/* Forge — Layout System v3.0
   Solo Leveling System Window aesthetic.
   Sidebar (desktop >=1024) -> hamburger (tablet 768-1023) -> bottom tabs (mobile <768)
   Page-level entrance animations. */

/* ============================================
   APP SHELL
   ============================================ */
/* App shell: sidebar is position:fixed, main-content offset via margin-left */

/* ============================================
   SIDEBAR — Desktop
   ============================================ */
.sidebar {
    background: var(--bg-secondary);
    border-right: 1px solid var(--border);
    position: fixed;
    top: 0;
    left: 0;
    width: 280px;
    height: 100dvh;
    display: flex;
    flex-direction: column;
    z-index: var(--z-sticky);
    overflow-y: auto;
    overflow-x: hidden;
}

/* Brand */
.sidebar-brand {
    padding: var(--space-5) var(--space-5) var(--space-4);
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    gap: var(--space-3);
    text-decoration: none;
    color: inherit;
}
.sidebar-brand-icon {
    width: 36px;
    height: 36px;
    background: linear-gradient(135deg, var(--accent), var(--accent-strong));
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    box-shadow: 0 0 12px var(--accent-glow);
    transition: box-shadow var(--dur-normal) var(--ease-out);
}
.sidebar-brand-icon:hover {
    box-shadow:
        0 0 24px var(--accent-glow),
        0 0 48px var(--accent-light);
}
.sidebar-brand-icon svg {
    width: 20px;
    height: 20px;
    color: white;
}
.sidebar-brand-text h2 {
    font-family: var(--font-display);
    font-size: 1.35rem;
    font-weight: 800;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    background: linear-gradient(
        135deg,
        var(--accent),
        var(--accent-strong),
        var(--accent-2)
    );
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1;
}
.sidebar-brand-text span {
    font-size: 0.7rem;
    font-weight: 500;
    color: var(--text-muted);
    letter-spacing: 0.08em;
    text-transform: uppercase;
}
.version-badge {
    font-size: 0.6rem;
    font-weight: 600;
    background: var(--accent);
    color: var(--bg-primary);
    padding: 0.1em 0.4em;
    border-radius: var(--radius-sm);
    vertical-align: middle;
    letter-spacing: 0.03em;
    -webkit-text-fill-color: var(--bg-primary);
    background-clip: padding-box;
}

/* Nav section label */
.nav-section {
    padding: var(--space-4) var(--space-5) var(--space-2);
    font-size: 0.65rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

/* Nav links */
.nav-links {
    list-style: none;
    flex: 1;
    padding: var(--space-2) 0;
}
.nav-link {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-3) var(--space-5);
    color: var(--text-secondary);
    font-size: 0.875rem;
    font-weight: 500;
    border-left: 3px solid transparent;
    transition: all var(--dur-fast) var(--ease-out);
    position: relative;
}

@keyframes nav-glow-pulse {
    0%,
    100% {
        box-shadow: 0 0 8px var(--accent-glow);
    }
    50% {
        box-shadow: 0 0 16px var(--accent-glow);
    }
}

.nav-link::after {
    content: "";
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 3px;
    height: 0;
    border-radius: 3px;
    background: var(--accent);
    box-shadow: 0 0 10px var(--accent-glow);
    transition:
        height var(--dur-fast) var(--ease-out),
        box-shadow var(--dur-fast) var(--ease-out);
}
.nav-link .nav-icon {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
    opacity: 0.7;
    transition: opacity var(--dur-fast) var(--ease-out);
}
.nav-link:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
    border-left-color: var(--border);
    box-shadow: inset 0 0 18px var(--accent-light);
}
.nav-link:hover .nav-icon {
    opacity: 1;
}
.nav-link:hover::after {
    height: 45%;
    animation: nav-glow-pulse 1.4s ease-in-out infinite;
}

.nav-link.active {
    color: var(--accent-hover);
    background: var(--accent-light);
    border-left-color: var(--accent);
    font-weight: 600;
    box-shadow:
        inset 0 0 26px var(--accent-light),
        0 0 14px var(--accent-glow);
}
.nav-link.active::after {
    height: 70%;
    animation: nav-glow-pulse 1.8s ease-in-out infinite;
}
.nav-link.active .nav-icon {
    opacity: 1;
    color: var(--accent);
    filter: drop-shadow(0 0 4px var(--accent-glow));
}

