/* ============================================
   时光胶囊 - 主样式表
   ============================================ */

/* 全局变量 */
:root {
    --color-primary: #5D4037;
    --color-primary-light: #8D6E63;
    --color-primary-lighter: #A1887F;
    --color-primary-lightest: #D7CCC8;
    --color-gold: #C9A84C;
    --color-bg: #faf8f5;
    --color-bg-card: #ffffff;
    --color-text: #3D3226;
    --color-text-muted: #8D8D8D;
}

/* 基础样式 */
body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
    color: var(--color-text);
    background-color: var(--color-bg);
}

a {
    color: var(--color-primary);
}

a:hover {
    color: var(--color-primary-light);
}

/* 导航栏 */
.navbar {
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.navbar-brand {
    font-size: 1.3rem;
    letter-spacing: 0.5px;
}

/* 卡片样式 */
.card {
    border-radius: 0.75rem;
    transition: box-shadow 0.2s ease, transform 0.2s ease;
}

.hover-shadow:hover {
    box-shadow: 0 0.5rem 1.5rem rgba(0,0,0,0.12) !important;
    transform: translateY(-2px);
}

/* 按钮样式 */
.btn-primary-custom {
    background-color: var(--color-primary);
    border-color: var(--color-primary);
    color: #fff;
}

.btn-primary-custom:hover {
    background-color: var(--color-primary-light);
    border-color: var(--color-primary-light);
    color: #fff;
}

/* 页面标题 */
.page-title {
    color: var(--color-primary);
    font-weight: 700;
}

/* 倒计时样式 */
.countdown-display {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-primary-light);
    font-variant-numeric: tabular-nums;
}

/* 信件内容区域 */
.letter-content {
    line-height: 1.8;
    font-size: 1rem;
    word-wrap: break-word;
}

.letter-content img {
    max-width: 100%;
    height: auto;
    border-radius: 0.5rem;
}

.letter-content p {
    margin-bottom: 1rem;
}

/* 瀑布流网格 */
.masonry-grid {
    column-gap: 1.5rem;
}

@media (min-width: 768px) {
    .masonry-grid {
        column-count: 2;
    }
}

@media (min-width: 992px) {
    .masonry-grid {
        column-count: 3;
    }
}

/* 通知下拉 */
.notification-items .notification-item {
    padding: 0.75rem 1rem;
    border-bottom: 1px solid #f0f0f0;
    cursor: pointer;
    transition: background-color 0.15s;
}

.notification-items .notification-item:hover {
    background-color: #f8f8f8;
}

.notification-items .notification-item.unread {
    background-color: #fef9f0;
}

/* 信封皮肤预览 */
.skin-vintage-preview {
    background: linear-gradient(135deg, #f5f0e8, #e8dcc8);
    border: 2px solid #c9a84c;
}

.skin-classic-preview {
    background: #ffffff;
    border: 2px solid #e0e0e0;
}

.skin-starry-preview {
    background: linear-gradient(135deg, #1a237e, #283593, #3949ab);
    border: 2px solid #5c6bc0;
    position: relative;
}

.skin-starry-preview::after {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    background: radial-gradient(1px 1px at 20% 30%, #fff 100%, transparent),
                radial-gradient(1px 1px at 40% 70%, #fff 100%, transparent),
                radial-gradient(1.5px 1.5px at 70% 20%, #fff 100%, transparent),
                radial-gradient(1px 1px at 60% 50%, #fff 100%, transparent),
                radial-gradient(1.5px 1.5px at 30% 80%, #fff 100%, transparent);
    opacity: 0.6;
}

.skin-sakura-preview {
    background: linear-gradient(135deg, #fce4ec, #f8bbd0);
    border: 2px solid #f48fb1;
}

.skin-forest-preview {
    background: linear-gradient(135deg, #e8f5e9, #a5d6a7);
    border: 2px solid #66bb6a;
}

.skin-dark-preview {
    background: #1a1a1a;
    border: 2px solid #444;
}

/* 皮肤应用到卡片 */
.skin-vintage-card { background-color: #f5f0e8; border-color: #c9a84c; }
.skin-classic-card { background-color: #ffffff; }
.skin-starry-card { background-color: #1a237e; color: #fff; }
.skin-sakura-card { background-color: #fce4ec; }
.skin-forest-card { background-color: #e8f5e9; }
.skin-dark-card { background-color: #2d2d2d; color: #ccc; }

/* 分享按钮 */
.share-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    border: 1px solid #dee2e6;
    background: #fff;
    cursor: pointer;
    transition: all 0.2s;
}

.share-btn:hover {
    background: #f8f9fa;
    border-color: #adb5bd;
}

/* Toast提示 */
.toast-container {
    z-index: 1060;
}

/* 加载动画 */
.spinner-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255,255,255,0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
}

/* 响应式调整 */
@media (max-width: 767.98px) {
    .navbar-brand {
        font-size: 1.1rem;
    }

    .display-3 {
        font-size: 2rem;
    }

    .lead {
        font-size: 1rem;
    }
}

/* 表单样式 */
.form-control:focus {
    border-color: var(--color-primary-light);
    box-shadow: 0 0 0 0.2rem rgba(93, 64, 55, 0.15);
}

.form-select:focus {
    border-color: var(--color-primary-light);
    box-shadow: 0 0 0 0.2rem rgba(93, 64, 55, 0.15);
}

/* 分页样式 */
.page-link {
    color: var(--color-primary);
}

.page-item.active .page-link {
    background-color: var(--color-primary);
    border-color: var(--color-primary);
}

/* 页脚 */
footer a:hover {
    color: #fff !important;
}

/* 火漆印章动画 */
@keyframes sealBreak {
    0% { transform: scale(1); opacity: 1; }
    50% { transform: scale(1.2); opacity: 0.5; }
    100% { transform: scale(0); opacity: 0; }
}

.seal-breaking {
    animation: sealBreak 1s ease-in-out forwards;
}

/* 信件打开动画 */
@keyframes letterOpen {
    0% { transform: perspective(500px) rotateY(0deg); }
    100% { transform: perspective(500px) rotateY(-180deg); }
}

.letter-opening {
    animation: letterOpen 1s ease-in-out;
    transform-style: preserve-3d;
}

/* 徽章悬停 */
.badge-icon {
    transition: transform 0.2s;
}

.badge-icon:hover {
    transform: scale(1.15);
}