@tailwind base;
@tailwind components;
@tailwind utilities;

/* ═══════════════════════════════════════════════════════
   BookDash Design System — Modern SaaS Theme
   Inspired by Stripe, Linear, Notion
   ═══════════════════════════════════════════════════════ */

/* ─── Design Tokens ─── */
:root {
    /* Brand */
    --bd-cream: #e9ddc8;
    --bd-tan: #cdb38f;
    --bd-brown: #a28769;
    --bd-ink: #0e0805;

    /* Neutral Palette */
    --color-bg: #ffffff;
    --color-bg-subtle: #f9fafb;
    --color-bg-muted: #f3f4f6;
    --color-bg-elevated: #ffffff;
    --color-surface: #ffffff;
    --color-surface-hover: #f9fafb;
    --color-border: #e5e7eb;
    --color-border-subtle: #f3f4f6;
    --color-text: #111827;
    --color-text-secondary: #6b7280;
    --color-text-tertiary: #9ca3af;
    --color-text-inverse: #ffffff;

    /* Primary (warm brown — brand-aligned) */
    --color-primary: #92704f;
    --color-primary-hover: #7d5f42;
    --color-primary-light: #f5efe8;
    --color-primary-ring: rgba(146, 112, 79, 0.25);

    /* Accent (indigo for interactive elements) */
    --color-accent: #6366f1;
    --color-accent-hover: #4f46e5;
    --color-accent-light: #eef2ff;
    --color-accent-ring: rgba(99, 102, 241, 0.25);

    /* Semantic Colors */
    --color-success: #10b981;
    --color-success-light: #ecfdf5;
    --color-warning: #f59e0b;
    --color-warning-light: #fffbeb;
    --color-danger: #ef4444;
    --color-danger-light: #fef2f2;
    --color-info: #3b82f6;
    --color-info-light: #eff6ff;

    /* Spacing */
    --header-height: 64px;

    /* Shadows */
    --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08), 0 1px 2px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.08), 0 2px 4px -2px rgba(0, 0, 0, 0.04);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.04);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.08), 0 8px 10px -6px rgba(0, 0, 0, 0.04);

    /* Radii */
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-full: 9999px;

    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 200ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 300ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* ─── Dark Mode ─── */
.dark {
    --color-bg: #0f1117;
    --color-bg-subtle: #161922;
    --color-bg-muted: #1c1f2e;
    --color-bg-elevated: #1c1f2e;
    --color-surface: #1c1f2e;
    --color-surface-hover: #252836;
    --color-border: #2d3044;
    --color-border-subtle: #252836;
    --color-text: #e5e7eb;
    --color-text-secondary: #9ca3af;
    --color-text-tertiary: #6b7280;
    --color-text-inverse: #111827;

    --color-primary: #c9a77c;
    --color-primary-hover: #dbb98e;
    --color-primary-light: rgba(201, 167, 124, 0.12);
    --color-primary-ring: rgba(201, 167, 124, 0.25);

    --color-accent: #818cf8;
    --color-accent-hover: #a5b4fc;
    --color-accent-light: rgba(129, 140, 248, 0.12);

    --color-success: #34d399;
    --color-success-light: rgba(52, 211, 153, 0.12);
    --color-warning: #fbbf24;
    --color-warning-light: rgba(251, 191, 36, 0.12);
    --color-danger: #f87171;
    --color-danger-light: rgba(248, 113, 113, 0.12);
    --color-info: #60a5fa;
    --color-info-light: rgba(96, 165, 250, 0.12);

    --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.4), 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -2px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4), 0 4px 6px -4px rgba(0, 0, 0, 0.3);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.4), 0 8px 10px -6px rgba(0, 0, 0, 0.3);
}

/* ─── Base Styles ─── */
body {
    background: var(--color-bg);
    color: var(--color-text);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ─── Top Navbar Layout ─── */
.app-layout {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.top-navbar {
    position: sticky;
    top: 0;
    z-index: 40;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    backdrop-filter: blur(12px);
    background: rgba(255, 255, 255, 0.95);
}

