/* 
 * 尹毓恪 - 致粉丝的信
 * 样式表文件
 * 法国新浪潮 × 韦斯·安德森复古风格
 */

/* ==================== 全局样式 ==================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    background: linear-gradient(135deg, #d5e5ea 0%, #b8cfd9 50%, #9fb4c7 100%);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
    overflow: hidden;
    position: relative;
}

/* 背景装饰波浪 */
.background-waves {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0.1;
    z-index: 0;
    pointer-events: none;
}

/* ==================== 主容器 ==================== */
.main-container {
    position: relative;
    z-index: 1;
    width: 100%;
    max-width: 900px;
    perspective: 1500px;
}

/* ==================== 信封样式（初始状态） ==================== */
.envelope-container {
    position: relative;
    width: 100%;
    max-width: 600px;
    margin: 0 auto;
    cursor: pointer;
    transition: transform 0.3s ease;
}

.envelope-container:hover {
    transform: scale(1.02);
}

.envelope-container.opened {
    pointer-events: none;
    animation: envelopeDisappear 1s ease-out forwards;
}

@keyframes envelopeDisappear {
    0% {
        opacity: 1;
        transform: scale(1);
    }
    50% {
        opacity: 0.5;
        transform: scale(0.9) translateY(-30px);
    }
    100% {
        opacity: 0;
        transform: scale(0.7) translateY(-80px);
        visibility: hidden;
    }
}

/* 信封主体 */
.envelope {
    position: relative;
    width: 100%;
    aspect-ratio: 1.6 / 1;
    background: linear-gradient(135deg, #f5f0e8 0%, #ebe4d8 100%);
    box-shadow: 
        0 20px 60px rgba(74, 107, 124, 0.3),
        inset 0 0 30px rgba(255, 255, 255, 0.5);
    border-radius: 8px;
}

/* 信封折叠上盖 */
.envelope-flap {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 60%;
    background: linear-gradient(135deg, #ebe4d8 0%, #ddd4c4 100%);
    clip-path: polygon(0 0, 50% 70%, 100% 0);
    box-shadow: 0 10px 30px rgba(74, 107, 124, 0.2);
    transform-origin: top center;
    transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 2;
}

.envelope-container:hover .envelope-flap {
    transform: rotateX(-5deg);
}

/* 信封装饰邮票 */
.envelope-stamp {
    position: absolute;
    top: 15px;
    right: 20px;
    width: 70px;
    height: 85px;
    background: linear-gradient(135deg, #9fb4c7 0%, #7a94a8 100%);
    border: 3px solid #f5f0e8;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
    z-index: 3;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 32px;
}

/* 邮票锯齿边缘效果 */
.envelope-stamp::before {
    content: '';
    position: absolute;
    inset: 6px;
    background: radial-gradient(circle, transparent 30%, rgba(245, 240, 232, 0.4) 31%, rgba(245, 240, 232, 0.4) 35%, transparent 36%);
    background-size: 7px 7px;
    background-position: -1px -1px;
}

/* 邮戳效果 */
.envelope-postmark {
    position: absolute;
    top: 45%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 120px;
    height: 120px;
    border: 3px solid rgba(122, 148, 168, 0.3);
    border-radius: 50%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 1;
}

.postmark-text {
    font-size: 14px;
    color: rgba(74, 107, 124, 0.5);
    letter-spacing: 2px;
    text-align: center;
    line-height: 1.6;
}

/* 提示文字 */
.envelope-hint {
    position: absolute;
    bottom: -50px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 14px;
    color: #4a6b7c;
    letter-spacing: 2px;
    animation: pulse 2s ease-in-out infinite;
    white-space: nowrap;
}

@keyframes pulse {
    0%, 100% {
        opacity: 0.6;
        transform: translateX(-50%) translateY(0);
    }
    50% {
        opacity: 1;
        transform: translateX(-50%) translateY(-5px);
    }
}

/* ==================== 信纸样式（展开后） ==================== */
.letter-container {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 100%;
    max-width: 900px;
    max-height: 90vh;
    transform: translate(-50%, -50%) scale(0.5);
    opacity: 0;
    visibility: hidden;
    background: #fdfaf5;
    box-shadow: 
        0 0 0 1px rgba(139, 169, 179, 0.1),
        0 30px 80px rgba(74, 107, 124, 0.4),
        inset 0 0 100px rgba(255, 250, 240, 0.5);
    border-radius: 6px;
    padding: 80px 100px 100px;
    overflow-y: auto;
    transition: all 1.2s cubic-bezier(0.4, 0, 0.2, 1);
}

