
    display: none;
    align-items: center;
    justify-content: center;
    align-self: flex-end;
    padding: 8px 12px;
    border-radius: 999px;
    background: color-mix(in srgb, var(--text-inverse) 18%, transparent);
    border: 1px solid color-mix(in srgb, var(--text-inverse) 36%, transparent);
    color: color-mix(in srgb, var(--text-inverse) 98%, transparent);
    font-size: 0.92rem;
    font-weight: 700;
    line-height: 1.15;
    max-width: 100%;
    overflow-wrap: anywhere;
}

.app-header-actions {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 8px;
    min-width: 0;
    position: absolute;
    bottom: 3.5%;
    right: 2.5%;
    width: 14%;
}

.app-header-actions-primary {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 8px;
    flex-wrap: wrap;
}

.app-header-actions-primary .btn,
.app-header-actions-primary a {
    margin: 0;
    padding: 9px 14px;
    font-size: 0.92rem;
    min-height: 38px;
    line-height: 1.15;
}

.main-nav {
    background: var(--surface-2);
    border-bottom: 1px solid var(--border-color);
    padding: 12px 14px;
    display: flex;
    justify-content: flex-start;
    align-items: center;
    flex-wrap: wrap;
    gap: 10px;
    min-width: 0;
}

.main-nav-toggle {
    display: none;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
}

.main-nav .nav-links {
    width: 100%;
    min-width: 0;
}

.nav-link {
    color: var(--text-color);
    text-decoration: none;
    padding: 9px 12px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    min-height: 42px;
    border-radius: var(--radius-md);
    transition: var(--transition-normal);
    font-weight: 600;
    border: 1px solid var(--border-color-light);
    background: var(--surface-elevated);
    min-width: 0;
    overflow-wrap: anywhere;
}

.nav-link-icon {
    font-size: 1rem;
    line-height: 1;
}

.nav-link-label {
    line-height: 1.15;
}

.nav-link:hover,
.nav-link.active {
    background: color-mix(in srgb, var(--primary-color) 14%, var(--surface-elevated));
    border-color: color-mix(in srgb, var(--primary-color) 40%, var(--border-color));
}

.user-name {
    color: var(--text-color);
    font-weight: 600;
    padding: 6px 8px;
}

.main-nav .user-info {
    justify-content: flex-end;
    min-width: 0;
}

.main-nav .user-info button,
.main-nav .user-info a {
    margin-left: 0;
}

.btn-theme-toggle {
    white-space: nowrap;
}

/* ================================================================================================= */
/* Header & Navigation */
/* ================================================================================================= */

header {
    background: var(--primary-gradient);
    color: white;
    padding: 40px 30px;
    text-align: center;
}

header.white {
    background: var(--surface-elevated);
    color: var(--text-color);
    padding: 25px 35px;
    border-radius: var(--radius-lg);
    margin-bottom: 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 4px 20px rgba(0,0,0,0.08);
    border: 1px solid var(--border-color-light);
}

header h1 {
    font-size: 2.75em;
    font-weight: 700;
    margin-bottom: 12px;
    letter-spacing: -0.02em;
}

header.white h1 {
    font-size: 1.75em;
    margin-bottom: 0;
}

header p {
    font-size: 1.25em;
    opacity: 0.9;
    font-weight: 400;
}

nav {
    background: var(--dark-color);
    padding: 20px 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    border-bottom: 3px solid var(--dark-color-light);
}

nav a {
    color: var(--text-inverse);
    text-decoration: none;
    margin: 0 12px;
    padding: 10px 18px;
    border-radius: var(--radius-md);
    transition: var(--transition-normal);
    font-weight: 500;
    font-size: 0.95em;
}

nav a:hover {
    background: rgba(255, 255, 255, 0.16);
    transform: translateY(-1px);
}

.user-info {
    display: flex;
    align-items: center;
    gap: 15px;
    flex-wrap: wrap;
}

.user-info button, 
.user-info a {
    margin-left: 10px;
}

.theme-toggle-fab {
    position: fixed;
    right: 14px;
    bottom: max(14px, env(safe-area-inset-bottom));
    z-index: 1002;
    border: 1px solid var(--border-color);
    background: var(--surface-elevated);
    color: var(--text-color);
    border-radius: 999px;
    padding: 9px 14px;
    font-weight: 600;
    cursor: pointer;
    box-shadow: var(--shadow-md);
}

.theme-toggle-fab:hover {
    box-shadow: var(--shadow-lg);
}

/* ================================================================================================= */
/* Button System */
/* ================================================================================================= */

.btn {
    padding: 12px 24px;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    font-size: var(--font-size-md);
    font-weight: 600;
    transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease, transform 0.2s ease;
    text-decoration: none;
    display: inline-block;
    letter-spacing: 0.01em;
    font-family: inherit;
    line-height: 1.2;
}

.btn:hover {
    transform: translateY(-2px);
}

.btn:active {
    transform: translateY(0);
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

/* Button Variants */
.btn-primary {
    background: var(--primary-gradient);
    color: white;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.3);
}

.btn-primary:hover {
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.4);
}

.btn-secondary {
    background: var(--secondary-color);
    color: white;
}

.btn-secondary:hover {
    background: #545b62;
}

/* Override secondary for colored variants */
.btn.btn-success {
    background: var(--success-color) !important;
    color: white !important;
}

.btn.btn-success:hover {
    background: #15803d !important;
}

.btn.btn-danger {
    background: var(--danger-color) !important;
    color: white !important;
}

