/* ============================================================
   index.css v4.0 - 首页专属样式
   C++信息学奥赛代码打字闯关训练系统
   ============================================================ */

/* ===== 通用容器 ===== */
.section-container { max-width: 1280px; margin: 0 auto; padding: 0 1.5rem; }
.section-header { margin-bottom: 2rem; }
.section-header.text-center { text-align: center; }
.section-title {
    display: flex; align-items: center; gap: 0.75rem;
    font-size: 1.5rem; font-weight: 900; color: #1e293b;
}
.section-title.justify-center { justify-content: center; }
.section-icon {
    width: 2.5rem; height: 2.5rem; border-radius: 0.75rem;
    display: flex; align-items: center; justify-content: center;
    flex-shrink: 0; font-size: 1rem;
}
.section-tag {
    font-size: 0.7rem; font-weight: 700; background: #f1f5f9; color: #64748b;
    padding: 0.25rem 0.75rem; border-radius: 999px; letter-spacing: 0.05em;
}
.section-desc { color: #94a3b8; font-size: 0.9rem; margin-top: 0.5rem; }

/* ===== 动画关键帧 ===== */
@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(30px); }
    to { opacity: 1; transform: translateY(0); }
}
@keyframes gradientShift {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}
@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-12px); }
}
@keyframes pulse-ring {
    0%, 100% { box-shadow: 0 0 0 0 rgba(14,165,233,0.4); }
    50% { box-shadow: 0 0 0 14px rgba(14,165,233,0); }
}
@keyframes shimmer {
    0% { background-position: -200% 0; }
    100% { background-position: 200% 0; }
}
@keyframes spin-slow {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}
@keyframes badge-float {
    0%, 100% { transform: translateY(0) scale(1); }
    50% { transform: translateY(-6px) scale(1.05); }
}

.animate-fadeInUp { animation: fadeInUp 0.7s cubic-bezier(0.34,1.56,0.64,1) both; }
.gradient-shine {
    background: linear-gradient(90deg, #0ea5e9, #8b5cf6, #0ea5e9);
    background-size: 200% auto;
    -webkit-background-clip: text; background-clip: text;
    -webkit-text-fill-color: transparent;
    animation: shimmer 4s linear infinite;
}

/* ===== Scroll Reveal ===== */
.reveal-item { opacity: 0; transform: translateY(30px); transition: all 0.6s cubic-bezier(0.34,1.56,0.64,1); }
.reveal-item.revealed { opacity: 1; transform: translateY(0); }

/* ============================================================
   HERO SECTION v4.0
   ============================================================ */
.hero-section {
    position: relative; overflow: hidden;
    min-height: 100vh; display: flex; align-items: center; justify-content: center;
    background: linear-gradient(160deg, #f0f9ff 0%, #e0f2fe 25%, #f5f3ff 55%, #fef3c7 85%, #f0f9ff 100%);
    padding: 5rem 1rem;
}
.hero-canvas {
    position: absolute; inset: 0; width: 100%; height: 100%;
    pointer-events: none; z-index: 1;
}
.hero-orb {
    position: absolute; border-radius: 50%;
    filter: blur(80px); pointer-events: none; z-index: 0;
    animation: float 8s ease-in-out infinite;
}
.hero-orb-1 { width: 500px; height: 500px; background: rgba(14,165,233,0.12); top: -100px; left: -80px; animation-delay: 0s; }
.hero-orb-2 { width: 400px; height: 400px; background: rgba(139,92,246,0.10); top: 30%; right: -60px; animation-delay: 2s; }
.hero-orb-3 { width: 350px; height: 350px; background: rgba(16,185,129,0.08); bottom: -60px; left: 30%; animation-delay: 4s; }
.hero-grid {
    position: absolute; inset: 0; pointer-events: none; z-index: 0;
    background-image: radial-gradient(circle, #0ea5e9 1px, transparent 1px);
    background-size: 44px 44px; opacity: 0.04;
}
.hero-inner {
    position: relative; z-index: 10; text-align: center; max-width: 800px;
}
.hero-badge {
    display: inline-flex; align-items: center; gap: 0.6rem;
    background: rgba(255,255,255,0.85); border: 2px solid #bae6fd;
    border-radius: 999px; padding: 0.5rem 1.25rem; margin-bottom: 1.5rem;
    backdrop-filter: blur(16px); font-size: 0.85rem; font-weight: 600;
    color: #334155; box-shadow: 0 4px 16px rgba(14,165,233,0.08);
}
.hero-badge-dot {
    display: inline-flex; width: 10px; height: 10px; border-radius: 50%; background: #10b981;
    animation: pulse-ring 2s infinite; position: relative;
}
.hero-title {
    font-size: clamp(2rem, 6vw, 4.5rem); font-weight: 900;
    line-height: 1.15; margin-bottom: 1.25rem;
    font-family: 'Noto Sans SC', sans-serif;
}
.hero-title-line2 { display: block; color: #0f172a; }
.hero-subtitle {
    font-size: clamp(0.95rem, 2vw, 1.2rem); color: #64748b; line-height: 1.7;
    max-width: 600px; margin: 0 auto 1.5rem;
}
.hero-subtitle strong { color: #0ea5e9; font-weight: 700; }
.hero-status { margin-bottom: 2rem; }
.status-tag {
    display: inline-block; padding: 0.4rem 1.2rem; border-radius: 999px;
    font-size: 0.8rem; font-weight: 700; border: 1.5px solid;
}
.tag-guest  { background: #fffbeb; color: #b45309; border-color: #fde68a; }
.tag-vip    { background: #f5f3ff; color: #7c3aed; border-color: #ddd6fe; }
.tag-free   { background: #f0f9ff; color: #0369a1; border-color: #bae6fd; }

