/* ========== NeoCheDao 样式 ========== */
:root {
    --bg: #ffffff;
    --bg-soft: #f8fafc;
    --bg-card: rgba(255, 255, 255, 0.7);
    --text: #0f172a;
    --text-soft: #64748b;
    --text-mute: #94a3b8;
    --border: rgba(15, 23, 42, 0.08);
    --border-strong: rgba(15, 23, 42, 0.14);
    --primary: #2563eb;
    --primary-2: #4f46e5;
    --primary-glow: rgba(37, 99, 235, 0.35);
    --accent: #06b6d4;
    --danger: #ef4444;
    --success: #10b981;
    --radius: 16px;
    --radius-sm: 10px;
    --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.04), 0 2px 8px rgba(15, 23, 42, 0.04);
    --shadow: 0 4px 16px rgba(15, 23, 42, 0.06), 0 12px 32px rgba(15, 23, 42, 0.06);
    --shadow-lg: 0 20px 50px rgba(15, 23, 42, 0.12);
    --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

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

html { scroll-behavior: smooth; }

body {
    font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    overflow-x: hidden;
    min-height: 100vh;
}

a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }
input { font-family: inherit; }

/* ========== 背景装饰 ========== */
.bg-decoration {
    position: fixed; inset: 0; z-index: -1; pointer-events: none;
    overflow: hidden;
}
.blob {
    position: absolute; border-radius: 50%; filter: blur(80px); opacity: 0.5;
    animation: float 20s ease-in-out infinite;
}
.blob-1 {
    width: 500px; height: 500px; background: radial-gradient(circle, #dbeafe, #bfdbfe);
    top: -150px; left: -100px;
}
.blob-2 {
    width: 600px; height: 600px; background: radial-gradient(circle, #ede9fe, #ddd6fe);
    bottom: -200px; right: -150px; animation-delay: -10s;
}
.grid-overlay {
    position: absolute; inset: 0;
    background-image:
        linear-gradient(rgba(15,23,42,0.025) 1px, transparent 1px),
        linear-gradient(90deg, rgba(15,23,42,0.025) 1px, transparent 1px);
    background-size: 48px 48px;
    mask-image: radial-gradient(ellipse at center, black 30%, transparent 75%);
    -webkit-mask-image: radial-gradient(ellipse at center, black 30%, transparent 75%);
}
@keyframes float {
    0%, 100% { transform: translate(0,0) scale(1); }
    33% { transform: translate(40px, -30px) scale(1.05); }
    66% { transform: translate(-30px, 30px) scale(0.95); }
}

/* ========== 导航栏 ========== */
.navbar {
    position: fixed; top: 0; left: 0; right: 0; z-index: 100;
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    background: rgba(255, 255, 255, 0.72);
    border-bottom: 1px solid var(--border);
    transition: all 0.4s var(--ease);
}
.nav-container {
    max-width: 1200px; margin: 0 auto; padding: 0 24px;
    display: flex; align-items: center; justify-content: space-between;
    height: 64px;
}
.nav-logo {
    display: flex; align-items: center; gap: 10px;
    font-family: 'Orbitron', sans-serif; font-weight: 700; font-size: 1.15rem;
}
.logo-mark {
    width: 36px; height: 36px; display: grid; place-items: center;
    background: linear-gradient(135deg, var(--primary), var(--primary-2));
    color: white; border-radius: 10px; font-weight: 900;
    box-shadow: 0 4px 12px var(--primary-glow);
    transition: transform 0.3s var(--ease);
}
.nav-logo:hover .logo-mark { transform: rotate(-8deg) scale(1.05); }
.logo-text { background: linear-gradient(135deg, var(--text), var(--primary)); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; }

.nav-menu {
    display: flex; gap: 4px; list-style: none; align-items: center;
}
.nav-link {
    padding: 8px 16px; border-radius: 8px; font-size: 0.92rem; font-weight: 500;
    color: var(--text-soft); position: relative; transition: all 0.3s var(--ease);
}
.nav-link:hover { color: var(--text); background: var(--bg-soft); }
.nav-link.active {
    color: var(--primary); background: rgba(37, 99, 235, 0.08);
}
.nav-toggle { display: none; flex-direction: column; gap: 5px; padding: 8px; }
.nav-toggle span { width: 22px; height: 2px; background: var(--text); border-radius: 2px; transition: 0.3s; }

/* ========== 页面容器 ========== */
main { min-height: 100vh; padding-top: 64px; }

.page {
    display: none;
    max-width: 1200px; margin: 0 auto; padding: 48px 24px 80px;
    animation: pageEnter 0.6s var(--ease);
}
.page.active { display: block; }

