:root {
    --bg: #f5f2eb;
    --text: #2a2520;
    --text-muted: #8a8078;
    --border: #e0dbd4;
    --lecture: #2a7ae8;
    --lecture-bg: #edf4fe;
    --seminar: #e8432a;
    --seminar-bg: #fef0ed;
    --english: #1a9a6c;
    --english-bg: #eefbf5;
    --practice: #9b59b6;
    --practice-bg: #f5eef8;
    --online: #e8a32a;
    --online-bg: #fef8ed;
    --exam: #2E282A;
    --exam-bg: #f0eeef;
    --gap-bg: #f9f7f3;
    --shadow: 0 1px 3px rgba(42, 37, 32, 0.06);
    --shadow-hover: 0 4px 12px rgba(42, 37, 32, 0.1);
}

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

body {
    font-family: 'Source Serif 4', Georgia, serif;
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    min-height: 100dvh;
    display: flex;
    flex-direction: column;
}

/* Header */

.header {
    padding: 22px 28px 14px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    max-width: 1440px;
    margin: 0 auto;
    width: 100%;
}

.header h1 {
    font-size: 1.15rem;
    font-weight: 600;
    letter-spacing: -0.02em;
}

.header h1 span {
    color: var(--text-muted);
    font-weight: 400;
}

.header-controls {
    display: flex;
    align-items: center;
    gap: 16px;
}

.subtitle {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.68rem;
    color: var(--text-muted);
    letter-spacing: 0.02em;
}

.week-nav {
    display: flex;
    align-items: center;
    gap: 10px;
}

.nav-btn {
    background: #fff;
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 7px 14px;
    cursor: pointer;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.74rem;
    color: var(--text);
    text-decoration: none;
    transition: all 0.15s;
    box-shadow: var(--shadow);
}

.nav-btn:hover {
    box-shadow: var(--shadow-hover);
    border-color: var(--text-muted);
}

.nav-btn.disabled {
    opacity: 0.35;
    pointer-events: none;
    cursor: default;
}

.nav-today {
    color: var(--seminar);
    border-color: var(--seminar);
    background: var(--seminar-bg);
}

.nav-today:hover {
    background: #fde4df;
}

.week-label {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.78rem;
    color: var(--text-muted);
    min-width: 140px;
    text-align: center;
}

.trajectory-form {
    display: flex;
    align-items: center;
    gap: 6px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.74rem;
    color: var(--text-muted);
}

.trajectory-form select {
    padding: 5px 8px;
    border: 1px solid var(--border);
    border-radius: 6px;
    background: #fff;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.74rem;
    color: var(--text);
    box-shadow: var(--shadow);
    cursor: pointer;
}

/* Legend */

.legend {
    max-width: 1440px;
    margin: 0 auto;
    padding: 0 28px 12px;
    display: flex;
    gap: 14px;
    flex-wrap: wrap;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 5px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.66rem;
    color: var(--text-muted);
}

.legend-dot {
    width: 10px;
    height: 10px;
    border-radius: 3px;
}

.dot-lecture { background: var(--lecture); }
.dot-seminar { background: var(--seminar); }
.dot-english { background: var(--english); }
.dot-practice { background: var(--practice); }
.dot-online { background: var(--online); }
.dot-exam { background: var(--exam); }

/* Schedule Grid */

.grid-wrapper {
    max-width: 1440px;
    margin: 0 auto;
    padding: 16px 28px 60px;
    overflow-x: auto;
    flex: 1;
    width: 100%;
}

.schedule-grid {
    display: grid;
    grid-template-columns: 64px repeat(6, minmax(0, 1fr));
    min-width: 780px;
}

/* Grid corner (top-left empty cell) */
.grid-corner {
    border-bottom: 1px solid var(--border);
}

/* Day headers */
.day-header {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.68rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    padding: 8px 8px;
    color: var(--text-muted);
    border-bottom: 1px solid var(--border);
    border-left: 1px solid var(--border);
    background: var(--bg);
    position: sticky;
    top: 0;
    z-index: 2;
}

.day-header.today {
    color: #e8432a;
    font-weight: 600;
}

.day-header .date {
    font-weight: 600;
    color: var(--text);
    margin-left: 3px;
}

.day-header.today .date {
    color: #e8432a;
}

/* Time cells (left column) */
.time-cell {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 6px 4px;
    border-bottom: 1px solid var(--border);
    background: var(--bg);
}

.slot-num {
    font-family: 'JetBrains Mono', monospace;
    font-size: 1rem;
    font-weight: 600;
    color: var(--text);
    line-height: 1;
}

.slot-time {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.64rem;
    color: var(--text-muted);
    line-height: 1;
    margin-top: 2px;
}

/* Day cells */
.day-cell {
    border-left: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
    padding: 3px 4px;
    min-height: 68px;
}

