/* =========================================
   1. CSS Variables & Design Tokens
   ========================================= */
:root {
    /* Colors - Vibrant Gradient Palette */
    --primary-hue: 250;
    --primary-color: hsl(var(--primary-hue), 75%, 62%);
    --primary-hover: hsl(var(--primary-hue), 75%, 55%);
    --primary-glow: hsla(var(--primary-hue), 75%, 62%, 0.45);

    --accent-color: #00d4ff;
    --accent-glow: rgba(0, 212, 255, 0.4);

    --danger-color: #ff4757;
    --danger-hover: #ff3344;
    --success-color: #2ed573;
    --warning-color: #ffa502;
    --teal-color: #00cec9;

    /* Backgrounds - Dark Theme (Default) */
    --bg-dark: #0f0c29;
    --bg-gradient: linear-gradient(135deg, #0d0a27 0%, #1a173b 50%, #151330 100%);

    /* Glassmorphism */
    --glass-bg: rgba(255, 255, 255, 0.06);
    --glass-bg-hover: rgba(255, 255, 255, 0.1);
    --glass-border: rgba(255, 255, 255, 0.12);
    --glass-shadow: 0 12px 40px 0 rgba(0, 0, 0, 0.45);
    --glass-blur: 16px;
    --modal-bg: #1c183b;

    /* Text */
    --text-main: #ffffff;
    --text-muted: rgba(255, 255, 255, 0.72);
    --text-subtle: rgba(255, 255, 255, 0.45);

    /* Spacing */
    --spacing-xs: 0.5rem;   /* 8px */
    --spacing-sm: 1rem;     /* 16px */
    --spacing-md: 1.5rem;   /* 24px */
    --spacing-lg: 2rem;     /* 32px */
    --spacing-xl: 3rem;     /* 48px */

    /* Typography: Premium cross-platform Chinese font stack */
    --font-family: 'Outfit', -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", sans-serif;
    --transition-fast: 0.18s ease;
    --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Light / High-Contrast Daytime Theme */
body.light-theme {
    --bg-dark: #f0f4f9;
    --bg-gradient: linear-gradient(135deg, #e8eef8 0%, #dbe5f3 50%, #edf2f9 100%);

    --glass-bg: rgba(255, 255, 255, 0.85);
    --glass-bg-hover: rgba(255, 255, 255, 0.96);
    --glass-border: rgba(0, 40, 100, 0.12);
    --glass-shadow: 0 12px 36px 0 rgba(16, 36, 94, 0.12);
    --glass-blur: 20px;
    --modal-bg: #ffffff;

    --text-main: #182136;
    --text-muted: #4e5d78;
    --text-subtle: #7a889b;

    --primary-color: #5c4ffc;
    --primary-hover: #4738eb;
    --primary-glow: rgba(92, 79, 252, 0.3);
    --accent-color: #0084c7;
    --accent-glow: rgba(0, 132, 199, 0.25);
}

/* =========================================
   2. Reset & Base Styles
   ========================================= */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font-family);
    background: var(--bg-dark);
    color: var(--text-main);
    min-height: 100vh;
    overflow-x: hidden;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    transition: background-color 0.4s ease, color 0.4s ease;
}

/* Scrollbar Customization */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: rgba(0, 0, 0, 0.08);
}

::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.16);
    border-radius: 4px;
}

body.light-theme ::-webkit-scrollbar-thumb {
    background: rgba(0, 0, 0, 0.18);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--primary-color);
}

/* =========================================
   3. Background Mesh Animation
   ========================================= */
.background-mesh {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: -1;
    overflow: hidden;
    background: var(--bg-gradient);
    pointer-events: none;
    transition: background 0.5s ease;
}

.mesh-1,
.mesh-2,
.mesh-3 {
    position: absolute;
    border-radius: 50%;
    filter: blur(90px);
    opacity: 0.55;
    animation: drift 22s infinite alternate ease-in-out;
}

body.light-theme .mesh-1,
body.light-theme .mesh-2,
body.light-theme .mesh-3 {
    opacity: 0.4;
    filter: blur(100px);
}

.mesh-1 {
    width: 620px;
    height: 620px;
    background: radial-gradient(circle, var(--primary-color), transparent 70%);
    top: -120px;
    left: -120px;
}

