:root {
    --bg-primary: #0a0e17;
    --bg-card: #141924;
    --bg-hover: #1c2333;
    --border: #2a3144;
    --text-primary: #e4e8f1;
    --text-muted: #8892a6;
    --accent: #3b82f6;
    --price-low: #4ade80;
    --price-mid: #facc15;
    --price-high: #f87171;
    --cell-low: #0d2818;
    --cell-mid: #2a2310;
    --cell-high: #2a1015;
    --cell-empty: #1a1a2a;
}

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

body {
    font-family: 'Inter', sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
}

a {
    color: var(--accent);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

/* Header */
.header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 24px;
    background: var(--bg-card);
    border-bottom: 1px solid var(--border);
}

.header__logo {
    font-size: 18px;
    font-weight: 700;
    color: var(--text-primary);
}

.header__logo:hover {
    text-decoration: none;
    color: var(--accent);
}

.header__nav {
    display: flex;
    gap: 16px;
}

.nav-link {
    padding: 6px 12px;
    border-radius: 6px;
    font-size: 14px;
    color: var(--text-muted);
    transition: all 0.2s;
}

.nav-link:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
    text-decoration: none;
}

/* Main */
.main {
    max-width: 1100px;
    margin: 0 auto;
    padding: 32px 24px;
}

.page-title {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 8px;
}

.page-subtitle {
    color: var(--text-muted);
    font-size: 14px;
    margin-bottom: 32px;
}

/* Index page */
.route-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
    margin-bottom: 32px;
}

.route-card {
    display: block;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 24px;
    transition: all 0.2s;
    color: var(--text-primary);
}

.route-card:hover {
    background: var(--bg-hover);
    border-color: var(--accent);
    text-decoration: none;
    transform: translateY(-2px);
}

.route-card__header {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 4px;
}

.route-card__arrow {
    color: var(--accent);
}

.route-card__codes {
    font-size: 13px;
    color: var(--text-muted);
    margin-bottom: 16px;
}

.route-card__price {
    font-size: 28px;
    font-weight: 700;
    color: var(--price-low);
    margin-bottom: 12px;
}

.route-card__price--empty {
    color: var(--text-muted);
    font-size: 20px;
}

.route-card__details {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    color: var(--text-muted);
    margin-bottom: 8px;
}

.airline-logo {
    width: 24px;
    height: 24px;
    border-radius: 4px;
}

.route-card__date {
    font-size: 13px;
    color: var(--text-muted);
    margin-bottom: 16px;
}

.route-card__cta {
    font-size: 14px;
    font-weight: 500;
    color: var(--accent);
}

/* Calendar page */
.calendar-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 16px;
    margin-bottom: 24px;
}

.route-switcher {
    display: flex;
    gap: 8px;
}

.route-btn {
    padding: 8px 16px;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-muted);
    background: var(--bg-card);
    border: 1px solid var(--border);
    transition: all 0.2s;
}

.route-btn:hover {
    background: var(--bg-hover);
    text-decoration: none;
    color: var(--text-primary);
}

.route-btn--active {
    background: var(--accent);
    color: #fff;
    border-color: var(--accent);
}

.route-btn--active:hover {
    color: #fff;
}

/* Month navigation */
.month-nav {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 24px;
    margin-bottom: 20px;
}

.month-btn {
    background: var(--bg-card);
    border: 1px solid var(--border);
    color: var(--text-primary);
    padding: 8px 16px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 14px;
    transition: all 0.2s;
}

.month-btn:hover {
    background: var(--bg-hover);
    border-color: var(--accent);
}

.month-label {
    font-size: 18px;
    font-weight: 600;
    min-width: 200px;
    text-align: center;
}

/* Calendar grid */
.calendar-grid {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 4px;
    margin-bottom: 20px;
}

.calendar-loading {
    grid-column: 1 / -1;
    text-align: center;
    padding: 48px;
    color: var(--text-muted);
}