.btn.btn-danger:hover {
    background: #b91c1c !important;
}

.btn.btn-warning {
    background: var(--warning-color) !important;
    color: var(--dark-color) !important;
}

.btn.btn-warning:hover {
    background: #b45309 !important;
}

.btn.btn-info {
    background: var(--info-color) !important;
    color: white !important;
}

.btn.btn-info:hover {
    background: #0369a1 !important;
}

.btn.btn-primary {
    background: var(--primary-gradient) !important;
    color: white !important;
}

/* Button Sizes */
.btn-sm {
    padding: 8px 16px;
    font-size: var(--font-size-sm);
}

.btn-lg {
    padding: 16px 32px;
    font-size: var(--font-size-lg);
}

/* Button Layout Modifiers */
.btn-flex {
    flex: 1;
}

.btn-full {
    width: 100%;
}

/* Button Styles */
.btn-outline {
    background: transparent;
    border: 2px solid currentColor;
}

.btn-outline.btn-primary {
    color: var(--primary-color);
    border-color: var(--primary-color);
}

.btn-outline.btn-primary:hover {
    background: var(--primary-color);
    color: white;
}

/* ================================================================================================= */
/* Auth Page Primitives */
/* ================================================================================================= */

.auth-page {
    min-height: 100vh;
    padding: var(--layout-page-padding-mobile);
}

.auth-page #navigationContainer {
    margin-bottom: 18px;
}

.auth-card {
    background: var(--surface-elevated);
    color: var(--text-color);
    padding: var(--auth-card-padding-y) var(--auth-card-padding-x);
    border-radius: var(--auth-card-radius);
    box-shadow: var(--shadow-xl);
    max-width: var(--auth-card-max-width);
    width: 100%;
    border: 1px solid var(--border-color-light);
    margin: 0 auto;
}

.auth-page .form-group {
    margin-bottom: 20px;
}

.auth-page label {
    display: block;
    margin-bottom: 8px;
    color: var(--text-color);
    font-weight: 600;
}

.auth-page input,
.auth-page textarea {
    width: 100%;
    padding: 12px;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: var(--font-size-md);
    transition: var(--transition-normal);
    background: var(--surface-0);
    color: var(--text-color);
}

.auth-page input:focus,
.auth-page textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px var(--focus-ring);
}

.auth-page .btn {
    width: 100%;
    padding: 14px;
    border-radius: 10px;
    font-size: 1.05em;
    margin-top: 10px;
}

.auth-page .btn:disabled {
    background: var(--secondary-color);
    cursor: not-allowed;
}

.auth-page .links {
    text-align: center;
    margin-top: 20px;
}

.auth-page .links a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
}

.auth-page .links a:hover {
    text-decoration: underline;
}

.auth-page .back-home {
    text-align: center;
    margin-top: 20px;
}

.auth-page .back-home a {
    color: var(--text-color-light);
    text-decoration: none;
}

.auth-page .back-home a:hover {
    color: var(--text-color);
}

/* ================================================================================================= */
/* Form Components */
/* ================================================================================================= */

.form-group {
    margin-bottom: 25px;
}

label {
    display: block;
    margin-bottom: 10px;
    font-weight: 600;
    color: var(--text-color);
    font-size: 0.95em;
    letter-spacing: 0.01em;
}

input, 
select, 
textarea {
    width: 100%;
    padding: 14px 16px;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: var(--font-size-md);
    transition: var(--transition-normal);
    background: var(--surface-0);
    color: var(--text-color);
    font-family: inherit;
}

input[type="radio"],
input[type="checkbox"] {
    width: auto;
    max-width: none;
    padding: 0;
}

input:focus, 
select:focus, 
textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px var(--focus-ring);
}

select:disabled,
input:disabled,
textarea:disabled {
    background-color: var(--surface-2);
    color: var(--text-color-light);
    cursor: not-allowed;
}

.input-group {
    display: flex;
    gap: var(--spacing-md);
}

.input-group.two-col {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
}

.input-group.three-col {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 15px;
}

/* ================================================================================================= */
/* Alert System */
/* ================================================================================================= */

.alert {
    padding: 15px;
    border-radius: var(--radius-md);
    margin-bottom: 20px;
    display: none;
    font-weight: 500;
    border: 2px solid;
}

.alert.show {
    display: block;
}

.alert.fixed {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    min-width: 300px;
    max-width: 500px;
    z-index: 1001;
    box-shadow: 0 4px 20px rgba(0,0,0,0.3);
    text-align: center;
}

.alert-success {
    background: color-mix(in srgb, var(--success-color) 16%, transparent);
    color: var(--text-color);
    border-color: color-mix(in srgb, var(--success-color) 40%, transparent);
}

.alert-error,
.alert-danger {
    background: color-mix(in srgb, var(--danger-color) 16%, transparent);
    color: var(--text-color);
    border-color: color-mix(in srgb, var(--danger-color) 40%, transparent);
}

.alert-warning {
    background: color-mix(in srgb, var(--warning-color) 16%, transparent);
    color: var(--text-color);
    border-color: color-mix(in srgb, var(--warning-color) 40%, transparent);
}

.alert-info {
    background: color-mix(in srgb, var(--info-color) 16%, transparent);
    color: var(--text-color);
    border-color: color-mix(in srgb, var(--info-color) 40%, transparent);
}

/* Alert Backdrop */
.alert-backdrop {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.4);
    z-index: 1000;
    display: none;
}

.alert-backdrop.show {
    display: block;
}

/* ================================================================================================= */
/* Section & Card Components */
/* ================================================================================================= */

