/* =============================================
   Backstage — Design System
   Inspiré de dirtysoundmagnet.com
   Fond sombre, accents ambre/doré, typo rock
   ============================================= */

/* Google Fonts */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Oswald:wght@400;500;600;700&display=swap');

/* -----------------------------------------------
   CSS Custom Properties (Design Tokens)
   ----------------------------------------------- */
:root {
    /* Background */
    --bg-primary: #0a0a0a;
    --bg-secondary: #141414;
    --bg-tertiary: #1e1e1e;
    --bg-card: #181818;
    --bg-hover: #252525;
    --bg-input: #1a1a1a;

    /* Accent (Ambre DSM) */
    --accent: #eaa72f;
    --accent-hover: #d4922a;
    --accent-light: #f0be5a;
    --accent-glow: rgba(234, 167, 47, 0.15);
    --accent-glow-strong: rgba(234, 167, 47, 0.3);

    /* Text */
    --text-primary: #f0f0f0;
    --text-secondary: #8a8a8a;
    --text-muted: #555;
    --text-accent: #eaa72f;

    /* Status */
    --success: #22c55e;
    --success-bg: rgba(34, 197, 94, 0.1);
    --danger: #ef4444;
    --danger-bg: rgba(239, 68, 68, 0.1);
    --warning: #f59e0b;
    --warning-bg: rgba(245, 158, 11, 0.1);
    --info: #3b82f6;
    --info-bg: rgba(59, 130, 246, 0.1);

    /* Borders */
    --border: #2a2a2a;
    --border-light: #333;
    --border-accent: rgba(234, 167, 47, 0.3);

    /* Typography */
    --font-heading: 'Oswald', sans-serif;
    --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;

    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;

    /* Border Radius */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-full: 50%;

    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.4);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.5);
    --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.6);
    --shadow-glow: 0 0 20px rgba(234, 167, 47, 0.15);

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 400ms ease;

    /* Layout */
    --sidebar-width: 260px;
    --header-height: 64px;
}

/* -----------------------------------------------
   Reset & Base
   ----------------------------------------------- */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    max-width: 100%;
    overflow-x: hidden;
}

body {
    font-family: var(--font-body);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    max-width: 100%;
    overflow-x: hidden;
}

a {
    color: var(--accent);
    text-decoration: none;
    transition: color var(--transition-fast);
}
a:hover {
    color: var(--accent-light);
}

img {
    max-width: 100%;
    height: auto;
}

/* -----------------------------------------------
   Typography
   ----------------------------------------------- */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 600;
    letter-spacing: 0.02em;
    text-transform: uppercase;
    line-height: 1.2;
    color: var(--text-primary);
}

h1 { font-size: 2rem; }
h2 { font-size: 1.5rem; }
h3 { font-size: 1.2rem; }
h4 { font-size: 1rem; }

.page-title {
    font-size: 1.75rem;
    margin-bottom: var(--space-xl);
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

.page-title .icon {
    font-size: 1.5rem;
}

.text-accent { color: var(--accent); }
.text-muted { color: var(--text-secondary); }
.text-success { color: var(--success); }
.text-danger { color: var(--danger); }

/* -----------------------------------------------
   Layout — App Shell
   ----------------------------------------------- */
.app-layout {
    display: grid;
    grid-template-columns: var(--sidebar-width) 1fr;
    grid-template-rows: var(--header-height) 1fr;
    min-height: 100vh;
}

/* Header */
.app-header {
    grid-column: 1 / -1;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--space-xl);
    position: sticky;
    top: 0;
    z-index: 100;
}

.app-header__logo {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    font-family: var(--font-heading);
    font-size: 1.4rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-primary);
}

.app-header__logo .logo-icon {
    font-size: 1.6rem;
}

.app-header__logo span {
    background: linear-gradient(135deg, var(--accent), var(--accent-light));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.app-header__right {
    display: flex;
    align-items: center;
    gap: var(--space-lg);
}

.app-header__artist {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-xs) var(--space-md);
    background: var(--accent-glow);
    border: 1px solid var(--border-accent);
    border-radius: var(--radius-sm);
    color: var(--accent);
    font-size: 0.85rem;
    font-weight: 500;
}