.cal-weekday {
    text-align: center;
    font-size: 12px;
    font-weight: 600;
    color: var(--text-muted);
    padding: 8px 4px;
    text-transform: uppercase;
}

.cal-cell {
    background: var(--cell-empty);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 8px;
    min-height: 80px;
    cursor: pointer;
    transition: all 0.2s;
    position: relative;
}

.cal-cell:hover {
    border-color: var(--accent);
    transform: scale(1.02);
    z-index: 1;
}

.cal-cell--empty {
    background: transparent;
    border-color: transparent;
    cursor: default;
}

.cal-cell--empty:hover {
    border-color: transparent;
    transform: none;
}

.cal-cell--past {
    opacity: 0.5;
}

.cal-cell--low {
    background: var(--cell-low);
}

.cal-cell--mid {
    background: var(--cell-mid);
}

.cal-cell--high {
    background: var(--cell-high);
}

.cal-cell__day {
    font-size: 16px;
    font-weight: 700;
    margin-bottom: 4px;
}

.cal-cell__price-row {
    display: flex;
    align-items: center;
    gap: 3px;
}

.cal-cell__price {
    font-size: 16px;
    font-weight: 800;
}

.cal-cell__price--low { color: var(--price-low); }
.cal-cell__price--mid { color: var(--price-mid); }
.cal-cell__price--high { color: var(--price-high); }

.price-arrow {
    font-weight: 700;
    font-size: 14px;
}

.price-arrow--down {
    color: var(--price-low);
}

.price-arrow--up {
    color: var(--price-high);
}

.cal-cell__count {
    position: absolute;
    right: 5px;
    bottom: 4px;
    font-size: 10px;
    font-weight: 600;
    color: var(--text-muted);
    background: rgba(255, 255, 255, 0.08);
    border-radius: 4px;
    padding: 1px 5px;
}

/* Legend */
.legend {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    justify-content: center;
    margin-bottom: 24px;
    font-size: 13px;
    color: var(--text-muted);
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 6px;
}

.legend-dot {
    width: 12px;
    height: 12px;
    border-radius: 3px;
}

.legend-dot--low { background: var(--cell-low); border: 1px solid var(--price-low); }
.legend-dot--mid { background: var(--cell-mid); border: 1px solid var(--price-mid); }
.legend-dot--high { background: var(--cell-high); border: 1px solid var(--price-high); }

/* Modal */
.modal-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.7);
    z-index: 100;
    align-items: center;
    justify-content: center;
}

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

.modal {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    max-width: 750px;
    width: 94%;
    max-height: 85vh;
    overflow-y: auto;
}

.modal__header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px 24px 12px;
    border-bottom: 1px solid var(--border);
}

.modal__title {
    font-size: 16px;
    font-weight: 600;
}

.modal__close {
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 24px;
    cursor: pointer;
    padding: 0 4px;
    line-height: 1;
}

.modal__close:hover {
    color: var(--text-primary);
}

.modal__body {
    padding: 16px 24px 24px;
}

/* Flight card in modal */
.flight-card {
    border: 1px solid var(--border);
    border-radius: 10px;
    margin-bottom: 10px;
    overflow: hidden;
}

.flight-card:last-child {
    margin-bottom: 0;
}

.flight-card__main {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 16px;
    background: var(--bg-hover);
    gap: 12px;
}

.flight-card__info {
    display: flex;
    align-items: center;
    gap: 10px;
    min-width: 0;
}

.flight-card__logo {
    width: 32px;
    height: 32px;
    border-radius: 6px;
    flex-shrink: 0;
}

.flight-card__details {
    display: flex;
    flex-direction: column;
    gap: 1px;
    min-width: 0;
}

.flight-card__name {
    font-weight: 600;
    font-size: 14px;
}

.flight-card__meta {
    font-size: 12px;
    color: var(--text-muted);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.flight-card__right {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-shrink: 0;
}