.section {
    background: var(--surface-elevated);
    padding: 30px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    margin-bottom: 20px;
}

.stat-card {
    background: var(--surface-elevated);
    padding: 30px;
    border-radius: 12px;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color-light);
    transition: var(--transition-normal);
}

.stat-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.stat-card h3 {
    color: var(--text-color-light);
    font-size: 0.9em;
    margin-bottom: 12px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-weight: 600;
}

.stat-card .number {
    font-size: 2.75em;
    color: var(--primary-color);
    font-weight: 700;
    letter-spacing: -0.02em;
}

.stat-card .number.stat-number-loading {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--text-color-light);
    font-size: 1.05rem;
    font-weight: 600;
    letter-spacing: 0;
}

.stat-card .number.stat-number-loading::before {
    content: '';
    width: 14px;
    height: 14px;
    border: 2px solid color-mix(in srgb, var(--primary-color) 30%, transparent);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

.section-header {
    cursor: default;
    margin-bottom: 20px;
}

.section-header h2 {
    color: var(--text-color);
    font-size: var(--font-size-2xl);
    font-weight: 600;
    margin: 0;
}

.card {
    background: var(--surface-elevated);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
    transition: var(--transition-normal);
    border: 1px solid var(--border-color-light);
}

.card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.card-header {
    padding: 20px 25px;
    background: var(--surface-1);
    border-bottom: 1px solid var(--border-color);
    font-weight: 600;
}

.card-body {
    padding: 25px;
}

.card-footer {
    padding: 20px 25px;
    background: var(--surface-1);
    border-top: 1px solid var(--border-color);
}

.collapsible-panel {
    background: var(--surface-elevated);
    border: 1px solid var(--border-color-light);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.collapsible-panel > summary {
    list-style: none;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    width: 100%;
    cursor: pointer;
    padding: 18px 20px;
    background: var(--surface-1);
    color: var(--text-color);
    font-weight: 600;
}

.collapsible-panel > summary::-webkit-details-marker {
    display: none;
}

.collapsible-panel > summary::after {
    content: '▶';
    flex-shrink: 0;
    font-size: 0.8rem;
    color: var(--text-color-light);
    transition: transform 0.2s ease;
}

.collapsible-panel[open] > summary::after {
    transform: rotate(90deg);
}

.collapsible-panel-title {
    margin: 0;
    font-size: var(--font-size-2xl);
    font-weight: 600;
    color: var(--text-color);
}

.collapsible-panel-body {
    padding: 20px;
    border-top: 1px solid var(--border-color-light);
}

/* ================================================================================================= */
/* Tab System */
/* ================================================================================================= */

.tab-container {
    margin-bottom: 30px;
}

.tab-buttons {
    display: flex;
    margin-bottom: 20px;
    border-bottom: 2px solid var(--border-color);
    flex-wrap: wrap;
}

.tab-btn {
    background: none;
    border: none;
    padding: 15px 25px;
    cursor: pointer;
    font-size: var(--font-size-md);
    font-weight: 600;
    color: var(--text-color-light);
    transition: var(--transition-normal);
    border-bottom: 3px solid transparent;
    font-family: inherit;
}

.tab-btn.active {
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
}

.tab-btn:hover {
    color: var(--primary-color);
    background: color-mix(in srgb, var(--primary-color) 8%, transparent);
}

.tab-pane {
    display: none;
}

.tab-pane.active {
    display: block;
}

/* ================================================================================================= */
/* Payment Components */
/* ================================================================================================= */

.payment-info {
    background: var(--bg-light);
    padding: 30px;
    border-radius: var(--radius-lg);
    border-left: 4px solid var(--primary-color);
}

.payment-method {
    margin-bottom: 25px;
    padding: 20px;
    background: var(--surface-elevated);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
}

.quick-payment {
    background: var(--primary-gradient);
    color: white;
    padding: 25px;
    border-radius: var(--radius-lg);
    margin-bottom: 25px;
    text-align: center;
}

.payment-btn {
    border: none;
    border-radius: var(--radius-md);
    color: white;
    font-weight: 500;
    cursor: pointer;
    font-size: var(--font-size-sm);
    transition: var(--transition-normal);
    font-family: inherit;
}

.payment-btn:hover {
    transform: translateY(-1px);
    opacity: 0.9;
}

.upi-details {
    background: var(--primary-gradient);
    color: white;
    padding: 25px;
    border-radius: var(--radius-lg);
    margin-bottom: 20px;
}

.upi-card {
    background: color-mix(in srgb, var(--info-color) 12%, var(--surface-elevated));
    padding: 20px;
    border-radius: var(--radius-lg);
    margin-bottom: 20px;
    border: 2px solid color-mix(in srgb, var(--info-color) 45%, transparent);
    width: 100%;
    max-width: 100%;
    overflow: visible;
}

.upi-id {
    font-size: 24px;
    font-weight: bold;
    margin: 10px 0;
    padding: 15px;
    background: rgba(255,255,255,0.2);
    border-radius: var(--radius-md);
    text-align: center;
    letter-spacing: 0.5px;
    white-space: normal;
    overflow-wrap: anywhere;
    word-break: break-word;
    line-height: 1.35;
    max-width: 100%;
}

.copy-btn {
    background: rgba(255,255,255,0.2);
    border: 1px solid rgba(255,255,255,0.3);
    color: white;
    padding: 8px 15px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: var(--font-size-sm);
    transition: var(--transition-normal);
    font-family: inherit;
}

.copy-btn:hover {
    background: rgba(255,255,255,0.3);
}

/* ================================================================================================= */
/* Grid System */
/* ================================================================================================= */