@keyframes pageEnter {
    from { opacity: 0; transform: translateY(24px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ========== 按钮 ========== */
.btn {
    display: inline-flex; align-items: center; gap: 8px;
    padding: 12px 24px; border-radius: 12px; font-weight: 600; font-size: 0.95rem;
    transition: all 0.3s var(--ease); cursor: pointer; white-space: nowrap;
}
.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--primary-2));
    color: white; box-shadow: 0 8px 20px var(--primary-glow);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 12px 28px var(--primary-glow); }
.btn-primary:active { transform: translateY(0); }
.btn-ghost {
    background: white; color: var(--text); border: 1px solid var(--border-strong);
}
.btn-ghost:hover { border-color: var(--primary); color: var(--primary); transform: translateY(-2px); }
.btn-qq {
    background: linear-gradient(135deg, #12b7f5, #0e9fd6);
    color: white; box-shadow: 0 8px 20px rgba(18,183,245,0.35);
}
.btn-qq:hover { transform: translateY(-2px); box-shadow: 0 12px 28px rgba(18,183,245,0.45); }
.btn-qq:active { transform: translateY(0); }
.btn-steam {
    background: linear-gradient(135deg, #1b2838, #2a475e);
    color: #fff; box-shadow: 0 8px 20px rgba(27,40,56,0.4);
}
.btn-steam:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 28px rgba(102,192,244,0.45);
    filter: brightness(1.12);
}
.btn-steam:active { transform: translateY(0); }
.btn-steam svg { fill: #c3e7ff; }
.btn.full { width: 100%; justify-content: center; }
.btn-danger { background: var(--danger); color: white; }
.btn-danger:hover { box-shadow: 0 8px 20px rgba(239,68,68,0.3); }

/* ========== 首页 Hero ========== */
.hero {
    text-align: center; padding: 40px 0 60px;
    display: flex; flex-direction: column; align-items: center;
    transform-origin: center top;
    will-change: opacity, transform;
}
.hero-logo-wrap {
    position: relative; width: 260px; height: 260px; margin-bottom: 40px;
    animation: heroIn 1s var(--ease);
}
@keyframes heroIn {
    from { opacity: 0; transform: scale(0.6) rotate(-10deg); }
    to { opacity: 1; transform: scale(1) rotate(0); }
}
.hero-logo {
    position: absolute; inset: 30px; border-radius: 50%;
    background: linear-gradient(135deg, #1e293b, #0f172a);
    display: grid; place-items: center; overflow: hidden;
    box-shadow: 0 20px 60px rgba(15,23,42,0.35), inset 0 0 40px rgba(37,99,235,0.3);
    animation: logoPulse 4s ease-in-out infinite;
}
@keyframes logoPulse {
    0%, 100% { box-shadow: 0 20px 60px rgba(15,23,42,0.35), inset 0 0 40px rgba(37,99,235,0.3); }
    50% { box-shadow: 0 20px 80px rgba(37,99,235,0.45), inset 0 0 60px rgba(37,99,235,0.5); }
}
.logo-inner {
    display: flex; align-items: baseline;
    font-family: 'Orbitron', sans-serif; font-weight: 900;
    color: white; font-size: 5rem; line-height: 1;
    text-shadow: 0 0 30px rgba(96,165,250,0.8);
    position: relative; z-index: 2;
}
.big-n {
    background: linear-gradient(180deg, #fff, #cbd5e1);
    -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
    transform: skewX(-6deg);
}
.big-d {
    margin-left: -10px;
    background: linear-gradient(180deg, #fff, #94a3b8);
    -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
}
.logo-glow {
    position: absolute; inset: 0;
    background: radial-gradient(circle at 30% 70%, rgba(59,130,246,0.5), transparent 60%),
                radial-gradient(circle at 70% 30%, rgba(139,92,246,0.4), transparent 50%);
    animation: glowMove 6s ease-in-out infinite;
}
@keyframes glowMove {
    0%, 100% { transform: translate(0,0); }
    50% { transform: translate(8px, -8px); }
}
.hero-logo-ring {
    position: absolute; inset: 0; border-radius: 50%;
    border: 2px dashed rgba(37,99,235,0.3);
    animation: spin 30s linear infinite;
}
.hero-circle-text {
    position: absolute; inset: -10px; pointer-events: none;
    animation: spin 20s linear infinite reverse;
}
.circle-svg { width: 100%; height: 100%; }
.circle-text {
    fill: var(--primary); font-family: 'Orbitron', sans-serif;
    font-size: 10px; letter-spacing: 3px; font-weight: 700;
    text-transform: uppercase;
}
@keyframes spin { to { transform: rotate(360deg); } }

.hero-title {
    font-family: 'Orbitron', sans-serif;
    font-size: clamp(2.5rem, 6vw, 4.5rem); font-weight: 900;
    background: linear-gradient(135deg, var(--text) 0%, var(--primary) 50%, var(--primary-2) 100%);
    -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
    letter-spacing: -1px; margin-bottom: 12px;
}
.hero-subtitle {
    font-size: 1.15rem; color: var(--text-soft); margin-bottom: 36px;
    letter-spacing: 4px; font-weight: 300;
}
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; justify-content: center; }

/* ========== 区块标题 ========== */
.section-title {
    text-align: center; font-size: clamp(1.6rem, 3.5vw, 2.2rem);
    font-weight: 700; margin: 60px 0 36px; letter-spacing: -0.5px;
}
.section-title.small { font-size: 1.5rem; margin-top: 48px; margin-bottom: 24px; }
.title-accent {
    background: linear-gradient(135deg, var(--primary), var(--primary-2));
    -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
}

/* ========== 优点卡片 ========== */
.feature-grid {
    display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 20px;
}
.feature-card {
    background: var(--bg-card); backdrop-filter: blur(12px);
    border: 1px solid var(--border); border-radius: var(--radius);
    padding: 28px 24px; transition: all 0.4s var(--ease);
    position: relative; overflow: hidden;
}
.feature-card::before {
    content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px;
    background: linear-gradient(90deg, var(--primary), var(--primary-2), var(--accent));
    transform: scaleX(0); transform-origin: left; transition: transform 0.4s var(--ease);
}
.feature-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-glow);
}
.feature-card:hover::before { transform: scaleX(1); }
.feature-icon {
    width: 52px; height: 52px; border-radius: 14px;
    background: linear-gradient(135deg, rgba(37,99,235,0.12), rgba(79,70,229,0.12));
    color: var(--primary); display: grid; place-items: center;
    margin-bottom: 18px; transition: transform 0.4s var(--ease);
}
.feature-card:hover .feature-icon { transform: scale(1.1) rotate(-5deg); }
.feature-card h3 { font-size: 1.15rem; margin-bottom: 8px; }
.feature-card p { color: var(--text-soft); font-size: 0.9rem; }