.flight-card__price {
    font-size: 18px;
    font-weight: 700;
    color: var(--price-low);
    white-space: nowrap;
}

.flight-card__buy {
    display: inline-block;
    padding: 6px 14px;
    background: var(--accent);
    color: #fff;
    border-radius: 6px;
    font-size: 12px;
    font-weight: 500;
    transition: all 0.2s;
    white-space: nowrap;
}

.flight-card__buy:hover {
    background: #2563eb;
    text-decoration: none;
    color: #fff;
}

/* History toggle bar */
.flight-card__hist-toggle {
    padding: 8px 16px;
    font-size: 12px;
    color: var(--text-muted);
    cursor: pointer;
    user-select: none;
    border-top: 1px solid var(--border);
    transition: color 0.2s;
}

.flight-card__hist-toggle:hover {
    color: var(--accent);
}

.flight-card__hist-arrow {
    font-size: 9px;
    display: inline-block;
    transition: transform 0.25s;
}

.flight-card__hist-toggle--open .flight-card__hist-arrow {
    transform: rotate(180deg);
}

.flight-card__hist-body {
    display: none;
    padding: 10px 16px 14px;
    border-top: 1px solid var(--border);
}

.flight-card__hist-body--open {
    display: block;
}

.flight-card__no-changes {
    font-style: italic;
}

.history-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 13px;
}

.history-table thead th {
    text-align: left;
    font-weight: 600;
    color: var(--text-muted);
    padding: 6px 8px;
    border-bottom: 1px solid var(--border);
    font-size: 12px;
    white-space: nowrap;
}

.history-table tbody td {
    padding: 6px 8px;
    border-bottom: 1px solid rgba(42, 49, 68, 0.5);
}

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

.history-date {
    color: var(--text-muted);
    white-space: nowrap;
}

.history-down {
    color: var(--price-low);
    font-weight: 600;
}

.history-up {
    color: var(--price-high);
    font-weight: 600;
}

.history-table__row--hidden {
    display: none;
}

.history-table__row--hidden.history-table__row--shown {
    display: table-row;
}

.history-table__toggle {
    display: inline-block;
    margin-top: 8px;
    font-size: 13px;
    color: var(--accent);
    cursor: pointer;
}


/* Last update */
.last-update {
    text-align: center;
    font-size: 13px;
    color: var(--text-muted);
    padding: 16px 0;
}

/* Footer */
.footer {
    border-top: 1px solid var(--border);
    margin-top: 40px;
    padding: 24px;
}

.footer__inner {
    max-width: 1100px;
    margin: 0 auto;
    text-align: center;
}

.footer__contact {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    font-size: 14px;
    color: var(--text-muted);
    margin-bottom: 12px;
}

.footer__tg {
    display: inline-flex;
    color: var(--accent);
    transition: color 0.2s, transform 0.2s;
}

.footer__tg:hover {
    color: #29b6f6;
    transform: scale(1.15);
    text-decoration: none;
}

.footer__disclaimer {
    font-size: 12px;
    color: var(--text-muted);
    opacity: 0.7;
    line-height: 1.5;
    max-width: 600px;
    margin: 0 auto;
}

/* Responsive */
@media (max-width: 640px) {
    .header {
        flex-direction: column;
        gap: 8px;
        padding: 12px 16px;
    }

    .main {
        padding: 20px 8px;
    }

    .page-title {
        font-size: 20px;
    }

    .calendar-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .route-switcher {
        width: 100%;
    }

    .route-btn {
        flex: 1;
        text-align: center;
    }

    .month-nav {
        gap: 12px;
        margin-bottom: 12px;
    }

    .month-label {
        font-size: 16px;
        min-width: 160px;
    }

    /* Calendar grid — tight fit for 7 columns */
    .calendar-grid {
        gap: 2px;
    }

    .cal-weekday {
        font-size: 11px;
        padding: 4px 2px;
    }

    .cal-cell {
        min-height: 54px;
        padding: 3px;
        border-radius: 6px;
    }