.app-header__user {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.app-header__user .avatar {
    width: 34px;
    height: 34px;
    background: linear-gradient(135deg, var(--accent), var(--accent-hover));
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.85rem;
    color: var(--bg-primary);
}

.btn-logout {
    background: none;
    border: none;
    color: var(--text-primary);
    cursor: pointer;
    padding: var(--space-xs);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
}

.btn-logout:hover {
    color: var(--danger);
    transform: translateX(3px);
}

/* Sidebar */
.app-sidebar {
    background: var(--bg-secondary);
    border-right: 1px solid var(--border);
    padding: var(--space-lg) 0;
    overflow-y: auto;
}

.sidebar-section {
    margin-bottom: var(--space-lg);
}

.sidebar-section__title {
    font-family: var(--font-body);
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-muted);
    padding: 0 var(--space-lg);
    margin-bottom: var(--space-sm);
}

.sidebar-nav {
    list-style: none;
}

.sidebar-nav__item {
    margin: 2px 0;
}

.sidebar-nav__link {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-sm) var(--space-lg);
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 400;
    transition: all var(--transition-fast);
    border-left: 3px solid transparent;
}

.sidebar-nav__link:hover {
    color: var(--text-primary);
    background: var(--bg-hover);
    border-left-color: var(--border-light);
}

.sidebar-nav__link.active {
    color: var(--accent);
    background: var(--accent-glow);
    border-left-color: var(--accent);
    font-weight: 500;
}

.sidebar-nav__link .nav-icon {
    font-size: 1.1rem;
    width: 24px;
    text-align: center;
}

.sidebar-nav__link--sub {
    padding-left: calc(var(--space-lg) + 36px);
    font-size: 0.85rem;
}

/* Main Content */
.app-main {
    padding: var(--space-xl);
    overflow-y: auto;
    max-width: 1400px;
}

/* Sidebar Overlay */
.sidebar-overlay {
    display: none;
}

/* -----------------------------------------------
   Cards
   ----------------------------------------------- */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: var(--space-lg);
    transition: all var(--transition-base);
}

.card:hover {
    border-color: var(--border-light);
    box-shadow: var(--shadow-md);
}

.card--accent {
    border-color: var(--border-accent);
    background: linear-gradient(135deg, var(--bg-card), rgba(234, 167, 47, 0.03));
}

.card--accent:hover {
    box-shadow: var(--shadow-glow);
}

.card__header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--space-md);
}

.card__title {
    font-size: 0.8rem;
    font-family: var(--font-body);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--text-secondary);
    font-weight: 600;
}

.card__icon {
    font-size: 1.3rem;
    color: var(--accent);
}

.card__value {
    font-family: var(--font-heading);
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--space-xs);
}

.card__subtitle {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

/* Stat Cards Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: var(--space-lg);
    margin-bottom: var(--space-xl);
}

/* -----------------------------------------------
   Tables
   ----------------------------------------------- */
.table-wrapper {
    overflow-x: auto;
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    background: var(--bg-card);
}

table {
    width: 100%;
    border-collapse: collapse;
}

thead th {
    background: var(--bg-tertiary);
    padding: var(--space-md) var(--space-lg);
    text-align: left;
    font-family: var(--font-body);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--text-secondary);
    border-bottom: 1px solid var(--border);
    white-space: nowrap;
}

tbody td {
    padding: var(--space-md) var(--space-lg);
    border-bottom: 1px solid var(--border);
    font-size: 0.9rem;
    vertical-align: middle;
}

tbody tr {
    transition: background var(--transition-fast);
}

tbody tr:hover {
    background: var(--bg-hover);
}

tbody tr:last-child td {
    border-bottom: none;
}

/* Table totals row */
tfoot td {
    padding: var(--space-md) var(--space-lg);
    font-weight: 700;
    font-family: var(--font-heading);
    font-size: 1rem;
    background: var(--accent-glow);
    color: var(--accent);
    border-top: 2px solid var(--accent);
    vertical-align: middle;
}