/* ========== 快捷入口 ========== */
.entry-grid {
    display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 20px;
}
.entry-card {
    background: var(--bg-card); backdrop-filter: blur(12px);
    border: 1px solid var(--border); border-radius: var(--radius);
    padding: 32px 24px; text-align: center; transition: all 0.4s var(--ease);
    display: block; position: relative; overflow: hidden;
}
.entry-card::after {
    content: ''; position: absolute; inset: 0;
    background: linear-gradient(135deg, var(--primary), var(--primary-2));
    opacity: 0; transition: opacity 0.4s var(--ease); z-index: 0;
}
.entry-card > * { position: relative; z-index: 1; transition: color 0.4s var(--ease); }
.entry-card:hover { transform: translateY(-8px); box-shadow: var(--shadow-lg); }
.entry-card:hover::after { opacity: 1; }
.entry-card:hover h3, .entry-card:hover p { color: white; }
.entry-ico {
    width: 64px; height: 64px; margin: 0 auto 18px;
    border-radius: 18px; display: grid; place-items: center;
    background: linear-gradient(135deg, rgba(37,99,235,0.15), rgba(79,70,229,0.15));
    color: var(--primary); transition: all 0.4s var(--ease);
}
.entry-card:hover .entry-ico { background: rgba(255,255,255,0.2); color: white; transform: scale(1.1); }
.entry-card h3 { font-size: 1.2rem; margin-bottom: 6px; }
.entry-card p { color: var(--text-soft); font-size: 0.9rem; }

/* ========== 页脚 ========== */
.site-footer {
    text-align: center; padding: 48px 0 0; color: var(--text-mute);
    font-size: 0.85rem;
}

/* ========== 图片展示专栏 ========== */
.showcase { margin-top: 20px; }
.showcase-sub {
    text-align: center; color: var(--text-soft); margin: -24px 0 36px;
    font-size: 0.95rem; letter-spacing: 1px;
}
.showcase-group { margin-bottom: 48px; }
.showcase-group-title {
    display: flex; align-items: center; gap: 10px;
    font-size: 1.2rem; font-weight: 700; margin-bottom: 20px;
    color: var(--text);
}
.showcase-group-title .dot {
    width: 10px; height: 10px; border-radius: 50%;
    box-shadow: 0 0 10px currentColor;
}
.showcase-grid {
    display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 16px;
}
.showcase-item {
    border-radius: var(--radius); overflow: hidden;
    background: var(--bg-soft); border: 1px solid var(--border);
    aspect-ratio: 16/9; cursor: pointer;
    transition: transform 0.4s var(--ease), box-shadow 0.4s var(--ease);
}
.showcase-item img {
    width: 100%; height: 100%; object-fit: cover;
    transition: transform 0.6s var(--ease);
}
.showcase-item:hover {
    transform: translateY(-4px); box-shadow: var(--shadow-lg);
}
.showcase-item:hover img { transform: scale(1.06); }

/* ========== 页面通用头部 ========== */
.page-header { margin-bottom: 36px; }
.page-title {
    font-family: 'Orbitron', sans-serif; font-size: clamp(2rem, 4vw, 2.8rem);
    font-weight: 800; margin-bottom: 8px;
    background: linear-gradient(135deg, var(--text), var(--primary));
    -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
}
.page-desc { color: var(--text-soft); font-size: 1rem; }

/* ========== 文件页 ========== */
.files-container { display: flex; flex-direction: column; gap: 12px; }
.file-item {
    display: flex; align-items: center; gap: 16px;
    background: var(--bg-card); backdrop-filter: blur(12px);
    border: 1px solid var(--border); border-radius: var(--radius);
    padding: 18px 20px; transition: all 0.3s var(--ease);
    animation: slideIn 0.5s var(--ease) both;
}
.file-item:hover {
    border-color: var(--primary); box-shadow: var(--shadow);
    transform: translateX(4px);
}
.file-icon {
    width: 48px; height: 48px; border-radius: 12px; flex-shrink: 0;
    background: linear-gradient(135deg, rgba(37,99,235,0.12), rgba(79,70,229,0.12));
    color: var(--primary); display: grid; place-items: center;
}
.file-info { flex: 1; min-width: 0; }
.file-name { font-weight: 600; margin-bottom: 2px; word-break: break-all; }
.file-meta { font-size: 0.8rem; color: var(--text-mute); }
.file-actions { display: flex; gap: 8px; flex-shrink: 0; }
.btn-icon {
    width: 38px; height: 38px; border-radius: 10px; display: grid; place-items: center;
    background: var(--bg-soft); color: var(--text-soft); transition: all 0.3s var(--ease);
}
.btn-icon:hover { background: var(--primary); color: white; transform: scale(1.08); }
.btn-icon.danger:hover { background: var(--danger); }