.grid {
    display: grid;
    gap: var(--spacing-lg);
}

.grid-2 {
    grid-template-columns: 1fr 1fr;
}

.grid-3 {
    grid-template-columns: 1fr 1fr 1fr;
}

.grid-auto {
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.main-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
}

/* ================================================================================================= */
/* Utility Classes */
/* ================================================================================================= */

.hidden {
    display: none !important;
}

.show {
    display: block !important;
}

.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
}

.modal.show {
    display: flex !important;
    align-items: center;
    justify-content: center;
}

.modal-content {
    background: var(--surface-elevated);
    border: 1px solid var(--border-color-light);
    padding: 30px;
    border-radius: 10px;
    max-width: 500px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
}

.modal-actions-row {
    display: flex;
    gap: 10px;
    margin-top: 20px;
}

.text-center {
    text-align: center;
}

.text-left {
    text-align: left;
}

.text-right {
    text-align: right;
}

.font-weight-bold {
    font-weight: 700;
}

.font-weight-normal {
    font-weight: 400;
}

.text-primary {
    color: var(--primary-color);
}

.text-secondary {
    color: var(--text-color-light);
}

.text-success {
    color: var(--success-color);
}

.text-danger {
    color: var(--danger-color);
}

.text-warning {
    color: var(--warning-color);
}

.text-info {
    color: var(--info-color);
}

/* Empty state helper */
.text-center-muted-padded {
    text-align: center;
    padding: 20px;
    color: var(--text-color-light);
}

.bg-primary {
    background: var(--primary-gradient);
    color: white;
}

.bg-light {
    background: var(--bg-light);
}

.bg-white {
    background: var(--bg-white);
}

.shadow-sm {
    box-shadow: var(--shadow-sm);
}

.shadow-md {
    box-shadow: var(--shadow-md);
}

.shadow-lg {
    box-shadow: var(--shadow-lg);
}

.rounded {
    border-radius: var(--radius-md);
}

.rounded-lg {
    border-radius: var(--radius-lg);
}

.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: var(--spacing-xs); }
.mb-2 { margin-bottom: var(--spacing-sm); }
.mb-3 { margin-bottom: var(--spacing-md); }
.mb-4 { margin-bottom: var(--spacing-lg); }
.mb-5 { margin-bottom: var(--spacing-xl); }

.mt-0 { margin-top: 0; }
.mt-1 { margin-top: var(--spacing-xs); }
.mt-2 { margin-top: var(--spacing-sm); }
.mt-3 { margin-top: var(--spacing-md); }
.mt-4 { margin-top: var(--spacing-lg); }
.mt-5 { margin-top: var(--spacing-xl); }

.p-0 { padding: 0; }
.p-1 { padding: var(--spacing-xs); }
.p-2 { padding: var(--spacing-sm); }
.p-3 { padding: var(--spacing-md); }
.p-4 { padding: var(--spacing-lg); }
.p-5 { padding: var(--spacing-xl); }

.loading:not(button):not(input):not(select):not(textarea):not(.btn) {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    width: 100%;
    min-height: 40px;
    padding: 16px 20px;
    color: var(--text-color-light);
    line-height: 1.4;
    border: 0;
    border-radius: 0;
    animation: none;
    transform: none;
}

.loading:not(button):not(input):not(select):not(textarea):not(.btn)::before {
    content: '';
    width: 16px;
    height: 16px;
    border: 2px solid color-mix(in srgb, var(--primary-color) 30%, transparent);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 0.85s linear infinite;
    flex-shrink: 0;
}

.loader {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid color-mix(in srgb, var(--primary-color) 30%, transparent);
    border-top: 3px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

.boot-loader-chip {
    position: fixed;
    top: 10px;
    right: 10px;
    z-index: 12000;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 5px 8px;
    border-radius: 999px;
    border: 1px solid var(--border-color);
    background: color-mix(in srgb, var(--surface-elevated) 96%, transparent);
    color: var(--text-color-light);
    box-shadow: var(--shadow-sm);
    font-size: 0.72rem;
    opacity: 0;
    transform: translateY(-4px);
    transition: opacity 0.18s ease, transform 0.18s ease;
    pointer-events: none;
}

.boot-loader-chip.show {
    opacity: 1;
    transform: translateY(0);
}

.boot-loader-spinner {
    width: 10px;
    height: 10px;
    border: 2px solid color-mix(in srgb, var(--primary-color) 24%, transparent);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

.nav-loading-shell {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    min-height: 42px;
    padding: 8px;
    color: var(--text-color-light);
    font-size: 0.78rem;
    background: var(--surface-2);
    border-bottom: 1px solid var(--border-color);
}

.nav-loading-spinner {
    width: 12px;
    height: 12px;
    border: 2px solid color-mix(in srgb, var(--primary-color) 24%, transparent);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

.section-loading-inline {
    display: flex;
    align-items: center;
    gap: 10px;
    justify-content: center;
    padding: 20px;
}

.section-loader-tiny {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 5px 8px;
    border: 1px solid var(--border-color-light);
    border-radius: 8px;
    background: color-mix(in srgb, var(--surface-1) 92%, transparent);
    color: var(--text-color-light);
    font-size: 0.76rem;
}

.section-loader-tiny-spinner {
    width: 10px;
    height: 10px;
    border: 2px solid color-mix(in srgb, var(--primary-color) 24%, transparent);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

.utils-loading-overlay {
    position: fixed;
    inset: 0;
    background: color-mix(in srgb, var(--surface-elevated) 86%, transparent);
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100vw;
    height: 100vh;
    padding: 20px;
    box-sizing: border-box;
    z-index: 9999;
}

