* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

main {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: #f0f4f8;
    color: #1a202c;
    padding: 24px;
    min-height: 100vh;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
}

/* ===== TOP HEADER ===== */
.header-card {
    background: linear-gradient(135deg, #2d3748 0%, #4a5568 100%);
    border-radius: 20px;
    padding: 30px 36px;
    margin-bottom: 28px;
    color: white;
    box-shadow: 0 8px 32px rgba(45, 55, 72, 0.25);
    position: relative;
    overflow: hidden;
}

.header-card::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 400px;
    height: 400px;
    background: rgba(255, 255, 255, 0.04);
    border-radius: 50%;
    pointer-events: none;
}

.header-card::after {
    content: '';
    position: absolute;
    bottom: -40%;
    left: -10%;
    width: 300px;
    height: 300px;
    background: rgba(255, 255, 255, 0.03);
    border-radius: 50%;
    pointer-events: none;
}

.header-top {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    flex-wrap: wrap;
    gap: 16px;
    position: relative;
    z-index: 1;
}

.header-left {
    display: flex;
    align-items: center;
    gap: 20px;
}

.back-btn {
    background: rgba(255, 255, 255, 0.15);
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: white;
    padding: 10px 16px;
    border-radius: 12px;
    cursor: pointer;
    font-size: 16px;
    transition: all 0.2s;
}

.back-btn:hover {
    background: rgba(255, 255, 255, 0.25);
    transform: translateX(-2px);
}

.header-title h1 {
    font-size: 28px;
    font-weight: 800;
    letter-spacing: -0.5px;
}

.header-title .subtitle {
    font-size: 14px;
    opacity: 0.8;
    margin-top: 4px;
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
}

.header-title .subtitle span {
    display: flex;
    align-items: center;
    gap: 6px;
}

.header-right {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: 8px;
    position: relative;
    z-index: 1;
}

.header-right .badge {
    background: rgba(255, 255, 255, 0.15);
    padding: 6px 16px;
    border-radius: 20px;
    font-size: 13px;
    font-weight: 500;
}

.header-right .stats-mini {
    display: flex;
    gap: 16px;
    font-size: 13px;
    opacity: 0.85;
}

.header-right .stats-mini i {
    margin-right: 4px;
}

/* ===== ACTION BUTTONS ===== */
.action-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 12px;
    margin-bottom: 24px;
    background: white;
    padding: 14px 24px;
    border-radius: 14px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.06);
}

.action-bar-left {
    display: flex;
    align-items: center;
    gap: 12px;
}

.action-bar-left .current-week {
    font-weight: 600;
    color: #2d3748;
    font-size: 15px;
}

.week-nav {
    display: flex;
    gap: 6px;
}

.week-nav button {
    background: #f7fafc;
    border: 1px solid #e2e8f0;
    padding: 6px 12px;
    border-radius: 8px;
    font-size: 13px;
    cursor: pointer;
    transition: all 0.2s;
    color: #4a5568;
}

.week-nav button:hover {
    background: #edf2f7;
}

.week-nav button.active {
    background: #48bb78;
    color: white;
    border-color: #48bb78;
}

.action-bar-right {
    display: flex;
    gap: 10px;
}

.action-btn {
    padding: 8px 18px;
    border-radius: 10px;
    font-size: 13px;
    font-weight: 500;
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 6px;
    transition: all 0.2s;
    font-family: 'Inter', sans-serif;
}

.action-btn.print {
    background: #edf2f7;
    color: #4a5568;
}

.action-btn.print:hover {
    background: #e2e8f0;
}

.action-btn.download {
    background: #63b3ed;
    color: white;
}

.action-btn.download:hover {
    background: #4299e1;
    transform: translateY(-1px);
}

.action-btn.share {
    background: #9f7aea;
    color: white;
}

.action-btn.share:hover {
    background: #805ad5;
    transform: translateY(-1px);
}

/* ===== TIMETABLE TABLE ===== */
.timetable-wrapper {
    background: white;
    border-radius: 16px;
    overflow: hidden;
    box-shadow: 0 1px 3px rgba(0,0,0,0.06);
    overflow-x: auto;
}

.timetable-table {
    width: 100%;
    border-collapse: collapse;
    min-width: 900px;
}

.timetable-table thead {
    background: #f9fafb;
    border-bottom: 2px solid #edf2f7;
}

.timetable-table thead th {
    padding: 16px 20px;
    text-align: center;
    font-size: 13px;
    font-weight: 600;
    color: #718096;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.timetable-table thead th:first-child {
    text-align: left;
    padding-left: 24px;
}

.timetable-table thead th .day-badge {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2px;
}

.timetable-table thead th .day-badge .day-name {
    font-size: 16px;
    font-weight: 700;
    color: #2d3748;
    text-transform: capitalize;
}

.timetable-table thead th .day-badge .day-date {
    font-size: 12px;
    font-weight: 400;
    color: #a0aec0;
    text-transform: none;
}

.timetable-table tbody tr {
    border-bottom: 1px solid #f0f4f8;
    transition: background 0.15s;
}

.timetable-table tbody tr:hover {
    background: #fafcff;
}

.timetable-table tbody tr:last-child {
    border-bottom: none;
}

.timetable-table tbody td {
    padding: 10px 12px;
    vertical-align: middle;
    text-align: center;
}

