/* =============================================================================
   LAYOUT — Sidebar + Main Content
   ============================================================================= */

/* =============================================================================
   1. APP LAYOUT
   ============================================================================= */

.app-body {
    display: flex;
    min-height: 100vh;
    background-color: var(--surface);
}


/* =============================================================================
   2. SIDEBAR
   ============================================================================= */

.sidebar {
    position: fixed;
    top: 0;
    left: 0;
    width: 260px;
    height: 100vh;
    background-color: var(--surface-container-low);
    display: flex;
    flex-direction: column;
    z-index: var(--z-sidebar);
    transition: width var(--duration-base) var(--ease-out);
    overflow: hidden;
}

.sidebar.collapsed {
    width: 72px;
}

.sidebar-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-4) var(--space-4);
    height: 64px;
    flex-shrink: 0;
}

.sidebar-logo {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    overflow: hidden;
}

.logo-icon {
    flex-shrink: 0;
}

.logo-text {
    font-family: var(--font-display);
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--on-surface);
    white-space: nowrap;
}

.sidebar-toggle {
    width: 32px;
    height: 32px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--on-surface-variant);
    transition: background-color var(--duration-fast) var(--ease-out);
    flex-shrink: 0;
}

.sidebar-toggle:hover {
    background-color: var(--surface-container);
}

/* Navigation */
.sidebar-nav {
    flex: 1;
    padding: var(--space-2) var(--space-3);
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
    overflow-y: auto;
    overflow-x: hidden;
}

.nav-section {
    display: flex;
    flex-direction: column;
    gap: var(--space-1);
}

.nav-section-label {
    font-family: var(--font-body);
    font-size: 0.6875rem;
    font-weight: 600;
    color: var(--on-surface-variant);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    padding: var(--space-2) var(--space-3);
    white-space: nowrap;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-2) var(--space-3);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--on-surface-variant);
    transition: all var(--duration-fast) var(--ease-out);
    white-space: nowrap;
    text-decoration: none;
}

.nav-item:hover {
    background-color: var(--surface-container);
    color: var(--on-surface);
}

.nav-item.active {
    background-color: var(--primary-fixed);
    color: var(--primary);
    font-weight: 600;
}

.nav-item svg {
    flex-shrink: 0;
}

/* Sidebar Footer */
.sidebar-footer {
    padding: var(--space-3);
    flex-shrink: 0;
}

.user-card {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-2) var(--space-3);
    border-radius: var(--radius-md);
    transition: background-color var(--duration-fast) var(--ease-out);
    text-decoration: none;
    overflow: hidden;
}

.user-card:hover {
    background-color: var(--surface-container);
}

.user-avatar {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-full);
    background: var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--on-primary);
    font-weight: 700;
    font-size: 0.875rem;
    font-family: var(--font-display);
    flex-shrink: 0;
}

.user-info {
    display: flex;
    flex-direction: column;
    min-width: 0;
    overflow: hidden;
}

.user-name {
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--on-surface);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.user-role {
    font-size: 0.6875rem;
    color: var(--on-surface-variant);
}


/* =============================================================================
   3. MAIN CONTENT
   ============================================================================= */

.main-content {
    flex: 1;
    margin-left: 260px;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    transition: margin-left var(--duration-base) var(--ease-out);
}

.main-content.sidebar-collapsed {
    margin-left: 72px;
}

/* Page content */
.page-content {
    flex: 1;
    padding: var(--space-6) var(--space-8);
    max-width: 1400px;
    width: 100%;
}


/* =============================================================================
   4. TOP NAVBAR
   ============================================================================= */

.top-navbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-4) var(--space-8);
    height: 64px;
    background-color: var(--surface);
    position: sticky;
    top: 0;
    z-index: var(--z-navbar);
    backdrop-filter: blur(var(--glass-blur));
    background-color: var(--glass-bg);
}

.navbar-left {
    display: flex;
    align-items: center;
    gap: var(--space-4);
}

.navbar-right {
    display: flex;
    align-items: center;
    gap: var(--space-4);
}

.page-title {
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--on-surface);
}


/* =============================================================================
   5. AUTH LAYOUT (Login page — no sidebar)
   ============================================================================= */

.auth-layout {
    display: flex;
    min-height: 100vh;
}

.auth-left {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-8);
    background-color: var(--surface);
}

.auth-card {
    width: 100%;
    max-width: 420px;
    background-color: var(--surface-container-lowest);
    border-radius: var(--radius-2xl);
    padding: var(--space-10);
    box-shadow: var(--shadow-ambient);
}

.auth-logo {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    margin-bottom: var(--space-8);
}

.auth-logo-text {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--on-surface);
}

.auth-title {
    font-family: var(--font-display);
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--on-surface);
    margin-bottom: var(--space-2);
}