.td-amount {
    font-family: var(--font-heading);
    font-weight: 600;
    font-size: 1rem;
    white-space: nowrap;
}

.td-amount--cash {
    color: var(--success);
}

.td-amount--card {
    color: var(--info);
}

.td-amount--total {
    color: var(--accent);
}

/* -----------------------------------------------
   Buttons
   ----------------------------------------------- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    padding: 0 var(--space-lg);
    border: 1px solid transparent;
    border-radius: var(--radius-sm);
    font-family: var(--font-body);
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
    text-decoration: none;
    white-space: nowrap;
    height: 38px;
    box-sizing: border-box;
}

.btn:active {
    transform: scale(0.97);
}

.btn--primary {
    background: linear-gradient(135deg, var(--accent), var(--accent-hover));
    color: var(--bg-primary);
    border-color: var(--accent);
}
.btn--primary:hover {
    background: linear-gradient(135deg, var(--accent-light), var(--accent));
    box-shadow: var(--shadow-glow);
    color: var(--bg-primary);
}

.btn--secondary {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border-color: var(--border);
}
.btn--secondary:hover {
    background: var(--bg-hover);
    border-color: var(--border-light);
    color: var(--text-primary);
}

.btn--danger {
    background: transparent;
    color: var(--danger);
    border-color: var(--danger);
}
.btn--danger:hover {
    background: var(--danger);
    color: white;
}

.btn--ghost {
    background: transparent;
    color: var(--text-secondary);
    border-color: transparent;
}
.btn--ghost:hover {
    color: var(--text-primary);
    background: var(--bg-hover);
}

.btn--sm {
    padding: var(--space-xs) var(--space-md);
    font-size: 0.8rem;
}

.btn--lg {
    padding: var(--space-md) var(--space-xl);
    font-size: 1rem;
}

.btn-group {
    display: flex;
    gap: var(--space-sm);
    flex-wrap: wrap;
}

/* -----------------------------------------------
   Forms
   ----------------------------------------------- */
.form-group {
    margin-bottom: var(--space-lg);
}

.form-label {
    display: block;
    font-size: 0.8rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
    margin-bottom: var(--space-sm);
}

.form-input,
.form-select,
.form-textarea {
    width: 100%;
    padding: var(--space-md);
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-family: var(--font-body);
    font-size: 16px;
    transition: all var(--transition-fast);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

.form-input::placeholder {
    color: var(--text-muted);
}

.form-select {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%238a8a8a' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    padding-right: 36px;
}

.form-textarea {
    min-height: 100px;
    resize: vertical;
}

.form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--space-lg);
}

.form-inline {
    display: flex;
    align-items: end;
    gap: var(--space-md);
    flex-wrap: wrap;
}

.form-inline .form-group {
    margin-bottom: 0;
    flex: 1;
    min-width: 150px;
}

/* -----------------------------------------------
   Flash Messages (Notifications)
   ----------------------------------------------- */
.flash {
    padding: var(--space-md) var(--space-lg);
    border-radius: var(--radius-sm);
    margin-bottom: var(--space-lg);
    display: flex;
    align-items: center;
    gap: var(--space-md);
    font-size: 0.9rem;
    animation: flashSlideIn 0.3s ease;
}

@keyframes flashSlideIn {
    from { opacity: 0; transform: translateY(-10px); }
    to { opacity: 1; transform: translateY(0); }
}

.flash--success {
    background: var(--success-bg);
    border: 1px solid var(--success);
    color: var(--success);
}

.flash--error {
    background: var(--danger-bg);
    border: 1px solid var(--danger);
    color: var(--danger);
}

.flash__close {
    margin-left: auto;
    background: none;
    border: none;
    color: inherit;
    cursor: pointer;
    font-size: 1.2rem;
    opacity: 0.7;
    transition: opacity var(--transition-fast);
}
.flash__close:hover {
    opacity: 1;
}

