/* ============================================
   玄学择日 — 水墨中国风 Design System
   Guided by ui-ux-pro-max skill rules
   ============================================ */

@import url('https://fonts.googleapis.com/css2?family=Noto+Serif+SC:wght@300;400;500;600;700&family=ZCOOL+XiaoWei&display=swap');

/* ── Design Tokens ── */
:root {
    /* Color Palette: Ink-Wash Chinese */
    --ink-900: #1a1a1a;       /* 浓墨 Deep Ink */
    --ink-700: #3d3d3d;       /* 次墨 */
    --ink-500: #666666;       /* 淡墨 */
    --ink-300: #999999;       /* 薄墨 */
    --ink-100: #d4d0c8;       /* 灰纹 */
    --ink-50:  #e8e4db;       /* 微纹 */

    --paper:   #f5f0e8;       /* 宣纸 Rice Paper */
    --paper-warm: #faf6ee;    /* 暖宣 Warm Paper */
    --white:   #ffffff;

    --cinnabar: #c53929;      /* 朱砂 Cinnabar */
    --cinnabar-light: #e8564a; /* 浅朱 */
    --cinnabar-bg: rgba(197, 57, 41, 0.06); /* 朱晕 */

    --gold-accent: #b8860b;   /* 暗金 Antique Gold */
    --jade: #2e8b57;          /* 碧玉 Jade */

    /* Semantic tokens (ui-ux-pro-max: color-semantic) */
    --color-primary: var(--cinnabar);
    --color-surface: var(--white);
    --color-background: var(--paper);
    --color-on-surface: var(--ink-900);
    --color-secondary-text: var(--ink-500);
    --color-border: var(--ink-100);
    --color-divider: var(--ink-50);
    --color-active-bg: var(--cinnabar-bg);

    /* Typography scale (ui-ux-pro-max: font-scale) */
    --fs-xs: 0.75rem;   /* 12px */
    --fs-sm: 0.875rem;  /* 14px */
    --fs-base: 1rem;    /* 16px - readable-font-size */
    --fs-md: 1.125rem;  /* 18px */
    --fs-lg: 1.5rem;    /* 24px */
    --fs-xl: 2rem;      /* 32px */

    /* Spacing scale: 4/8dp system (ui-ux-pro-max: spacing-scale) */
    --sp-1: 4px;
    --sp-2: 8px;
    --sp-3: 12px;
    --sp-4: 16px;
    --sp-5: 24px;
    --sp-6: 32px;
    --sp-8: 48px;

    /* Radius */
    --radius-sm: 2px;
    --radius-md: 4px;
    --radius-lg: 8px;

    /* Animation (ui-ux-pro-max: duration-timing 150-300ms) */
    --transition-fast: 150ms ease-out;
    --transition-normal: 250ms ease-out;
    --transition-slow: 400ms ease-out;
}

/* ── Base Reset ── */
*,
*::before,
*::after {
    box-sizing: border-box;
}

/* ── Body ── */
body {
    margin: 0;
    /* font-pairing: ZCOOL XiaoWei (display) + Noto Serif SC (body) */
    font-family: 'Noto Serif SC', 'Songti SC', 'STSong', 'SimSun', serif;
    font-size: var(--fs-base);     /* readable-font-size: min 16px */
    line-height: 1.6;             /* line-height: 1.5-1.75 */
    color: var(--color-on-surface);
    background-color: var(--color-background);
    /* Subtle ink-wash texture */
    background-image:
        radial-gradient(ellipse at 15% 10%, rgba(0,0,0,0.025) 0%, transparent 60%),
        radial-gradient(ellipse at 85% 90%, rgba(0,0,0,0.02) 0%, transparent 50%);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    padding: var(--sp-8) var(--sp-4);
    -webkit-font-smoothing: antialiased;
}