.timetable-table tbody td:first-child {
    text-align: left;
    padding-left: 24px;
    font-weight: 500;
    color: #4a5568;
    font-size: 13px;
    background: #fafcff;
    white-space: nowrap;
}

.timetable-table tbody td:first-child i {
    color: #a0aec0;
    margin-right: 6px;
}

/* Subject Cell */
.subject-content {
    padding: 8px 10px;
    border-radius: 10px;
    border-left: 4px solid #63b3ed;
    background: rgba(66, 153, 225, 0.08);
    min-height: 55px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    transition: all 0.2s;
}

.subject-content:hover {
    transform: scale(1.02);
    box-shadow: 0 4px 12px rgba(0,0,0,0.08);
}

.subject-content.break-cell {
    background: #fffbeb;
    border-left-color: #ecc94b;
    justify-content: center;
    align-items: center;
}

.subject-content.break-cell .subject-name {
    color: #975a16;
    font-weight: 700;
    font-size: 16px;
}

.subject-content.break-cell i {
    font-size: 20px;
    color: #d69e2e;
}

.subject-content .subject-name {
    font-weight: 600;
    font-size: 14px;
    color: #2d3748;
    line-height: 1.2;
}

.subject-content .subject-teacher {
    font-size: 11px;
    color: #718096;
    margin-top: 2px;
    display: flex;
    align-items: center;
    gap: 4px;
}

.subject-content .subject-teacher i {
    font-size: 10px;
}

.subject-content .subject-room {
    font-size: 10px;
    color: #a0aec0;
    margin-top: 1px;
    display: flex;
    align-items: center;
    gap: 4px;
}

.subject-content .subject-room i {
    font-size: 9px;
}

/* Empty cell */
.subject-content.empty {
    background: #f7fafc;
    border-left-color: #e2e8f0;
    opacity: 0.5;
}

/* ===== LEGEND ===== */
.legend-bar {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    padding: 16px 24px;
    background: #f9fafb;
    border-top: 1px solid #edf2f7;
    align-items: center;
}

.legend-bar .legend-title {
    font-size: 13px;
    font-weight: 600;
    color: #4a5568;
    margin-right: 8px;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 12px;
    color: #4a5568;
}

.legend-item .color-dot {
    width: 14px;
    height: 14px;
    border-radius: 4px;
}

/* ===== STATS FOOTER ===== */
.stats-footer {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 16px;
    margin-top: 24px;
}

.stats-footer .stat-item {
    background: white;
    padding: 16px 20px;
    border-radius: 12px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.06);
    display: flex;
    align-items: center;
    gap: 14px;
}

.stats-footer .stat-item .icon {
    width: 44px;
    height: 44px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
}

.stats-footer .stat-item .info .number {
    font-size: 22px;
    font-weight: 700;
    color: #2d3748;
}

.stats-footer .stat-item .info .label {
    font-size: 13px;
    color: #718096;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
    body {
        padding: 12px;
    }

    .header-card {
        padding: 20px;
        border-radius: 14px;
    }

    .header-title h1 {
        font-size: 20px;
    }

    .header-title .subtitle {
        font-size: 12px;
        gap: 10px;
        flex-direction: column;
    }

    .header-right .stats-mini {
        flex-direction: column;
        gap: 4px;
        font-size: 12px;
    }

    .action-bar {
        padding: 12px 16px;
        flex-direction: column;
        align-items: stretch;
    }

    .action-bar-right {
        flex-wrap: wrap;
    }

    .timetable-table {
        min-width: 700px;
    }

    .timetable-table thead th {
        font-size: 11px;
        padding: 10px 8px;
    }

    .timetable-table thead th .day-badge .day-name {
        font-size: 13px;
    }

    .timetable-table tbody td {
        padding: 6px 8px;
    }

    .timetable-table tbody td:first-child {
        font-size: 11px;
        padding-left: 12px;
    }

    .subject-content {
        padding: 4px 6px;
        min-height: 45px;
    }

    .subject-content .subject-name {
        font-size: 12px;
    }

    .subject-content .subject-teacher,
    .subject-content .subject-room {
        font-size: 9px;
    }

    .legend-bar {
        padding: 12px 16px;
        gap: 10px;
    }

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

@media (max-width: 480px) {
    .timetable-table {
        min-width: 500px;
    }

    .timetable-table thead th .day-badge .day-name {
        font-size: 11px;
    }

    .timetable-table thead th .day-badge .day-date {
        font-size: 9px;
    }

    .subject-content .subject-name {
        font-size: 10px;
    }

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

/* ===== PRINT STYLES ===== */
@media print {
    body {
        background: white;
        padding: 0;
    }

    .header-card {
        background: #2d3748 !important;
        -webkit-print-color-adjust: exact !important;
        print-color-adjust: exact !important;
    }

    .back-btn,
    .action-bar,
    .action-btn {
        display: none !important;
    }

    .timetable-wrapper {
        box-shadow: none !important;
        border: 1px solid #e2e8f0;
    }

    .subject-content {
        -webkit-print-color-adjust: exact !important;
        print-color-adjust: exact !important;
    }

    .subject-content.break-cell {
        -webkit-print-color-adjust: exact !important;
        print-color-adjust: exact !important;
    }
}