/* ===== Reset & Base ===== */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --bg: #0f0f14;
    --bg-card: #1a1a24;
    --bg-hover: #22223a;
    --bg-selected: #2d1f5e;
    --border: #2a2a3d;
    --text: #e8e6f0;
    --text-dim: #8886a0;
    --text-muted: #55536b;
    --accent: #a78bfa;
    --accent-dim: #7c5fcf;
    --good: #34d399;
    --good-bg: rgba(52, 211, 153, 0.1);
    --bad: #f87171;
    --bad-bg: rgba(248, 113, 113, 0.1);
    --gold: #fbbf24;
    --gold-bg: rgba(251, 191, 36, 0.1);
    --sunday: #f87171;
    --saturday: #60a5fa;
    --radius: 10px;
    --radius-lg: 16px;
}

html {
    font-size: 15px;
}

body {
    font-family: 'Be Vietnam Pro', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.5;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
}

/* ===== App Layout ===== */
.app {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 16px;
}

/* ===== Header ===== */
.header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(15, 15, 20, 0.85);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
    padding: 12px 0;
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    flex-wrap: wrap;
}

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

.logo-icon {
    font-size: 1.4rem;
    color: var(--accent);
}

.logo h1 {
    font-size: 1.2rem;
    font-weight: 600;
    letter-spacing: -0.02em;
}

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

.header-nav {
    display: flex;
    align-items: center;
    gap: 12px;
}

.month-nav {
    display: flex;
    align-items: center;
    gap: 6px;
}

.nav-btn {
    width: 34px;
    height: 34px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--bg-card);
    color: var(--text);
    font-size: 1.3rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.15s;
}

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

.month-selector {
    display: flex;
    gap: 4px;
}

.month-selector select {
    background: var(--bg-card);
    color: var(--text);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 6px 10px;
    font-family: inherit;
    font-size: 0.87rem;
    cursor: pointer;
    outline: none;
}

.month-selector select:focus {
    border-color: var(--accent);
}

.today-btn {
    background: var(--accent-dim);
    color: #fff;
    border: none;
    border-radius: var(--radius);
    padding: 7px 16px;
    font-family: inherit;
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.15s;
}

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

/* ===== Main Layout ===== */
.main {
    display: grid;
    grid-template-columns: 1fr 380px;
    gap: 20px;
    padding: 20px 0 40px;
    align-items: start;
}

/* ===== Calendar ===== */
.calendar-section {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border);
    padding: 16px;
    overflow: hidden;
}

.weekday-header {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 2px;
    margin-bottom: 6px;
}

.weekday {
    text-align: center;
    font-size: 0.78rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--text-dim);
    padding: 8px 0;
}

.weekday.sun { color: var(--sunday); }
.weekday.sat { color: var(--saturday); }

.calendar-grid {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 2px;
}

.cal-cell {
    aspect-ratio: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius);
    cursor: pointer;
    transition: all 0.15s;
    position: relative;
    gap: 2px;
    min-height: 64px;
}

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

.cal-cell.other-month {
    opacity: 0.3;
}

.cal-cell.today {
    background: var(--bg-hover);
    box-shadow: inset 0 0 0 2px var(--accent);
}

.cal-cell.selected {
    background: var(--bg-selected);
    box-shadow: inset 0 0 0 2px var(--accent);
}

.cal-cell.today.selected {
    background: var(--bg-selected);
    box-shadow: inset 0 0 0 2px var(--gold);
}

.cal-solar {
    font-size: 1.05rem;
    font-weight: 600;
    line-height: 1;
}

.cal-lunar {
    font-size: 0.68rem;
    color: var(--text-dim);
    line-height: 1;
}

.cal-cell.sunday .cal-solar { color: var(--sunday); }
.cal-cell.saturday .cal-solar { color: var(--saturday); }

.cal-cell .lunar-month-label {
    color: var(--accent);
    font-weight: 500;
}

.cal-cell .day-quality {
    position: absolute;
    bottom: 4px;
    width: 5px;
    height: 5px;
    border-radius: 50%;
}

.day-quality.good { background: var(--good); }
.day-quality.bad { background: var(--bad); }
.day-quality.neutral { background: var(--text-muted); }

/* ===== Day Detail Panel ===== */
.day-detail {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border);
    padding: 20px;
    position: sticky;
    top: 80px;
    max-height: calc(100vh - 100px);
    overflow-y: auto;
}

.day-detail::-webkit-scrollbar {
    width: 4px;
}

.day-detail::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 4px;
}

.detail-header {
    margin-bottom: 20px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--border);
}

.detail-date {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 12px;
}

.solar-date {
    display: flex;
    align-items: center;
    gap: 10px;
}

.big-day {
    font-size: 3rem;
    font-weight: 700;
    line-height: 1;
    color: var(--accent);
}

.date-meta {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.date-meta span:first-child {
    font-size: 0.9rem;
    font-weight: 500;
}