    .cal-cell__day {
        font-size: 13px;
        margin-bottom: 2px;
    }

    .cal-cell__price {
        font-size: 12px;
    }

    .price-arrow {
        font-size: 11px;
    }

    .cal-cell__count {
        font-size: 8px;
        padding: 0px 3px;
        right: 3px;
        bottom: 2px;
    }

    .legend {
        gap: 10px;
        font-size: 12px;
        margin-bottom: 16px;
    }

    /* Modal — bottom sheet on mobile */
    .modal-overlay--open {
        align-items: flex-end;
    }

    .modal {
        width: 100%;
        max-width: 100%;
        max-height: 90vh;
        border-radius: 12px 12px 0 0;
    }

    .modal__header {
        padding: 16px 16px 10px;
    }

    .modal__title {
        font-size: 15px;
    }

    .modal__body {
        padding: 12px 12px 20px;
    }

    /* Flight card — stack vertically on mobile */
    .flight-card__main {
        flex-wrap: wrap;
        padding: 12px;
        gap: 8px;
    }

    .flight-card__info {
        width: 100%;
    }

    .flight-card__right {
        width: 100%;
        justify-content: space-between;
    }

    .flight-card__price {
        font-size: 16px;
    }

    .flight-card__buy {
        padding: 8px 16px;
        font-size: 13px;
    }

    .flight-card__hist-toggle {
        padding: 6px 12px;
        font-size: 11px;
    }

    .flight-card__hist-body {
        padding: 8px 12px 12px;
    }

    .history-table {
        font-size: 12px;
    }

    .history-table thead th {
        padding: 4px 4px;
        font-size: 11px;
    }

    .history-table tbody td {
        padding: 4px 4px;
    }

    /* Index page — route cards */
    .route-cards {
        grid-template-columns: 1fr;
    }

    .route-card {
        padding: 20px;
    }

    .route-card__price {
        font-size: 24px;
    }

    /* Footer */
    .footer {
        margin-top: 24px;
        padding: 20px 16px;
    }

    .footer__disclaimer {
        font-size: 11px;
    }
}

/* Unavailable flights */
.cal-cell--sold-out {
    opacity: 0.6;
}

.cal-cell__sold-out {
    font-size: 9px;
    font-weight: 600;
    color: var(--price-high);
    background: rgba(248, 113, 113, 0.15);
    border-radius: 3px;
    padding: 1px 4px;
    margin-top: 2px;
    display: inline-block;
}

.flight-card__price--unavailable {
    text-decoration: line-through;
    opacity: 0.5;
}

.flight-card__sold-out {
    display: inline-block;
    padding: 6px 12px;
    background: rgba(248, 113, 113, 0.15);
    color: var(--price-high);
    border-radius: 6px;
    font-size: 12px;
    font-weight: 600;
    white-space: nowrap;
}

.seats-badge {
    display: inline-block;
    padding: 4px 10px;
    border-radius: 5px;
    font-size: 14px;
    font-weight: 700;
    margin-left: 8px;
    vertical-align: middle;
    background: rgba(248, 113, 113, 0.15);
    color: #dc2626;
}

.seats-badge--warning {
    background: rgba(248, 113, 113, 0.12);
    color: #dc2626;
}

.seats-badge--urgent {
    background: rgba(248, 113, 113, 0.2);
    color: #b91c1c;
}

/* Archive badge for past dates in modal */
.modal-archive-badge {
    display: inline-block;
    padding: 2px 8px;
    background: rgba(148, 163, 184, 0.2);
    color: #94a3b8;
    border-radius: 4px;
    font-size: 12px;
    font-weight: 600;
    margin-left: 6px;
    vertical-align: middle;
}

@media (max-width: 640px) {
    .cal-cell__sold-out {
        font-size: 8px;
        padding: 0px 3px;
    }

    .flight-card__sold-out {
        padding: 6px 12px;
        font-size: 11px;
    }
}