.auth-subtitle {
    font-size: 0.9375rem;
    color: var(--on-surface-variant);
    margin-bottom: var(--space-8);
}

.auth-form {
    display: flex;
    flex-direction: column;
    gap: var(--space-5);
}

.auth-right {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--primary);
    padding: var(--space-12);
    color: var(--on-primary);
    position: relative;
    overflow: hidden;
}

.auth-right::before {
    content: '';
    position: absolute;
    width: 600px;
    height: 600px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.05);
    top: -200px;
    right: -200px;
}

.auth-right::after {
    content: '';
    position: absolute;
    width: 400px;
    height: 400px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.03);
    bottom: -100px;
    left: -100px;
}

.auth-hero {
    position: relative;
    z-index: 1;
    max-width: 480px;
}

.auth-hero-title {
    font-family: var(--font-display);
    font-size: 2.5rem;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--space-6);
}

.auth-hero-desc {
    font-size: 1.0625rem;
    opacity: 0.85;
    line-height: 1.7;
}

.auth-hero-stats {
    display: flex;
    gap: var(--space-8);
    margin-top: var(--space-10);
}

.auth-stat {
    display: flex;
    flex-direction: column;
    gap: var(--space-1);
}

.auth-stat-value {
    font-family: var(--font-display);
    font-size: 2rem;
    font-weight: 700;
}

.auth-stat-label {
    font-size: 0.875rem;
    opacity: 0.7;
}


/* =============================================================================
   6. SECTION HEADERS
   ============================================================================= */

.section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--space-6);
}

.section-title {
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--on-surface);
}

.section-subtitle {
    font-size: 0.875rem;
    color: var(--on-surface-variant);
    margin-top: var(--space-1);
}


/* =============================================================================
   7. GRID LAYOUTS
   ============================================================================= */

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-4);
    margin-bottom: var(--space-8);
}

.content-grid {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: var(--space-6);
}

.upload-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-6);
}


/* =============================================================================
   8. RESPONSIVE
   ============================================================================= */

/* ---------- Desktop ≤ 1200px ---------- */
@media (max-width: 1200px) {
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }

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

/* ---------- Tablet & Mobile ≤ 1024px ---------- */
@media (max-width: 1024px) {
    /* Sidebar: off-screen drawer */
    .sidebar {
        transform: translateX(-100%);
        width: 260px;
    }

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

    .main-content {
        margin-left: 0 !important;
    }

    /* Navbar — fixed trên mobile (sticky không ổn định trong flex parent) */
    .top-navbar {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        height: 56px;
        padding: var(--space-2) var(--space-4);
        gap: var(--space-2);
        background-color: var(--surface-container-lowest);
        backdrop-filter: none;
        border-bottom: 1px solid var(--outline-variant);
        z-index: calc(var(--z-sidebar) + 10);
    }

    /* Offset cho fixed navbar */
    .page-content {
        padding-top: calc(56px + var(--space-4));
    }

    .navbar-right {
        gap: var(--space-2);
    }

    .navbar-right .btn span {
        display: none;
    }

    .page-title {
        font-size: 1.0625rem;
    }

    /* Page content */
    .page-content {
        padding: var(--space-4);
    }

    /* Grids */
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--space-3);
    }

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

    /* Section headers: stack vertically */
    .section-header {
        flex-direction: column;
        align-items: flex-start !important;
        gap: var(--space-3);
    }

    /* Auth */
    .auth-layout {
        flex-direction: column;
    }

    .auth-right {
        display: none;
    }

    .auth-card {
        padding: var(--space-6);
    }

    .auth-hero-title {
        font-size: 1.75rem;
    }

    /* Toast */
    .toast-container {
        left: var(--space-4);
        right: var(--space-4);
        bottom: var(--space-4);
    }

    .toast {
        min-width: auto;
    }

    /* Profile form grids */
    .profile-grid-2col {
        grid-template-columns: 1fr !important;
    }

    /* Submission detail: score overview */
    .detail-score-grid {
        grid-template-columns: 1fr !important;
    }

    /* Submission detail: image grid */
    .detail-image-grid {
        grid-template-columns: 1fr !important;
    }

    /* Generic button row wrap */
    .btn-row {
        flex-wrap: wrap;
    }

    /* Display helpers */
    .display-sm {
        font-size: 1.25rem;
    }
}

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

    .page-content {
        padding: var(--space-3);
        padding-top: calc(56px + var(--space-3));
    }

    .auth-card {
        border-radius: 0;
        box-shadow: none;
    }

    .auth-left {
        padding: 0;
    }

    .auth-title {
        font-size: 1.375rem;
    }

    .stat-card {
        padding: var(--space-3);
    }
}