@keyframes slideIn {
    from { opacity: 0; transform: translateX(-20px); }
    to { opacity: 1; transform: translateX(0); }
}

/* ========== 图片画廊 ========== */
.gallery {
    display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 16px;
}
.gallery-item {
    position: relative; border-radius: var(--radius); overflow: hidden;
    aspect-ratio: 4/3; cursor: pointer;
    background: var(--bg-soft); border: 1px solid var(--border);
    animation: zoomIn 0.5s var(--ease) both;
    transition: transform 0.4s var(--ease), box-shadow 0.4s var(--ease);
}
.gallery-item:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.gallery-item img {
    width: 100%; height: 100%; object-fit: cover;
    transition: transform 0.6s var(--ease);
}
.gallery-item:hover img { transform: scale(1.08); }
.gallery-overlay {
    position: absolute; inset: 0;
    background: linear-gradient(to top, rgba(15,23,42,0.7), transparent 60%);
    display: flex; align-items: flex-end; padding: 14px;
    opacity: 0; transition: opacity 0.3s var(--ease);
}
.gallery-item:hover .gallery-overlay { opacity: 1; }
.gallery-overlay span { color: white; font-size: 0.85rem; font-weight: 500; }

@keyframes zoomIn {
    from { opacity: 0; transform: scale(0.85); }
    to { opacity: 1; transform: scale(1); }
}

/* ========== 空状态 ========== */
.empty-state {
    grid-column: 1 / -1;
    text-align: center; padding: 60px 20px; color: var(--text-mute);
    background: var(--bg-card); border: 1px dashed var(--border-strong);
    border-radius: var(--radius);
}
.empty-state svg { width: 48px; height: 48px; margin-bottom: 12px; opacity: 0.4; }
.empty-state p { font-size: 0.95rem; }

/* ========== MC 战迹 ========== */
.mc-stats {
    display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 16px; margin-bottom: 24px;
}
.stat-card {
    display: flex; align-items: center; gap: 16px;
    background: var(--bg-card); backdrop-filter: blur(12px);
    border: 1px solid var(--border); border-radius: var(--radius);
    padding: 20px; transition: all 0.3s var(--ease);
}
.stat-card:hover { transform: translateY(-3px); box-shadow: var(--shadow); }
.stat-icon {
    width: 56px; height: 56px; border-radius: 16px;
    display: grid; place-items: center; color: white; flex-shrink: 0;
    box-shadow: 0 8px 20px rgba(0,0,0,0.15);
    overflow: hidden;
}
.stat-icon svg { width: 100%; height: 100%; }
.stat-icon.ender-eye {
    background: radial-gradient(circle at 50% 50%, #312e81, #1e1b4b);
    box-shadow: 0 8px 20px rgba(99,102,241,0.4);
}
.stat-icon.mc-bed {
    background: linear-gradient(135deg, #991b1b, #7f1d1d);
    box-shadow: 0 8px 20px rgba(220,38,38,0.4);
}
.stat-label { display: block; font-size: 0.85rem; color: var(--text-soft); margin-bottom: 2px; }
.stat-value { display: block; font-size: 1.25rem; font-weight: 700; color: var(--text); }

/* ========== 后台管理 ========== */
.admin-login {
    display: flex; justify-content: center; align-items: center;
    min-height: calc(100vh - 200px); padding: 40px 0;
}
.login-card {
    background: var(--bg-card); backdrop-filter: blur(12px);
    border: 1px solid var(--border); border-radius: var(--radius);
    padding: 40px; width: 100%; max-width: 400px; text-align: center;
    box-shadow: var(--shadow);
}
.login-icon {
    width: 64px; height: 64px; margin: 0 auto 16px;
    border-radius: 20px; display: grid; place-items: center;
    background: linear-gradient(135deg, var(--primary), var(--primary-2));
    color: white; box-shadow: 0 10px 24px var(--primary-glow);
}
.login-card h2 { font-size: 1.4rem; margin-bottom: 6px; }
.login-card p { color: var(--text-soft); font-size: 0.9rem; margin-bottom: 20px; }
#loginForm { display: flex; flex-direction: column; gap: 14px; }
#adminPwd {
    padding: 12px 16px; border-radius: 10px; border: 1px solid var(--border-strong);
    font-size: 1rem; outline: none; transition: all 0.3s var(--ease);
}
#adminPwd:focus { border-color: var(--primary); box-shadow: 0 0 0 3px var(--primary-glow); }
.login-msg { margin-top: 12px; font-size: 0.85rem; min-height: 20px; }
.login-msg.error { color: var(--danger); }

.admin-tabs {
    display: flex; gap: 8px; margin-bottom: 24px; flex-wrap: wrap;
    padding: 8px; background: var(--bg-soft); border-radius: 14px;
    border: 1px solid var(--border);
}
.admin-tab {
    padding: 10px 18px; border-radius: 10px; font-size: 0.9rem; font-weight: 500;
    color: var(--text-soft); transition: all 0.3s var(--ease);
}
.admin-tab:hover { background: white; color: var(--text); }
.admin-tab.active { background: white; color: var(--primary); box-shadow: var(--shadow-sm); }
.admin-tab.logout { margin-left: auto; color: var(--danger); }
.admin-tab.logout:hover { background: var(--danger); color: white; }

.admin-tab-content { display: none; animation: fadeIn 0.4s var(--ease); }
.admin-tab-content.active { display: block; }
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }

