:root {
    --bg-color: #0b0d17;
    --accent-color: #c9a063;
    --text-color: #f0ede5;
    --card-shadow: 0 10px 30px rgba(0, 0, 0, 0.7);
    --gold-glow: 0 0 15px rgba(201, 160, 99, 0.5);
    /* Transition speeds */
    --transition-fast: 0.3s;
    --transition-slow: 0.8s;
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: 'Noto Serif SC', serif;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    overflow-x: hidden;
    /* Use a simple gradient until the user provides a background */
    background: radial-gradient(circle at center, #1a1e2b 0%, #0b0d17 100%);
}

.background-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url('https://www.transparenttextures.com/patterns/stardust.png');
    pointer-events: none;
    opacity: 0.3;
}

header {
    text-align: center;
    margin-top: 6rem; /* 增加顶部留白 */
    margin-bottom: 3rem;
    z-index: 10;
}

h1 {
    font-size: 3.5rem;
    font-family: 'Ma Shan Zheng', cursive;
    color: var(--accent-color);
    margin-bottom: 0.5rem;
    text-shadow: 0 0 10px rgba(201, 160, 99, 0.3);
}

.subtitle {
    font-size: 1rem;
    color: #94a3b8;
    letter-spacing: 2px;
}

main {
    width: 100%;
    max-width: 1200px;
    padding: 1rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    z-index: 10;
}

.card-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2rem;
    margin-bottom: 3rem;
    width: 100%;
}

.cards-line {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    width: 100%;
    margin-bottom: 2rem;
}

.info-section {
    display: flex;
    flex-direction: row; /* Desktop: Side-by-side */
    gap: 1.5rem;
    width: 100%;
    max-width: 1100px;
}

/* Card Styling - Desktop Default (LARGE) */
.card-wrapper-mini {
    width: 260px;
    perspective: 1000px;
    transition: width 0.3s ease;
}

.card.mini {
    position: relative;
    width: 100%;
    height: 420px;
    transform-style: preserve-3d;
    transition: transform 0.8s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.card.is-drawn {
    transform: rotateY(180deg);
}

.card-face {
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    border-radius: 8px;
    border: 1px solid var(--accent-color);
    box-shadow: var(--card-shadow);
    overflow: hidden;
}

.card-back {
    background: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
    display: flex;
    justify-content: center;
    align-items: center;
}

.card-back::after {
    content: "🔮";
    font-size: 3.5rem; /* Large desktop icon */
    opacity: 0.5;
    transition: font-size 0.3s ease;
}

.card-front {
    transform: rotateY(180deg);
    background: #000;
}

.card-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.card-img.reversed {
    transform: rotate(180deg);
}

/* Large Info Styling */
.card-info-summary {
    flex: 1; /* Share row equally */
    background: rgba(30, 41, 59, 0.4);
    backdrop-filter: blur(8px);
    border-radius: 12px;
    padding: 1.5rem;
    border-top: 4px solid var(--accent-color); /* Top border looks better in row */
    opacity: 0;
    transform: translateY(10px);
    transition: all 0.6s ease-out;
}

.card-info-summary.visible {
    opacity: 1;
    transform: translateY(0);
}

.card-label {
    font-size: 0.9rem;
    color: #94a3b8;
    margin-bottom: 0.3rem;
    text-transform: uppercase;
    letter-spacing: 2px;
}

.card-name {
    font-family: 'Ma Shan Zheng', cursive;
    font-size: 1.8rem;
    color: var(--accent-color);
    margin-bottom: 0.8rem;
}

.card-meaning-large {
    font-size: 1.05rem;
    color: #e2e8f0;
    line-height: 1.6;
}

/* Controls */
.controls {
    display: flex;
    gap: 1.5rem;
}

button {
    padding: 1rem 2.5rem;
    font-size: 1.1rem;
    font-family: 'Noto Serif SC', serif;
    border-radius: 50px;
    cursor: pointer;
    transition: all var(--transition-fast);
    border: none;
    outline: none;
}

.glow-on-hover {
    background: var(--accent-color);
    color: #000;
    font-weight: bold;
    box-shadow: var(--gold-glow);
}