/* -----------------------------------------------
   Badges / Tags
   ----------------------------------------------- */
.badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    white-space: nowrap;
    padding: 2px 10px;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.badge--cash {
    background: var(--success-bg);
    color: var(--success);
    border: 1px solid rgba(34, 197, 94, 0.3);
}

.badge--card {
    background: var(--info-bg);
    color: var(--info);
    border: 1px solid rgba(59, 130, 246, 0.3);
}

.badge--other {
    background: var(--warning-bg);
    color: var(--warning);
    border: 1px solid rgba(245, 158, 11, 0.3);
}

.badge--active {
    background: var(--success-bg);
    color: var(--success);
}

.badge--inactive {
    background: var(--danger-bg);
    color: var(--danger);
}

.badge--upcoming {
    background: var(--accent-glow);
    color: var(--accent);
    border: 1px solid var(--border-accent);
}

.badge--past {
    background: var(--bg-tertiary);
    color: var(--text-secondary);
}

/* -----------------------------------------------
   Empty State
   ----------------------------------------------- */
.empty-state {
    text-align: center;
    padding: var(--space-2xl);
    color: var(--text-muted);
}

.empty-state__icon {
    font-size: 3rem;
    margin-bottom: var(--space-md);
    opacity: 0.5;
}

.empty-state__text {
    font-size: 1rem;
    margin-bottom: var(--space-lg);
}

/* -----------------------------------------------
   Login Page
   ----------------------------------------------- */
.login-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-primary);
    background-image: 
        radial-gradient(ellipse at 20% 50%, rgba(234, 167, 47, 0.08) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 20%, rgba(234, 167, 47, 0.05) 0%, transparent 40%);
}

.login-card {
    width: 100%;
    max-width: 420px;
    padding: var(--space-2xl);
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
}

.login-card__logo {
    text-align: center;
    margin-bottom: var(--space-xl);
}

.login-card__logo h1 {
    font-family: var(--font-heading);
    font-size: 2.2rem;
    background: linear-gradient(135deg, var(--accent), var(--accent-light));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--space-xs);
}

.login-card__logo p {
    color: var(--text-secondary);
    font-size: 0.85rem;
}

.login-card .btn--primary {
    width: 100%;
    justify-content: center;
    padding: var(--space-md);
    font-size: 0.95rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* -----------------------------------------------
   Modal / Dialog
   ----------------------------------------------- */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(4px);
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
}

.modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.modal {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    max-width: 500px;
    width: 90%;
    transform: scale(0.95) translateY(10px);
    transition: transform var(--transition-base);
    box-shadow: var(--shadow-lg);
}

.modal-overlay.active .modal {
    transform: scale(1) translateY(0);
}

.modal__title {
    font-size: 1.2rem;
    margin-bottom: var(--space-md);
}

.modal__body {
    color: var(--text-secondary);
    margin-bottom: var(--space-lg);
}

.modal__actions {
    display: flex;
    gap: var(--space-md);
    justify-content: flex-end;
}

/* -----------------------------------------------
   Page header with actions
   ----------------------------------------------- */
.page-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--space-xl);
    flex-wrap: wrap;
    gap: var(--space-md);
}

.page-header__title {
    font-size: 1.75rem;
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

/* -----------------------------------------------
   Section divider
   ----------------------------------------------- */
.section {
    margin-bottom: var(--space-xl);
}

.section__header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--space-lg);
}

.section__title {
    font-size: 1.1rem;
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

/* -----------------------------------------------
   Toast Notifications
   ----------------------------------------------- */
.toast-container {
    position: fixed;
    bottom: var(--space-xl);
    right: var(--space-xl);
    z-index: 2000;
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.toast {
    padding: var(--space-md) var(--space-lg);
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    box-shadow: var(--shadow-md);
    font-size: 0.85rem;
    animation: toastIn 0.3s ease;
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

.toast--success { border-left: 3px solid var(--success); }
.toast--error { border-left: 3px solid var(--danger); }

@keyframes toastIn {
    from { opacity: 0; transform: translateX(20px); }
    to { opacity: 1; transform: translateX(0); }
}