.utils-loading-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 12px;
    text-align: center;
}

.utils-loading-spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--border-color-light);
    border-top: 3px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0;
}

.utils-loading-message {
    color: var(--text-color-light);
    font-size: 16px;
}

.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: color-mix(in srgb, var(--surface-elevated) 88%, transparent);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    display: none;
}

.loading-overlay.show {
    display: flex;
}

.loading-content {
    text-align: center;
    font-size: 1.2em;
    color: var(--primary-color);
}

.loading-content .loader {
    width: 40px;
    height: 40px;
    margin-bottom: 20px;
}

.btn.loading {
    position: relative;
    pointer-events: none;
    opacity: 0.7;
}

.btn.loading::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 16px;
    height: 16px;
    border: 2px solid transparent;
    border-top: 2px solid currentColor;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

.payment-dialog-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.7);
    z-index: 10000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.payment-dialog-box {
    background: var(--surface-elevated);
    color: var(--text-color);
    border-radius: 12px;
    padding: 25px;
    max-width: 500px;
    width: 100%;
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border-color-light);
}

.payment-dialog-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 20px;
}

.payment-dialog-icon {
    font-size: 24px;
}

.payment-dialog-title {
    margin: 0;
    color: var(--text-color);
}

.payment-dialog-body,
.payment-dialog-content {
    color: var(--text-color-light);
    line-height: 1.6;
}

.payment-dialog-list {
    margin: 10px 0;
    padding-left: 20px;
}

.payment-dialog-actions {
    margin-top: 15px;
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.payment-dialog-btn {
    color: var(--text-inverse);
    border: none;
    padding: 8px 16px;
    border-radius: 6px;
    cursor: pointer;
    font-family: inherit;
    font-size: 0.95rem;
}

.payment-dialog-btn-success {
    background: var(--success-color);
}

.payment-dialog-btn-secondary {
    background: var(--secondary-color);
}

.payment-toast {
    position: fixed;
    top: 20px;
    right: 20px;
    padding: 15px 20px;
    border-radius: 8px;
    color: var(--text-inverse);
    font-weight: 500;
    z-index: 10000;
    box-shadow: var(--shadow-md);
    transition: opacity 0.3s ease;
    max-width: 300px;
}

.payment-toast-success {
    background: var(--success-color);
}

.payment-toast-error {
    background: var(--danger-color);
}

.payment-toast-info {
    background: var(--info-color);
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* ================================================================================================= */
/* Responsive Design */
/* ================================================================================================= */

@media (max-width: 768px) {
    body {
        padding: 10px;
    }

    .app-header {
        padding: 0 10px 10px;
        flex-direction: column;
        align-items: stretch;
        justify-content: flex-start;
        gap: 8px;
        overflow: visible;
        aspect-ratio: unset;
        min-height: unset;
        background-image: url('/icons/header-image.jpg');
        background-size: 100% auto;
        background-repeat: no-repeat;
        background-position: top center;
        padding-top: calc(100% * 674 / 1755);
    }

    .app-header h1 {
        font-size: 1.22rem;
        line-height: 1.25;
        text-align: center;
    }

    .app-brand {
        display: none;
        position: static;
        transform: none;
        align-items: center;
        gap: 6px;
    }

    .app-header-actions {
        position: static;
        width: 100%;
        min-width: 0;
        max-width: none;
        align-items: stretch;
        display: flex;
        flex-direction: column;
        justify-content: flex-start;
        gap: 6px;
    }

    .app-brand-logo {
        width: 56px;
        height: 56px;
        margin: 0 auto;
    }

    .app-subtitle {
        font-size: 0.82rem;
    }
}

/* =============================================
   Lesson Tracker Accordion
   ============================================= */

.lesson-accordion-list {
    margin: 0;
    padding: 0;
    list-style: none;
    display: grid;
    gap: 4px;
}

.lesson-accordion-list li {
    border: 1px solid var(--border-color);
    border-radius: 6px;
    overflow: hidden;
}

.lesson-accordion {
    width: 100%;
}

.lesson-accordion-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 8px;
    padding: 8px 12px;
    cursor: pointer;
    list-style: none;
    user-select: none;
    background: var(--card-bg, var(--bg-color));
    transition: background 0.15s;
}

.lesson-accordion-header::-webkit-details-marker {
    display: none;
}

.lesson-accordion-header::after {
    content: '▶';
    font-size: 0.65em;
    opacity: 0.5;
    flex-shrink: 0;
    transition: transform 0.2s;
}

details[open] > .lesson-accordion-header::after {
    transform: rotate(90deg);
}

.lesson-accordion-week {
    font-weight: 600;
    font-size: 0.9em;
}

.lesson-status-badge {
    display: inline-block;
    padding: 2px 10px;
    border-radius: 12px;
    font-size: 0.75em;
    font-weight: 600;
    letter-spacing: 0.03em;
    white-space: nowrap;
}

.lesson-status-completed {
    background: color-mix(in srgb, var(--success-color) 15%, transparent);
    color: var(--success-color);
    border: 1px solid color-mix(in srgb, var(--success-color) 40%, transparent);
}

.lesson-status-scheduled {
    background: color-mix(in srgb, var(--warning-color) 15%, transparent);
    color: var(--warning-color);
    border: 1px solid color-mix(in srgb, var(--warning-color) 40%, transparent);
}