.mesh-2 {
    width: 520px;
    height: 520px;
    background: radial-gradient(circle, var(--accent-color), transparent 70%);
    bottom: -100px;
    right: -100px;
    animation-delay: -6s;
}

.mesh-3 {
    width: 440px;
    height: 440px;
    background: radial-gradient(circle, #e056fd, transparent 70%);
    top: 45%;
    left: 45%;
    transform: translate(-50%, -50%);
    animation: drift 28s infinite alternate-reverse ease-in-out;
}

@keyframes drift {
    0% {
        transform: translate(0, 0) rotate(0deg);
    }
    100% {
        transform: translate(90px, 60px) rotate(25deg);
    }
}

/* =========================================
   4. Layout Structure
   ========================================= */
.app-container {
    max-width: 1240px;
    margin: 0 auto;
    padding: var(--spacing-sm) var(--spacing-md);
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    position: relative;
    z-index: 1;
}

/* Header */
.app-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.8rem 0;
    margin-bottom: var(--spacing-sm);
    gap: var(--spacing-sm);
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.45rem;
    font-weight: 700;
    letter-spacing: -0.5px;
    user-select: none;
}

.logo-icon {
    font-size: 1.85rem;
    filter: drop-shadow(0 2px 8px var(--primary-glow));
}

.logo h1 {
    font-size: 1.35rem;
    font-weight: 700;
}

/* Navigation */
.main-nav {
    display: flex;
    gap: 6px;
    background: var(--glass-bg);
    backdrop-filter: blur(var(--glass-blur));
    -webkit-backdrop-filter: blur(var(--glass-blur));
    padding: 5px;
    border-radius: 100px;
    border: 1px solid var(--glass-border);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
}

.nav-btn {
    background: transparent;
    border: none;
    color: var(--text-muted);
    padding: 0.55rem 1.25rem;
    border-radius: 50px;
    cursor: pointer;
    font-family: inherit;
    font-size: 0.95rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 6px;
    transition: all var(--transition-normal);
}

.nav-btn .icon {
    font-size: 1.05rem;
}

.nav-btn:hover {
    color: var(--text-main);
    background: var(--glass-bg-hover);
}

.nav-btn.active {
    background: var(--primary-color);
    color: #ffffff;
    box-shadow: 0 4px 18px var(--primary-glow);
}

/* Header Quick Tools */
.header-tools {
    display: flex;
    align-items: center;
    gap: 8px;
}

.tool-btn {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    color: var(--text-muted);
    padding: 0.5rem 0.85rem;
    border-radius: 30px;
    cursor: pointer;
    font-family: inherit;
    font-size: 0.85rem;
    font-weight: 500;
    display: inline-flex;
    align-items: center;
    gap: 5px;
    transition: all var(--transition-fast);
    user-select: none;
}

.tool-btn:hover {
    color: var(--text-main);
    background: var(--glass-bg-hover);
    border-color: rgba(255, 255, 255, 0.25);
    transform: translateY(-1px);
}

.tool-btn.active {
    color: #ffffff;
    background: rgba(255, 255, 255, 0.15);
    border-color: var(--primary-color);
}

body.light-theme .tool-btn.active {
    background: rgba(92, 79, 252, 0.12);
    color: var(--primary-color);
    border-color: var(--primary-color);
}

/* Main Content Area */
.content-area {
    flex: 1;
    position: relative;
    display: flex;
    flex-direction: column;
}

.view-section {
    display: none;
    animation: fadeScale 0.35s ease-out;
    flex: 1;
}

.view-section.active {
    display: flex;
    flex-direction: column;
}

@keyframes fadeScale {
    from {
        opacity: 0;
        transform: scale(0.985);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

/* =========================================
   5. Glass Cards & Components
   ========================================= */
.glass-card {
    background: var(--glass-bg);
    backdrop-filter: blur(var(--glass-blur));
    -webkit-backdrop-filter: blur(var(--glass-blur));
    border: 1px solid var(--glass-border);
    box-shadow: var(--glass-shadow);
    border-radius: 24px;
    padding: var(--spacing-lg);
    position: relative;
    transition: border-color var(--transition-fast);
}

/* =========================================
   6. Roll Call View (Main Card)
   ========================================= */
.main-card {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    flex: 1;
    min-height: 520px;
    text-align: center;
    position: relative;
    padding: var(--spacing-xl) var(--spacing-lg);
}