/* -----------------------------------------------
   Utility classes
   ----------------------------------------------- */
.flex { display: flex; }
.flex-center { display: flex; align-items: center; justify-content: center; }
.flex-between { display: flex; align-items: center; justify-content: space-between; }
.gap-sm { gap: var(--space-sm); }
.gap-md { gap: var(--space-md); }
.gap-lg { gap: var(--space-lg); }
.mt-sm { margin-top: var(--space-sm); }
.mt-md { margin-top: var(--space-md); }
.mt-lg { margin-top: var(--space-lg); }
.mb-sm { margin-bottom: var(--space-sm); }
.mb-md { margin-bottom: var(--space-md); }
.mb-lg { margin-bottom: var(--space-lg); }
.text-right { text-align: right; }
.text-center { text-align: center; }
.w-full { width: 100%; }
.hidden { display: none; }

/* -----------------------------------------------
   Responsive
   ----------------------------------------------- */
.mobile-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 1.5rem;
    cursor: pointer;
    padding: var(--space-sm);
}

@media (max-width: 768px) {
    .app-layout {
        grid-template-columns: 1fr;
    }

    .app-sidebar {
        position: fixed;
        left: -100%;
        top: var(--header-height);
        bottom: 0;
        width: var(--sidebar-width);
        z-index: 90;
        transition: left var(--transition-base);
    }

    .app-sidebar.open {
        left: 0;
    }

    .sidebar-overlay {
        display: none;
        position: fixed;
        inset: 0;
        top: var(--header-height);
        background: rgba(0, 0, 0, 0.5);
        z-index: 80;
    }

    .sidebar-overlay.open {
        display: block;
    }

    .mobile-toggle {
        display: block;
    }

    .app-main {
        padding: var(--space-md);
    }

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

    .form-row {
        grid-template-columns: 1fr;
    }

    .page-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .app-header__artist {
        display: none;
    }
}

@media (max-width: 480px) {
    .stats-grid {
        grid-template-columns: 1fr;
    }

    .btn-group {
        flex-direction: column;
    }

    .btn-group .btn {
        width: 100%;
        justify-content: center;
    }
}

/* -----------------------------------------------
   Animations
   ----------------------------------------------- */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes slideUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.animate-fade-in {
    animation: fadeIn 0.4s ease;
}

.animate-slide-up {
    animation: slideUp 0.4s ease;
}

/* Staggered card animations */
.stats-grid .card:nth-child(1) { animation: slideUp 0.4s ease 0.0s both; }
.stats-grid .card:nth-child(2) { animation: slideUp 0.4s ease 0.1s both; }
.stats-grid .card:nth-child(3) { animation: slideUp 0.4s ease 0.2s both; }
.stats-grid .card:nth-child(4) { animation: slideUp 0.4s ease 0.3s both; }

/* -----------------------------------------------
   Scrollbar
   ----------------------------------------------- */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

/* -----------------------------------------------
   Print styles
   ----------------------------------------------- */
@media print {
    .app-sidebar,
    .app-header,
    .btn,
    .mobile-toggle {
        display: none !important;
    }

    .app-layout {
        grid-template-columns: 1fr;
        grid-template-rows: 1fr;
    }

    .app-main {
        padding: 0;
    }

    body {
        background: white;
        color: black;
    }

    .card {
        border-color: #ddd;
        break-inside: avoid;
    }
}

/* =============================================
   Backstage Improvements — Custom Extensions
   ============================================= */

/* 1. Tabs Layout */
.tabs {
    display: flex;
    border-bottom: 2px solid var(--border);
    gap: var(--space-xs);
    overflow-x: auto;
    margin-bottom: var(--space-lg);
    -ms-overflow-style: none;  /* IE and Edge */
    scrollbar-width: none;  /* Firefox */
}

.tabs::-webkit-scrollbar {
    display: none; /* Chrome, Safari and Opera */
}

.tab-btn {
    background: none;
    border: none;
    color: var(--text-secondary);
    padding: var(--space-sm) var(--space-lg);
    font-family: var(--font-heading);
    font-size: 1rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    cursor: pointer;
    transition: all var(--transition-fast);
    border-bottom: 3px solid transparent;
    margin-bottom: -2px;
    white-space: nowrap;
}