.upload-area {
    border: 2px dashed var(--border-strong); border-radius: var(--radius);
    padding: 40px 20px; text-align: center; color: var(--text-soft);
    cursor: pointer; transition: all 0.3s var(--ease); margin-bottom: 20px;
    background: var(--bg-soft);
}
.upload-area:hover, .upload-area.dragover {
    border-color: var(--primary); background: rgba(37,99,235,0.04); color: var(--primary);
}
.upload-area svg { width: 40px; height: 40px; margin-bottom: 10px; opacity: 0.5; }

.admin-list { display: flex; flex-direction: column; gap: 10px; }
.admin-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); gap: 12px; }
.admin-img-card {
    position: relative; border-radius: 12px; overflow: hidden; aspect-ratio: 1;
    background: var(--bg-soft); border: 1px solid var(--border);
}
.admin-img-card img { width: 100%; height: 100%; object-fit: cover; }
.admin-img-del {
    position: absolute; top: 6px; right: 6px;
    width: 28px; height: 28px; border-radius: 8px;
    background: rgba(239,68,68,0.9); color: white;
    display: grid; place-items: center; font-size: 1.1rem;
    opacity: 0; transition: opacity 0.2s;
}
.admin-img-card:hover .admin-img-del { opacity: 1; }

.stat-edit {
    background: var(--bg-card); border: 1px solid var(--border);
    border-radius: var(--radius); padding: 24px; margin-bottom: 16px;
}
.stat-edit h3 { margin-bottom: 16px; }
.stat-row {
    display: flex; align-items: center; gap: 16px; margin-bottom: 12px;
}
.stat-row label { width: 60px; color: var(--text-soft); font-size: 0.9rem; }
.stat-row input {
    flex: 1; padding: 10px 14px; border-radius: 10px;
    border: 1px solid var(--border-strong); font-size: 1rem; outline: none;
    transition: all 0.3s var(--ease);
}
.stat-row input:focus { border-color: var(--primary); box-shadow: 0 0 0 3px var(--primary-glow); }
.save-msg { margin-top: 12px; font-size: 0.85rem; color: var(--success); min-height: 20px; }

/* ========== 模态框 ========== */
.modal {
    position: fixed; inset: 0; z-index: 200;
    background: rgba(0, 0, 0, 0.92); backdrop-filter: blur(8px);
    display: none; align-items: center; justify-content: center;
    padding: 24px; animation: fadeIn 0.3s var(--ease);
}
.modal.active { display: flex; }
.modal img {
    max-width: 90%; max-height: 85vh; border-radius: 12px;
    box-shadow: 0 30px 80px rgba(0,0,0,0.5);
    animation: zoomIn 0.3s var(--ease);
}
.modal-close {
    position: absolute; top: 24px; right: 24px;
    width: 44px; height: 44px; border-radius: 50%;
    background: rgba(255,255,255,0.15); color: white;
    font-size: 1.5rem; display: grid; place-items: center;
    transition: all 0.3s var(--ease);
}
.modal-close:hover { background: rgba(255,255,255,0.3); transform: rotate(90deg); }

/* ========== Toast ========== */
.toast {
    position: fixed; bottom: 32px; left: 50%; transform: translateX(-50%) translateY(100px);
    background: var(--text); color: white; padding: 12px 24px; border-radius: 10px;
    font-size: 0.9rem; z-index: 300; opacity: 0;
    transition: all 0.4s var(--ease); box-shadow: var(--shadow-lg);
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }
.toast.success { background: var(--success); }
.toast.error { background: var(--danger); }

/* ========== 动画工具 ========== */
[data-anim] { opacity: 0; }
[data-anim].animated { opacity: 1; }
[data-anim="slide-up"] { transform: translateY(30px); transition: all 0.7s var(--ease); }
[data-anim="slide-up"].animated { transform: translateY(0); }
[data-anim="fade-up"] { transform: translateY(20px); transition: all 0.6s var(--ease); }
[data-anim="fade-up"].animated { transform: translateY(0); }
[data-anim="scale-in"] { transform: scale(0.85); transition: all 0.5s var(--ease); }
[data-anim="scale-in"].animated { transform: scale(1); }

/* ========== 响应式 ========== */
@media (max-width: 768px) {
    .nav-menu {
        position: fixed; top: 64px; left: 0; right: 0;
        flex-direction: column; background: rgba(255,255,255,0.95);
        backdrop-filter: blur(20px); padding: 16px; gap: 4px;
        border-bottom: 1px solid var(--border);
        transform: translateY(-120%); transition: transform 0.4s var(--ease);
    }
    .nav-menu.open { transform: translateY(0); }
    .nav-toggle { display: flex; }
    .hero-logo-wrap { width: 200px; height: 200px; }
    .logo-inner { font-size: 3.5rem; }
    .page { padding: 32px 16px 60px; }
}

/* ========== 通用分段选项卡 ========== */
.seg-tabs {
    display: flex; justify-content: center; gap: 6px;
    margin: 8px auto 32px; padding: 6px;
    background: var(--bg-soft); border: 1px solid var(--border);
    border-radius: 14px; width: fit-content; max-width: 100%;
}
.seg-tab {
    padding: 9px 26px; border-radius: 9px; font-size: 0.95rem; font-weight: 600;
    color: var(--text-soft); transition: all 0.3s var(--ease);
}
.seg-tab:hover { color: var(--text); }
.seg-tab.active {
    background: #fff; color: var(--primary);
    box-shadow: 0 2px 8px rgba(15,23,42,0.08);
}

