/* ==========================================================
   Mini Project MUT — Design System & Theme Styles
   ========================================================== */

:root {
    --primary: #6366F1;
    --primary-hover: #4F46E5;
    --primary-light: rgba(99, 102, 241, 0.12);
    --secondary: #8B5CF6;
    --secondary-hover: #7C3AED;
    --accent: #06B6D4;
    --success: #22C55E;
    --warning: #F59E0B;
    --danger: #EF4444;

    /* Light Theme */
    --bg-main: #F8FAFC;
    --bg-surface: #FFFFFF;
    --bg-card: #FFFFFF;
    --bg-sidebar: #FFFFFF;
    --text-main: #0F172A;
    --text-muted: #64748B;
    --text-light: #94A3B8;
    --border-color: #E2E8F0;
    --glass-bg: rgba(255, 255, 255, 0.75);
    --glass-border: rgba(226, 232, 240, 0.8);
    --card-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
    --card-shadow-hover: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.04);
}

[data-theme="dark"] {
    --bg-main: #0B0F19;
    --bg-surface: #111827;
    --bg-card: #1E293B;
    --bg-sidebar: #111827;
    --text-main: #F1F5F9;
    --text-muted: #94A3B8;
    --text-light: #64748B;
    --border-color: #334155;
    --glass-bg: rgba(17, 24, 39, 0.8);
    --glass-border: rgba(51, 65, 85, 0.8);
    --card-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3), 0 2px 4px -2px rgba(0, 0, 0, 0.2);
    --card-shadow-hover: 0 10px 15px -3px rgba(0, 0, 0, 0.4), 0 4px 6px -4px rgba(0, 0, 0, 0.3);
}

* {
    box-sizing: border-box;
}

body {
    font-family: 'Noto Sans Thai', 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background-color: var(--bg-main);
    color: var(--text-main);
    margin: 0;
    padding: 0;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    transition: background-color 0.25s ease, color 0.25s ease;
}

/* Glassmorphism Classes */
.glass-panel {
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
}

/* Layout */
.app-wrapper {
    display: flex;
    min-height: 100vh;
    width: 100%;
}

.sidebar {
    width: 260px;
    background: var(--bg-sidebar);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
    position: sticky;
    top: 0;
    height: 100vh;
    z-index: 100;
    transition: all 0.3s ease;
}

.sidebar-brand {
    padding: 1.5rem 1.25rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    border-bottom: 1px solid var(--border-color);
}

.brand-logo-badge {
    width: 38px;
    height: 38px;
    border-radius: 10px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: #FFFFFF;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1.1rem;
    box-shadow: 0 4px 10px rgba(99, 102, 241, 0.35);
}

.brand-name {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text-main);
    letter-spacing: -0.5px;
}

.brand-badge {
    font-size: 0.65rem;
    background: var(--primary-light);
    color: var(--primary);
    padding: 0.15rem 0.4rem;
    border-radius: 6px;
    font-weight: 600;
}

.sidebar-menu {
    padding: 1rem 0.75rem;
    list-style: none;
    margin: 0;
    flex-grow: 1;
    overflow-y: auto;
}

.menu-category {
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-light);
    padding: 0.75rem 0.75rem 0.25rem;
}

.nav-link-custom {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.65rem 0.85rem;
    color: var(--text-muted);
    border-radius: 8px;
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    transition: all 0.2s ease;
    margin-bottom: 0.25rem;
}

.nav-link-custom:hover {
    color: var(--primary);
    background-color: var(--primary-light);
    transform: translateX(2px);
}

.nav-link-custom.active {
    color: #FFFFFF;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    font-weight: 600;
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.25);
}

.nav-link-custom i {
    font-size: 1.18rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: transform 0.2s ease, filter 0.2s ease;
}

.nav-link-custom:hover i {
    transform: scale(1.15);
}

.nav-link-custom.active i {
    color: #FFFFFF !important;
    filter: drop-shadow(0 1px 2px rgba(0, 0, 0, 0.25));
}

/* User Card in Sidebar */
.sidebar-user {
    padding: 1rem 1.25rem;
    border-top: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.avatar-sm {
    width: 38px;
    height: 38px;
    border-radius: 50%;
    background: linear-gradient(135deg, #6366F1, #8B5CF6);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 0.9rem;
    flex-shrink: 0;
}