.lesson-status-cancelled {
    background: color-mix(in srgb, var(--danger-color) 15%, transparent);
    color: var(--danger-color);
    border: 1px solid color-mix(in srgb, var(--danger-color) 40%, transparent);
}

.lesson-accordion-body {
    padding: 10px 12px;
    border-top: 1px solid var(--border-color);
    display: grid;
    gap: 5px;
    background: color-mix(in srgb, var(--bg-color) 60%, transparent);
}

.lesson-accordion-body p {
    margin: 0;
    font-size: 0.87em;
    color: var(--text-color-light);
    line-height: 1.5;
}

@media (max-width: 768px) {
    .app-greeting {
        font-size: 0.8rem;
    }

    .app-header-greeting {
        display: none;
        font-size: 0.88rem;
        padding: 8px 10px;
    }

    .app-header-actions {
        width: 100%;
        min-width: 0;
        max-width: none;
        position: static;
        align-items: stretch;
        display: flex;
        flex-direction: column;
        justify-content: flex-start;
        gap: 6px;
    }

    .app-header-actions-primary {
        width: 100%;
        display: grid;
        grid-template-columns: 1fr;
        gap: 6px;
    }

    .app-header-actions-primary .btn,
    .app-header-actions-primary a {
        width: 100%;
        text-align: center;
        padding: 8px 10px;
        font-size: 0.82rem;
        min-height: 34px;
        min-width: 0;
        white-space: normal;
        overflow-wrap: anywhere;
    }

    .main-nav {
        padding: 8px;
        align-items: stretch;
        gap: 8px;
        border-top: 1px solid color-mix(in srgb, var(--primary-color) 28%, transparent);
    }

    .main-nav-toggle {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        width: 100%;
        min-height: 42px;
        padding: 8px 10px;
        border: 1px solid var(--border-color-light);
        border-radius: var(--radius-md);
        background: var(--surface-elevated);
        color: var(--text-color);
        font-weight: 700;
        cursor: pointer;
    }

    .main-nav.is-collapsed .nav-links {
        display: none;
    }

    .main-nav .nav-links {
        display: grid;
        grid-template-columns: repeat(2, minmax(0, 1fr));
        gap: 8px;
    }

    .main-nav .nav-link {
        text-align: center;
        padding: 10px 12px;
        min-height: 44px;
        font-size: 0.96rem;
        line-height: 1.2;
        white-space: normal;
        overflow-wrap: anywhere;
    }

    .main-content {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .grid-2,
    .grid-3 {
        grid-template-columns: 1fr;
    }
    
    .input-group.two-col,
    .input-group.three-col {
        grid-template-columns: 1fr;
        gap: 10px;
    }
    
    nav {
        padding: 15px;
        flex-direction: column;
        gap: 15px;
    }
    
    nav > div {
        display: flex;
        flex-wrap: wrap;
        justify-content: center;
        gap: 10px;
    }
    
    nav a {
        margin: 0 5px;
        padding: 8px 12px;
        font-size: 0.9em;
    }
    
    .user-info {
        gap: 10px;
        justify-content: center;
    }
    
    header h1 {
        font-size: 2em;
    }
    
    header p {
        font-size: 1em;
    }
    
    .section {
        padding: 20px;
        margin-bottom: 15px;
    }
    
    .tab-buttons {
        flex-wrap: wrap;
    }
    
    .tab-btn {
        padding: 12px 18px;
        font-size: var(--font-size-sm);
    }
    
    .btn {
        padding: 12px 16px;
        font-size: 0.9em;
    }
    
    .upi-card {
        padding: 14px;
    }
    
    .upi-id {
        font-size: 18px;
        padding: 12px;
    }
    
    .container {
        max-width: 100%;
        margin: 0;
    }
    
    .container-fluid {
        max-width: 100%;
        margin: 0;
    }

    .payment-dialog-overlay {
        padding: 12px;
    }

    .payment-dialog-box {
        padding: 18px;
    }

    .payment-toast {
        left: 10px;
        right: 10px;
        max-width: none;
    }

    .boot-loader-chip {
        top: 6px;
        right: 6px;
        padding: 4px 7px;
        font-size: 0.68rem;
    }

    .nav-loading-shell {
        min-height: 34px;
        padding: 5px;
        font-size: 0.72rem;
    }

    .auth-page {
        padding: 12px;
    }

    .auth-card {
        padding: var(--auth-card-padding-y-mobile) var(--auth-card-padding-x-mobile);
        border-radius: var(--auth-card-radius-mobile);
    }
}

@supports (padding: max(0px)) {
    @media (max-width: 768px) {
        body {
            padding-left: max(10px, env(safe-area-inset-left));
            padding-right: max(10px, env(safe-area-inset-right));
            padding-bottom: max(10px, env(safe-area-inset-bottom));
        }
    }
}

@media (max-width: 480px) {
    .main-nav .nav-links {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .main-nav .nav-link {
        font-size: 0.92rem;
        min-height: 42px;
    }

    .app-header-actions-primary {
        grid-template-columns: 1fr;
    }

    .app-header-actions-primary .btn,
    .app-header-actions-primary a {
        text-align: center;
    }

    .quick-payment {
        padding: 20px;
    }
    
    .payment-btn {
        font-size: 12px;
        padding: 10px 14px;
    }
    
    .section {
        padding: 15px;
    }
    
    input, select, textarea {
        padding: 12px 14px;
    }

    .auth-page input,
    .auth-page textarea {
        font-size: 16px;
    }
    
    .btn {
        padding: 10px 14px;
    }
}

@media (max-width: 768px) and (orientation: portrait) {
    .main-nav .nav-links {
        grid-template-columns: repeat(3, minmax(0, 1fr));
        gap: 8px;
    }