.seg-group {
    display: flex; gap: 4px; padding: 4px;
    background: var(--bg-soft); border: 1px solid var(--border);
    border-radius: 12px;
}
.seg-btn {
    flex: 1; padding: 9px 12px; border-radius: 9px; font-size: 0.9rem; font-weight: 600;
    color: var(--text-soft); transition: all 0.3s var(--ease); white-space: nowrap;
}
.seg-btn:hover { color: var(--text); }
.seg-btn.active {
    background: linear-gradient(135deg, var(--primary), var(--primary-2));
    color: #fff; box-shadow: 0 4px 12px var(--primary-glow);
}

.gpanel, .tpanel { display: none; }
.gpanel.active, .tpanel.active {
    display: block;
    animation: panelIn 0.45s var(--ease);
}
@keyframes panelIn {
    from { opacity: 0; transform: translateY(14px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ========== 游戏页通用 ========== */
.game-layout {
    display: grid; grid-template-columns: minmax(0, 1fr) 280px;
    gap: 24px; align-items: start;
}
.game-card {
    background: var(--bg-card); border: 1px solid var(--border);
    border-radius: var(--radius); padding: 20px;
    box-shadow: var(--shadow-sm);
    display: flex; justify-content: center;
}
.game-side {
    background: var(--bg-card); border: 1px solid var(--border);
    border-radius: var(--radius); padding: 22px;
    box-shadow: var(--shadow-sm);
    display: flex; flex-direction: column; gap: 16px;
}
.side-actions { display: flex; gap: 10px; }
.side-actions .btn { flex: 1; justify-content: center; padding: 10px 14px; font-size: 0.9rem; }
.side-tip { font-size: 0.82rem; color: var(--text-mute); line-height: 1.6; }

/* 五子棋 */
.gomoku-wrap { width: 100%; max-width: 600px; aspect-ratio: 1; position: relative; }
#gomokuCanvas { width: 100%; height: 100%; display: block; cursor: pointer; border-radius: 12px; }
.status-pill {
    text-align: center; padding: 10px 16px; border-radius: 12px;
    background: rgba(37,99,235,0.07); color: var(--primary);
    font-weight: 700; font-size: 0.95rem;
}
.status-pill.win { background: rgba(16,185,129,0.1); color: var(--success); }
.status-pill.thinking { background: rgba(99,102,241,0.08); color: var(--primary-2); }
.stone-legend { display: flex; flex-direction: column; gap: 8px; font-size: 0.88rem; color: var(--text-soft); }
.stone-legend > div { display: flex; align-items: center; gap: 10px; }
.stone-dot {
    width: 18px; height: 18px; border-radius: 50%; display: inline-block;
    box-shadow: 0 2px 5px rgba(15,23,42,0.25);
}
.stone-dot.black { background: radial-gradient(circle at 32% 30%, #475569, #0f172a 70%); }
.stone-dot.white { background: radial-gradient(circle at 32% 30%, #fff, #cbd5e1 80%); border: 1px solid var(--border-strong); }

/* 贪吃蛇 */
.snake-wrap { width: 100%; max-width: 520px; aspect-ratio: 1; position: relative; }
#snakeCanvas { width: 100%; height: 100%; display: block; border-radius: 12px; }
.snake-overlay {
    position: absolute; inset: 0; border-radius: 12px;
    background: rgba(255,255,255,0.86); backdrop-filter: blur(6px);
    display: flex; flex-direction: column; align-items: center; justify-content: center;
    gap: 14px; transition: opacity 0.3s var(--ease);
}
.snake-overlay.hidden { opacity: 0; pointer-events: none; }
.snake-overlay-title { font-size: 1.6rem; font-weight: 800; background: linear-gradient(135deg, var(--primary), var(--primary-2)); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; }
.snake-overlay-sub { color: var(--text-soft); font-size: 0.9rem; }
.score-row { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.score-box {
    background: var(--bg-soft); border: 1px solid var(--border);
    border-radius: 12px; padding: 12px; text-align: center;
    display: flex; flex-direction: column; gap: 2px;
}
.score-box strong { font-size: 1.5rem; font-weight: 800; color: var(--primary); }
.score-label { font-size: 0.78rem; color: var(--text-mute); }
.dpad {
    display: grid; grid-template-columns: repeat(3, 52px); grid-template-rows: repeat(3, 52px);
    gap: 6px; justify-content: center; margin-top: 2px;
    -webkit-user-select: none; user-select: none;
}
.dpad-btn {
    background: #fff; border: 1px solid var(--border-strong); border-radius: 12px;
    color: var(--primary); font-size: 1rem; transition: all 0.15s var(--ease);
    display: grid; place-items: center;
}
.dpad-btn:hover { background: rgba(37,99,235,0.08); }
.dpad-btn:active { transform: scale(0.92); background: rgba(37,99,235,0.15); }
.dpad-btn.up { grid-column: 2; grid-row: 1; }
.dpad-btn.left { grid-column: 1; grid-row: 2; }
.dpad-btn.down { grid-column: 2; grid-row: 3; }
.dpad-btn.right { grid-column: 3; grid-row: 2; }

