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

:root {
    --bg-color: #0d0a1f;
    --primary-text: #e6e0ff;
    --accent-gold: #ffdf7e;
    --glow-color: rgba(255, 223, 126, 0.6);
    --border-color: rgba(255, 255, 255, 0.15);
    --glass-bg: rgba(18, 14, 41, 0.5);
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: 'Noto Serif SC', serif;
    background-color: var(--bg-color);
    color: var(--primary-text);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 20px;
    overflow-x: hidden;
}

::selection {
    background: var(--glow-color);
    color: var(--bg-color);
}

#stars-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
}

.container {
    text-align: center;
    padding: 2rem 3rem;
    max-width: 950px;
    width: 100%;
    background: var(--glass-bg);
    border-radius: 20px;
    box-shadow: 0 10px 50px rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(15px);
    border: 1px solid var(--border-color);
    position: relative;
    overflow: hidden;
    transform: translateY(20px);
    opacity: 0;
    animation: fade-in-up 1s ease forwards;
}

.header h1,
.header p,
.card-container {
    opacity: 0;
    transform: translateY(20px);
    animation: fade-in-up 0.8s ease forwards;
}

.header h1 {
    animation-delay: 0.2s;
}

.header p:nth-of-type(1) {
    animation-delay: 0.4s;
}

.header p:nth-of-type(2) {
    animation-delay: 0.6s;
}

.header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--accent-gold);
    text-shadow: 0 0 15px var(--glow-color);
    margin: 0 0 1rem 0;
}

.header p {
    font-size: 1.2rem;
    line-height: 1.7;
    font-weight: 300;
    margin-bottom: 3rem;
}

.tarot-deck {
    display: flex;
    justify-content: center;
    gap: 30px;
    margin-bottom: 3rem;
    flex-wrap: wrap;
}

.card-container {
    width: 180px;
    height: 300px;
    perspective: 1500px;
}

.card-container:nth-child(1) {
    animation-delay: 0.8s;
}

.card-container:nth-child(2) {
    animation-delay: 1.0s;
}

.card-container:nth-child(3) {
    animation-delay: 1.2s;
}

.card {
    width: 100%;
    height: 100%;
    position: relative;
    transform-style: preserve-3d;
    transition: transform 0.8s cubic-bezier(0.25, 1, 0.5, 1);
    cursor: pointer;
}

.card-container:hover .card:not(.flipped) {
    transform: scale(1.05);
}

.card.flipped {
    transform: rotateY(180deg);
    cursor: default;
}

.card-face {
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    border-radius: 15px;
    overflow: hidden;
}

/* --- 全新卡牌背面 --- */
.card-back {
    background-color: #19122f;
    background-image: radial-gradient(circle at 50% 50%, rgba(76, 58, 109, 0.5), transparent 70%),
    url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><style>.cls-1{fill:none;stroke:%23ffdf7e;stroke-linecap:round;stroke-linejoin:round;stroke-width:1.5px;opacity:0.6;}</style></defs><path class="cls-1" d="M72.2,58.5A25,25,0,1,1,90.5,41.2"/><path class="cls-1" d="M27.8,41.5A25,25,0,1,0,9.5,58.8"/><path class="cls-1" d="M41.5,27.8a25,25,0,0,1,17-18.3"/><path class="cls-1" d="M58.5,72.2a25,25,0,0,1-17,18.3"/><path class="cls-1" d="M50,35.4c-2.3,0-4.1-1.8-4.1-4.1s1.8-4.1,4.1-4.1,4.1,1.8,4.1,4.1S52.3,35.4,50,35.4Z"/><path class="cls-1" d="M60.2,40.1c-1.3,1.3-3,2-4.8,2s-3.5-.7-4.8-2c-2.7-2.7-2.7-7,0-9.7"/><path class="cls-1" d="M64.6,50a14.6,14.6,0,0,0-29.2,0c0,8.1,14.6,17.2,14.6,17.2S64.6,58.1,64.6,50Z"/><path class="cls-1" d="M50,61.8A5.4,5.4,0,1,0,44.6,56,5.4,5.4,0,0,0,50,61.8Z"/></svg>');
    background-size: cover, 70%;
    background-position: center, center;
    background-repeat: no-repeat;
    border: 2px solid rgba(255, 223, 126, 0.3);
    box-shadow: inset 0 0 25px rgba(0, 0, 0, 0.6);
    transition: all 0.3s ease;
}

.card-container:hover .card:not(.flipped) .card-back {
    border-color: var(--accent-gold);
    box-shadow: inset 0 0 10px rgba(0, 0, 0, 0.5), 0 0 15px var(--glow-color);
}