.user-info-text {
    flex-grow: 1;
    overflow: hidden;
}

.user-name {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-main);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.user-role-badge {
    font-size: 0.7rem;
    color: var(--text-muted);
}

/* Content Area */
.main-content {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    min-width: 0;
    background: var(--bg-main);
}

.topbar {
    height: 64px;
    background: var(--bg-surface);
    border-bottom: 1px solid var(--border-color);
    padding: 0 1.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: sticky;
    top: 0;
    z-index: 99;
}

.page-body {
    padding: 1.5rem;
    flex-grow: 1;
}

/* Cards & UI Elements */
.card-custom {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    box-shadow: var(--card-shadow);
    transition: box-shadow 0.2s ease, transform 0.2s ease;
    overflow: hidden;
}

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

.card-header-custom {
    padding: 1rem 1.25rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: transparent;
}

.card-body-custom {
    padding: 1.25rem;
}

/* Stat Cards */
.stat-card {
    padding: 1.25rem;
    display: flex;
    align-items: center;
    gap: 1rem;
    border-radius: 12px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    box-shadow: var(--card-shadow);
}

.stat-icon {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    flex-shrink: 0;
}

.stat-icon.primary { background: var(--primary-light); color: var(--primary); }
.stat-icon.success { background: rgba(34, 197, 94, 0.12); color: var(--success); }
.stat-icon.warning { background: rgba(245, 158, 11, 0.12); color: var(--warning); }
.stat-icon.danger { background: rgba(239, 68, 68, 0.12); color: var(--danger); }
.stat-icon.accent { background: rgba(6, 182, 212, 0.12); color: var(--accent); }

.stat-val {
    font-size: 1.5rem;
    font-weight: 700;
    line-height: 1.2;
    color: var(--text-main);
}

.stat-lbl {
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* Custom Badges */
.badge-status {
    padding: 0.25rem 0.6rem;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
}

.badge-priority-urgent { background: #FEE2E2; color: #DC2626; }
.badge-priority-high { background: #FEF3C7; color: #D97706; }
.badge-priority-normal { background: #E0E7FF; color: #4338CA; }
.badge-priority-low { background: #F1F5F9; color: #475569; }

/* Custom Buttons */
.btn-primary-custom {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: #FFFFFF;
    border: none;
    padding: 0.5rem 1.1rem;
    border-radius: 8px;
    font-weight: 600;
    font-size: 0.9rem;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    transition: opacity 0.2s ease, transform 0.1s ease;
    text-decoration: none;
}

.btn-primary-custom:hover {
    opacity: 0.92;
    color: #FFFFFF;
    transform: translateY(-1px);
}

/* Tables */
.table-custom {
    width: 100%;
    border-collapse: collapse;
}

.table-custom th {
    background: var(--bg-surface);
    color: var(--text-muted);
    font-weight: 600;
    font-size: 0.78rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    padding: 0.75rem 1rem;
    border-bottom: 1px solid var(--border-color);
    text-align: left;
}

.table-custom td {
    padding: 0.85rem 1rem;
    border-bottom: 1px solid var(--border-color);
    font-size: 0.88rem;
    vertical-align: middle;
}

.table-custom tr:hover td {
    background-color: var(--primary-light);
}

/* ==========================================================
   Sidebar Backdrop (Mobile)
   ========================================================== */
.sidebar-backdrop {
    position: fixed;
    inset: 0;
    background: rgba(15, 23, 42, 0.55);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    z-index: 1040;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.25s ease, visibility 0.25s ease;
}

.sidebar-backdrop.show {
    opacity: 1;
    visibility: visible;
}

.topbar-title {
    max-width: 450px;
}

/* ==========================================================
   Mobile Task Card & UI Utilities
   ========================================================== */
.mobile-task-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1rem;
    box-shadow: var(--card-shadow);
    transition: border-color 0.2s ease, box-shadow 0.2s ease, transform 0.15s ease;
}

.mobile-task-card:hover {
    box-shadow: var(--card-shadow-hover);
    border-color: rgba(99, 102, 241, 0.35);
}

.mobile-task-card .task-meta-item {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* ==========================================================
   Responsive Breakpoints
   ========================================================== */