/* ========== 计算器 ========== */
.calc-card {
    max-width: 400px; margin: 0 auto;
    background: var(--bg-card); border: 1px solid var(--border);
    border-radius: var(--radius); padding: 22px; box-shadow: var(--shadow);
}
.calc-expr { min-height: 24px; text-align: right; color: var(--text-mute); font-size: 0.9rem; word-break: break-all; }
.calc-display {
    text-align: right; font-size: 2.6rem; font-weight: 700; letter-spacing: -1px;
    padding: 6px 4px 16px; color: var(--text);
    overflow-x: auto; white-space: nowrap;
}
.calc-keys { display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; }
.ck {
    aspect-ratio: 1.25; border-radius: 14px; font-size: 1.15rem; font-weight: 600;
    background: var(--bg-soft); color: var(--text);
    border: 1px solid var(--border);
    transition: all 0.15s var(--ease);
}
.ck:hover { transform: translateY(-2px); box-shadow: var(--shadow-sm); border-color: var(--border-strong); }
.ck:active { transform: scale(0.95); }
.ck.fn { background: rgba(37,99,235,0.08); color: var(--primary); }
.ck.op { background: rgba(79,70,229,0.1); color: var(--primary-2); font-size: 1.25rem; }
.ck.zero { grid-column: span 2; aspect-ratio: auto; }
.ck.eq {
    background: linear-gradient(135deg, var(--primary), var(--primary-2));
    color: #fff; border: none; box-shadow: 0 6px 16px var(--primary-glow);
}
.ck.error { animation: calcShake 0.35s var(--ease); }
@keyframes calcShake {
    0%,100% { transform: translateX(0); }
    25% { transform: translateX(-6px); }
    75% { transform: translateX(6px); }
}

/* ========== 函数绘图 ========== */
.plot-card {
    background: var(--bg-card); border: 1px solid var(--border);
    border-radius: var(--radius); padding: 22px; box-shadow: var(--shadow-sm);
    display: grid; grid-template-columns: 260px minmax(0,1fr); gap: 22px;
}
.plot-controls { display: flex; flex-direction: column; gap: 12px; }
.plot-field { display: flex; align-items: center; gap: 8px; position: relative; }
.plot-field label { font-weight: 600; color: var(--text-soft); font-size: 0.9rem; min-width: 34px; }
.plot-field input {
    flex: 1; padding: 10px 12px; border-radius: 10px; font-size: 0.92rem;
    border: 1px solid var(--border-strong); background: #fff; color: var(--text);
    transition: border-color 0.25s, box-shadow 0.25s;
}
.plot-field input:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px rgba(37,99,235,0.12); }
.plot-field .plot-color { width: 12px; height: 12px; border-radius: 50%; position: absolute; right: 10px; pointer-events: none; }
.plot-color.c1 { background: #2563eb; }
.plot-color.c2 { background: #ef4444; }
.plot-range { display: flex; gap: 8px; align-items: flex-end; }
.plot-field.small { flex: 1; }
.plot-field.small label { min-width: 0; font-size: 0.78rem; white-space: nowrap; }
.plot-hint { font-size: 0.78rem; color: var(--text-mute); line-height: 1.6; }
.plot-hint code { background: var(--bg-soft); padding: 1px 6px; border-radius: 6px; font-size: 0.76rem; color: var(--primary-2); }
.plot-canvas-wrap {
    background: #fff; border: 1px solid var(--border); border-radius: var(--radius-sm);
    overflow: hidden; min-height: 300px; display: flex;
}
#plotCanvas { width: 100%; height: auto; display: block; }

/* ========== 方程计算 ========== */
.eq-card {
    max-width: 640px; margin: 0 auto;
    background: var(--bg-card); border: 1px solid var(--border);
    border-radius: var(--radius); padding: 26px; box-shadow: var(--shadow);
    display: flex; flex-direction: column; gap: 18px;
}
.eq-desc { font-size: 0.88rem; color: var(--text-soft); }
.eq-desc code { background: var(--bg-soft); padding: 1px 6px; border-radius: 6px; color: var(--primary-2); }
.eq-pane { display: none; flex-direction: column; gap: 12px; }
.eq-pane.active { display: flex; animation: panelIn 0.4s var(--ease); }
.eq-input-row { display: flex; gap: 10px; }
.eq-input-row input {
    flex: 1; padding: 12px 14px; border-radius: 12px; font-size: 1rem;
    border: 1px solid var(--border-strong); background: #fff; color: var(--text);
    transition: border-color 0.25s, box-shadow 0.25s;
}
.eq-input-row input:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px rgba(37,99,235,0.12); }
.eq-result {
    background: var(--bg-soft); border: 1px dashed var(--border-strong);
    border-radius: var(--radius-sm); padding: 18px; font-size: 0.95rem;
    color: var(--text); line-height: 1.9; min-height: 60px;
}
.eq-result.err { color: var(--danger); border-color: rgba(239,68,68,0.4); background: rgba(239,68,68,0.05); }
.eq-result .eq-answer { font-weight: 800; color: var(--primary); font-size: 1.08rem; }
.eq-result .eq-step { color: var(--text-soft); font-size: 0.86rem; }