.hero-cta {
    display: flex; flex-wrap: wrap; justify-content: center; gap: 0.9rem; margin-bottom: 3.5rem;
}
.cta-btn {
    display: inline-flex; align-items: center; gap: 0.6rem;
    font-weight: 700; font-size: 1rem; border-radius: 1rem;
    padding: 0.9rem 1.8rem; text-decoration: none;
    transition: all 0.3s cubic-bezier(0.4,0,0.2,1);
    position: relative; overflow: hidden;
}
.cta-btn:active { transform: scale(0.95); }
.cta-primary {
    background: linear-gradient(135deg, #0ea5e9, #2563eb);
    color: #fff; box-shadow: 0 8px 28px rgba(14,165,233,0.3);
}
.cta-primary:hover {
    box-shadow: 0 12px 36px rgba(14,165,233,0.45);
    transform: translateY(-3px);
}
.cta-vip {
    background: linear-gradient(135deg, #f59e0b, #f97316, #f59e0b);
    color: #fff; box-shadow: 0 8px 28px rgba(245,158,11,0.3);
    background-size: 200% auto;
}
.cta-vip:hover {
    box-shadow: 0 12px 36px rgba(245,158,11,0.45);
    transform: translateY(-3px);
    animation: shimmer 1.5s linear infinite;
}
.cta-vip::after {
    content: ''; position: absolute; inset: 0;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
    transform: translateX(-100%); transition: transform 0.7s;
}
.cta-vip:hover::after { transform: translateX(100%); }

.hero-stats {
    display: flex; flex-wrap: wrap; justify-content: center; gap: 1rem;
}
.hero-stat-card {
    background: rgba(255,255,255,0.8); backdrop-filter: blur(12px);
    border: 1px solid #e2e8f0; border-radius: 1.25rem;
    padding: 1.25rem 1.5rem; min-width: 110px;
    box-shadow: 0 4px 16px rgba(15,23,42,0.04);
    transition: all 0.35s cubic-bezier(0.4,0,0.2,1); cursor: default;
}
.hero-stat-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 16px 40px rgba(15,23,42,0.1);
    border-color: #bae6fd;
}
.hero-stat-num {
    display: block; font-size: 2rem; font-weight: 900;
    font-family: 'JetBrains Mono', monospace;
    background: linear-gradient(135deg, #0ea5e9, #2563eb);
    -webkit-background-clip: text; background-clip: text;
    -webkit-text-fill-color: transparent;
}
.hero-stat-label {
    display: block; font-size: 0.75rem; color: #94a3b8; font-weight: 600;
    margin-top: 0.25rem; letter-spacing: 0.05em;
}

/* 波浪 */
.hero-wave {
    position: absolute; bottom: 0; left: 0; width: 100%; z-index: 5; line-height: 0;
}
.hero-wave svg { width: 100%; height: 60px; display: block; }

/* ============================================================
   DASHBOARD - 个人仪表盘
   ============================================================ */
.dashboard-section { padding: 3rem 0 1rem; }
.dash-grid {
    display: grid; grid-template-columns: 280px 1fr 220px;
    gap: 1.25rem; align-items: start;
}
.dash-card {
    background: #fff; border: 1px solid #e2e8f0; border-radius: 1.25rem;
    padding: 1.5rem; box-shadow: 0 4px 16px rgba(15,23,42,0.03);
    transition: all 0.35s cubic-bezier(0.4,0,0.2,1);
}
.dash-card:hover { box-shadow: 0 12px 32px rgba(15,23,42,0.08); transform: translateY(-3px); }

/* 进度圈 */
.dash-progress-card { text-align: center; }
.progress-ring-wrap { position: relative; display: inline-block; margin-bottom: 1rem; }
.progress-ring { width: 130px; height: 130px; transform: rotate(-90deg); }
.ring-bg { stroke: #e2e8f0; }
.ring-fill {
    stroke: #0ea5e9; stroke-linecap: round;
    transition: stroke-dashoffset 1.8s cubic-bezier(0.4,0,0.2,1);
}
.progress-ring-text {
    position: absolute; inset: 0; display: flex; flex-direction: column;
    align-items: center; justify-content: center;
}
.ring-num { font-size: 1.4rem; font-weight: 900; color: #0ea5e9; font-family: 'JetBrains Mono',monospace; }
.ring-label { font-size: 0.7rem; color: #94a3b8; font-weight: 600; }
.dash-level-info { font-size: 0.8rem; color: #64748b; }
.dash-level-badge {
    display: inline-block; background: #f0f9ff; color: #0369a1;
    font-weight: 800; font-size: 0.7rem; padding: 0.2rem 0.7rem;
    border-radius: 999px; margin-right: 0.4rem;
}

/* 统计四宫格 */
.dash-stats-card {
    display: grid; grid-template-columns: 1fr 1fr; gap: 1rem;
}
.dash-stat-item {
    display: flex; align-items: center; gap: 0.75rem;
    background: #f8fafc; border-radius: 0.9rem; padding: 0.85rem;
    transition: all 0.3s ease;
}
.dash-stat-item:hover { background: #f1f5f9; }
.dash-stat-icon {
    width: 2.5rem; height: 2.5rem; border-radius: 0.65rem;
    display: flex; align-items: center; justify-content: center;
    font-size: 1rem; flex-shrink: 0;
}
.icon-emerald { background: #d1fae5; color: #059669; }
.icon-sky     { background: #e0f2fe; color: #0284c7; }
.icon-violet  { background: #ede9fe; color: #7c3aed; }
.icon-amber   { background: #fef3c7; color: #d97706; }
.dash-stat-num { font-size: 1.2rem; font-weight: 800; color: #1e293b; line-height: 1.2; }
.dash-stat-sub { font-size: 0.7rem; color: #94a3b8; font-weight: 500; }

