/* ============ 全局变量：赛博朋克模式 (默认) ============ */
:root {
    --bg-deep: #06060f;
    --bg-card: rgba(10, 10, 26, 0.92);
    --bg-card-hover: rgba(15, 15, 35, 0.96);
    --text-primary: #e0e0f0;
    --text-secondary: #b0b0cc;
    --text-muted: #7a7a9a;
    --border-card: rgba(255, 255, 255, 0.08);
    --border-glow: rgba(0, 229, 255, 0.2);
    --neon-cyan: #00e5ff;
    --neon-magenta: #d500f9;
    --neon-purple: #7c4dff;
    --accent-pink: #ff4081;
    --nav-bg: rgba(8, 8, 22, 0.9);
    --nav-border: rgba(0, 229, 255, 0.25);
    --bottom-nav-bg: rgba(8, 8, 22, 0.92);
    --card-shadow: 0 4px 30px rgba(0, 0, 0, 0.5);
    --avatar-border: rgba(0, 229, 255, 0.5);
    --like-color: #ff4081;
    --btn-hover-bg: rgba(0, 229, 255, 0.08);
    --verified-color: #00e5ff;
    --grid-color: rgba(0, 229, 255, 0.04);
    --scanline-color: rgba(255, 255, 255, 0.015);
}

/* ============ 墨水屏模式变量 ============ */
body.ink-mode {
    --bg-deep: #f5f5f0;
    --bg-card: rgba(255, 255, 255, 0.95);
    --bg-card-hover: rgba(255, 255, 255, 1);
    --text-primary: #1a1a1a;
    --text-secondary: #333333;
    --text-muted: #5c5c5c;
    --border-card: #cccccc;
    --border-glow: #aaaaaa;
    --neon-cyan: #1a5c6e;
    --neon-magenta: #6b1a6b;
    --neon-purple: #4a3a6e;
    --accent-pink: #6e2a3a;
    --nav-bg: rgba(245, 245, 240, 0.95);
    --nav-border: #bbbbbb;
    --bottom-nav-bg: rgba(245, 245, 240, 0.95);
    --card-shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
    --avatar-border: #777777;
    --like-color: #b33a4a;
    --btn-hover-bg: rgba(0, 0, 0, 0.05);
    --verified-color: #1a5c6e;
    --grid-color: rgba(0, 0, 0, 0.03);
    --scanline-color: transparent;
}

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

body {
    font-family: 'PingFang SC', 'Microsoft YaHei', sans-serif;
    background: var(--bg-deep);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    transition: background 0.5s, color 0.5s;
    position: relative;
}

/* 粒子背景 */
#particleCanvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 0;
    transition: opacity 0.5s;
}
body.ink-mode #particleCanvas {
    opacity: 0;
}

/* 扫描线 */
.scanlines-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 1;
    background: repeating-linear-gradient(
        0deg,
        transparent,
        transparent 2px,
        var(--scanline-color) 2px,
        var(--scanline-color) 4px
    );
    transition: background 0.5s;
}

/* 网格背景 */
.grid-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 0;
    background-image:
        linear-gradient(var(--grid-color) 1px, transparent 1px),
        linear-gradient(90deg, var(--grid-color) 1px, transparent 1px);
    background-size: 40px 40px;
    mask-image: radial-gradient(ellipse at 50% 0%, black 20%, transparent 70%);
    -webkit-mask-image: radial-gradient(ellipse at 50% 0%, black 20%, transparent 70%);
}

/* 主容器 */
.main-container {
    position: relative;
    z-index: 10;
    width: 100%;
    max-width: 600px;
    min-height: 100vh;
    padding: 0 0 100px;
    display: flex;
    flex-direction: column;
}

/* 顶部导航 */
.top-nav {
    position: sticky;
    top: 0;
    z-index: 100;
    background: var(--nav-bg);
    backdrop-filter: blur(18px);
    -webkit-backdrop-filter: blur(18px);
    border-bottom: 1px solid var(--nav-border);
    padding: 14px 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    transition: all 0.5s;
}
.top-nav::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 0;
    width: 100%;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--neon-cyan), transparent, var(--neon-magenta), transparent);
    opacity: 0.5;
    transition: background 0.5s;
}
.nav-title-group {
    display: flex;
    align-items: center;
    gap: 10px;
}
.nav-icon {
    width: 34px;
    height: 34px;
    border-radius: 50%;
    background: conic-gradient(from 0deg, var(--neon-cyan), var(--neon-magenta), var(--neon-purple), var(--neon-cyan));
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 0 18px rgba(0,229,255,0.4);
    transition: all 0.5s;
}
.nav-icon-inner {
    width: 22px;
    height: 22px;
    border-radius: 50%;
    background: var(--bg-deep);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
}
.nav-title {
    font-size: 1.1rem;
    font-weight: 700;
    letter-spacing: 2px;
    background: linear-gradient(135deg, var(--neon-cyan), #a0e9ff, var(--neon-purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.nav-subtitle {
    font-size: 0.6rem;
    letter-spacing: 3px;
    color: var(--text-muted);
    display: block;
    -webkit-text-fill-color: var(--text-muted);
}
.nav-actions {
    display: flex;
    gap: 12px;
}
.nav-btn {
    width: 34px;
    height: 34px;
    border-radius: 50%;
    background: rgba(128,128,128,0.06);
    border: 1px solid rgba(128,128,128,0.15);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    font-size: 18px;
    transition: all 0.3s;
}
.nav-btn:hover {
    border-color: var(--neon-cyan);
    box-shadow: 0 0 16px rgba(0,229,255,0.25);
    color: var(--neon-cyan);
}