/* ── Container ── */
.container {
    max-width: 820px;             /* container-width */
    width: 100%;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--sp-8) var(--sp-6);
    box-shadow:
        0 1px 3px rgba(0,0,0,0.04),
        0 8px 24px rgba(0,0,0,0.03);
}

/* ── Title ── */
h1 {
    font-family: 'Noto Serif SC', serif;
    font-weight: 300;
    text-align: center;
    font-size: var(--fs-xl);
    letter-spacing: 6px;
    text-indent: 6px;
    color: var(--ink-700);
    margin: 0 auto var(--sp-6);
    width: max-content;
    position: relative;
    padding-bottom: var(--sp-4);
}

h1::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background: var(--color-primary);
    opacity: 0.7;
}
.subtitle {
    text-align: center;
    font-size: var(--fs-base);
    color: var(--ink-500);
    margin-top: calc(-1 * var(--sp-4));
    margin-bottom: var(--sp-6);
    letter-spacing: 2px;
    font-weight: 300;
    font-family: 'Noto Serif SC', serif;
}


/* ── Input Section ── */
.input-section {
    display: flex;
    flex-direction: column;
    gap: var(--sp-5);
}

.input-row {
    display: flex;
    gap: var(--sp-5);
    align-items: stretch;
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: var(--sp-2);
}

/* ── Labels ── */
label {
    font-size: var(--fs-sm);
    color: var(--color-secondary-text);
    font-weight: 500;
    letter-spacing: 1px;
}

/* ── Inputs & Selects ── */
input, select, option {
    font-variant-numeric: tabular-nums;
    font-feature-settings: "tnum";
    background: var(--paper-warm);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--sp-3) var(--sp-4);
    color: var(--color-on-surface);
    font-size: var(--fs-base);
    font-family: inherit;
    outline: none;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
    /* touch-target: min 44px */
    min-height: 44px;
}

input:focus, select:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 2px rgba(197, 57, 41, 0.1);
}

/* ── Primary Action Button ── */
#calculateBtn {
    background: var(--color-primary);
    color: var(--white);
    border: none;
    border-radius: var(--radius-md);
    padding: var(--sp-4);
    font-size: var(--fs-md);
    font-weight: 500;
    font-family: inherit;
    letter-spacing: 3px;
    cursor: pointer;
    transition: opacity var(--transition-fast), transform var(--transition-fast);
    margin-top: var(--sp-2);
    width: 100%;
    min-height: 48px;   /* touch-target-size */
}

#calculateBtn:hover {
    opacity: 0.88;
}

#calculateBtn:active {
    transform: scale(0.995);  /* scale-feedback: subtle press */
}

/* ── Results ── */
.results {
    margin-top: var(--sp-8);
    display: flex;
    flex-direction: column;
    gap: var(--sp-5);
}

/* ── Day Card ── */
.day-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--sp-5);
    position: relative;
    /* stagger-sequence: 30-50ms per item */
    animation: cardEnter 0.4s ease-out forwards;
    opacity: 0;
}

.day-card::before {
    content: '';
    position: absolute;
    left: 0;
    top: 12px;
    bottom: 12px;
    width: 3px;
    background: var(--color-primary);
    border-radius: 2px;
    opacity: 0.7;
}

@keyframes cardEnter {
    from {
        opacity: 0;
        transform: translateY(12px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ── Day Header ── */
.day-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--sp-3);
    padding-bottom: var(--sp-3);
    border-bottom: 1px dashed var(--color-divider);
}

.date-text {
    /* Removed ZCOOL XiaoWei for unified font */
    font-size: var(--fs-lg);
    font-weight: 400;
    color: var(--color-primary);
    letter-spacing: 1px;
}

.ganzhi {
    font-weight: 500;
    color: var(--ink-700);
    letter-spacing: 1px;
}

.score-badge {
    background: transparent;
    color: var(--gold-accent);
    border: 1px solid var(--gold-accent);
    padding: var(--sp-1) var(--sp-3);
    border-radius: 20px;
    font-size: var(--fs-sm);
    white-space: nowrap;
}