    .main-nav .nav-link {
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: 6px;
        min-height: 76px;
        padding: 10px 8px;
        border-radius: 12px;
        text-align: center;
    }

    .main-nav .nav-link .nav-link-icon {
        font-size: 1.15rem;
    }

    .main-nav .nav-link .nav-link-label {
        font-size: 0.8rem;
        line-height: 1.2;
    }
}

@media (max-width: 360px) {
    .main-nav .nav-links {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .app-header-actions-primary {
        grid-template-columns: 1fr;
    }
}
.lesson-slot-request {
    margin-top: 8px;
    padding: 8px 10px;
    border-radius: 5px;
    font-size: 0.85em;
}

.lesson-slot-request p {
    margin: 0 0 4px;
}

.lesson-slot-pending {
    background: color-mix(in srgb, var(--warning-color) 12%, transparent);
    border: 1px solid color-mix(in srgb, var(--warning-color) 35%, transparent);
}

.lesson-slot-rejected {
    background: color-mix(in srgb, var(--danger-color) 10%, transparent);
    border: 1px solid color-mix(in srgb, var(--danger-color) 30%, transparent);
    color: var(--danger-color);
}

.lesson-slot-form > summary {
    list-style: none;
}
.lesson-slot-form > summary::-webkit-details-marker { display: none; }

/* Admin Book Slot Form */
.admin-book-slot-time {
    width: 100%;
    padding: 14px 16px;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: var(--font-size-md);
    transition: var(--transition-normal);
    background: var(--surface-0);
    color: var(--text-color);
    font-family: inherit;
}

.admin-book-slot-time:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px var(--focus-ring);
}

/* Slot Request Date/Time Pickers */
.slot-req-date,
.slot-req-time {
    width: 100%;
    padding: 14px 16px;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: var(--font-size-md);
    transition: var(--transition-normal);
    background: var(--surface-0);
    color: var(--text-color);
    font-family: inherit;
}

.slot-req-date:focus,
.slot-req-time:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px var(--focus-ring);
}

.slot-req-date:disabled,
.slot-req-time:disabled {
    background-color: var(--surface-2);
    color: var(--text-color-light);
    cursor: not-allowed;
}

/* ================================================================================================= */
/* Flatpickr Calendar Theme - Design System Integration */
/* ================================================================================================= */

.flatpickr-calendar {
    background: var(--surface-elevated);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    font-family: var(--font-family);
    color: var(--text-color);
    width: 307.875px;
}

.flatpickr-calendar.open {
    box-shadow: var(--shadow-lg);
    z-index: 99;
}

.flatpickr-months {
    background: var(--surface-elevated);
    border-bottom: 1px solid var(--border-color);
    padding: 8px 10px;
}

.flatpickr-months .flatpickr-month {
    background: transparent;
    color: var(--text-color);
    font-weight: 700;
    font-size: var(--font-size-md);
}

.flatpickr-months .flatpickr-prev-month,
.flatpickr-months .flatpickr-next-month {
    color: var(--primary-color);
    fill: var(--primary-color);
    transition: var(--transition-normal);
}

.flatpickr-months .flatpickr-prev-month:hover,
.flatpickr-months .flatpickr-next-month:hover {
    color: var(--primary-color-dark);
    fill: var(--primary-color-dark);
}

.flatpickr-months .numInputWrapper {
    width: auto;
}

.flatpickr-months .numInputWrapper input.numInput {
    background: transparent;
    color: var(--text-color);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: 6px 10px;
    font-family: inherit;
    font-size: var(--font-size-sm);
    transition: var(--transition-normal);
}

.flatpickr-months .numInputWrapper input.numInput:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px var(--focus-ring);
}

.flatpickr-months .numInputWrapper span.arrowUp::after,
.flatpickr-months .numInputWrapper span.arrowDown::after {
    border-color: var(--primary-color);
}

.flatpickr-weekdays {
    background: var(--surface-elevated);
    color: var(--text-color);
    font-weight: 700;
    font-size: 0.8em;
    border-bottom: 2px solid var(--border-color);
    padding: 6px 0;
    display: flex !important;
    justify-content: space-around;
    align-items: center;
}

.flatpickr-weekday {
    color: var(--text-color);
    font-weight: 700;
    font-size: 0.95em;
    padding: 4px 2px;
    text-align: center;
    width: calc(100% / 7);
    flex: 1;
}

.flatpickr-days {
    background: var(--surface-elevated);
    padding: 6px;
    display: flex !important;
    flex-wrap: wrap;
    gap: 3px;
    width: 100%;
}

.flatpickr-day {
    color: var(--text-color);
    border-radius: var(--radius-sm);
    transition: var(--transition-normal);
    font-weight: 600;
    line-height: 1.6;
    background: var(--surface-1);
    border: 1px solid var(--border-color);
    min-height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 4px;
    margin: 0;
    flex: 1 1 calc(14.2857% - 3px);
}

.flatpickr-day:hover {
    background: color-mix(in srgb, var(--primary-color) 25%, var(--surface-1));
    border: 1px solid var(--primary-color);
    color: var(--text-color);
    cursor: pointer;
}

.flatpickr-day.selected {
    background: var(--primary-color);
    border: 1px solid var(--primary-color);
    color: white;
    font-weight: 700;
}

.flatpickr-day.selected:hover {
    background: var(--primary-color-dark);
    border: 1px solid var(--primary-color-dark);
    color: white;
}