/* 快捷操作 */
.dash-card-title { font-size: 0.85rem; font-weight: 700; color: #475569; margin-bottom: 0.85rem; }
.dash-actions { display: flex; flex-direction: column; gap: 0.5rem; }
.dash-action-btn {
    display: flex; align-items: center; gap: 0.7rem;
    background: #f8fafc; border-radius: 0.75rem; padding: 0.65rem 0.85rem;
    text-decoration: none; font-size: 0.85rem; font-weight: 600; color: #334155;
    transition: all 0.25s ease;
}
.dash-action-btn:hover { background: #f1f5f9; transform: translateX(3px); }
.action-icon {
    width: 2rem; height: 2rem; border-radius: 0.5rem;
    display: flex; align-items: center; justify-content: center;
    font-size: 0.8rem; flex-shrink: 0;
}
.dash-action-vip {
    background: linear-gradient(135deg, #fef3c7, #fde68a);
    border: 1.5px solid #fcd34d;
}
.dash-action-vip:hover { background: linear-gradient(135deg, #fde68a, #fcd34d); }
.wrong-badge {
    background: #f43f5e; color: #fff; font-size: 0.65rem; font-weight: 800;
    padding: 0.1rem 0.45rem; border-radius: 999px; margin-left: auto;
}

/* ============================================================
   COUNTER - 平台实力数据条
   ============================================================ */
.counter-section { padding: 3rem 0; }
.counter-grid {
    display: flex; flex-wrap: wrap; justify-content: center; gap: 1.5rem;
}
.counter-item {
    text-align: center; flex: 1; min-width: 140px;
    background: #fff; border: 1px solid #e2e8f0; border-radius: 1.25rem;
    padding: 1.75rem 1.25rem;
    box-shadow: 0 4px 16px rgba(15,23,42,0.02);
    transition: all 0.35s cubic-bezier(0.4,0,0.2,1);
}
.counter-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 16px 40px rgba(15,23,42,0.08);
}
.counter-icon-box {
    width: 3rem; height: 3rem; border-radius: 0.9rem;
    display: inline-flex; align-items: center; justify-content: center;
    font-size: 1.15rem; margin-bottom: 0.75rem;
}
.counter-num {
    display: block; font-size: 2rem; font-weight: 900;
    font-family: 'JetBrains Mono', monospace;
    color: #0f172a; margin-bottom: 0.3rem;
}
.counter-label {
    font-size: 0.8rem; color: #94a3b8; font-weight: 600;
}

/* ============================================================
   DUAL SECTION - 排行榜+动态
   ============================================================ */
.dual-section { padding: 2rem 0 3rem; }
.dual-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1.5rem; }
.dual-panel {
    background: #fff; border: 1px solid #e2e8f0; border-radius: 1.25rem;
    padding: 1.5rem; box-shadow: 0 4px 16px rgba(15,23,42,0.02);
}

/* 排行榜 */
.leaderboard-list { max-height: 420px; overflow-y: auto; }
.lb-row {
    display: flex; align-items: center; gap: 0.75rem;
    padding: 0.75rem 0.5rem; border-radius: 0.75rem;
    transition: all 0.25s ease;
}
.lb-row:hover { background: #f8fafc; }
.lb-row.lb-top { background: linear-gradient(135deg, #fefce8, #fffbeb); }
.lb-row.lb-me { background: #f0f9ff; border: 1.5px solid #bae6fd; }
.lb-rank { font-size: 1.1rem; font-weight: 800; width: 2rem; text-align: center; color: #94a3b8; }
.lb-top .lb-rank { font-size: 1.3rem; }
.lb-avatar {
    width: 2.25rem; height: 2.25rem; border-radius: 0.6rem;
    background: linear-gradient(135deg, #0ea5e9, #8b5cf6);
    color: #fff; display: flex; align-items: center; justify-content: center;
    font-size: 0.8rem; font-weight: 800; flex-shrink: 0;
}
.lb-info { flex: 1; min-width: 0; }
.lb-name { display: block; font-size: 0.85rem; font-weight: 700; color: #1e293b; }
.lb-meta { display: block; font-size: 0.7rem; color: #94a3b8; }
.lb-vip {
    display: inline-block; font-size: 0.55rem; background: linear-gradient(135deg, #f59e0b, #f97316);
    color: #fff; padding: 0.05rem 0.35rem; border-radius: 999px; font-weight: 800;
}
.lb-points {
    font-size: 1rem; font-weight: 900; color: #f59e0b; font-family: 'JetBrains Mono',monospace;
    text-align: right; white-space: nowrap;
}
.lb-points span { font-size: 0.65rem; font-weight: 600; color: #d97706; margin-left: 2px; }