/* Tablet & Mobile (<= 991px) */
@media (max-width: 991px) {
    .sidebar {
        position: fixed;
        top: 0;
        left: 0;
        bottom: 0;
        width: 280px;
        max-width: 85vw;
        height: 100vh;
        transform: translateX(-100%);
        transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        z-index: 1050;
        box-shadow: 0 10px 30px rgba(0, 0, 0, 0.25);
    }

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

    .topbar {
        padding: 0 1rem;
        height: 60px;
    }

    .topbar-title {
        max-width: 280px;
        font-size: 1.05rem;
    }

    .page-body {
        padding: 1rem;
    }
}

/* Mobile Phones (<= 768px) */
@media (max-width: 768px) {
    body {
        overflow-x: hidden;
    }

    .topbar {
        height: 56px;
        padding: 0 0.85rem;
    }

    .topbar-title {
        max-width: 190px;
        font-size: 0.95rem;
    }

    .page-body {
        padding: 0.75rem 0.65rem 1.5rem;
    }

    /* Stat Cards 2x2 Grid Optimization */
    .stat-card {
        padding: 0.85rem 0.75rem;
        gap: 0.65rem;
        border-radius: 10px;
    }

    .stat-icon {
        width: 40px;
        height: 40px;
        font-size: 1.2rem;
        border-radius: 9px;
    }

    .stat-val {
        font-size: 1.3rem;
    }

    .stat-lbl {
        font-size: 0.72rem;
        white-space: nowrap;
        overflow: hidden;
        text-overflow: ellipsis;
    }

    /* Cards & Panels */
    .card-custom {
        border-radius: 10px;
    }

    .card-header-custom {
        padding: 0.75rem 0.85rem;
    }

    .card-body-custom {
        padding: 0.85rem;
    }

    /* Tables */
    .table-responsive {
        -webkit-overflow-scrolling: touch;
        margin-bottom: 0.5rem;
    }

    .table-custom th {
        padding: 0.6rem 0.75rem;
        font-size: 0.74rem;
        white-space: nowrap;
    }

    .table-custom td {
        padding: 0.7rem 0.75rem;
        font-size: 0.82rem;
        white-space: nowrap;
    }

    /* Buttons & Touch Targets */
    .btn-primary-custom {
        padding: 0.45rem 0.9rem;
        font-size: 0.85rem;
    }
}

/* Small Mobile Phones (<= 420px) */
@media (max-width: 420px) {
    .topbar-title {
        max-width: 140px;
        font-size: 0.9rem;
    }

    .page-body {
        padding: 0.6rem 0.5rem 1.25rem;
    }

    .stat-card {
        padding: 0.75rem 0.6rem;
        gap: 0.5rem;
    }

    .stat-icon {
        width: 36px;
        height: 36px;
        font-size: 1.05rem;
    }

    .stat-val {
        font-size: 1.15rem;
    }

    .stat-lbl {
        font-size: 0.68rem;
    }
}

/* App Footer */
.app-footer {
    padding: 1.15rem 1.5rem;
    border-top: 1px solid var(--border-color);
    background: var(--bg-surface);
    color: var(--text-muted);
    font-size: 0.83rem;
    text-align: center;
    margin-top: auto;
    transition: background-color 0.25s ease, border-color 0.25s ease, color 0.25s ease;
}

@media (max-width: 768px) {
    .app-footer {
        padding: 0.85rem 1rem;
        font-size: 0.76rem;
    }
}

/* ==========================================================
   3D Animated Folder Effect
   ========================================================== */
.scene {
    perspective: 1200px;
    display: inline-block;
}

.folder {
    width: 240px;
    height: 160px;
    position: relative;
    cursor: pointer;
    transform-style: preserve-3d;
    transition: transform 0.3s ease;
    margin: 0 auto;
}

.folder:hover {
    transform: translateY(-4px);
}

/* Folder Back Tab */
.folder::before {
    content: "";
    position: absolute;
    left: 0;
    top: 0;
    width: 90px;
    height: 40px;
    background: #E87800;
    border-radius: 16px 16px 0 0;
    transition: background 0.3s ease;
}

