:root {
    --bg: #09090b;
    --surface: #141416;
    --surface-raised: #1c1c1f;
    --border: rgba(255, 255, 255, 0.06);
    --border-hover: rgba(255, 255, 255, 0.12);
    --accent: #c9a96e;
    --accent-dim: rgba(201, 169, 110, 0.15);
    --accent-glow: rgba(201, 169, 110, 0.08);
    --text: #fafaf9;
    --text-secondary: #a1a1aa;
    --text-tertiary: #71717a;
    --font-display: 'Bodoni Moda', 'Noto Serif SC', 'Noto Serif TC', serif;
    --font-reading: 'Literata', 'Noto Serif SC', 'Noto Serif TC', Georgia, serif;
    --font-ui: 'Outfit', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
    --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
}

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

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

html {
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-ui);
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    min-height: 100dvh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 32px 24px;
    position: relative;
    overflow-x: hidden;
}

/* Subtle radial warmth behind the card area */
body::before {
    content: '';
    position: fixed;
    top: 40%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 800px;
    height: 800px;
    background: radial-gradient(circle, rgba(201, 169, 110, 0.04) 0%, transparent 70%);
    pointer-events: none;
    z-index: 0;
}

/* Noise texture overlay */
body::after {
    content: '';
    position: fixed;
    inset: 0;
    background: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.03'/%3E%3C/svg%3E");
    background-size: 256px;
    pointer-events: none;
    z-index: 0;
    opacity: 0.5;
}

/* ── Layout ── */

.container {
    position: relative;
    z-index: 1;
    width: 100%;
    max-width: 440px;
    display: flex;
    flex-direction: column;
    align-items: center;
}

/* ── Language selector ── */

.lang-selector {
    display: inline-flex;
    margin-bottom: 16px;
    position: relative;
}

.lang-selector select {
    appearance: none;
    -webkit-appearance: none;
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text-secondary);
    padding: 6px 28px 6px 12px;
    font-size: 0.75rem;
    font-family: var(--font-ui);
    font-weight: 400;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    border-radius: 6px;
    cursor: pointer;
    transition: color 0.3s, border-color 0.3s;
    outline: none;
}

.lang-selector select:hover,
.lang-selector select:focus {
    color: var(--text);
    border-color: var(--border-hover);
}

.lang-selector::after {
    content: '';
    position: absolute;
    right: 10px;
    top: 50%;
    transform: translateY(-50%);
    width: 0;
    height: 0;
    border-left: 3.5px solid transparent;
    border-right: 3.5px solid transparent;
    border-top: 3.5px solid var(--text-secondary);
    pointer-events: none;
}

/* ── Title ── */

.title-group {
    text-align: center;
    margin-bottom: 56px;
    opacity: 0;
    animation: fadeUp 0.8s var(--ease-out) 0.1s forwards;
}

h1 {
    font-family: var(--font-display);
    font-size: clamp(2.2rem, 7vw, 3.4rem);
    font-weight: 400;
    letter-spacing: 0.03em;
    line-height: 1.1;
    color: var(--text);
}

.subtitle {
    font-family: var(--font-ui);
    font-size: 0.7rem;
    font-weight: 400;
    letter-spacing: 0.25em;
    text-transform: uppercase;
    color: var(--text-secondary);
    margin-top: 14px;
}

/* ── Ornament ── */

.ornament {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 48px;
    opacity: 0;
    animation: fadeUp 0.8s var(--ease-out) 0.25s forwards;
}

.ornament-line {
    width: 48px;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--accent), transparent);
    opacity: 0.4;
}

.ornament-diamond {
    width: 6px;
    height: 6px;
    background: var(--accent);
    transform: rotate(45deg);
    opacity: 0.5;
}

/* ── Card ── */

.card-container {
    width: 100%;
    opacity: 0;
    animation: fadeUp 0.8s var(--ease-out) 0.4s forwards;
}

.card {
    width: 100%;
    min-height: 260px;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 56px 40px;
    border-radius: 16px;
    background: var(--surface);
    border: 1px solid var(--border);
    position: relative;
    overflow: hidden;
    text-align: center;
    transition: border-color 0.4s;
}

.card::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(ellipse at 50% 0%, var(--accent-glow) 0%, transparent 60%);
    opacity: 0;
    transition: opacity 0.6s;
    pointer-events: none;
}

.card.revealed::before {
    opacity: 1;
}

.card.revealed {
    border-color: rgba(201, 169, 110, 0.12);
}

/* Card states */

.card-prompt {
    font-family: var(--font-reading);
    font-size: clamp(1rem, 2.8vw, 1.15rem);
    line-height: 1.8;
    color: var(--text-secondary);
    transition: opacity 0.35s, transform 0.35s var(--ease-out);
}

.card-answer {
    font-family: var(--font-reading);
    font-size: clamp(1.5rem, 5vw, 2rem);
    font-weight: 500;
    line-height: 1.45;
    color: var(--text);
    letter-spacing: 0.01em;
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 56px 40px;
    opacity: 0;
    transform: scale(0.96);
    transition: opacity 0.5s 0.1s, transform 0.5s var(--ease-out) 0.1s;
}

.card.revealing .card-prompt {
    opacity: 0;
    transform: scale(0.97);
}

.card.revealed .card-prompt {
    opacity: 0;
    transform: scale(0.97);
    pointer-events: none;
}