/* 活动动态 */
.activity-list { max-height: 420px; overflow-y: auto; }
.act-item {
    display: flex; align-items: flex-start; gap: 0.75rem;
    padding: 0.75rem 0.5rem; border-radius: 0.75rem;
    border-bottom: 1px solid #f1f5f9;
    transition: background 0.25s ease;
}
.act-item:hover { background: #f8fafc; }
.act-item:last-child { border-bottom: none; }
.act-avatar {
    width: 2.25rem; height: 2.25rem; border-radius: 0.6rem;
    background: linear-gradient(135deg, #10b981, #0ea5e9);
    color: #fff; display: flex; align-items: center; justify-content: center;
    font-size: 0.75rem; font-weight: 800; flex-shrink: 0;
}
.act-body { flex: 1; min-width: 0; }
.act-text { font-size: 0.82rem; color: #334155; margin-bottom: 0.2rem; }
.act-text strong { color: #1e293b; }
.act-text em { font-style: normal; color: #0ea5e9; font-weight: 600; }
.act-meta { font-size: 0.7rem; color: #94a3b8; }
.act-score {
    font-size: 0.85rem; font-weight: 800; color: #10b981;
    flex-shrink: 0; font-family: 'JetBrains Mono',monospace;
}

.empty-state { text-align: center; padding: 2.5rem 1rem; }

/* ============================================================
   ROADMAP - 学习路径
   ============================================================ */
.roadmap-section { padding: 3rem 0; }
.roadmap { max-width: 800px; margin: 0 auto; }
.roadmap-phase {
    background: #fff; border: 1px solid #e2e8f0; border-radius: 1.25rem;
    padding: 1.5rem; box-shadow: 0 4px 16px rgba(15,23,42,0.02);
    transition: all 0.35s ease;
}
.roadmap-phase:hover { box-shadow: 0 12px 32px rgba(15,23,42,0.08); transform: translateY(-2px); }
.phase-header { display: flex; align-items: center; gap: 0.75rem; margin-bottom: 1rem; }
.phase-badge {
    display: inline-flex; align-items: center; gap: 0.4rem;
    font-size: 0.85rem; font-weight: 800; padding: 0.35rem 0.9rem; border-radius: 0.5rem;
}
.phase-tag {
    font-size: 0.68rem; font-weight: 600; color: #64748b;
    background: #f1f5f9; padding: 0.25rem 0.65rem; border-radius: 999px;
}
.phase-tag.tag-lock { background: #f5f3ff; color: #7c3aed; }
.phase-steps {
    display: flex; flex-wrap: nowrap; align-items: center; gap: 0.5rem;
    overflow-x: auto; scrollbar-width: none;
    -webkit-overflow-scrolling: touch;
    padding-bottom: 2px;
}
.phase-steps::-webkit-scrollbar { display: none; }
.step {
    display: flex; align-items: center; gap: 0.4rem;
    background: linear-gradient(135deg, #f8fafc, #f1f5f9);
    border: 1px solid transparent;
    border-radius: 0.65rem; padding: 0.45rem 0.75rem;
    font-size: 0.8rem; font-weight: 600; color: #475569;
    transition: all 0.3s cubic-bezier(0.34,1.56,0.64,1);
    flex-shrink: 0; white-space: nowrap;
}
.step:hover {
    background: linear-gradient(135deg, #e0f2fe, #dbeafe);
    color: #0ea5e9; border-color: #bae6fd;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(14,165,233,0.12);
}
.step-dot {
    width: 8px; height: 8px; border-radius: 50%;
    background: linear-gradient(135deg, #0ea5e9, #38bdf8);
    box-shadow: 0 0 6px rgba(14,165,233,0.4);
    transition: all 0.3s ease;
}
.step:hover .step-dot {
    box-shadow: 0 0 10px rgba(14,165,233,0.7);
    transform: scale(1.3);
}
.step-arrow { font-size: 1.2rem; color: #cbd5e1; font-weight: 700; }

.roadmap-divider {
    display: flex; align-items: center; justify-content: center;
    padding: 0.5rem 0;
}
.divider-icon {
    width: 2.5rem; height: 2.5rem; border-radius: 50%;
    background: #f1f5f9; color: #94a3b8;
    display: flex; align-items: center; justify-content: center;
    font-size: 0.9rem; border: 2px solid #e2e8f0;
}

/* ============================================================
   FEATURES - 特色功能
   ============================================================ */
.features-section { padding: 3rem 0; }
.features-grid {
    display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.5rem;
}
.feature-card {
    position: relative; overflow: hidden;
    background: #fff; border: 1px solid #e2e8f0; border-radius: 1.25rem;
    padding: 1.75rem; cursor: default;
    box-shadow: 0 4px 16px rgba(15,23,42,0.02);
    transition: all 0.35s cubic-bezier(0.4,0,0.2,1);
}
.feature-card::before {
    content: ''; position: absolute; top: -3rem; right: -3rem;
    width: 8rem; height: 8rem; border-radius: 50%;
    background: radial-gradient(circle, rgba(14,165,233,0.06), transparent 70%);
    transition: transform 0.7s ease;
}
.feature-card:hover::before { transform: scale(2.5); }
.feature-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 20px 48px rgba(15,23,42,0.1);
    border-color: #bae6fd;
}
.feature-icon-box {
    width: 3.25rem; height: 3.25rem; border-radius: 1rem;
    display: flex; align-items: center; justify-content: center;
    margin-bottom: 1.25rem;
    transition: transform 0.4s cubic-bezier(0.34,1.56,0.64,1);
}
.feature-card:hover .feature-icon-box { transform: scale(1.12) rotate(6deg); }
.feature-icon-box svg { width: 1.4rem; height: 1.4rem; }
.feature-card h3 { font-size: 1.05rem; font-weight: 800; color: #1e293b; margin-bottom: 0.6rem; }
.feature-card p { font-size: 0.85rem; color: #64748b; line-height: 1.65; }
.feature-card p b { color: #0ea5e9; }