.empty-cell {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100%;
    color: var(--border);
    font-size: 1rem;
}

/* Break row */
.break-label {
    min-height: auto;
    padding: 4px;
    border-bottom: 1px solid var(--border);
}

.break-icon {
    font-size: 0.8rem;
    line-height: 1;
}

.break-cell {
    border-left: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
    background: var(--gap-bg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.62rem;
    color: var(--text-muted);
    padding: 4px;
    min-height: 28px;
}

/* Extra events row */
.extra-label {
    border-bottom: none;
}

.extra-cell {
    border-bottom: none;
}

/* Event cards */
.slot {
    border-radius: 6px;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.slot + .slot {
    margin-top: 3px;
}

.slot.card {
    padding: 6px 8px;
    border-left: 3px solid;
    box-shadow: var(--shadow);
    transition: box-shadow 0.15s;
    cursor: default;
    min-height: 54px;
}

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

.slot.card.lecture {
    background: var(--lecture-bg);
    border-color: var(--lecture);
}

.slot.card.seminar {
    background: var(--seminar-bg);
    border-color: var(--seminar);
}

.slot.card.english {
    background: var(--english-bg);
    border-color: var(--english);
}

.slot.card.practice {
    background: var(--practice-bg);
    border-color: var(--practice);
}

.slot.card.online {
    background: var(--online-bg);
    border-color: var(--online);
}

.slot.card.exam,
.slot.card.credit,
.slot.card.retake,
.slot.card.consult {
    background: var(--exam-bg);
    border-color: var(--exam);
}

.slot.card.cancelled {
    opacity: 0.45;
}

.slot.card.compact {
    min-height: 48px;
    opacity: 0.85;
    border-style: dotted;
}

/* Card contents */

.card-time {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.6rem;
    color: var(--text-muted);
    line-height: 1;
    display: flex;
    align-items: center;
    gap: 4px;
    margin-bottom: 2px;
}

.card-title {
    font-size: 0.8rem;
    font-weight: 600;
    line-height: 1.5;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.card-bottom {
    display: flex;
    align-items: center;
    gap: 4px;
    margin-top: 3px;
}

.badge {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.52rem;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    padding: 1px 5px;
    border-radius: 3px;
    font-weight: 600;
    color: #fff;
    flex-shrink: 0;
}

.badge.lec { background: var(--lecture); }
.badge.sem { background: var(--seminar); }
.badge.eng { background: var(--english); }
.badge.prac { background: var(--practice); }
.badge.onl { background: var(--online); }
.badge.exam { background: var(--exam); }
.badge.traj { background: #92400e; }

.card-info {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.6rem;
    color: var(--text-muted);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.card-cancelled {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.56rem;
    color: #dc2626;
    font-weight: 600;
    text-transform: uppercase;
}

.change-dot {
    display: inline-block;
    width: 5px;
    height: 5px;
    border-radius: 50%;
    background: #dc2626;
    vertical-align: middle;
    margin-left: 3px;
}

/* Day tabs - hidden on desktop */
.day-tabs {
    display: none;
}

.footer {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.62rem;
    color: var(--text-muted);
    text-align: center;
    padding: 12px 28px;
    display: flex;
    justify-content: center;
    gap: 16px;
}

.footer a {
    color: var(--text-muted);
}

/* ========================================
   Mobile: day-tab single-day view
   ======================================== */

@media (max-width: 768px) {
    body {
        overscroll-behavior-x: none;
    }

    .header {
        padding: 12px;
        flex-direction: column;
        gap: 10px;
        align-items: flex-start;
    }

    .header h1 {
        font-size: 1rem;
    }

    .header-controls {
        flex-direction: column;
        align-items: flex-start;
        gap: 8px;
        width: 100%;
    }

    .week-nav {
        width: 100%;
        justify-content: space-between;
    }

    .legend {
        padding: 0 12px 8px;
        gap: 10px;
    }

    .grid-wrapper {
        padding: 0 0 20px;
        overflow-x: visible;
        overscroll-behavior-x: none;
        flex: 1;
    }

    /* --- Tab bar --- */

    .day-tabs {
        display: flex;
        position: sticky;
        top: 0;
        z-index: 10;
        background: var(--bg);
        padding: 6px 8px;
        gap: 2px;
        border-bottom: 1px solid var(--border);
        margin-bottom: 4px;
    }

    .day-tab {
        flex: 1;
        display: flex;
        flex-direction: column;
        align-items: center;
        gap: 1px;
        padding: 6px 2px 4px;
        border: none;
        background: none;
        cursor: pointer;
        border-radius: 8px;
        transition: background 0.15s;
        -webkit-tap-highlight-color: transparent;
    }

    .day-tab.active {
        background: #fff;
        box-shadow: var(--shadow);
    }