/* Mode Selector Bar */
.roll-mode-bar {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: var(--spacing-lg);
    background: rgba(0, 0, 0, 0.12);
    padding: 6px 14px;
    border-radius: 50px;
    border: 1px solid var(--glass-border);
}

body.light-theme .roll-mode-bar {
    background: rgba(0, 0, 0, 0.04);
}

.mode-label {
    font-size: 0.85rem;
    color: var(--text-muted);
    font-weight: 500;
}

.mode-chips {
    display: flex;
    gap: 6px;
}

.mode-chip {
    background: transparent;
    border: 1px solid transparent;
    color: var(--text-muted);
    padding: 4px 12px;
    border-radius: 20px;
    font-family: inherit;
    font-size: 0.82rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.mode-chip:hover {
    color: var(--text-main);
    background: rgba(255, 255, 255, 0.08);
}

.mode-chip.active {
    background: var(--primary-color);
    color: #ffffff;
    box-shadow: 0 2px 10px var(--primary-glow);
}

/* Roll Display Area */
.roll-display-area {
    margin-bottom: var(--spacing-lg);
    min-height: 180px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    position: relative;
    width: 100%;
}

.status-badge {
    display: inline-block;
    padding: 0.4rem 1.1rem;
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    font-size: 0.85rem;
    margin-bottom: var(--spacing-md);
    letter-spacing: 1px;
    font-weight: 600;
    color: var(--text-muted);
    transition: all var(--transition-fast);
}

.status-badge.rolling {
    background: rgba(0, 212, 255, 0.15);
    color: var(--accent-color);
    border-color: var(--accent-color);
    animation: statusPulse 1s infinite alternate;
}

.status-badge.completed {
    background: rgba(46, 213, 115, 0.18);
    color: var(--success-color);
    border-color: var(--success-color);
}

.status-badge.failed {
    background: rgba(255, 71, 87, 0.12);
    color: var(--danger-color);
    border-color: var(--danger-color);
}

@keyframes statusPulse {
    0% { opacity: 0.7; transform: scale(0.98); }
    100% { opacity: 1; transform: scale(1.02); }
}

.result-box {
    min-height: 120px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 8px;
    width: 100%;
}

.result-box .name {
    font-size: clamp(3rem, 7vw, 5.5rem);
    font-weight: 800;
    line-height: 1.15;
    background: linear-gradient(180deg, #ffffff 10%, #dcd6f7 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    text-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
    text-align: center;
    letter-spacing: 2px;
}

body.light-theme .result-box .name {
    background: linear-gradient(180deg, #182136 20%, #4738eb 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    text-shadow: 0 6px 20px rgba(0, 0, 0, 0.08);
}

.result-box .seat {
    font-size: clamp(1.4rem, 3.5vw, 2.2rem);
    font-weight: 600;
    color: var(--accent-color);
    text-shadow: 0 0 18px var(--accent-glow);
    letter-spacing: 1px;
}

body.light-theme .result-box .seat {
    color: #0077b6;
    text-shadow: none;
}

.placeholder-text {
    font-size: clamp(1.8rem, 4vw, 2.6rem);
    color: var(--text-muted);
    font-weight: 400;
}

/* Multi-pick Grid */
.multi-roll-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 16px;
    width: 100%;
    max-width: 880px;
    margin: 0 auto;
    padding: 10px;
}

.multi-student-card {
    background: rgba(255, 255, 255, 0.07);
    border: 1px solid var(--glass-border);
    border-radius: 18px;
    padding: 18px 12px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
    transform: translateY(0);
    transition: transform var(--transition-fast), border-color var(--transition-fast);
}

body.light-theme .multi-student-card {
    background: rgba(255, 255, 255, 0.9);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.06);
}

.multi-student-card:hover {
    transform: translateY(-4px);
    border-color: var(--primary-color);
}

.multi-student-card .card-seat {
    font-size: 0.9rem;
    color: var(--accent-color);
    font-weight: 600;
}

.multi-student-card .card-name {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--text-main);
    line-height: 1.2;
}

.multi-student-card .card-count {
    font-size: 0.78rem;
    color: var(--text-muted);
    background: rgba(255, 255, 255, 0.08);
    padding: 2px 8px;
    border-radius: 10px;
}

/* Control Area & Action Button */
.control-area {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 14px;
    margin-top: 10px;
}