/* Nav divider */
.nav-divider {
    height: 1px;
    background: var(--border);
    margin: var(--space-2) var(--space-5);
}

/* Sidebar footer */
.sidebar-footer {
    padding: var(--space-4) var(--space-5);
    border-top: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}

.sidebar-signout-form {
    margin-top: 0.45rem;
}

.sidebar-version {
    font-size: 0.7rem;
    text-align: center;
    letter-spacing: 0.05em;
    opacity: 0.5;
}

/* Theme selector */
.theme-select-wrap {
    display: flex;
    flex-direction: column;
    gap: var(--space-1);
}

.theme-select-label {
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--text-muted);
}

.theme-toggle {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: var(--space-2) var(--space-3);
    color: var(--text-secondary);
    width: 100%;
    font-size: 0.8rem;
    font-family: var(--font-sans);
    font-weight: 500;
    transition: all var(--dur-fast) var(--ease-out);
}

.theme-toggle:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
    border-color: var(--accent);
}

.theme-toggle:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 2px var(--accent-light);
}

.theme-selector {
    cursor: pointer;
    appearance: none;
    -webkit-appearance: none;
    -moz-appearance: none;
    padding-right: 2rem;
    background-image:
        linear-gradient(45deg, transparent 50%, var(--text-muted) 50%),
        linear-gradient(135deg, var(--text-muted) 50%, transparent 50%);
    background-position:
        calc(100% - 14px) calc(50% - 2px),
        calc(100% - 9px) calc(50% - 2px);
    background-size: 5px 5px, 5px 5px;
    background-repeat: no-repeat;
}

/* ============================================
   MAIN CONTENT
   ============================================ */
.main-content {
    margin-left: 280px;
    padding: var(--space-6) var(--space-6) var(--space-7);
    max-width: none;
    width: calc(100% - 280px);
    min-width: 0;
    min-height: 100dvh;
    box-sizing: border-box;
}

/* Page header with underline accent */
.page-header {
    margin-bottom: var(--space-6);
    animation: fadeInUp var(--dur-slow) var(--ease-out) both;
}
.page-header h1 {
    font-size: 2rem;
    font-weight: 800;
    margin-bottom: var(--space-1);
    position: relative;
    display: inline-block;
    text-shadow: 0 0 30px var(--accent-glow);
}
.page-header h1::after {
    content: "";
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 60px;
    height: 2px;
    background: linear-gradient(90deg, var(--accent), transparent);
    border-radius: 2px;
}
.page-header p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-top: var(--space-2);
}

/* Card staggered entrance animation */
.main-content .card {
    animation: system-arise var(--dur-slow) var(--ease-out) both;
}
.main-content .card:nth-child(1) {
    animation-delay: 0ms;
}
.main-content .card:nth-child(2) {
    animation-delay: 60ms;
}
.main-content .card:nth-child(3) {
    animation-delay: 120ms;
}
.main-content .card:nth-child(4) {
    animation-delay: 180ms;
}
.main-content .card:nth-child(5) {
    animation-delay: 240ms;
}
.main-content .card:nth-child(6) {
    animation-delay: 300ms;
}

/* ============================================
   GRID UTILITIES
   ============================================ */
.grid {
    display: grid;
    gap: var(--space-5);
}
.grid > * {
    min-width: 0;
}
.grid-2 {
    grid-template-columns: repeat(2, 1fr);
}
.grid-3 {
    grid-template-columns: repeat(3, 1fr);
}
.grid-4 {
    grid-template-columns: repeat(4, 1fr);
}

/* ============================================
   MOBILE NAV TOGGLE (hamburger)
   ============================================ */
.mobile-nav-toggle {
    display: none;
    position: fixed;
    top: var(--space-4);
    left: var(--space-4);
    z-index: var(--z-overlay);
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: var(--space-2) var(--space-3);
    cursor: pointer;
    color: var(--text-primary);
    width: 44px;
    height: 44px;
    align-items: center;
    justify-content: center;
}
.mobile-nav-toggle svg {
    width: 20px;
    height: 20px;
}

/* Sidebar overlay */
.sidebar-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: var(--overlay-soft);
    z-index: calc(var(--z-sticky) - 1);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    opacity: 0;
    transition: opacity var(--dur-normal) var(--ease-out);
}
.sidebar-overlay.visible {
    display: block;
    opacity: 1;
}