/* ── Reasons ── */
.reasons {
    font-size: var(--fs-sm);
    line-height: 1.8;
    color: var(--ink-700);
}

.reason-tag {
    display: inline-block;
    background: var(--paper);
    border: 1px solid var(--color-divider);
    color: var(--ink-700);
    padding: 2px 10px;
    border-radius: var(--radius-sm);
    margin-right: var(--sp-2);
    margin-top: var(--sp-2);
    font-size: var(--fs-xs);
    letter-spacing: 0.5px;
}

.none-found {
    text-align: center;
    padding: var(--sp-8);
    color: var(--color-secondary-text);
    font-style: italic;
}

/* ── Activity Buttons (13 in a row) ── */
.activity-buttons {
    display: flex;
    flex-wrap: nowrap;
    gap: var(--sp-1);
    width: 100%;
}

.activity-btn {
    background: transparent;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--sp-2) 0;
    color: var(--ink-700);
    font-size: var(--fs-sm);
    font-weight: 400;
    font-family: inherit;
    cursor: pointer;
    transition: all var(--transition-fast);
    flex: 1 1 0;
    text-align: center;
    white-space: nowrap;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 36px;
}

.activity-btn:hover {
    background: var(--paper);
    border-color: var(--ink-300);
}

.activity-btn.active {
    background: var(--color-active-bg);
    border-color: var(--color-primary);
    color: var(--color-primary);
    font-weight: 600;
}

/* ── Range Buttons ── */
.range-buttons {
    display: flex;
    gap: var(--sp-2);
}

.range-btn {
    background: transparent;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--sp-3) var(--sp-4);
    color: var(--ink-700);
    font-size: var(--fs-sm);
    font-weight: 400;
    font-family: inherit;
    cursor: pointer;
    transition: all var(--transition-fast);
    flex: 1;
    text-align: center;
    min-height: 44px;   /* touch-target-size */
    display: flex;
    align-items: center;
    justify-content: center;
}

.range-btn:hover {
    background: var(--paper);
    border-color: var(--ink-300);
}

.range-btn.active {
    background: var(--color-active-bg);
    border-color: var(--color-primary);
    color: var(--color-primary);
    font-weight: 600;
}

/* ── Responsive (ui-ux-pro-max: mobile-first, breakpoint-consistency) ── */
@media (max-width: 768px) {
    body {
        padding: var(--sp-5) var(--sp-3);
    }
    .container {
        padding: var(--sp-5) var(--sp-4);
    }
    h1 {
        font-size: var(--fs-lg);
        letter-spacing: 4px;
    }
    .input-row {
        flex-direction: column;
        gap: var(--sp-4);
    }
}

@media (max-width: 600px) {
    .activity-buttons {
        flex-wrap: wrap;
        gap: var(--sp-2);
    }
    .activity-btn {
        flex: 1 1 calc(25% - 6px);
        font-size: var(--fs-xs);
        padding: var(--sp-2) var(--sp-1);
        min-height: 40px;
    }
    .activity-btn:first-child {
        flex: 1 1 100%;
    }
    .range-buttons {
        flex-wrap: wrap;
    }
    .range-btn {
        flex: 1 1 calc(50% - 4px);
    }
    .date-text {
        font-size: var(--fs-md);
    }
}

/* ── Custom Select (replaces native <select> for alignment control) ── */
.custom-select {
    position: relative;
    width: 100%;
}

.custom-select__trigger {
    background: var(--paper-warm);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--sp-3) var(--sp-4);
    color: var(--color-on-surface);
    font-size: var(--fs-base);
    font-family: inherit;
    min-height: 44px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: space-between;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
    user-select: none;
    box-sizing: border-box;
    height: 100%;
}

.custom-select__trigger:hover {
    border-color: var(--ink-300);
}

.custom-select.open .custom-select__trigger {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 2px rgba(197, 57, 41, 0.1);
}