.action-btn {
    position: relative;
    border: none;
    background: transparent;
    padding: 0;
    cursor: pointer;
    outline: none;
    -webkit-tap-highlight-color: transparent;
    user-select: none;
}

.primary-btn .btn-text {
    display: block;
    padding: 1.15rem 3.4rem;
    background: linear-gradient(135deg, var(--primary-color), hsl(var(--primary-hue), 85%, 52%));
    color: #ffffff;
    font-size: 1.25rem;
    font-weight: 700;
    letter-spacing: 1px;
    border-radius: 100px;
    position: relative;
    z-index: 2;
    transition: transform 0.2s cubic-bezier(0.34, 1.56, 0.64, 1), box-shadow 0.2s;
    box-shadow: 0 8px 24px var(--primary-glow);
}

.primary-btn .btn-bg {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 100%;
    height: 100%;
    background: var(--primary-color);
    filter: blur(24px);
    opacity: 0.55;
    border-radius: 100px;
    z-index: 1;
    transition: opacity 0.3s;
    pointer-events: none;
}

.primary-btn:hover:not(:disabled) .btn-text {
    transform: scale(1.04);
    box-shadow: 0 12px 32px var(--primary-glow);
}

.primary-btn:hover:not(:disabled) .btn-bg {
    opacity: 0.85;
}

.primary-btn:active:not(:disabled) .btn-text {
    transform: scale(0.97);
}

.primary-btn:disabled,
.primary-btn.btn-disabled {
    cursor: not-allowed;
    opacity: 0.7;
}

.primary-btn:disabled .btn-text,
.primary-btn.btn-disabled .btn-text {
    transform: none;
    background: #555566;
    box-shadow: none;
}

/* Keyboard Hint */
.keyboard-hint {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 0.85rem;
    color: var(--text-muted);
}

kbd {
    background: rgba(255, 255, 255, 0.12);
    border: 1px solid rgba(255, 255, 255, 0.25);
    border-bottom: 2px solid rgba(255, 255, 255, 0.35);
    box-shadow: 0 2px 0 rgba(0, 0, 0, 0.25);
    padding: 2px 7px;
    border-radius: 6px;
    font-size: 0.8rem;
    font-family: inherit;
    font-weight: 700;
    color: var(--text-main);
}

body.light-theme kbd {
    background: #eef2f6;
    border-color: #cbd5e1;
    border-bottom-color: #94a3b8;
    box-shadow: 0 2px 0 rgba(0, 0, 0, 0.08);
}

.student-meta {
    margin-top: var(--spacing-lg);
    font-size: 1.15rem;
    color: var(--text-muted);
    min-height: 28px;
}

.student-meta strong {
    color: var(--accent-color);
    font-size: 1.35rem;
}

/* =========================================
   7. Fullscreen Projection Mode
   ========================================= */
body.is-fullscreen .app-container {
    max-width: 100vw;
    width: 100vw;
    height: 100vh;
    padding: 1rem 2rem;
    justify-content: center;
}

body.is-fullscreen .app-header {
    margin-bottom: 0.5rem;
}

body.is-fullscreen .main-card {
    min-height: calc(100vh - 120px);
}

body.is-fullscreen .result-box .name {
    font-size: clamp(4.5rem, 12vw, 9.5rem);
    letter-spacing: 4px;
}

body.is-fullscreen .result-box .seat {
    font-size: clamp(2rem, 5vw, 3.8rem);
}

/* =========================================
   8. Student Management View
   ========================================= */
.table-card {
    padding: 0;
    display: flex;
    flex-direction: column;
    flex: 1;
    min-height: 520px;
    overflow: hidden;
}

.card-header {
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--glass-border);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 12px;
}

.card-header h2 {
    font-size: 1.35rem;
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
}

.badge {
    background: var(--primary-color);
    color: #ffffff;
    font-size: 0.8rem;
    padding: 3px 10px;
    border-radius: 12px;
    font-weight: 700;
}

.header-actions {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.icon-btn {
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid var(--glass-border);
    color: var(--text-main);
    padding: 0.5rem 0.95rem;
    border-radius: 10px;
    cursor: pointer;
    transition: all var(--transition-fast);
    font-family: inherit;
    font-size: 0.88rem;
    font-weight: 500;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.icon-btn:hover {
    background: rgba(255, 255, 255, 0.16);
    border-color: rgba(255, 255, 255, 0.3);
    transform: translateY(-1px);
}