.glow-on-hover:hover {
    transform: translateY(-3px);
    box-shadow: 0 0 25px var(--accent-color);
}

.secondary-btn {
    background: transparent;
    color: var(--accent-color);
    border: 1px solid var(--accent-color);
}

.secondary-btn:hover {
    background: rgba(201, 160, 99, 0.1);
}

/* Empty placeholder */
.placeholder {
    width: 100%;
    display: flex;
    justify-content: center;
    opacity: 0.3;
    font-style: italic;
}

/* Quick Animation for fade in */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.card-wrapper {
    animation: fadeIn 0.5s ease-out forwards;
}

/* Responsiveness */
.ai-prompt-container {
    margin-top: 4rem;
    width: 100%;
    max-width: 800px;
    background: rgba(15, 23, 42, 0.6);
    border: 1px solid rgba(201, 160, 99, 0.3);
    border-radius: 16px;
    padding: 2rem;
    text-align: center;
    backdrop-filter: blur(10px);
    animation: fadeIn 1s ease-out;
}

.ai-prompt-container h3 {
    margin-bottom: 1.5rem;
    font-family: 'Ma Shan Zheng', cursive;
    color: var(--accent-color);
    font-size: 1.8rem;
}

#ai-prompt-text {
    width: 100%;
    height: 180px;
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: #e2e8f0;
    padding: 1.5rem;
    border-radius: 8px;
    font-family: inherit;
    font-size: 1rem;
    line-height: 1.6;
    resize: none;
    margin-bottom: 1.5rem;
    outline: none;
    transition: border-color 0.3s;
}

#ai-prompt-text:focus {
    border-color: var(--accent-color);
}

.ai-actions {
    display: flex;
    justify-content: center;
    gap: 1.2rem;
}

.action-btn {
    padding: 0.8rem 1.8rem;
    border-radius: 8px;
    border: none;
    cursor: pointer;
    font-weight: 500;
    transition: all 0.3s;
    text-decoration: none;
    display: inline-block;
    font-size: 0.95rem;
}

#copy-btn {
    background: var(--accent-color);
    color: #000;
}

#copy-btn:hover {
    filter: brightness(1.1);
    transform: translateY(-2px);
}

.action-btn.secondary.gemini {
    background: #4285F4;
    color: white;
}

.action-btn.secondary.deepseek {
    background: #4d6cfa;
    color: white;
}

.action-btn.secondary:hover {
    filter: brightness(1.2);
    transform: translateY(-2px);
}

/* Responsiveness */
@media (max-width: 1024px) {
    .card-wrapper-mini { width: 220px; }
    .card.mini { height: 350px; }
}

@media (max-width: 768px) {
    h1 { font-size: 2.5rem; }
    .subtitle { font-size: 0.85rem; padding: 0 1.5rem; }
    .cards-line { gap: 1rem; }
    .card-wrapper-mini { width: 140px; }
    .card.mini { height: 220px; }
    .card-back::after { font-size: 2rem; }
    
    .info-section { flex-direction: column; } /* Mobile: Vertical stack */
    .card-info-summary { border-top-width: 0; border-left: 4px solid var(--accent-color); }
    
    .ai-prompt-container { width: 95%; padding: 1.2rem; }
}

@media (max-width: 480px) {
    header { margin-top: 3rem; } /* 移动端顶部留白稍作收缩 */
    h1 { font-size: 2rem; }
    .cards-line { gap: 0.5rem; margin-bottom: 2rem; }
    .card-wrapper-mini { width: 30vw; } /* 满屏宽度的三分之一左右 */
    .card.mini { height: 160px; }
    .card-back::after { font-size: 1.2rem; }
    
    .card-info-summary { padding: 1.2rem; border-left-width: 3px; }
    .card-name { font-size: 1.4rem; }
    .card-meaning-large { font-size: 0.95rem; }

    .controls { flex-direction: column; width: 90%; gap: 1rem; }
    button { width: 100%; padding: 0.8rem; }
    
    .ai-actions { flex-direction: column; width: 100%; }
    .ai-actions .action-btn { width: 100%; margin-bottom: 0.5rem; }
}