@media (max-width: 600px) {
    .tab-btn {
        flex: 1;
        text-align: center;
        font-size: 0.85rem;
        padding: var(--space-sm) var(--space-xs);
        white-space: normal;
        line-height: 1.2;
    }
}

.tab-btn:hover {
    color: var(--text-primary);
    border-bottom-color: var(--border-light);
}

.tab-btn.active {
    color: var(--accent);
    border-bottom-color: var(--accent);
    font-weight: 600;
}

.tab-content {
    animation: fadeIn var(--transition-base);
}

/* 2. Convertible Currency Hover/Indications */
.convertible-currency {
    position: relative;
    transition: all var(--transition-fast);
    border-bottom: 1px dotted var(--border-accent);
    display: inline-block;
    padding-bottom: 1px;
    white-space: nowrap;
}

td.convertible-currency,
th.convertible-currency {
    display: table-cell;
}

.convertible-currency:hover {
    color: var(--accent-light) !important;
    background-color: rgba(234, 167, 47, 0.06);
    border-bottom-style: solid;
    border-bottom-color: var(--accent-light);
    border-radius: var(--radius-sm);
}

.currency-equivalent {
    display: block;
    font-size: 0.65em;
    color: var(--text-secondary);
    font-weight: normal;
    margin-top: 2px;
}

.convertible-currency.converted {
    border-bottom-color: var(--success);
}

/* 3. Spinner Loader */
@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.spinner {
    display: inline-block;
    width: 24px;
    height: 24px;
    border: 3px solid rgba(234, 167, 47, 0.15);
    border-radius: 50%;
    border-top-color: var(--accent);
    animation: spin 0.8s linear infinite;
    vertical-align: middle;
}

/* 4. Responsive Adaptations */
@media (max-width: 768px) {
    .table-wrapper {
        position: relative;
        width: 100%;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }
    
    .table-wrapper table {
        min-width: 600px;
    }
    
    .form-inline {
        flex-direction: column;
        align-items: stretch !important;
        gap: var(--space-md);
    }
    
    .form-inline .form-group {
        width: 100%;
    }
    
    .form-inline button {
        width: 100%;
        justify-content: center;
        height: 48px !important;
    }
}

/* 5. Event View Custom Responsive Actions & Back Link */
.btn-back {
    display: inline-flex;
    align-items: center;
    color: var(--text-secondary);
    font-size: 0.85rem;
    font-weight: 500;
    margin-bottom: var(--space-md);
    transition: color var(--transition-fast), transform var(--transition-fast);
}

.btn-back:hover {
    color: var(--accent);
    transform: translateX(-3px);
}

.event-actions {
    display: flex;
    gap: var(--space-sm);
    align-items: center;
    flex-wrap: wrap;
}

.event-actions-secondary {
    display: flex;
    gap: var(--space-sm);
}

@media (max-width: 768px) {
    .page-header--event {
        flex-direction: column;
        align-items: stretch !important;
        gap: var(--space-md);
    }
    
    .event-actions {
        flex-direction: column;
        align-items: stretch;
        width: 100%;
        gap: var(--space-sm);
    }
    
    .event-action-main {
        width: 100%;
        justify-content: center;
    }
    
    .event-actions-secondary {
        display: flex;
        width: 100%;
        gap: var(--space-sm);
    }
    
    .event-actions-secondary .btn,
    .event-actions-secondary .btn--secondary,
    .event-actions-secondary .btn--danger {
        flex: 1;
        justify-content: center;
    }
}

/* 6. Refunded Sales Strikethrough style */
.sale-row--refunded {
    text-decoration: line-through;
    opacity: 0.55;
    color: var(--text-secondary);
    background-color: rgba(217, 83, 79, 0.03);
}

.sale-row--refunded td {
    border-color: rgba(255, 255, 255, 0.04) !important;
}

.sale-row--refunded .badge {
    text-decoration: none !important;
    opacity: 0.7;
}

.sale-row--refunded .convertible-currency {
    border-bottom: none !important;
}