.icon-btn.danger {
    background: rgba(255, 71, 87, 0.16);
    border-color: rgba(255, 71, 87, 0.4);
    color: #ff9da6;
}

body.light-theme .icon-btn.danger {
    color: var(--danger-color);
}

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

/* Table Toolbar (Search & Sort) */
.table-toolbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px var(--spacing-md);
    background: rgba(0, 0, 0, 0.1);
    border-bottom: 1px solid var(--glass-border);
    gap: 12px;
    flex-wrap: wrap;
}

body.light-theme .table-toolbar {
    background: rgba(0, 0, 0, 0.03);
}

.search-box {
    display: flex;
    align-items: center;
    gap: 8px;
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    padding: 5px 14px;
    flex: 1;
    max-width: 320px;
    transition: all var(--transition-fast);
}

.search-box:focus-within {
    border-color: var(--primary-color);
    background: rgba(255, 255, 255, 0.12);
    box-shadow: 0 0 0 2px var(--primary-glow);
}

.search-input-modern {
    background: transparent;
    border: none;
    color: var(--text-main);
    font-family: inherit;
    font-size: 0.88rem;
    outline: none;
    width: 100%;
}

.search-input-modern::placeholder {
    color: var(--text-muted);
}

.sort-box {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.85rem;
    color: var(--text-muted);
}

.sort-select {
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    padding: 6px 12px;
    color: var(--text-main);
    font-family: inherit;
    font-size: 0.85rem;
    outline: none;
    cursor: pointer;
}

.sort-select option {
    background: var(--modal-bg);
    color: var(--text-main);
}

/* Modern Table */
.table-container {
    flex: 1;
    overflow-y: auto;
    position: relative;
    transition: background 0.2s ease;
}

.table-container.drag-over {
    background: rgba(92, 79, 252, 0.18);
    border: 2px dashed var(--primary-color);
}

.modern-table {
    width: 100%;
    border-collapse: collapse;
}

.modern-table th {
    background: rgba(0, 0, 0, 0.2);
    padding: 12px 16px;
    text-align: center;
    font-weight: 600;
    color: var(--text-muted);
    font-size: 0.88rem;
    position: sticky;
    top: 0;
    z-index: 2;
    border-bottom: 1px solid var(--glass-border);
}

body.light-theme .modern-table th {
    background: rgba(0, 0, 0, 0.05);
}

.modern-table td {
    padding: 12px 16px;
    border-bottom: 1px solid var(--glass-border);
    text-align: center;
    font-size: 0.92rem;
    color: var(--text-main);
}

.modern-table tr:hover td {
    background: rgba(255, 255, 255, 0.04);
}

body.light-theme .modern-table tr:hover td {
    background: rgba(0, 0, 0, 0.02);
}

.call-badge {
    display: inline-block;
    padding: 2px 10px;
    border-radius: 12px;
    font-size: 0.82rem;
    font-weight: 600;
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-main);
}

.table-ops {
    display: flex;
    justify-content: center;
    gap: 8px;
}

.btn-sm {
    padding: 4px 12px;
    border-radius: 6px;
    font-size: 0.82rem;
    font-family: inherit;
    cursor: pointer;
    border: 1px solid var(--glass-border);
    transition: all var(--transition-fast);
}

.btn-edit {
    background: rgba(0, 212, 255, 0.15);
    color: var(--accent-color);
    border-color: rgba(0, 212, 255, 0.35);
}

.btn-edit:hover {
    background: var(--accent-color);
    color: #000;
}

.btn-danger {
    background: rgba(255, 71, 87, 0.15);
    color: #ff8591;
    border-color: rgba(255, 71, 87, 0.35);
}

.btn-danger:hover {
    background: var(--danger-color);
    color: #fff;
}

.empty-state {
    text-align: center;
    padding: var(--spacing-xl) 0;
    color: var(--text-muted);
}

.empty-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
}

.empty-icon {
    font-size: 3rem;
    opacity: 0.6;
}

/* =========================================
   9. Statistics View
   ========================================= */
.stats-overview {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
}

.stat-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    border-radius: 18px;
}

.stat-icon {
    width: 52px;
    height: 52px;
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.6rem;
    flex-shrink: 0;
}