/* ============================================================
   KNOWLEDGE MAP - 知识点大纲
   ============================================================ */
.knowledge-section { padding: 3rem 0; }
.knowledge-group { margin-bottom: 2.5rem; }
.knowledge-group-header {
    display: flex; align-items: center; gap: 0.75rem; margin-bottom: 1rem;
}
.knowledge-group-header h3 { font-size: 1.15rem; font-weight: 800; display: flex; align-items: center; gap: 0.6rem; }
.kj-icon {
    width: 2.75rem; height: 2.75rem; border-radius: 0.8rem;
    display: flex; align-items: center; justify-content: center;
    font-size: 1.1rem; flex-shrink: 0;
}
.kj-j h3 { color: #059669; } .kj-j .kj-icon { background: #d1fae5; }
.kj-s h3 { color: #7c3aed; } .kj-s .kj-icon { background: #ede9fe; }
.kj-tag {
    font-size: 0.7rem; font-weight: 600; padding: 0.15rem 0.7rem;
    border-radius: 999px; background: #d1fae5; color: #065f46; margin-left: 0.4rem;
}
.kj-tag.tag-violet { background: #ede9fe; color: #5b21b6; }

.knowledge-grid {
    display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 0.75rem;
}
.kj-card {
    position: relative; overflow: hidden;
    display: block; text-decoration: none;
    background: #fff; border: 1px solid #e2e8f0; border-radius: 1rem;
    padding: 1.15rem; transition: all 0.35s cubic-bezier(0.4,0,0.2,1);
}
.kj-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 32px rgba(15,23,42,0.08);
}
.kj-card-j:hover { border-color: #6ee7b7; }
.kj-card-s:hover { border-color: #c4b5fd; }
.kj-card.kj-locked { opacity: 0.6; filter: grayscale(0.3); }
.kj-card.kj-locked:hover { opacity: 0.8; filter: none; }
.kj-card-top { display: flex; align-items: center; justify-content: space-between; margin-bottom: 0.5rem; }
.kj-num {
    font-size: 0.65rem; font-weight: 800; padding: 0.15rem 0.5rem;
    border-radius: 999px; background: #f1f5f9; color: #64748b;
}
.kj-icon-sm {
    width: 1.75rem; height: 1.75rem; border-radius: 0.4rem;
    display: flex; align-items: center; justify-content: center;
    font-size: 0.7rem; background: #f8fafc; color: #94a3b8;
    transition: all 0.3s ease;
}
.kj-card:hover .kj-icon-sm { background: #e0f2fe; color: #0ea5e9; }
.kj-card h4 { font-size: 0.88rem; font-weight: 700; color: #1e293b; margin-bottom: 0.3rem; }
.kj-card p {
    font-size: 0.72rem; color: #94a3b8; line-height: 1.5;
    display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
}
.kj-bar { height: 3px; background: #f1f5f9; border-radius: 3px; margin-top: 0.75rem; }
.kj-bar-fill { height: 100%; background: linear-gradient(90deg, #10b981, #0ea5e9); border-radius: 3px; transition: width 1s ease; }
.kj-lock {
    position: absolute; top: 0.75rem; right: 0.75rem;
    font-size: 0.65rem; color: #cbd5e1;
}

/* ============================================================
   BADGE WALL - 勋章墙
   ============================================================ */
.badge-section { padding: 3rem 0; }
.badge-grid {
    display: grid; grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); gap: 1rem;
}
.badge-card {
    background: #fff; border: 1px solid #e2e8f0; border-radius: 1.25rem;
    padding: 1.5rem 1rem; text-align: center;
    box-shadow: 0 4px 16px rgba(15,23,42,0.02);
    transition: all 0.35s cubic-bezier(0.34,1.56,0.64,1);
}
.badge-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 16px 40px rgba(15,23,42,0.1);
}
.badge-card:nth-child(odd):hover { border-color: #fcd34d; }
.badge-card:nth-child(even):hover { border-color: #c4b5fd; }
.badge-icon-wrap {
    width: 3.5rem; height: 3.5rem; border-radius: 50%;
    background: linear-gradient(135deg, #fef3c7, #fde68a);
    display: inline-flex; align-items: center; justify-content: center;
    margin-bottom: 0.75rem;
}
.badge-card:nth-child(4n+2) .badge-icon-wrap { background: linear-gradient(135deg, #dbeafe, #bfdbfe); }
.badge-card:nth-child(4n+3) .badge-icon-wrap { background: linear-gradient(135deg, #ede9fe, #ddd6fe); }
.badge-card:nth-child(4n) .badge-icon-wrap { background: linear-gradient(135deg, #d1fae5, #a7f3d0); }
.badge-medal { font-size: 1.4rem; color: #d97706; }
.badge-card:nth-child(4n+2) .badge-medal { color: #2563eb; }
.badge-card:nth-child(4n+3) .badge-medal { color: #7c3aed; }
.badge-card:nth-child(4n) .badge-medal { color: #059669; }
.badge-card h4 { font-size: 0.9rem; font-weight: 800; color: #1e293b; margin-bottom: 0.3rem; }
.badge-card p { font-size: 0.72rem; color: #94a3b8; line-height: 1.4; margin-bottom: 0.5rem; }
.badge-user { font-size: 0.68rem; color: #cbd5e1; }