/* ============================================
   TABLET (768-1023px)
   ============================================ */
@media (max-width: 1023px) {
    /* Sidebar hidden — main-content takes full width */
    .sidebar {
        transform: translateX(-100%);
        transition: transform var(--dur-normal) var(--ease-out);
        box-shadow: none;
    }
    .sidebar.open {
        transform: translateX(0);
        box-shadow: var(--shadow-lg);
    }
    .mobile-nav-toggle {
        display: flex;
    }
    .main-content {
        margin-left: 0;
        width: 100%;
        padding: var(--space-5);
        padding-top: calc(var(--space-8) + var(--space-2));
    }
    .grid-3 {
        grid-template-columns: repeat(2, 1fr);
    }
    .grid-4 {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* ============================================
   MOBILE (<768px)
   ============================================ */
@media (max-width: 767px) {
    .sidebar {
        display: none;
    }
    .mobile-nav-toggle {
        display: none;
    }
    .main-content {
        padding: var(--space-4);
        padding-top: var(--space-4);
        padding-bottom: calc(var(--space-8) + var(--space-5));
    }
    .grid-2,
    .grid-3,
    .grid-4 {
        grid-template-columns: 1fr;
    }
    .page-header h1 {
        font-size: 1.5rem;
    }

    /* Bottom tab nav */
    .mobile-bottom-nav {
        display: flex;
        position: fixed;
        bottom: 0;
        left: 0;
        right: 0;
        background: var(--bg-secondary);
        border-top: 1px solid var(--border);
        z-index: var(--z-sticky);
        padding: var(--space-1) 0;
        padding-bottom: max(var(--space-1), env(safe-area-inset-bottom));
        justify-content: space-around;
        backdrop-filter: blur(12px);
        -webkit-backdrop-filter: blur(12px);
    }
    .mobile-bottom-nav a {
        display: flex;
        flex-direction: column;
        align-items: center;
        padding: var(--space-2) var(--space-1);
        font-size: 0.6rem;
        font-weight: 500;
        color: var(--text-muted);
        gap: 2px;
        min-width: 44px;
        min-height: 44px;
        justify-content: center;
        transition:
            color var(--dur-fast) var(--ease-out),
            background-color var(--dur-fast) var(--ease-out);
        -webkit-tap-highlight-color: transparent;
        border-radius: var(--radius-sm);
        position: relative;
    }
    .mobile-bottom-nav a:active {
        transform: scale(0.92);
    }
    .mobile-bottom-nav a.active {
        color: var(--accent);
        background: var(--accent-light);
        text-shadow: 0 0 12px var(--accent-glow);
    }
    .mobile-bottom-nav a.active::before {
        content: "";
        position: absolute;
        top: 2px;
        left: 50%;
        transform: translateX(-50%);
        width: 18px;
        height: 2px;
        border-radius: 2px;
        background: var(--accent);
        box-shadow: 0 0 8px var(--accent-glow);
    }
    .mobile-bottom-nav a.active::after {
        content: "";
        position: absolute;
        bottom: 0;
        left: 20%;
        width: 60%;
        height: 2px;
        border-radius: 2px;
        background: var(--accent);
        box-shadow: 0 0 10px var(--accent-glow);
    }
    .mobile-bottom-nav .tab-icon svg {
        width: 22px;
        height: 22px;
    }
}

/* Hide bottom nav on desktop/tablet */
@media (min-width: 768px) {
    .mobile-bottom-nav {
        display: none;
    }
}

@media (prefers-reduced-motion: reduce) {
    .page-header,
    .main-content .card,
    .nav-link::after,
    .mobile-bottom-nav a.active::before,
    .mobile-bottom-nav a.active::after {
        animation: none !important;
    }

    .mobile-bottom-nav a:active {
        transform: none;
    }
}

/* ============================================
   UTILITY CLASSES
   ============================================ */
.text-secondary {
    color: var(--text-secondary);
}
.text-muted {
    color: var(--text-muted);
}
.text-accent {
    color: var(--accent);
}
.text-success {
    color: var(--success);
}
.text-warning {
    color: var(--warning);
}
.text-danger {
    color: var(--danger);
}
.font-display {
    font-family: var(--font-display);
}
.font-mono {
    font-family: var(--font-mono);
}
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}