.dark .top-navbar {
    background: rgba(15, 17, 23, 0.95);
}

.navbar-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: var(--header-height);
    padding: 0 24px;
    max-width: 1280px;
    width: 100%;
    margin: 0 auto;
}

.navbar-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    flex-shrink: 0;
}

.navbar-links {
    display: flex;
    align-items: center;
    gap: 4px;
    margin-left: 32px;
}

.navbar-link {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 6px 14px;
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    text-decoration: none;
    transition: all var(--transition-fast);
    white-space: nowrap;
}

.navbar-link:hover {
    background: var(--color-bg-muted);
    color: var(--color-text);
}

.navbar-link.active {
    background: var(--color-primary-light);
    color: var(--color-primary);
}

.navbar-right {
    display: flex;
    align-items: center;
    gap: 4px;
    margin-left: auto;
}

.navbar-mobile-btn {
    display: none;
    padding: 8px;
    border-radius: var(--radius-md);
    color: var(--color-text-secondary);
    background: none;
    border: none;
    cursor: pointer;
}

.navbar-mobile-menu {
    padding: 8px 24px 16px;
    border-top: 1px solid var(--color-border-subtle);
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.navbar-mobile-link {
    display: block;
    padding: 10px 12px;
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    text-decoration: none;
    transition: all var(--transition-fast);
}

.navbar-mobile-link:hover {
    background: var(--color-bg-muted);
    color: var(--color-text);
}

.navbar-mobile-link.active {
    background: var(--color-primary-light);
    color: var(--color-primary);
}

.app-main {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.app-main .main-content {
    flex: 1;
    width: 100%;
}

.app-main .main-content > *:not(.full-width) {
    max-width: 1280px;
    margin-left: auto;
    margin-right: auto;
    padding-left: 32px;
    padding-right: 32px;
}

/* ─── Nav Items ─── */
.nav-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px 12px;
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    transition: all var(--transition-fast);
    cursor: pointer;
    text-decoration: none;
}

.nav-item:hover {
    background: var(--color-bg-muted);
    color: var(--color-text);
}

.nav-item.active {
    background: var(--color-primary-light);
    color: var(--color-primary);
}

.nav-item .nav-icon {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
    opacity: 0.7;
}

.nav-item.active .nav-icon {
    opacity: 1;
}

.nav-section-label {
    padding: 20px 12px 6px;
    font-size: 0.6875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--color-text-tertiary);
}

/* ─── Cards ─── */
.card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xs);
    transition: box-shadow var(--transition-base), border-color var(--transition-base);
}

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

.card-header {
    padding: 20px 24px;
    border-bottom: 1px solid var(--color-border);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.card-body {
    padding: 24px;
}

/* ─── Stat Cards ─── */
.stat-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 24px;
    transition: all var(--transition-base);
}

.stat-card:hover {
    box-shadow: var(--shadow-sm);
    transform: translateY(-1px);
}

.stat-card .stat-label {
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    margin-bottom: 8px;
}

.stat-card .stat-value {
    font-size: 1.875rem;
    font-weight: 700;
    color: var(--color-text);
    letter-spacing: -0.025em;
    line-height: 1;
}

.stat-card .stat-change {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    margin-top: 8px;
    font-size: 0.8125rem;
    font-weight: 500;
}

.stat-card .stat-change.positive { color: var(--color-success); }
.stat-card .stat-change.negative { color: var(--color-danger); }

/* ─── Buttons ─── */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 8px 16px;
    font-size: 0.875rem;
    font-weight: 500;
    line-height: 1.5;
    border-radius: var(--radius-md);
    border: 1px solid transparent;
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
    text-decoration: none;
    outline: none;
}