/* ============================================================
   CTA - 底部号召
   ============================================================ */
.cta-section {
    position: relative; overflow: hidden;
    padding: 4rem 1rem; text-align: center;
    background: linear-gradient(180deg, transparent, rgba(14,165,233,0.04) 40%, rgba(139,92,246,0.03) 100%);
}
.cta-bg-orb {
    position: absolute; border-radius: 50%; pointer-events: none;
    filter: blur(100px); opacity: 0.4;
}
.cta-orb-1 { width: 400px; height: 400px; background: rgba(14,165,233,0.08); top: -50px; left: -100px; }
.cta-orb-2 { width: 300px; height: 300px; background: rgba(139,92,246,0.06); bottom: -50px; right: -80px; }
.cta-title {
    font-size: clamp(1.5rem, 4vw, 2.5rem); font-weight: 900; color: #0f172a;
    margin-bottom: 1rem; font-family: 'Noto Sans SC', sans-serif;
}
.cta-desc { font-size: 1rem; color: #64748b; margin-bottom: 2rem; }
.cta-desc strong { color: #0ea5e9; }
.cta-buttons { display: flex; flex-wrap: wrap; justify-content: center; gap: 1rem; }

/* ============================================================
   RESPONSIVE - 移动端适配
   ============================================================ */
@media (max-width: 1024px) {
    .dash-grid { grid-template-columns: 1fr 1fr; }
    .dash-progress-card { grid-column: 1 / -1; }
    .dash-actions-card { grid-column: 1 / -1; }
    .dash-actions { flex-direction: row; flex-wrap: wrap; }
    .dash-action-btn { flex: 1; min-width: 120px; }
    .features-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
    .hero-section { min-height: auto; padding: 4rem 1rem 3rem; }
    .hero-orb-1 { width: 300px; height: 300px; }
    .hero-orb-2 { width: 250px; height: 250px; }
    .hero-stats { gap: 0.6rem; }
    .hero-stat-card { min-width: 80px; padding: 0.9rem 0.9rem; }
    .hero-stat-num { font-size: 1.4rem; }

    .dash-grid { grid-template-columns: 1fr; }
    .dash-stats-card { grid-template-columns: 1fr 1fr; }

    .dual-grid { grid-template-columns: 1fr; }

    .features-grid { grid-template-columns: 1fr; }

    .knowledge-grid { grid-template-columns: repeat(2, 1fr); }

    .badge-grid { grid-template-columns: repeat(2, 1fr); }

    .counter-item { min-width: 120px; padding: 1.25rem 0.75rem; }
    .counter-num { font-size: 1.5rem; }

    .roadmap-phase { padding: 1rem; }
    .phase-steps { gap: 0.35rem; overflow-x: auto; }
    .step { font-size: 0.72rem; padding: 0.35rem 0.55rem; }
    .step-connector svg { width: 16px; height: 10px; }

    .cta-title { font-size: 1.6rem; }
    .cta-buttons { flex-direction: column; align-items: center; }
    .cta-btn { width: 100%; max-width: 300px; justify-content: center; }

    .section-title { font-size: 1.25rem; }
    .section-icon { width: 2rem; height: 2rem; font-size: 0.85rem; }
}

@media (max-width: 480px) {
    .section-container { padding: 0 1rem; }

    .hero-badge { font-size: 0.72rem; padding: 0.4rem 0.9rem; }
    .hero-title { font-size: 1.6rem; }
    .hero-subtitle { font-size: 0.85rem; }
    .hero-cta { flex-direction: column; align-items: center; }
    .cta-btn { width: 100%; max-width: 260px; justify-content: center; font-size: 0.9rem; padding: 0.75rem 1.2rem; }
    .hero-stats { flex-wrap: wrap; }
    .hero-stat-card { min-width: 70px; padding: 0.7rem 0.7rem; }
    .hero-stat-num { font-size: 1.2rem; }

    .hero-wave svg { height: 30px; }

    .dash-stats-card { grid-template-columns: 1fr; }
    .dash-stat-item { padding: 0.7rem; }

    .counter-grid { gap: 0.6rem; }
    .counter-item { min-width: 90px; padding: 1rem 0.5rem; border-radius: 0.9rem; }
    .counter-num { font-size: 1.25rem; }
    .counter-icon-box { width: 2.25rem; height: 2.25rem; border-radius: 0.6rem; font-size: 0.9rem; }

    .knowledge-grid { grid-template-columns: 1fr; }
    .kj-card { padding: 0.9rem; }
    .kj-card h4 { font-size: 0.82rem; }

    .badge-grid { grid-template-columns: 1fr; }

    .lb-row, .act-item { padding: 0.6rem 0.3rem; }
    .lb-avatar, .act-avatar { width: 1.85rem; height: 1.85rem; font-size: 0.65rem; }
    .lb-name, .act-text { font-size: 0.78rem; }
    .lb-points { font-size: 0.85rem; }

    .feature-card { padding: 1.25rem; }
    .feature-icon-box { width: 2.5rem; height: 2.5rem; margin-bottom: 1rem; }
    .feature-card h3 { font-size: 0.95rem; }
    .feature-card p { font-size: 0.78rem; }

    .dash-section, .counter-section, .dual-section,
    .features-section, .knowledge-section, .badge-section,
    .roadmap-section { padding: 2rem 0; }

