.timetable-page {
    max-width: 1120px;
    margin: 0 auto;
}
.timetable-card {
    background: #ffffff;
    border-radius: 20px;
    padding: 20px 18px 18px;
    box-shadow:
        0 18px 45px rgba(15, 23, 42, 0.10),
        0 0 0 1px rgba(15, 23, 42, 0.02);
}
.timetable-header {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    margin-bottom: 12px;
}
.timetable-heading {
    margin: 0;
    font-size: 17px;
    font-weight: 600;
}
.timetable-subtext {
    margin: 0;
    font-size: 12px;
    color: #6b7280;
}
.timetable-grid-wrapper {
    overflow-x: auto;
}
.timetable-grid {
    width: 100%;
    border-collapse: collapse;
    font-size: 13px;
}
.timetable-grid th,
.timetable-grid td {
    border: 1px solid #e5e7eb;
    padding: 6px 8px;
    text-align: center;
}
.timetable-grid thead th {
    background: #f3f4f6;
    font-weight: 600;
}
.tt-day {
    font-weight: 600;
    background: #f9fafb;
}
.tt-subject {
    font-weight: 500;
    color: #111827;
}
.tt-empty {
    color: #9ca3af;
}
@media (max-width: 768px) {
    .timetable-card { padding: 16px 12px 14px; }
}
*,
*::before,
*::after {
    box-sizing: border-box;
}

html, body {
    margin: 0;
    padding: 0;
}

body {
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background: #f3f4f6;
    color: #111827;
}

/* App shell */
.app-shell {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Top bar */
.topbar {
    height: 64px;
    background: #0f172a;
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 20px;
    box-shadow: 0 4px 12px rgba(15, 23, 42, 0.5);
}

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

.avatar {
    width: 40px;
    height: 40px;
    border-radius: 999px;
    overflow: hidden;
    border: 2px solid rgba(255, 255, 255, 0.6);
    flex-shrink: 0;
    background: #111827;
}

.avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.identity-name {
    font-weight: 600;
    font-size: 15px;
}

.identity-meta {
    font-size: 13px;
    opacity: 0.85;
}

.topbar-right {
    display: flex;
    align-items: center;
    gap: 8px;
}

.icon-btn {
    width: 32px;
    height: 32px;
    border-radius: 999px;
    border: 1px solid rgba(255, 255, 255, 0.3);
    background: transparent;
    color: #fff;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    font-size: 14px;
    transition: background 0.15s ease-out, transform 0.1s ease-out;
}

.icon-btn i {
    font-size: 14px;
}

.icon-btn:hover {
    background: rgba(15, 23, 42, 0.4);
    transform: translateY(-1px);
}

.icon-btn.logout-btn {
    background: rgba(239, 68, 68, 0.12);
    border-color: rgba(248, 113, 113, 0.7);
}

.icon-btn.logout-btn:hover {
    background: rgba(239, 68, 68, 0.22);
}

/* Main area */
.main {
    flex: 1;
    padding: 24px 18px 32px;
}

/* Grid of tiles */
/* Desktop: 4 columns, Tablet: 3, Mobile: 2 */
.grid {
    max-width: 1120px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 20px;
}

.tile {
    text-decoration: none;
    background: #ffffff;
    border-radius: 20px;
    padding: 26px 20px 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    box-shadow:
        0 18px 45px rgba(15, 23, 42, 0.10),
        0 0 0 1px rgba(15, 23, 42, 0.02);
    color: #111827;
    transition:
        transform 0.14s ease-out,
        box-shadow 0.14s ease-out,
        background 0.14s ease-out;
}

.tile:hover {
    transform: translateY(-4px);
    box-shadow:
        0 26px 60px rgba(15, 23, 42, 0.18),
        0 0 0 1px rgba(15, 23, 42, 0.04);
    background: #f9fafb;
}

.tile-icon {
    width: 52px;
    height: 52px;
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;        /* transparent bg */
    color: #1f2933;                 /* dark grey */
}

.tile-icon i {
    font-size: 26px;
    font-weight: 400;
}

.tile-label {
    text-align: center;
    font-size: 14px;
    font-weight: 500;
}

/* Responsive */
@media (max-width: 960px) {
    .grid {
        grid-template-columns: repeat(3, minmax(0, 1fr));
        gap: 16px;
    }
}

@media (max-width: 720px) {
    .topbar {
        padding-inline: 12px;
    }

    .identity-name {
        font-size: 14px;
    }

    .identity-meta {
        font-size: 12px;
    }

    .grid {
        grid-template-columns: repeat(2, minmax(0, 1fr)); /* mobile: 2 columns */
        gap: 14px;
    }

    .tile {
        padding: 20px 14px 16px;
    }

    .tile-icon {
        width: 46px;
        height: 46px;
    }

    .tile-icon i {
        font-size: 20px;
    }

    .tile-label {
        font-size: 13px;
    }
}