.letter-container.visible {
    opacity: 1;
    visibility: visible;
    transform: translate(-50%, -50%) scale(1);
}

/* 自定义滚动条样式 */
.letter-container::-webkit-scrollbar {
    width: 12px;
}

.letter-container::-webkit-scrollbar-track {
    background: rgba(213, 229, 234, 0.3);
    border-radius: 0 6px 6px 0;
}

.letter-container::-webkit-scrollbar-thumb {
    background: linear-gradient(180deg, #9fb4c7 0%, #7a94a8 100%);
    border-radius: 6px;
    border: 2px solid #fdfaf5;
}

.letter-container::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(180deg, #7a94a8 0%, #4a6b7c 100%);
}

/* Firefox 滚动条样式 */
.letter-container {
    scrollbar-width: thin;
    scrollbar-color: #9fb4c7 rgba(213, 229, 234, 0.3);
}

/* 纸张纹理效果 */
.letter-container::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image: 
        repeating-linear-gradient(0deg, transparent, transparent 2px, rgba(139, 169, 179, 0.02) 2px, rgba(139, 169, 179, 0.02) 4px),
        repeating-linear-gradient(90deg, transparent, transparent 2px, rgba(139, 169, 179, 0.02) 2px, rgba(139, 169, 179, 0.02) 4px);
    border-radius: 6px;
    pointer-events: none;
}

/* 信纸装饰性邮票 */
.letter-stamp {
    position: absolute;
    width: 90px;
    height: 110px;
    background: linear-gradient(135deg, #9fb4c7 0%, #7a94a8 100%);
    border: 4px solid #fdfaf5;
    box-shadow: 0 6px 16px rgba(0, 0, 0, 0.2);
    z-index: 2;
}

.letter-stamp-left {
    top: -20px;
    left: -20px;
    transform: rotate(-12deg);
}

.letter-stamp-right {
    top: -20px;
    right: -20px;
    transform: rotate(12deg);
}

.letter-stamp::after {
    content: '';
    position: absolute;
    inset: 8px;
    background: radial-gradient(circle, transparent 30%, rgba(253, 250, 245, 0.3) 31%, rgba(253, 250, 245, 0.3) 35%, transparent 36%);
    background-size: 9px 9px;
    background-position: -2px -2px;
}

.letter-stamp-inner {
    position: absolute;
    inset: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 36px;
}

/* 角落装饰 */
.corner-decoration {
    position: absolute;
    width: 50px;
    height: 50px;
    border-color: #9fb4c7;
    opacity: 0.3;
}

.corner-top-left {
    top: 25px;
    left: 25px;
    border-top: 2px solid;
    border-left: 2px solid;
}

.corner-top-right {
    top: 25px;
    right: 25px;
    border-top: 2px solid;
    border-right: 2px solid;
}

.corner-bottom-left {
    bottom: 70px;
    left: 25px;
    border-bottom: 2px solid;
    border-left: 2px solid;
}

.corner-bottom-right {
    bottom: 70px;
    right: 25px;
    border-bottom: 2px solid;
    border-right: 2px solid;
}

/* ==================== 信件内容样式 ==================== */
.letter-header {
    text-align: center;
    margin-bottom: 60px;
    position: relative;
    z-index: 1;
}

.letter-title {
    font-size: 48px;
    color: #4a6b7c;
    font-weight: 300;
    letter-spacing: 12px;
    margin-bottom: 20px;
    font-family: 'STKaiti', 'KaiTi', 'STSong', serif;
}

.letter-subtitle {
    font-family: 'Courier New', monospace;
    font-size: 15px;
    color: #7a94a8;
    letter-spacing: 4px;
    text-transform: uppercase;
}

/* 分隔线 */
.divider {
    width: 80px;
    height: 2px;
    background: linear-gradient(90deg, transparent, #9fb4c7, transparent);
    margin: 25px auto;
}

/* 信件正文区域 */
.letter-content {
    position: relative;
    z-index: 1;
}

/* 段落样式 - 钢笔书写质感 */
.letter-paragraph {
    font-size: 19px;
    line-height: 2.4;
    color: #3d4e5a;
    margin-bottom: 40px;
    text-align: justify;
    position: relative;
    text-indent: 2em;
}