    .cta-title { font-size: 1.4rem; }
    .cta-desc { font-size: 0.85rem; }
}

/* ============================================================
   HERO v5.0 - 浮动代码装饰
   ============================================================ */
.hero-badge-new {
    display: inline-block;
    background: linear-gradient(135deg, #f43f5e, #e11d48);
    color: #fff;
    font-size: 0.6rem;
    font-weight: 800;
    padding: 0.1rem 0.4rem;
    border-radius: 3px;
    letter-spacing: 0.03em;
    animation: pulse-ring 2s infinite;
}
.hero-cursor {
    display: inline-block;
    color: #0ea5e9;
    font-weight: 300;
    animation: cursorBlink 0.9s step-end infinite;
}
@keyframes cursorBlink {
    0%, 100% { opacity: 1; }
    50% { opacity: 0; }
}

/* 浮动代码块 */
.hero-code-float {
    position: absolute; z-index: 8; pointer-events: none;
    transition: opacity 0.3s ease, transform 0.3s ease;
}
.hero-code-left {
    left: max(3%, 10px); top: 18%;
    animation: floatSlow 7s ease-in-out infinite;
    animation-delay: 0s;
}
.hero-code-right {
    right: max(3%, 10px); top: 22%;
    animation: floatSlow 7.5s ease-in-out infinite;
    animation-delay: 1.5s;
}
@keyframes floatSlow {
    0%, 100% { transform: translateY(0) rotate(0deg); }
    33% { transform: translateY(-15px) rotate(1.5deg); }
    66% { transform: translateY(8px) rotate(-1deg); }
}

.hero-code-snippet {
    background: rgba(30,34,51,0.92);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    border: 1px solid rgba(255,255,255,0.08);
    border-radius: 0.9rem;
    overflow: hidden;
    box-shadow: 0 16px 48px rgba(15,23,42,0.15), 0 2px 8px rgba(15,23,42,0.08);
    min-width: 230px;
    max-width: 280px;
    transform: rotate(-2deg);
}
.hero-code-left .hero-code-snippet { transform: rotate(-3deg); }
.hero-code-right .hero-code-snippet { transform: rotate(3deg); }
.hero-code-bar {
    display: flex; align-items: center; gap: 6px;
    background: rgba(0,0,0,0.25);
    padding: 8px 12px;
}
.hcb-dot { width: 8px; height: 8px; border-radius: 50%; }
.hcb-red    { background: #ff5f57; }
.hcb-yellow { background: #febc2e; }
.hcb-green  { background: #28c840; }
.hcb-fname {
    color: rgba(255,255,255,0.35);
    font-size: 0.6rem; margin-left: auto;
    font-family: 'JetBrains Mono', monospace;
}
.hero-code-body {
    padding: 14px 16px;
    font-family: 'JetBrains Mono', 'Consolas', monospace;
    font-size: 0.7rem;
    line-height: 1.75;
    color: rgba(255,255,255,0.55);
}
.hc-kw { color: #c084fc; }
.hc-str { color: #86efac; }
.hc-type { color: #f9a8d4; }
.hc-fn { color: #60a5fa; }
.hc-num { color: #fde68a; }
.hc-cmt { color: #636d83; font-style: italic; }

/* ============================================================
   HOW IT WORKS v5.0 - 三步学习
   ============================================================ */
.how-section {
    padding: 3.5rem 0;
    background: linear-gradient(180deg, #f8fafc, #fff 50%, #f8fafc);
}
.how-grid {
    display: flex; align-items: flex-start; justify-content: center;
    gap: 0; max-width: 960px; margin: 0 auto;
}
.how-card {
    flex: 1; text-align: center; position: relative;
    padding: 1.5rem 1rem;
    transition: transform 0.4s cubic-bezier(0.34,1.56,0.64,1);
}
.how-card:hover { transform: translateY(-8px); }
.how-card-visual { margin-bottom: 1.25rem; }
.how-visual-box {
    position: relative; display: inline-flex; flex-direction: column;
    align-items: center; justify-content: center; gap: 0.5rem;
    min-height: 100px; /* 确保不同卡片视觉区高度一致 */
}
.how-icon-wrap {
    width: 4rem; height: 4rem; border-radius: 1.25rem;
    display: flex; align-items: center; justify-content: center;
    font-size: 1.4rem; position: relative; z-index: 1;
    box-shadow: 0 8px 24px rgba(0,0,0,0.06);
    transition: all 0.4s cubic-bezier(0.34,1.56,0.64,1);
}
.how-card:hover .how-icon-wrap {
    transform: scale(1.1);
    box-shadow: 0 12px 32px rgba(0,0,0,0.12);
}
/* 步骤数字水印 */
.how-card::before {
    content: attr(data-step);
    position: absolute; top: 0; left: 50%;
    transform: translateX(-50%);
    font-family: 'JetBrains Mono', monospace;
    font-size: 5rem; font-weight: 900;
    color: rgba(14,165,233,0.04);
    pointer-events: none; line-height: 1;
}
.how-card-body h3 {
    font-size: 1.15rem; font-weight: 800; color: #1e293b; margin-bottom: 0.5rem;
}
.how-card-body p {
    font-size: 0.85rem; color: #64748b; line-height: 1.65;
}

/* 打字动画 */
.how-typing-anim {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.9rem; color: #60a5fa;
    display: flex; align-items: center; gap: 0;
}
.hta-char {
    animation: typeChar 2s infinite;
    animation-delay: var(--d);
}
@keyframes typeChar {
    0%, 40% { opacity: 0; }
    50%, 100% { opacity: 1; }
}
.hta-cursor {
    color: #0ea5e9; font-weight: 300;
    animation: cursorBlink 0.8s step-end infinite;
}