/* 动态卡片列表 */
.feed-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
    padding: 20px 18px;
}
.feed-card {
    background: var(--bg-card);
    border-radius: 18px;
    padding: 18px 20px;
    border: 1px solid var(--border-card);
    box-shadow: var(--card-shadow);
    transition: all 0.4s;
    animation: cardAppear 0.45s ease-out backwards;
}
.feed-card:hover {
    border-color: var(--border-glow);
    background: var(--bg-card-hover);
}
@keyframes cardAppear {
    from {
        opacity: 0;
        transform: translateY(28px) scale(0.96);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}
.card-header {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    margin-bottom: 14px;
}
.card-avatar {
    width: 42px;
    height: 42px;
    border-radius: 50%;
    flex-shrink: 0;
    border: 2px solid var(--avatar-border);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    background: var(--bg-card);
    box-shadow: 0 0 15px rgba(0,229,255,0.15);
}
.card-user-info {
    flex: 1;
}
.card-username {
    font-weight: 650;
    font-size: 0.95rem;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 5px;
}
.verified-badge {
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: var(--verified-color);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 8px;
    color: #000;
    box-shadow: 0 0 6px var(--verified-color);
}
.card-time {
    font-size: 0.7rem;
    color: var(--text-muted);
    margin-top: 3px;
}
.card-body {
    line-height: 1.75;
    font-size: 0.92rem;
    color: var(--text-secondary);
    white-space: pre-wrap;
    margin-bottom: 8px;
}
.card-body .highlight {
    color: var(--neon-cyan);
    font-weight: 500;
}
.card-actions {
    display: flex;
    gap: 6px;
    align-items: center;
    padding-top: 8px;
    border-top: 1px solid rgba(128,128,128,0.08);
}
.action-btn {
    display: flex;
    align-items: center;
    gap: 5px;
    padding: 6px 14px;
    border-radius: 18px;
    background: transparent;
    border: none;
    cursor: pointer;
    color: var(--text-muted);
    font-size: 0.8rem;
    transition: all 0.3s;
    font-family: inherit;
}
.action-btn:hover {
    color: var(--text-primary);
    background: rgba(128,128,128,0.05);
}
.action-btn.liked {
    color: var(--like-color);
}
.action-icon {
    font-size: 1.1rem;
    transition: transform 0.2s;
}
.action-btn:active .action-icon {
    transform: scale(1.3);
}

/* 评论区 */
.comments-section {
    margin-top: 10px;
    padding-top: 8px;
    border-top: 1px solid rgba(128,128,128,0.07);
    display: none;
}
.comments-section.open {
    display: block;
    animation: commentSlide 0.3s ease-out;
}
@keyframes commentSlide {
    from {
        opacity: 0;
        transform: translateY(-6px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}
.comment-item {
    padding: 5px 10px;
    margin: 3px 0;
    border-radius: 8px;
    background: rgba(128,128,128,0.03);
    font-size: 0.8rem;
    color: var(--text-secondary);
    display: flex;
    gap: 6px;
}
.comment-user {
    font-weight: 600;
    color: var(--text-primary);
}

/* 分页 */
.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 16px;
    padding: 20px 0 10px;
}
.pagination button {
    background: var(--bg-card);
    border: 1px solid var(--border-card);
    color: var(--text-primary);
    padding: 8px 18px;
    border-radius: 20px;
    cursor: pointer;
    font-size: 0.85rem;
    transition: all 0.3s;
}
.pagination button:hover:not(:disabled) {
    border-color: var(--neon-cyan);
    color: var(--neon-cyan);
}
.pagination button:disabled {
    opacity: 0.4;
    cursor: default;
}
.pagination .page-info {
    color: var(--text-muted);
    font-size: 0.8rem;
}

/* 底部导航 */
.bottom-nav {
    position: fixed;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 100%;
    max-width: 600px;
    z-index: 100;
    background: var(--bottom-nav-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-top: 1px solid var(--nav-border);
    display: flex;
    justify-content: space-around;
    padding: 8px 12px 16px;
    transition: all 0.5s;
}
.nav-tab {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 3px;
    cursor: pointer;
    color: var(--text-muted);
    padding: 6px 14px;
    border-radius: 12px;
    font-size: 0.7rem;
    letter-spacing: 1px;
    background: transparent;
    border: none;
    font-family: inherit;
    position: relative;
}
.nav-tab.active {
    color: var(--neon-cyan);
    font-weight: 600;
}
.nav-tab.active::after {
    content: '';
    position: absolute;
    bottom: -12px;
    width: 24px;
    height: 2px;
    background: var(--neon-cyan);
    border-radius: 2px;
    box-shadow: 0 0 10px var(--neon-cyan);
}
.tab-icon {
    font-size: 1.3rem;
}

/* Toast */
.toast {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) scale(0.8);
    background: rgba(0,0,0,0.9);
    border: 1px solid var(--neon-cyan);
    color: #fff;
    padding: 10px 24px;
    border-radius: 24px;
    font-size: 0.85rem;
    z-index: 300;
    pointer-events: none;
    opacity: 0;
    transition: all 0.3s;
}
.toast.show {
    opacity: 1;
    transform: translate(-50%, -50%) scale(1);
}

/* 滚动条 */
::-webkit-scrollbar {
    width: 4px;
}
::-webkit-scrollbar-thumb {
    background: rgba(0,229,255,0.25);
    border-radius: 10px;
}

/* 爱心飘动动画 */
@keyframes heartFly {
    0% {
        opacity: 1;
        transform: translateY(0) scale(1) rotate(0deg);
    }
    30% {
        opacity: 1;
        transform: translateY(-20px) scale(1.3) rotate(10deg);
    }
    100% {
        opacity: 0;
        transform: translateY(-70px) scale(0.5) rotate(-20deg);
    }
}