.btn:focus-visible {
    box-shadow: 0 0 0 3px var(--color-primary-ring);
}

.btn-primary {
    background: var(--color-primary);
    color: var(--color-text-inverse);
    border-color: var(--color-primary);
}

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

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

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

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

.btn-ghost:hover {
    background: var(--color-bg-muted);
    color: var(--color-text);
}

.btn-danger {
    background: var(--color-danger);
    color: #ffffff;
    border-color: var(--color-danger);
}

.btn-danger:hover {
    background: #dc2626;
    border-color: #dc2626;
}

.btn-accent {
    background: var(--color-accent);
    color: #ffffff;
    border-color: var(--color-accent);
}

.btn-accent:hover {
    background: var(--color-accent-hover);
    border-color: var(--color-accent-hover);
}

.btn-sm {
    padding: 4px 10px;
    font-size: 0.8125rem;
}

.btn-lg {
    padding: 12px 24px;
    font-size: 0.9375rem;
}

/* ─── Form Controls ─── */
.form-label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-text);
    margin-bottom: 6px;
}

.form-input {
    display: block;
    width: 100%;
    padding: 8px 12px;
    font-size: 0.875rem;
    line-height: 1.5;
    color: var(--color-text);
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
    outline: none;
}

.form-input:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--color-primary-ring);
}

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

.form-error {
    margin-top: 4px;
    font-size: 0.8125rem;
    color: var(--color-danger);
}

/* ─── Tables ─── */
.data-table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
}

.data-table thead th {
    padding: 10px 16px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-text-tertiary);
    text-align: left;
    border-bottom: 1px solid var(--color-border);
    background: var(--color-bg-subtle);
    white-space: nowrap;
}

.data-table tbody td {
    padding: 12px 16px;
    font-size: 0.875rem;
    color: var(--color-text);
    border-bottom: 1px solid var(--color-border-subtle);
    vertical-align: middle;
}

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

.data-table tbody tr:hover {
    background: var(--color-surface-hover);
}

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

/* ─── Badges ─── */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 2px 10px;
    font-size: 0.75rem;
    font-weight: 500;
    border-radius: var(--radius-full);
    line-height: 1.5;
}

.badge-success { background: var(--color-success-light); color: var(--color-success); }
.badge-warning { background: var(--color-warning-light); color: var(--color-warning); }
.badge-danger { background: var(--color-danger-light); color: var(--color-danger); }
.badge-info { background: var(--color-info-light); color: var(--color-info); }
.badge-neutral { background: var(--color-bg-muted); color: var(--color-text-secondary); }
.badge-primary { background: var(--color-primary-light); color: var(--color-primary); }

/* ─── Toast Notifications ─── */
.toast-container {
    position: fixed;
    top: 16px;
    right: 16px;
    z-index: 100;
    display: flex;
    flex-direction: column;
    gap: 8px;
    max-width: 420px;
}

.toast {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    padding: 14px 16px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    animation: toast-in 0.35s cubic-bezier(0.21, 1.02, 0.73, 1) forwards;
    transform: translateX(100%);
    opacity: 0;
}

.toast.removing {
    animation: toast-out 0.25s cubic-bezier(0.06, 0.71, 0.55, 1) forwards;
}

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

.toast-message {
    flex: 1;
    font-size: 0.875rem;
    color: var(--color-text);
    line-height: 1.5;
}

.toast-close {
    flex-shrink: 0;
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
    color: var(--color-text-tertiary);
    cursor: pointer;
    transition: all var(--transition-fast);
    background: none;
    border: none;
}

.toast-close:hover {
    background: var(--color-bg-muted);
    color: var(--color-text);
}

@keyframes toast-in {
    from { transform: translateX(100%); opacity: 0; }
    to { transform: translateX(0); opacity: 1; }
}

@keyframes toast-out {
    from { transform: translateX(0); opacity: 1; }
    to { transform: translateX(100%); opacity: 0; }
}

/* ─── Empty States ─── */
.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 64px 24px;
    text-align: center;
}