.flatpickr-day.today {
    border: 2px solid var(--primary-color);
    background: var(--surface-1);
    color: var(--primary-color);
    font-weight: 700;
}

.flatpickr-day.today:hover {
    background: color-mix(in srgb, var(--primary-color) 15%, var(--surface-1));
    color: var(--primary-color);
}

.flatpickr-day.disabled,
.flatpickr-day.prevMonthDay,
.flatpickr-day.nextMonthDay {
    color: var(--text-color-light);
    background: var(--surface-2);
    border: 1px solid var(--border-color);
    opacity: 0.6;
    cursor: not-allowed;
}

.flatpickr-day.disabled:hover,
.flatpickr-day.prevMonthDay:hover,
.flatpickr-day.nextMonthDay:hover {
    background: var(--surface-2);
    color: var(--text-color-light);
}

.flatpickr-day.inRange {
    background: color-mix(in srgb, var(--primary-color) 20%, var(--surface-1));
    border: 1px solid var(--primary-color);
    color: var(--text-color);
    font-weight: 500;
}

.flatpickr-time {
    background: var(--surface-1);
    border-top: 1px solid var(--border-color);
    padding: 12px;
}

.flatpickr-time .numInputWrapper input {
    background: var(--surface-0);
    color: var(--text-color);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: 6px 8px;
    font-family: inherit;
    font-size: var(--font-size-sm);
    transition: var(--transition-normal);
}

.flatpickr-time .numInputWrapper input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px var(--focus-ring);
}

.flatpickr-time .numInputWrapper span.arrowUp::after,
.flatpickr-time .numInputWrapper span.arrowDown::after {
    border-color: var(--primary-color);
}

.flatpickr-hour,
.flatpickr-minute,
.flatpickr-second {
    color: var(--text-color);
}

.flatpickr-am-pm {
    background: var(--surface-0);
    color: var(--text-color);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: 6px 10px;
    font-family: inherit;
    transition: var(--transition-normal);
}

.flatpickr-am-pm:hover {
    border-color: var(--primary-color);
}

.flatpickr-innerContainer {
    background: var(--surface-elevated);
}

.flatpickr-rContainer {
    background: var(--surface-elevated);
}

.flatpickr-rContainer .flatpickr-time {
    background: var(--surface-1);
}

/* Focus state for calendar input */
.flatpickr-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px var(--focus-ring);
}

.flatpickr-calendar .hasWeeks .dayContainer {
    border-left: 1px solid var(--border-color);
}

/* Ensure proper text rendering */
.flatpickr-calendar,
.flatpickr-calendar * {
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Ensure Flatpickr stays readable in dark mode (CDN CSS loads after shared.css in admin) */
:root[data-theme='dark'] .flatpickr-calendar {
    background: var(--surface-elevated);
    border-color: var(--border-color);
    color: var(--text-color);
}

:root[data-theme='dark'] .flatpickr-months,
:root[data-theme='dark'] .flatpickr-weekdays,
:root[data-theme='dark'] .flatpickr-days,
:root[data-theme='dark'] .flatpickr-innerContainer,
:root[data-theme='dark'] .flatpickr-rContainer {
    background: var(--surface-elevated);
    color: var(--text-color);
}

:root[data-theme='dark'] .flatpickr-current-month,
:root[data-theme='dark'] .flatpickr-current-month .flatpickr-monthDropdown-months,
:root[data-theme='dark'] .flatpickr-current-month input.cur-year,
:root[data-theme='dark'] .flatpickr-weekday,
:root[data-theme='dark'] .flatpickr-day,
:root[data-theme='dark'] .flatpickr-time .flatpickr-time-separator,
:root[data-theme='dark'] .flatpickr-time .flatpickr-am-pm,
:root[data-theme='dark'] .flatpickr-time input {
    color: var(--text-color) !important;
}

:root[data-theme='dark'] .flatpickr-day {
    background: var(--surface-1);
    border-color: var(--border-color);
}

:root[data-theme='dark'] .flatpickr-day:hover {
    background: color-mix(in srgb, var(--primary-color) 25%, var(--surface-1));
    border-color: var(--primary-color);
}

:root[data-theme='dark'] .flatpickr-day.prevMonthDay,
:root[data-theme='dark'] .flatpickr-day.nextMonthDay,
:root[data-theme='dark'] .flatpickr-day.flatpickr-disabled,
:root[data-theme='dark'] .flatpickr-day.flatpickr-disabled:hover {
    color: color-mix(in srgb, var(--text-color) 65%, transparent) !important;
    background: var(--surface-2);
    border-color: var(--border-color);
}

:root[data-theme='dark'] .flatpickr-day.today {
    color: var(--primary-color) !important;
    border-color: var(--primary-color);
}

:root[data-theme='dark'] .flatpickr-day.selected,
:root[data-theme='dark'] .flatpickr-day.startRange,
:root[data-theme='dark'] .flatpickr-day.endRange,
:root[data-theme='dark'] .flatpickr-day.selected:hover,
:root[data-theme='dark'] .flatpickr-day.startRange:hover,
:root[data-theme='dark'] .flatpickr-day.endRange:hover {
    color: var(--text-inverse) !important;
}

@media (prefers-color-scheme: dark) {
    :root:not([data-theme]) .flatpickr-day,
    :root:not([data-theme]) .flatpickr-weekday,
    :root:not([data-theme]) .flatpickr-current-month,
    :root:not([data-theme]) .flatpickr-current-month .flatpickr-monthDropdown-months,
    :root:not([data-theme]) .flatpickr-current-month input.cur-year {
        color: var(--text-color) !important;
    }
}