/* Papers inside folder */
.paper {
    position: absolute;
    left: 16px;
    right: 16px;
    height: 100px;
    border-radius: 12px;
    background: linear-gradient(#F9FAFB 0 20%, #D6D9DF 20% 28%, #F6F7F9 28%);
    box-shadow: 0 8px 15px rgba(0, 0, 0, 0.14);
    transition: transform 0.5s ease;
    display: flex;
    flex-direction: column;
    padding: 10px 14px;
    overflow: hidden;
    pointer-events: none;
}

.paper.one {
    top: 36px;
    z-index: 2;
}

.paper.two {
    top: 46px;
    background: #E8EAEE;
    z-index: 1;
}

.paper-line {
    height: 6px;
    background: rgba(0, 0, 0, 0.08);
    border-radius: 4px;
    margin-bottom: 6px;
}
.paper-line.short { width: 50%; }
.paper-line.medium { width: 75%; }
.paper-line.full { width: 100%; }

.paper-badge-row {
    display: flex;
    gap: 4px;
    margin-top: auto;
}
.paper-badge {
    font-size: 0.65rem;
    font-weight: 700;
    padding: 1px 6px;
    border-radius: 4px;
    color: #fff;
}
.paper-badge.pdf { background: #EF4444; }
.paper-badge.doc { background: #3B82F6; }
.paper-badge.xls { background: #10B981; }

/* Folder Back Body */
.folder .back {
    position: absolute;
    left: 0;
    bottom: 0;
    width: 100%;
    height: 132px;
    background: linear-gradient(#F59D08, #EE8700);
    border-radius: 0 18px 18px 18px;
    box-shadow: 0 18px 25px rgba(0, 0, 0, 0.2);
    z-index: 1;
}

/* Folder Front Flap */
.folder .front {
    position: absolute;
    left: 0;
    bottom: 0;
    width: 100%;
    height: 112px;
    z-index: 4;
    background: linear-gradient(#FFBD21, #F59A00);
    border-radius: 14px 14px 18px 18px;
    transform-origin: bottom center;
    transition: transform 0.55s cubic-bezier(0.2, 0.8, 0.2, 1);
    box-shadow: inset 0 8px 0 rgba(255, 255, 255, 0.2), 0 4px 12px rgba(238, 135, 0, 0.25);
    display: flex;
    align-items: center;
    justify-content: center;
}

.folder-front-label {
    background: rgba(255, 255, 255, 0.25);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    color: #FFFFFF;
    font-weight: 700;
    font-size: 0.82rem;
    padding: 0.25rem 0.75rem;
    border-radius: 50px;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
    letter-spacing: 0.5px;
    display: flex;
    align-items: center;
    gap: 0.35rem;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.15);
}

/* Hover & Active/Dragover Animation */
.folder:hover .front,
.folder.is-open .front,
#dropzoneArea:hover .folder .front,
#dropzoneArea.dragover .folder .front {
    transform: rotateX(-38deg) translateY(18px);
}

.folder:hover .paper.one,
.folder.is-open .paper.one,
#dropzoneArea:hover .folder .paper.one,
#dropzoneArea.dragover .folder .paper.one {
    transform: translateY(-42px) rotateX(8deg);
}

.folder:hover .paper.two,
.folder.is-open .paper.two,
#dropzoneArea:hover .folder .paper.two,
#dropzoneArea.dragover .folder .paper.two {
    transform: translateY(-25px);
}

/* Dark theme adaptation */
[data-theme="dark"] .folder::before {
    background: #C26200;
}
[data-theme="dark"] .folder .back {
    background: linear-gradient(#D97706, #B45309);
    box-shadow: 0 18px 25px rgba(0, 0, 0, 0.45);
}
[data-theme="dark"] .folder .front {
    background: linear-gradient(#F59E0B, #D97706);
    box-shadow: inset 0 8px 0 rgba(255, 255, 255, 0.15), 0 4px 12px rgba(0, 0, 0, 0.4);
}
[data-theme="dark"] .paper {
    background: linear-gradient(#1E293B 0 20%, #334155 20% 28%, #1E293B 28%);
    box-shadow: 0 8px 15px rgba(0, 0, 0, 0.35);
}
[data-theme="dark"] .paper.two {
    background: #0F172A;
}
[data-theme="dark"] .paper-line {
    background: rgba(255, 255, 255, 0.1);
}