.stat-icon.purple {
    background: rgba(108, 92, 231, 0.2);
    color: #a29bfe;
}

.stat-icon.blue {
    background: rgba(9, 132, 227, 0.2);
    color: #74b9ff;
}

.stat-icon.pink {
    background: rgba(225, 112, 85, 0.2);
    color: #fab1a0;
}

.stat-icon.teal {
    background: rgba(0, 206, 201, 0.2);
    color: #55efc4;
}

.stat-info h3 {
    font-size: 0.85rem;
    color: var(--text-muted);
    font-weight: 500;
}

.stat-value {
    font-size: 1.75rem;
    font-weight: 700;
    line-height: 1.2;
}

/* Distribution Bars Card */
.distribution-card {
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
    border-radius: 18px;
}

.distribution-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
    flex-wrap: wrap;
    gap: 8px;
}

.distribution-header h3 {
    font-size: 0.95rem;
    font-weight: 600;
}

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

.distribution-bars {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    min-height: 38px;
    align-items: center;
}

.distribution-chip {
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid var(--glass-border);
    border-radius: 10px;
    padding: 6px 14px;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 0.85rem;
}

.chip-count {
    color: var(--accent-color);
    font-weight: 700;
}

.chip-students {
    color: var(--text-muted);
}

.chip-percent {
    background: rgba(255, 255, 255, 0.12);
    padding: 1px 6px;
    border-radius: 8px;
    font-size: 0.75rem;
    font-weight: 600;
}

/* Chart Card & Tabs */
.chart-card {
    flex: 1;
    min-height: 420px;
    display: flex;
    flex-direction: column;
    padding: 0;
    overflow: hidden;
}

.stats-view-switch {
    display: flex;
    background: rgba(0, 0, 0, 0.15);
    padding: 3px;
    border-radius: 8px;
    border: 1px solid var(--glass-border);
}

.sm-tab-btn {
    background: transparent;
    border: none;
    color: var(--text-muted);
    padding: 5px 14px;
    border-radius: 6px;
    cursor: pointer;
    font-family: inherit;
    font-size: 0.85rem;
    font-weight: 600;
    transition: all var(--transition-fast);
}

.sm-tab-btn.active {
    background: var(--primary-color);
    color: #ffffff;
}

.stats-grid-container {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-md);
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(210px, 1fr));
    gap: 12px;
    align-content: start;
}

.stat-item-card {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--glass-border);
    border-radius: 14px;
    padding: 14px;
    display: flex;
    flex-direction: column;
    gap: 8px;
    transition: transform 0.2s, background 0.2s;
}

.stat-item-card:hover {
    background: rgba(255, 255, 255, 0.08);
    transform: translateY(-2px);
}

.stat-item-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.85rem;
    color: var(--text-muted);
}

.stat-call-count {
    background: var(--primary-color);
    padding: 2px 9px;
    border-radius: 12px;
    font-weight: 700;
    font-size: 0.78rem;
    color: #ffffff;
}

.stat-item-body {
    text-align: center;
    padding: 4px 0;
}

.stat-name {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-main);
}

.stat-item-footer {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-align: center;
    border-top: 1px solid var(--glass-border);
    padding-top: 8px;
}

/* History List Table Container */
.stats-history-container {
    flex: 1;
    overflow-y: auto;
    padding: 0;
}

.history-table {
    width: 100%;
    border-collapse: collapse;
}

.history-table th {
    background: rgba(0, 0, 0, 0.2);
    padding: 10px 14px;
    text-align: center;
    font-weight: 600;
    color: var(--text-muted);
    font-size: 0.85rem;
    position: sticky;
    top: 0;
    border-bottom: 1px solid var(--glass-border);
}

.history-table td {
    padding: 10px 14px;
    border-bottom: 1px solid var(--glass-border);
    text-align: center;
    font-size: 0.88rem;
}

.sm-btn {
    background: transparent;
    border: 1px solid var(--glass-border);
    color: var(--text-muted);
    padding: 5px 12px;
    border-radius: 8px;
    cursor: pointer;
    font-family: inherit;
    font-size: 0.82rem;
    font-weight: 500;
    transition: all var(--transition-fast);
}

.sm-btn:hover {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-main);
}

.danger-text {
    color: var(--danger-color);
    border-color: rgba(255, 71, 87, 0.35);
}