.card.revealed .card-answer {
    opacity: 1;
    transform: scale(1);
}

/* Answer decorative lines */
.card-answer::before,
.card-answer::after {
    content: '';
    width: 40px;
    height: 1px;
    background: var(--accent);
    opacity: 0.3;
    flex-shrink: 0;
}

.card-answer::before {
    margin-bottom: 24px;
}

.card-answer::after {
    margin-top: 24px;
}

.card-answer-text {
    display: block;
}

/* Loading state */
.card-loading {
    font-family: var(--font-reading);
    font-size: 1rem;
    color: var(--text-tertiary);
    font-style: italic;
}

.loading-dots::after {
    content: '';
    display: inline-block;
    width: 1.2em;
    text-align: left;
    animation: dots 1.2s steps(3, end) infinite;
}

@keyframes dots {
    0%   { content: ''; }
    33%  { content: '.'; }
    66%  { content: '..'; }
    100% { content: '...'; }
}

/* ── Buttons ── */

.button-group {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    justify-content: center;
    margin-top: 40px;
    opacity: 0;
    animation: fadeUp 0.8s var(--ease-out) 0.55s forwards;
}

button {
    font-family: var(--font-ui);
    font-size: 0.85rem;
    font-weight: 500;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.25s var(--ease-out);
    outline: none;
    position: relative;
    -webkit-tap-highlight-color: transparent;
}

button:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 3px;
}

.btn-primary {
    padding: 16px 44px;
    background: var(--accent);
    color: var(--bg);
    font-weight: 600;
}

.btn-primary:hover {
    background: #d4b47e;
}

.btn-primary:active {
    transform: scale(0.97);
}

.btn-secondary {
    padding: 16px 32px;
    background: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--border);
}

.btn-secondary:hover {
    color: var(--text);
    border-color: var(--border-hover);
    background: rgba(255, 255, 255, 0.03);
}

.btn-secondary:active {
    transform: scale(0.97);
}

button:disabled {
    opacity: 0.4;
    cursor: not-allowed;
    transform: none !important;
}

.hidden {
    display: none !important;
}

/* ── Toast ── */

.toast {
    position: fixed;
    bottom: 32px;
    left: 50%;
    transform: translateX(-50%) translateY(20px);
    background: var(--surface-raised);
    color: var(--text);
    padding: 14px 24px;
    border-radius: 10px;
    font-size: 0.85rem;
    font-weight: 400;
    letter-spacing: 0.02em;
    border: 1px solid var(--border);
    box-shadow: 0 16px 48px rgba(0, 0, 0, 0.5);
    z-index: 100;
    opacity: 0;
    transition: all 0.4s var(--ease-out);
    pointer-events: none;
    white-space: nowrap;
}

.toast.show {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

/* ── History ── */

.history-section {
    width: 100%;
    margin-top: 32px;
    opacity: 0;
    animation: fadeUp 0.8s var(--ease-out) 0.7s forwards;
}

.history-toggle {
    background: none;
    border: none;
    color: var(--text-tertiary);
    font-size: 0.7rem;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    cursor: pointer;
    padding: 10px 0;
    display: flex;
    align-items: center;
    gap: 8px;
    margin: 0 auto;
    font-family: var(--font-ui);
    transition: color 0.3s;
    box-shadow: none;
}

.history-toggle:hover {
    color: var(--text-secondary);
    background: none;
    transform: none;
}

.history-toggle .arrow {
    display: inline-block;
    transition: transform 0.4s var(--ease-out);
    font-size: 0.6rem;
}

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

.history-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 6px;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.5s var(--ease-out), opacity 0.4s;
    opacity: 0;
}

.history-list.open {
    max-height: 500px;
    opacity: 1;
    padding-top: 12px;
}

.history-item {
    background: transparent;
    border-bottom: 1px solid var(--border);
    border-radius: 0;
    padding: 12px 0;
    font-family: var(--font-reading);
    font-size: 0.9rem;
    color: var(--text-tertiary);
    text-align: center;
    animation: fadeIn 0.3s ease;
}

.history-item:last-child {
    border-bottom: none;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

/* ── Footer ── */

footer {
    position: relative;
    z-index: 1;
    margin-top: 56px;
    font-size: 0.7rem;
    color: var(--text-secondary);
    text-align: center;
    letter-spacing: 0.04em;
}

footer a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.3s;
}

footer a:hover {
    color: var(--accent);
}

/* ── Entrance animation ── */

@keyframes fadeUp {
    from {
        opacity: 0;
        transform: translateY(16px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ── Responsive ── */

@media (max-width: 480px) {
    body {
        padding: 24px 20px;
    }

    .title-group {
        margin-bottom: 40px;
    }

    .ornament {
        margin-bottom: 36px;
    }

    .card {
        min-height: 230px;
        padding: 44px 28px;
    }

    .card-answer {
        padding: 44px 28px;
    }

    .button-group {
        margin-top: 32px;
        width: 100%;
    }

    .button-group button {
        flex: 1;
        min-width: 0;
    }

}

@media (max-width: 360px) {
    .card {
        min-height: 210px;
        padding: 36px 24px;
    }

    .card-answer {
        padding: 36px 24px;
    }
}