.custom-select__trigger svg {
    flex-shrink: 0;
    color: var(--ink-300);
    transition: transform var(--transition-fast);
}

.custom-select.open .custom-select__trigger svg {
    transform: rotate(180deg);
}

.custom-select__options {
    display: none;
    position: absolute;
    top: calc(100% + 4px);
    left: 0;
    right: 0;
    background: var(--white);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    box-shadow: 0 4px 16px rgba(0,0,0,0.08);
    z-index: 100;
    max-height: 320px;
    overflow-y: auto;
    padding: var(--sp-1) 0;
}

.custom-select.open .custom-select__options {
    display: block;
    animation: dropdownIn 0.15s ease-out;
}

@keyframes dropdownIn {
    from { opacity: 0; transform: translateY(-4px); }
    to   { opacity: 1; transform: translateY(0); }
}

.custom-select__option {
    padding: var(--sp-2) var(--sp-4);
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: var(--fs-sm);
    color: var(--ink-700);
    transition: background var(--transition-fast);
    min-height: 36px;
    font-family: inherit;
}

.custom-select__option:hover {
    background: var(--paper);
}

.custom-select__option.active {
    color: var(--color-primary);
    background: var(--color-active-bg);
    font-weight: 600;
}

.sz-name {
    flex-shrink: 0;
}

.sz-time {
    font-family: 'SF Mono', 'Menlo', 'Consolas', 'Liberation Mono', monospace;
    font-size: var(--fs-xs);
    color: var(--ink-300);
    letter-spacing: 0;
    text-align: right;
}

/* ── Custom Date Picker ── */
.datepicker-panel {
    display: none;
    position: absolute;
    top: calc(100% + 4px);
    left: 0;
    background: var(--white);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    box-shadow: 0 4px 16px rgba(0,0,0,0.08);
    z-index: 100;
    padding: var(--sp-4);
    width: 100%;
    animation: dropdownIn 0.15s ease-out;
}

.custom-select.open .datepicker-panel {
    display: block;
}

.datepicker-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--sp-3);
    padding-bottom: var(--sp-3);
    border-bottom: 1px solid var(--color-divider);
}

.datepicker-title {
    font-family: 'Noto Serif SC', serif;
    font-size: var(--fs-base);
    font-weight: 500;
    color: var(--ink-700);
    letter-spacing: 1px;
}

.datepicker-nav {
    background: none;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    width: 28px;
    height: 28px;
    cursor: pointer;
    color: var(--ink-500);
    font-size: var(--fs-md);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
    font-family: inherit;
    padding: 0;
    line-height: 1;
}

.datepicker-nav:hover {
    background: var(--paper);
    border-color: var(--ink-300);
    color: var(--ink-700);
}

.datepicker-weekdays {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    text-align: center;
    margin-bottom: var(--sp-2);
}

.datepicker-weekdays span {
    font-size: var(--fs-xs);
    color: var(--ink-300);
    padding: var(--sp-1) 0;
    font-weight: 500;
}

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

.datepicker-day {
    background: none;
    border: none;
    border-radius: var(--radius-sm);
    width: 100%;
    aspect-ratio: 1;
    cursor: pointer;
    font-family: 'SF Mono', 'Menlo', 'Consolas', monospace;
    font-size: var(--fs-sm);
    color: var(--ink-700);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
    padding: 0;
}

.datepicker-day:hover {
    background: var(--paper);
}

.datepicker-day.today {
    border: 1px solid var(--color-primary);
    color: var(--color-primary);
}

.datepicker-day.selected {
    background: var(--color-primary);
    color: var(--white);
    font-weight: 600;
}

.datepicker-day.other-month {
    color: var(--ink-100);
}

@media (max-width: 600px) {
    .datepicker-panel {
        width: calc(100vw - 48px);
        left: 50%;
        transform: translateX(-50%);
    }
}