.danger-text:hover {
    background: var(--danger-color);
    color: #ffffff;
}

.search-input {
    padding: 6px 14px;
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    color: var(--text-main);
    font-family: inherit;
    font-size: 0.82rem;
    outline: none;
    width: 170px;
    transition: all var(--transition-fast);
}

.search-input:focus {
    background: rgba(255, 255, 255, 0.12);
    border-color: var(--primary-color);
    width: 210px;
}

/* =========================================
   10. Modals & Dialogs
   ========================================= */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.65);
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
    z-index: 10000;
    display: none;
    justify-content: center;
    align-items: center;
}

.glass-modal {
    background: var(--modal-bg);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    padding: var(--spacing-lg);
    width: 90%;
    max-width: 420px;
    box-shadow: 0 24px 60px rgba(0, 0, 0, 0.6);
    transform: scale(0.92);
    opacity: 0;
    transition: transform 0.25s cubic-bezier(0.34, 1.56, 0.64, 1), opacity 0.25s ease;
}

.modal-overlay.active {
    display: flex;
}

.modal-overlay.active .glass-modal {
    transform: scale(1);
    opacity: 1;
}

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

.modal-header h3 {
    font-size: 1.25rem;
    font-weight: 700;
}

.close-modal {
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 1.6rem;
    cursor: pointer;
    line-height: 1;
    padding: 4px;
    border-radius: 6px;
    transition: color var(--transition-fast);
}

.close-modal:hover {
    color: var(--text-main);
}

.form-group {
    margin-bottom: var(--spacing-md);
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-muted);
    font-size: 0.88rem;
    font-weight: 500;
}

.form-group input {
    width: 100%;
    padding: 0.85rem 1rem;
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid var(--glass-border);
    border-radius: 10px;
    color: var(--text-main);
    font-family: inherit;
    font-size: 0.95rem;
    outline: none;
    transition: all var(--transition-fast);
}

body.light-theme .form-group input {
    background: rgba(0, 0, 0, 0.03);
    border-color: rgba(0, 0, 0, 0.15);
}

.form-group input:focus {
    border-color: var(--primary-color);
    background: rgba(255, 255, 255, 0.1);
    box-shadow: 0 0 0 3px var(--primary-glow);
}

.full-width {
    width: 100%;
}

/* Dynamic Confirm Modal */
.confirm-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.65);
    backdrop-filter: blur(6px);
    z-index: 10000;
    display: flex;
    justify-content: center;
    align-items: center;
}

.confirm-content {
    background: var(--modal-bg);
    color: var(--text-main);
    padding: 26px;
    border-radius: 18px;
    max-width: 440px;
    width: 90%;
    border: 1px solid var(--glass-border);
    box-shadow: 0 24px 60px rgba(0, 0, 0, 0.6);
}

.confirm-content h3 {
    font-size: 1.25rem;
    margin-bottom: 12px;
}

.confirm-message {
    color: var(--text-muted);
    font-size: 0.92rem;
    line-height: 1.6;
}

.confirm-issues {
    margin: 10px 0 10px 20px;
    color: var(--text-muted);
}

.confirm-alert {
    margin-top: 10px;
    color: var(--danger-color);
    font-weight: 600;
}

.confirm-student {
    margin-top: 10px;
    padding: 10px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 8px;
}

.modal-buttons {
    display: flex;
    justify-content: flex-end;
    gap: 10px;
    margin-top: 24px;
}

.btn {
    padding: 8px 18px;
    border-radius: 10px;
    border: none;
    cursor: pointer;
    font-family: inherit;
    font-weight: 600;
    font-size: 0.9rem;
    transition: all var(--transition-fast);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.12);
    color: var(--text-main);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.2);
}

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

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

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

.btn-danger:hover {
    background: var(--danger-hover);
}

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

/* =========================================
   11. Toast Notifications & Loading
   ========================================= */
.toast {
    position: fixed;
    top: 24px;
    left: 50%;
    transform: translateX(-50%) translateY(-24px);
    background: rgba(25, 20, 50, 0.95);
    backdrop-filter: blur(12px);
    padding: 12px 26px;
    border-radius: 50px;
    box-shadow: 0 12px 36px rgba(0, 0, 0, 0.35);
    font-weight: 600;
    font-size: 0.92rem;
    opacity: 0;
    transition: all 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
    z-index: 99999;
    color: #ffffff;
    border: 1px solid var(--glass-border);
}

body.light-theme .toast {
    background: rgba(255, 255, 255, 0.98);
    color: #1a202c;
    box-shadow: 0 12px 30px rgba(0, 0, 0, 0.12);
}