.date-meta span:last-child {
    font-size: 0.8rem;
    color: var(--text-dim);
}

.lunar-date-box {
    text-align: right;
}

.lunar-full {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--gold);
}

.lunar-year {
    font-size: 0.82rem;
    color: var(--text-dim);
    margin-top: 2px;
}

/* ===== Detail Sections ===== */
.detail-section {
    margin-bottom: 18px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--border);
}

.detail-section:last-child {
    border-bottom: none;
    margin-bottom: 0;
    padding-bottom: 0;
}

.section-title {
    font-size: 0.78rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--text-dim);
    margin-bottom: 10px;
}

.section-title.mt {
    margin-top: 14px;
}

/* Can Chi */
.canchi-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 8px;
}

.canchi-item {
    background: var(--bg);
    border-radius: var(--radius);
    padding: 10px;
    text-align: center;
}

.canchi-label {
    display: block;
    font-size: 0.72rem;
    color: var(--text-muted);
    margin-bottom: 4px;
}

.canchi-value {
    display: block;
    font-size: 0.88rem;
    font-weight: 600;
    color: var(--accent);
}

/* Hours Grid */
.hours-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 6px;
}

.hour-item {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 10px;
    border-radius: var(--radius);
    font-size: 0.82rem;
}

.hour-item.good-hour {
    background: var(--good-bg);
    border: 1px solid rgba(52, 211, 153, 0.2);
}

.hour-item.bad-hour {
    background: rgba(30, 30, 45, 0.5);
    border: 1px solid var(--border);
    color: var(--text-muted);
}

.hour-name {
    font-weight: 600;
}

.hour-time {
    font-size: 0.72rem;
    color: var(--text-dim);
}

.hour-item.good-hour .hour-name {
    color: var(--good);
}

/* Stars */
.stars-list {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.star-tag {
    padding: 4px 10px;
    border-radius: 20px;
    font-size: 0.78rem;
    font-weight: 500;
}

.stars-list.good .star-tag {
    background: var(--good-bg);
    color: var(--good);
    border: 1px solid rgba(52, 211, 153, 0.2);
}

.stars-list.bad .star-tag {
    background: var(--bad-bg);
    color: var(--bad);
    border: 1px solid rgba(248, 113, 113, 0.2);
}

/* Star 28 */
.star28-box {
    background: var(--gold-bg);
    border: 1px solid rgba(251, 191, 36, 0.2);
    border-radius: var(--radius);
    padding: 12px;
}

.star28-name {
    font-size: 1rem;
    font-weight: 600;
    color: var(--gold);
    margin-bottom: 4px;
}

.star28-meaning {
    font-size: 0.82rem;
    color: var(--text-dim);
    line-height: 1.5;
}

.star28-quality {
    display: inline-block;
    padding: 2px 8px;
    border-radius: 10px;
    font-size: 0.72rem;
    font-weight: 600;
    margin-left: 6px;
}

.star28-quality.good {
    background: var(--good-bg);
    color: var(--good);
}

.star28-quality.bad {
    background: var(--bad-bg);
    color: var(--bad);
}

/* Advice */
.advice-columns {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}

.advice-col h3 {
    margin-bottom: 8px;
}

.advice-col.good .section-title {
    color: var(--good);
}

.advice-col.bad .section-title {
    color: var(--bad);
}

.advice-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.advice-list li {
    font-size: 0.82rem;
    color: var(--text-dim);
    padding: 3px 0;
}

.advice-col.good .advice-list li::before {
    content: "• ";
    color: var(--good);
}

.advice-col.bad .advice-list li::before {
    content: "• ";
    color: var(--bad);
}

/* Extra grid */
.extra-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
}

.extra-item {
    background: var(--bg);
    border-radius: var(--radius);
    padding: 10px;
    text-align: center;
}

.extra-label {
    display: block;
    font-size: 0.72rem;
    color: var(--text-muted);
    margin-bottom: 4px;
}

.extra-value {
    display: block;
    font-size: 0.88rem;
    font-weight: 600;
}

/* ===== Responsive ===== */
@media (max-width: 900px) {
    .main {
        grid-template-columns: 1fr;
    }

    .day-detail {
        position: static;
        max-height: none;
    }

    .cal-cell {
        min-height: 52px;
    }

    .cal-solar {
        font-size: 0.95rem;
    }

    .cal-lunar {
        font-size: 0.62rem;
    }
}

@media (max-width: 500px) {
    html {
        font-size: 14px;
    }

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

    .calendar-section {
        padding: 10px;
    }

    .cal-cell {
        min-height: 44px;
        aspect-ratio: auto;
    }

    .big-day {
        font-size: 2.4rem;
    }

    .hours-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .canchi-grid {
        grid-template-columns: repeat(3, 1fr);
    }

    .advice-columns {
        grid-template-columns: 1fr;
    }

    .detail-date {
        flex-direction: column;
    }

    .lunar-date-box {
        text-align: left;
    }
}