/* ===== Morning AI Brief - Design System ===== */

/* --- Design Tokens --- */
:root {
    /* Core palette */
    --bg-root: #0a0a0b;
    --bg-surface: #111113;
    --bg-surface-raised: #18181b;
    --bg-surface-overlay: #1e1e21;
    --bg-hover: #27272a;

    /* Borders */
    --border-default: #27272a;
    --border-subtle: #1e1e21;
    --border-emphasis: #3f3f46;

    /* Text */
    --text-primary: #fafafa;
    --text-secondary: #a1a1aa;
    --text-tertiary: #71717a;
    --text-disabled: #52525b;

    /* Accent (indigo-purple) */
    --accent-primary: #6366f1;
    --accent-primary-hover: #818cf8;
    --accent-secondary: #8b5cf6;
    --accent-gradient: linear-gradient(135deg, #6366f1, #8b5cf6);

    /* Status */
    --color-success: #22c55e;
    --color-success-dim: rgba(34, 197, 94, 0.15);
    --color-warning: #f59e0b;
    --color-warning-dim: rgba(245, 158, 11, 0.15);
    --color-danger: #ef4444;
    --color-danger-dim: rgba(239, 68, 68, 0.15);
    --color-info: #3b82f6;
    --color-info-dim: rgba(59, 130, 246, 0.15);

    /* Typography */
    --font-sans: 'Pretendard Variable', 'Pretendard', -apple-system, BlinkMacSystemFont, system-ui, 'Segoe UI', sans-serif;
    --font-mono: 'JetBrains Mono', 'SF Mono', 'Fira Code', 'Cascadia Code', monospace;

    /* Sizing */
    --sidebar-width: 260px;

    /* Radius */
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-full: 999px;

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.3), 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, 0.4);
    --shadow-glow: 0 0 20px rgba(99, 102, 241, 0.15);

    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: 250ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* --- Base Styles --- */
body {
    font-family: var(--font-sans);
    background: var(--bg-root);
    color: var(--text-primary);
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

code, pre, .font-mono {
    font-family: var(--font-mono);
}

/* --- Iconify Icon Base --- */
iconify-icon {
    display: inline-flex;
    vertical-align: -0.125em;
}

/* --- Sidebar --- */
.sidebar {
    width: var(--sidebar-width);
    position: fixed;
    top: 0; bottom: 0; left: 0;
    background: var(--bg-surface);
    border-right: 1px solid var(--border-default);
    padding-top: 1rem;
    z-index: 100;
    overflow-y: auto;
    transition: transform var(--transition-normal);
}

.sidebar .brand {
    padding: 0.75rem 1.25rem 1.5rem;
    font-size: 1rem;
    font-weight: 700;
    color: var(--text-primary);
    border-bottom: 1px solid var(--border-default);
    margin-bottom: 0.5rem;
    display: flex;
    align-items: center;
    gap: 0.625rem;
    letter-spacing: -0.01em;
}

.sidebar .brand-icon {
    width: 28px;
    height: 28px;
    background: var(--accent-gradient);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.875rem;
    flex-shrink: 0;
}

.sidebar .nav-section {
    font-size: 0.6875rem;
    font-weight: 600;
    text-transform: uppercase;
    color: var(--text-tertiary);
    padding: 1.25rem 1.25rem 0.375rem;
    letter-spacing: 0.08em;
}

.sidebar .nav-link {
    color: var(--text-secondary);
    padding: 0.5rem 1.25rem;
    font-size: 0.875rem;
    font-weight: 450;
    border-radius: 0;
    border-left: 3px solid transparent;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
}

.sidebar .nav-link iconify-icon {
    width: 20px;
    margin-right: 0.625rem;
    text-align: center;
    font-size: 1.125rem;
    flex-shrink: 0;
}

.sidebar .nav-link:hover {
    color: var(--text-primary);
    background: var(--bg-hover);
}

.sidebar .nav-link.active {
    color: var(--accent-primary-hover);
    background: rgba(99, 102, 241, 0.08);
    border-left-color: var(--accent-primary);
    font-weight: 500;
}

/* --- Main Content --- */
.main-content {
    margin-left: var(--sidebar-width);
    padding: 2rem 2.5rem;
    min-height: 100vh;
    animation: fadeIn var(--transition-normal) ease-out;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(4px); }
    to { opacity: 1; transform: translateY(0); }
}

/* --- Mobile Toggle --- */
.sidebar-toggle {
    display: none;
    position: fixed;
    top: 0.75rem;
    left: 0.75rem;
    z-index: 101;
    width: 40px;
    height: 40px;
    background: var(--bg-surface-raised);
    border: 1px solid var(--border-default);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    align-items: center;
    justify-content: center;
    cursor: pointer;
    font-size: 1.25rem;
    transition: background var(--transition-fast);
}

.sidebar-toggle:hover {
    background: var(--bg-hover);
}

.sidebar-backdrop {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.6);
    z-index: 99;
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.sidebar-backdrop.active {
    display: block;
    opacity: 1;
}

/* --- Responsive --- */
@media (max-width: 768px) {
    .sidebar-toggle {
        display: flex;
    }

    .sidebar {
        transform: translateX(-100%);
    }

    .sidebar.open {
        transform: translateX(0);
    }

    .main-content {
        margin-left: 0;
        padding: 1rem;
        padding-top: 3.5rem;
    }
}

@media (max-width: 576px) {
    .main-content {
        padding: 0.75rem;
        padding-top: 3.5rem;
    }
}

/* --- Toast Container --- */
.toast-container-custom {
    position: fixed;
    bottom: 1.5rem;
    right: 1.5rem;
    z-index: 1070;
    display: flex;
    flex-direction: column-reverse;
    gap: 0.5rem;
    max-width: 380px;
}

.toast-custom {
    background: var(--bg-surface-raised);
    border: 1px solid var(--border-default);
    border-radius: var(--radius-lg);
    padding: 0.875rem 1rem;
    color: var(--text-primary);
    font-size: 0.875rem;
    box-shadow: var(--shadow-lg);
    display: flex;
    align-items: center;
    gap: 0.625rem;
    animation: toastIn var(--transition-normal) ease-out;
    transition: opacity var(--transition-fast), transform var(--transition-fast);
}

.toast-custom.hiding {
    opacity: 0;
    transform: translateX(1rem);
}

.toast-custom .toast-icon {
    flex-shrink: 0;
    font-size: 1.125rem;
}

.toast-custom .toast-message {
    flex: 1;
    line-height: 1.4;
}

.toast-custom .toast-close {
    background: none;
    border: none;
    color: var(--text-tertiary);
    cursor: pointer;
    padding: 0.25rem;
    font-size: 1rem;
    line-height: 1;
    transition: color var(--transition-fast);
}

.toast-custom .toast-close:hover {
    color: var(--text-primary);
}

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

@keyframes toastIn {
    from { opacity: 0; transform: translateY(1rem) scale(0.95); }
    to { opacity: 1; transform: translateY(0) scale(1); }
}

/* --- Scrollbar --- */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb {
    background: var(--border-emphasis);
    border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover { background: var(--text-tertiary); }

/* --- Reduced Motion --- */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        transition-duration: 0.01ms !important;
    }
}

/* --- Page Header --- */
.page-header {
    margin-bottom: 1.75rem;
}

.page-header h2 {
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: 0.25rem;
}

.page-header .page-subtitle {
    color: var(--text-secondary);
    font-size: 0.875rem;
}