    .day-tab.empty {
        opacity: 0.35;
    }

    .tab-weekday {
        font-family: 'JetBrains Mono', monospace;
        font-size: 0.72rem;
        font-weight: 600;
        color: var(--text);
        line-height: 1;
    }

    .day-tab.today .tab-weekday {
        color: #e8432a;
    }

    .tab-date {
        font-family: 'JetBrains Mono', monospace;
        font-size: 0.58rem;
        color: var(--text-muted);
        line-height: 1;
    }

    .tab-dot {
        width: 4px;
        height: 4px;
        border-radius: 50%;
        background: var(--lecture);
        margin-top: 1px;
    }

    /* --- Grid: collapse to 2 columns --- */

    .schedule-grid {
        grid-template-columns: 52px 1fr;
        min-width: unset;
        padding: 0 8px;
    }

    /* Hide desktop column headers and corner - unconditional */
    .grid-corner,
    .schedule-grid .day-header {
        display: none !important;
    }

    /* Hide all day-indexed cells by default */
    .schedule-grid .day-cell[data-day],
    .schedule-grid .break-cell[data-day],
    .schedule-grid .extra-cell[data-day] {
        display: none;
    }

    /* Show only the active day's cells */
    .grid-wrapper.active-day-0 .schedule-grid .day-cell[data-day="0"],
    .grid-wrapper.active-day-0 .schedule-grid .break-cell[data-day="0"],
    .grid-wrapper.active-day-0 .schedule-grid .extra-cell[data-day="0"],
    .grid-wrapper.active-day-1 .schedule-grid .day-cell[data-day="1"],
    .grid-wrapper.active-day-1 .schedule-grid .break-cell[data-day="1"],
    .grid-wrapper.active-day-1 .schedule-grid .extra-cell[data-day="1"],
    .grid-wrapper.active-day-2 .schedule-grid .day-cell[data-day="2"],
    .grid-wrapper.active-day-2 .schedule-grid .break-cell[data-day="2"],
    .grid-wrapper.active-day-2 .schedule-grid .extra-cell[data-day="2"],
    .grid-wrapper.active-day-3 .schedule-grid .day-cell[data-day="3"],
    .grid-wrapper.active-day-3 .schedule-grid .break-cell[data-day="3"],
    .grid-wrapper.active-day-3 .schedule-grid .extra-cell[data-day="3"],
    .grid-wrapper.active-day-4 .schedule-grid .day-cell[data-day="4"],
    .grid-wrapper.active-day-4 .schedule-grid .break-cell[data-day="4"],
    .grid-wrapper.active-day-4 .schedule-grid .extra-cell[data-day="4"],
    .grid-wrapper.active-day-5 .schedule-grid .day-cell[data-day="5"],
    .grid-wrapper.active-day-5 .schedule-grid .break-cell[data-day="5"],
    .grid-wrapper.active-day-5 .schedule-grid .extra-cell[data-day="5"] {
        display: block;
    }

    /* Break cells need flex for centering */
    .grid-wrapper.active-day-0 .schedule-grid .break-cell[data-day="0"],
    .grid-wrapper.active-day-1 .schedule-grid .break-cell[data-day="1"],
    .grid-wrapper.active-day-2 .schedule-grid .break-cell[data-day="2"],
    .grid-wrapper.active-day-3 .schedule-grid .break-cell[data-day="3"],
    .grid-wrapper.active-day-4 .schedule-grid .break-cell[data-day="4"],
    .grid-wrapper.active-day-5 .schedule-grid .break-cell[data-day="5"] {
        display: flex;
    }

    /* --- Cards: bigger, more readable --- */

    .day-cell {
        min-height: 72px;
        padding: 4px 6px;
        border-left: none;
    }

    .slot.card {
        min-height: 64px;
        padding: 10px 12px;
        border-left-width: 4px;
    }

    .slot.card.compact {
        min-height: 56px;
    }

    .card-title {
        font-size: 0.94rem;
        white-space: normal;
        line-height: 1.3;
    }

    .card-time {
        font-size: 0.68rem;
        margin-bottom: 2px;
    }

    .card-bottom {
        margin-top: 4px;
    }

    .badge {
        font-size: 0.58rem;
        padding: 2px 6px;
    }

    .card-info {
        font-size: 0.68rem;
    }

    .card-cancelled {
        font-size: 0.62rem;
        margin-top: 2px;
    }

    /* --- Break row --- */

    .break-cell {
        border-left: none;
        min-height: 32px;
        font-size: 0.66rem;
    }

    /* --- Empty cells --- */

    .empty-cell {
        color: var(--border);
        font-size: 0.8rem;
        min-height: 48px;
    }

    /* --- Time column --- */

    .time-cell {
        padding: 8px 4px;
    }

    .slot-num {
        font-size: 0.9rem;
    }

    .slot-time {
        font-size: 0.56rem;
    }

    /* --- Extra events --- */

    .extra-cell {
        border-left: none;
    }
}