.letter-paragraph::first-line {
    font-weight: 500;
    color: #4a6b7c;
}

/* 引用/诗句样式 */
.letter-quote {
    font-size: 22px;
    line-height: 2;
    color: #5a7a8c;
    text-align: center;
    padding: 40px 80px;
    margin: 50px 0;
    position: relative;
    font-style: italic;
    font-family: 'STKaiti', 'KaiTi', serif;
}

.letter-quote::before,
.letter-quote::after {
    content: '"';
    font-size: 70px;
    color: #9fb4c7;
    opacity: 0.25;
    position: absolute;
    font-family: Georgia, serif;
}

.letter-quote::before {
    top: 10px;
    left: 30px;
}

.letter-quote::after {
    bottom: -10px;
    right: 30px;
}

/* 签名区域 */
.letter-signature {
    text-align: right;
    margin-top: 70px;
    color: #4a6b7c;
    font-size: 20px;
    font-family: 'STKaiti', 'KaiTi', serif;
}

.signature-name {
    margin-top: 25px;
    font-size: 28px;
    font-weight: 500;
    letter-spacing: 2px;
}

.signature-date {
    font-size: 15px;
    color: #7a94a8;
    margin-top: 12px;
    letter-spacing: 2px;
    font-family: 'Courier New', monospace;
}

/* ==================== 装饰性插图 ==================== */
/* 春天插图 - 左侧 */
.illustration-spring {
    position: absolute;
    left: -60px;
    top: 150px;
    width: 180px;
    height: 180px;
    opacity: 0.12;
    animation: float 7s ease-in-out infinite;
    pointer-events: none;
}

/* 海啸插图 - 右侧 */
.illustration-wave {
    position: absolute;
    right: -60px;
    bottom: 150px;
    width: 200px;
    height: 180px;
    opacity: 0.12;
    animation: float 9s ease-in-out infinite 1.5s;
    pointer-events: none;
}

@keyframes float {
    0%, 100% {
        transform: translateY(0) rotate(0deg);
    }
    50% {
        transform: translateY(-25px) rotate(2deg);
    }
}

/* ==================== 打开次数统计 ==================== */
.open-counter {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    font-family: 'Courier New', monospace;
    font-size: 13px;
    color: #9fb4c7;
    letter-spacing: 2px;
    display: flex;
    align-items: center;
    gap: 12px;
}

.counter-number {
    font-weight: 600;
    color: #4a6b7c;
    font-size: 16px;
    min-width: 70px;
    text-align: center;
    padding: 6px 16px;
    background: rgba(159, 180, 199, 0.15);
    border-radius: 4px;
}

/* 页脚彩蛋 */
.footer-message {
    position: absolute;
    bottom: -50px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 12px;
    color: rgba(74, 107, 124, 0.6);
    letter-spacing: 1px;
    font-style: italic;
    white-space: nowrap;
}

/* 淡入动画（用于段落滚动效果） */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ==================== 响应式设计 ==================== */
@media (max-width: 768px) {
    .letter-container {
        padding: 50px 35px 80px;
        max-height: 85vh;
    }
    
    /* 移动端滚动条样式 */
    .letter-container::-webkit-scrollbar {
        width: 8px;
    }

    .letter-title {
        font-size: 36px;
        letter-spacing: 6px;
    }

    .letter-subtitle {
        font-size: 13px;
        letter-spacing: 3px;
    }

    .letter-paragraph {
        font-size: 17px;
        line-height: 2.2;
    }

    .letter-quote {
        font-size: 18px;
        padding: 30px 40px;
    }

    .letter-stamp {
        width: 70px;
        height: 85px;
    }

    .letter-stamp-inner {
        font-size: 28px;
    }

    .illustration-spring,
    .illustration-wave {
        display: none;
    }

    .envelope-hint {
        font-size: 12px;
        bottom: -40px;
    }

    .footer-message {
        font-size: 10px;
    }
}

@media (max-width: 480px) {
    .letter-container {
        padding: 40px 25px 70px;
        max-height: 80vh;
    }

    .letter-title {
        font-size: 28px;
        letter-spacing: 4px;
    }

    .letter-paragraph {
        font-size: 16px;
    }

    .letter-quote {
        font-size: 16px;
        padding: 25px 30px;
    }
}