.empty-state .empty-icon {
    width: 48px;
    height: 48px;
    color: var(--color-text-tertiary);
    margin-bottom: 16px;
    opacity: 0.5;
}

.empty-state .empty-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 4px;
}

.empty-state .empty-description {
    font-size: 0.875rem;
    color: var(--color-text-tertiary);
    margin-bottom: 20px;
    max-width: 360px;
}

/* ─── Tabs ─── */
.tabs {
    display: flex;
    gap: 2px;
    border-bottom: 1px solid var(--color-border);
}

.tab-btn {
    padding: 10px 16px;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    border: none;
    border-bottom: 2px solid transparent;
    cursor: pointer;
    transition: all var(--transition-fast);
    background: none;
    margin-bottom: -1px;
}

.tab-btn:hover {
    color: var(--color-text);
}

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

/* ─── Avatars ─── */
.avatar {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-full);
    font-weight: 600;
    background: var(--color-primary-light);
    color: var(--color-primary);
    flex-shrink: 0;
}

.avatar-sm { width: 28px; height: 28px; font-size: 0.6875rem; }
.avatar-md { width: 36px; height: 36px; font-size: 0.8125rem; }
.avatar-lg { width: 48px; height: 48px; font-size: 1rem; }

/* ─── Dropdown Menu ─── */
.dropdown-menu {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    padding: 4px;
    min-width: 200px;
}

.dropdown-item {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 12px;
    font-size: 0.875rem;
    color: var(--color-text);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: background var(--transition-fast);
    text-decoration: none;
}

.dropdown-item:hover {
    background: var(--color-bg-muted);
}

.dropdown-item.danger {
    color: var(--color-danger);
}

.dropdown-item.danger:hover {
    background: var(--color-danger-light);
}

/* ─── Scrollbar ─── */
.custom-scrollbar::-webkit-scrollbar {
    width: 6px;
}

.custom-scrollbar::-webkit-scrollbar-track {
    background: transparent;
}

.custom-scrollbar::-webkit-scrollbar-thumb {
    background: var(--color-border);
    border-radius: 3px;
}

.custom-scrollbar::-webkit-scrollbar-thumb:hover {
    background: var(--color-text-tertiary);
}

/* ─── Auth Pages ─── */
.auth-layout {
    min-height: 100vh;
    display: flex;
}

.auth-form-side {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 48px;
    background: var(--color-bg);
}

.auth-brand-side {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 48px;
    background: linear-gradient(135deg, #92704f 0%, #a28769 50%, #b59b7b 100%);
    position: relative;
    overflow: hidden;
}

.auth-brand-side::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(ellipse at 30% 40%, rgba(255,255,255,0.1) 0%, transparent 60%);
}

@media (max-width: 768px) {
    .navbar-links {
        display: none;
    }

    .navbar-mobile-btn {
        display: block;
    }

    .navbar-inner {
        padding: 0 16px;
    }

    .app-main .main-content > *:not(.full-width) {
        padding-left: 16px;
        padding-right: 16px;
    }

    .auth-layout {
        flex-direction: column;
    }

    .auth-brand-side {
        display: none;
    }

    .auth-form-side {
        padding: 24px;
    }
}

@media (min-width: 769px) {
    .navbar-mobile-btn {
        display: none !important;
    }

    .navbar-mobile-menu {
        display: none !important;
    }
}

/* ─── Page Transitions ─── */
.page-enter {
    animation: page-fade-in 0.2s ease-out forwards;
}

@keyframes page-fade-in {
    from { opacity: 0; transform: translateY(4px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ─── Progress Bar ─── */
.progress-bar {
    height: 6px;
    background: var(--color-bg-muted);
    border-radius: var(--radius-full);
    overflow: hidden;
}

.progress-bar .progress-fill {
    height: 100%;
    background: var(--color-primary);
    border-radius: var(--radius-full);
    transition: width var(--transition-slow);
}