/* ========== AI 对话 ========== */
.ai-card {
    max-width: 860px; margin: 0 auto;
    background: var(--bg-card); border: 1px solid var(--border);
    border-radius: var(--radius); box-shadow: var(--shadow);
    display: flex; flex-direction: column; overflow: hidden;
    height: calc(100vh - 220px); min-height: 460px; max-height: 720px;
}
.ai-topbar {
    display: flex; align-items: center; justify-content: space-between;
    padding: 12px 18px; border-bottom: 1px solid var(--border); background: rgba(255,255,255,0.6);
}
.ai-select {
    padding: 8px 12px; border-radius: 10px; border: 1px solid var(--border-strong);
    background: #fff; color: var(--text); font-size: 0.88rem; font-weight: 600;
    cursor: pointer;
}
.ai-clear { padding: 7px 16px; font-size: 0.85rem; }
.ai-messages {
    flex: 1; overflow-y: auto; padding: 22px;
    display: flex; flex-direction: column; gap: 18px;
    scroll-behavior: smooth;
}
.ai-msg { display: flex; gap: 12px; max-width: 82%; animation: msgIn 0.35s var(--ease); }
@keyframes msgIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}
.ai-msg.user { align-self: flex-end; flex-direction: row-reverse; }
.ai-avatar {
    flex-shrink: 0; width: 36px; height: 36px; border-radius: 10px;
    display: grid; place-items: center; font-size: 0.75rem; font-weight: 800; color: #fff;
    background: linear-gradient(135deg, var(--primary), var(--primary-2));
}
.ai-msg.user .ai-avatar { background: linear-gradient(135deg, #06b6d4, #0891b2); }
.ai-bubble {
    padding: 12px 16px; border-radius: 14px; font-size: 0.93rem; line-height: 1.7;
    white-space: pre-wrap; word-break: break-word;
}
.ai-msg.ai .ai-bubble {
    background: #fff; border: 1px solid var(--border);
    border-top-left-radius: 4px; box-shadow: var(--shadow-sm);
}
.ai-msg.user .ai-bubble {
    background: linear-gradient(135deg, var(--primary), var(--primary-2));
    color: #fff; border-top-right-radius: 4px;
}
.ai-bubble code, .ai-bubble pre {
    font-family: 'Consolas', 'Menlo', monospace; font-size: 0.85rem;
}
.ai-bubble pre {
    background: #0f172a; color: #e2e8f0; padding: 12px 14px; border-radius: 10px;
    overflow-x: auto; margin: 8px 0;
}
.ai-bubble :not(pre) > code {
    background: rgba(15,23,42,0.07); padding: 2px 6px; border-radius: 6px;
}
.ai-msg.user .ai-bubble :not(pre) > code { background: rgba(255,255,255,0.22); color: #fff; }
.ai-typing { display: inline-flex; gap: 5px; padding: 4px 2px; }
.ai-typing span {
    width: 7px; height: 7px; border-radius: 50%; background: var(--text-mute);
    animation: typingDot 1.2s infinite ease-in-out;
}
.ai-typing span:nth-child(2) { animation-delay: 0.15s; }
.ai-typing span:nth-child(3) { animation-delay: 0.3s; }
@keyframes typingDot {
    0%, 60%, 100% { transform: translateY(0); opacity: 0.4; }
    30% { transform: translateY(-5px); opacity: 1; }
}
.ai-input-bar {
    display: flex; gap: 10px; padding: 14px 18px;
    border-top: 1px solid var(--border); background: rgba(255,255,255,0.6);
}
#aiInput {
    flex: 1; resize: none; max-height: 140px;
    padding: 11px 14px; border-radius: 12px; font-size: 0.93rem; line-height: 1.5;
    border: 1px solid var(--border-strong); background: #fff; color: var(--text);
    transition: border-color 0.25s, box-shadow 0.25s;
}
#aiInput:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px rgba(37,99,235,0.12); }
#aiSend { align-self: flex-end; }
#aiSend:disabled { opacity: 0.55; cursor: not-allowed; transform: none; }

/* ========== 新页面响应式 ========== */
@media (max-width: 900px) {
    .game-layout { grid-template-columns: 1fr; }
    .plot-card { grid-template-columns: 1fr; }
}
@media (max-width: 768px) {
    .seg-tab { padding: 8px 18px; font-size: 0.88rem; }
    .calc-display { font-size: 2.1rem; }
    .ai-card { height: calc(100vh - 200px); }
    .ai-msg { max-width: 92%; }
}

/* ========== 忘记密码 / 通用弹窗 ========== */
.login-forgot {
    display: block; margin: 6px auto 0; background: none;
    color: var(--text-mute); font-size: 0.83rem;
    transition: color 0.25s;
}
.login-forgot:hover { color: var(--primary); }
.site-dialog-mask {
    position: fixed; inset: 0; z-index: 300;
    background: rgba(0,0,0,0.5); backdrop-filter: blur(4px);
    display: grid; place-items: center; padding: 24px;
    animation: dialogMaskIn 0.25s var(--ease);
}
@keyframes dialogMaskIn { from { opacity: 0; } to { opacity: 1; } }
.site-dialog {
    background: #fff; border-radius: 18px; padding: 28px 26px 22px;
    max-width: 360px; width: 100%; text-align: center;
    box-shadow: var(--shadow-lg);
    animation: dialogIn 0.35s var(--ease);
}
@keyframes dialogIn {
    from { opacity: 0; transform: translateY(18px) scale(0.96); }
    to { opacity: 1; transform: translateY(0) scale(1); }
}
.site-dialog-icon {
    width: 54px; height: 54px; margin: 0 auto 14px; border-radius: 50%;
    display: grid; place-items: center; font-size: 1.6rem;
    background: rgba(245,158,11,0.12);
}
.site-dialog h3 { font-size: 1.08rem; margin-bottom: 8px; }
.site-dialog p { color: var(--text-soft); font-size: 0.9rem; margin-bottom: 20px; }
.site-dialog .btn { min-width: 120px; justify-content: center; }