.toast.show {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
}

.toast-success {
    color: var(--success-color);
    border-color: rgba(46, 213, 115, 0.4);
}

.toast-error {
    color: var(--danger-color);
    border-color: rgba(255, 71, 87, 0.4);
}

.toast-info {
    color: #74b9ff;
    border-color: rgba(116, 185, 255, 0.4);
}

/* Loading Overlay */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(5px);
    z-index: 10001;
    display: flex;
    justify-content: center;
    align-items: center;
}

.loading-content {
    background: var(--modal-bg);
    padding: 30px 40px;
    border-radius: 18px;
    border: 1px solid var(--glass-border);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5);
}

.loading-spinner {
    width: 44px;
    height: 44px;
    border: 3px solid rgba(255, 255, 255, 0.1);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* =========================================
   12. Animations & Particles
   ========================================= */
.rolling-fast {
    animation: shake 0.08s infinite;
}

@keyframes shake {
    0% { transform: translate(1px, 1px) rotate(0deg); }
    25% { transform: translate(-2px, -1px) rotate(-1deg); }
    50% { transform: translate(2px, 1px) rotate(1deg); }
    75% { transform: translate(-1px, 2px) rotate(0deg); }
    100% { transform: translate(1px, -2px) rotate(-1deg); }
}

.flip-in {
    animation: flipIn 0.65s cubic-bezier(0.23, 1, 0.32, 1);
}

@keyframes flipIn {
    0% {
        transform: rotateX(-90deg) scale(0.6);
        opacity: 0;
    }
    70% {
        transform: rotateX(15deg) scale(1.08);
        opacity: 0.9;
    }
    100% {
        transform: rotateX(0deg) scale(1);
        opacity: 1;
    }
}

.particle {
    position: absolute;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    pointer-events: none;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    animation: explode 0.9s forwards ease-out;
    box-shadow: 0 0 12px currentColor;
    z-index: 10;
}

@keyframes explode {
    0% {
        transform: translate(-50%, -50%) scale(1.2);
        opacity: 1;
    }
    100% {
        transform: translate(calc(-50% + var(--tx)), calc(-50% + var(--ty))) scale(0);
        opacity: 0;
    }
}

.fade-in {
    opacity: 0;
    animation: fadeIn 0.4s forwards ease-out;
}

@keyframes fadeIn {
    to { opacity: 1; }
}

/* =========================================
   13. Responsive Styles
   ========================================= */
@media (max-width: 900px) {
    .app-header {
        flex-wrap: wrap;
    }
    .header-tools {
        order: 3;
        width: 100%;
        justify-content: center;
        margin-top: 4px;
    }
}

@media (max-width: 768px) {
    .app-container {
        padding: 8px;
    }

    .app-header {
        flex-direction: column;
        gap: 10px;
    }

    .logo h1 {
        font-size: 1.2rem;
    }

    .main-nav {
        width: 100%;
        justify-content: space-around;
    }

    .nav-btn {
        padding: 0.5rem 0.8rem;
        font-size: 0.88rem;
    }

    .header-tools {
        flex-wrap: wrap;
        gap: 6px;
    }

    .tool-btn {
        padding: 0.4rem 0.65rem;
        font-size: 0.78rem;
    }

    .main-card {
        min-height: 420px;
        padding: var(--spacing-md) var(--spacing-sm);
    }

    .roll-mode-bar {
        flex-direction: column;
        gap: 6px;
        border-radius: 16px;
        padding: 8px;
    }

    .mode-chips {
        flex-wrap: wrap;
        justify-content: center;
    }

    .primary-btn .btn-text {
        padding: 1rem 2.4rem;
        font-size: 1.1rem;
    }

    .table-toolbar {
        flex-direction: column;
        align-items: stretch;
    }

    .search-box {
        max-width: 100%;
    }

    .stats-overview {
        grid-template-columns: 1fr 1fr;
    }

    .stats-grid-container {
        grid-template-columns: 1fr;
    }
}