.card-front {
    background: linear-gradient(160deg, #3a2256, #2e1c45);
    border: 1px solid rgba(213, 184, 255, 0.3);
    transform: rotateY(180deg);
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: 20px;
    pointer-events: none;
    /* 确保翻开后不再响应鼠标事件 */
}

.card-front h2 {
    color: var(--accent-gold);
    margin: 0 0 15px 0;
    font-size: 1.5rem;
}

.card-front p {
    font-size: 1rem;
    line-height: 1.6;
    font-weight: 300;
    margin: 0;
}

/* --- 星轨之仪 (封印) --- */
.seal-container {
    opacity: 0;
    visibility: hidden;
    transition: opacity 1s ease, visibility 1s;
    margin-top: 1rem;
}

.seal-container.visible {
    opacity: 1;
    visibility: visible;
}

.seal {
    width: 120px;
    height: 120px;
    margin: 0 auto;
    cursor: pointer;
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
    transition: transform 0.5s ease;
}

.seal:hover {
    transform: scale(1.1);
}

.seal-core {
    width: 30%;
    height: 30%;
    background: radial-gradient(circle, #fff, var(--accent-gold));
    border-radius: 50%;
    box-shadow: 0 0 15px var(--accent-gold), 0 0 30px var(--glow-color);
    animation: breathe 2.5s ease-in-out infinite;
}

.seal-ring {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    margin: auto;
    border-radius: 50%;
    border: 1px solid transparent;
    border-top-color: var(--accent-gold);
    mix-blend-mode: screen;
}

.ring-1 {
    width: 100%;
    height: 100%;
    animation: spin-clockwise 8s linear infinite;
}

.ring-2 {
    width: 80%;
    height: 80%;
    border-top-color: #e6e0ff;
    animation: spin-counter-clockwise 12s linear infinite;
}

.ring-3 {
    width: 60%;
    height: 60%;
    animation: spin-clockwise 10s linear infinite;
}

.seal-container p {
    margin-top: 1.5rem;
    font-size: 0.9rem;
    opacity: 0.8;
    letter-spacing: 1px;
}

/* --- 信件模态框 --- */
.letter-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(8px);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.5s ease, visibility 0.5s;
}

.letter-overlay.visible {
    opacity: 1;
    visibility: visible;
}

.letter-content {
    background: var(--glass-bg);
    border: 1px solid var(--border-color);
    border-radius: 15px;
    padding: 2.5rem 3rem;
    max-width: 600px;
    width: 90%;
    box-shadow: 0 10px 50px rgba(0, 0, 0, 0.5);
    position: relative;
    transform: scale(0.9);
    transition: transform 0.5s cubic-bezier(0.18, 0.89, 0.32, 1.28);
}

.letter-overlay.visible .letter-content {
    transform: scale(1);
}

.close-btn {
    position: absolute;
    top: 15px;
    right: 15px;
    background: none;
    border: none;
    color: var(--primary-text);
    font-size: 2rem;
    cursor: pointer;
    opacity: 0.7;
    transition: opacity 0.3s, transform 0.3s;
}

.close-btn:hover {
    opacity: 1;
    transform: rotate(90deg);
}

.letter-content h2 {
    color: var(--accent-gold);
    text-align: center;
    margin: 0 0 1.5rem 0;
}

.letter-content p {
    font-size: 1.1rem;
    line-height: 1.8;
    text-align: justify;
    margin-bottom: 1.5rem;
}

.signature {
    text-align: right;
    margin-top: 2rem;
}

.signature p {
    margin: 0;
    line-height: 1.5;
    font-size: 1.1rem;
}

/* --- 动画 --- */
@keyframes fade-in-up {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes breathe {

    0%,
    100% {
        transform: scale(0.9);
        box-shadow: 0 0 15px var(--accent-gold), 0 0 30px var(--glow-color);
    }

    50% {
        transform: scale(1.1);
        box-shadow: 0 0 25px var(--accent-gold), 0 0 50px var(--glow-color);
    }
}

@keyframes spin-clockwise {
    from {
        transform: rotate(0deg);
    }

    to {
        transform: rotate(360deg);
    }
}

@keyframes spin-counter-clockwise {
    from {
        transform: rotate(0deg);
    }

    to {
        transform: rotate(-360deg);
    }
}


/* --- 移动端适配 --- */
@media (max-width: 768px) {
    .container {
        padding: 1.5rem;
    }

    .header h1 {
        font-size: 2rem;
    }

    .header p {
        font-size: 1rem;
        margin-bottom: 2rem;
    }

    .tarot-deck {
        flex-direction: column;
        align-items: center;
        gap: 25px;
    }

    .card-container {
        width: 220px;
        height: 360px;
    }

    .letter-content {
        padding: 2.5rem 1.5rem;
    }

    .letter-content p {
        font-size: 1rem;
    }
}