/* 星星动画 */
.how-star-row {
    display: flex; gap: 0.4rem; font-size: 1.4rem;
}
.hstar {
    color: #f59e0b;
    animation: starPop 1.8s ease-in-out infinite;
    animation-delay: calc(var(--s) * 0.4s);
}
@keyframes starPop {
    0%, 100% { transform: scale(0.8); opacity: 0.4; }
    50% { transform: scale(1.25); opacity: 1; }
}

/* 连接器 */
.how-connector {
    display: flex; align-items: center; justify-content: center;
    flex-shrink: 0; align-self: stretch;
    padding-top: 2rem; /* 对齐到 icon 视觉区 */
}
.how-connector svg { width: 40px; height: 16px; }
/* 小圆点装饰 */
.how-dots {
    display: flex; gap: 4px; margin-top: 0.25rem;
}
.how-dot {
    width: 6px; height: 6px; border-radius: 50%;
    background: #0ea5e9;
    animation: dotBounce 1.4s ease-in-out infinite;
    animation-delay: calc(var(--i) * 0.2s);
}
@keyframes dotBounce {
    0%, 100% { transform: translateY(0); opacity: 0.4; }
    50% { transform: translateY(-4px); opacity: 1; }
}

/* ============================================================
   FEATURE CARDS v5.0 - 3D倾斜 + 光晕
   ============================================================ */
.feature-card[data-tilt] {
    transition: transform 0.15s ease-out, box-shadow 0.35s ease, border-color 0.35s ease;
    transform-style: preserve-3d;
    will-change: transform;
    isolation: isolate; /* 创建独立层叠上下文 */
}
.feature-card-glow {
    position: absolute; inset: 0; border-radius: inherit;
    pointer-events: none; opacity: 0;
    transition: opacity 0.3s ease;
    z-index: 0;
}
/* 确保伪元素在 glow 之下 */
.feature-card::before { z-index: -1; }
.feature-card > *:not(.feature-card-glow):not(style) {
    position: relative; z-index: 1;
}

/* ============================================================
   ROADMAP v5.0 - 连线 + 桥接
   ============================================================ */
.step-connector {
    display: flex; align-items: center; flex-shrink: 0;
    opacity: 0.6;
    transition: all 0.3s ease;
}
.step-connector:hover { opacity: 1; }
.step-connector svg {
    width: 22px; height: 12px;
}
.step-connector svg path { transition: stroke 0.3s ease; }
.step-connector:hover svg path { stroke: #94a3b8; }
.step-connector:hover svg polygon { fill: #94a3b8; }

/* 两阶段之间的桥接 */
.roadmap-bridge {
    display: flex; align-items: center; justify-content: center;
    padding: 0.25rem 0; gap: 1rem;
}
.roadmap-bridge-line {
    width: 60px; height: 2px;
    background: linear-gradient(90deg, transparent, #cbd5e1, transparent);
}
.roadmap-bridge-icon {
    width: 2.5rem; height: 2.5rem; border-radius: 50%;
    background: linear-gradient(135deg, #d1fae5, #ede9fe);
    color: #6366f1; display: flex; align-items: center; justify-content: center;
    font-size: 0.85rem; border: 2px solid #e2e8f0;
    animation: float 3s ease-in-out infinite;
    box-shadow: 0 4px 12px rgba(99,102,241,0.15);
}

/* ====== 响应式适配（新增部分） ====== */
@media (max-width: 1100px) {
    /* 中等屏幕缩小代码块 */
    .hero-code-snippet { min-width: 180px; max-width: 210px; }
    .hero-code-body { font-size: 0.6rem; padding: 10px 12px; }
    .hero-code-bar { padding: 6px 8px; }
    .hcb-dot { width: 6px; height: 6px; }
    .hcb-fname { font-size: 0.5rem; }
    .hero-code-left { left: 1.5%; top: 15%; }
    .hero-code-right { right: 1.5%; top: 18%; }
}

@media (max-width: 900px) {
    .hero-code-float { display: none; }
    .how-grid { flex-wrap: wrap; gap: 0.5rem; }
    .how-connector { display: none; }
    .how-card { flex: 1 1 45%; min-width: 200px; }
    .how-card::before { font-size: 3.5rem; }
}

@media (max-width: 768px) {
    .how-card { flex: 1 1 100%; }
    .hero-cursor { display: none; }
}

/* 触摸优化 */
@media (hover: none) and (pointer: coarse) {
    .cta-btn, .dash-action-btn, .kj-card, .lb-row, .act-item {
        min-height: 44px;
    }
    .cta-btn:active { transform: scale(0.95); }
    .how-card:hover { transform: none; }
    .feature-card[data-tilt]:hover { transform: none !important; }
}

/* ============================================================
   v5.1 升级 - 回到顶部、路面桥脉冲、分段过渡
   ============================================================ */

/* 回到顶部浮动按钮 */
.back-to-top-btn {
    position: fixed; bottom: 2rem; right: 2rem; z-index: 9999;
    width: 3rem; height: 3rem; border-radius: 0.9rem;
    border: 1px solid #e2e8f0;
    background: rgba(255,255,255,0.92);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    color: #64748b;
    cursor: pointer;
    display: flex; align-items: center; justify-content: center;
    box-shadow: 0 4px 16px rgba(15,23,42,0.08);
    transition: all 0.35s cubic-bezier(0.4,0,0.2,1);
    opacity: 0; visibility: hidden; transform: translateY(20px);
}
.back-to-top-btn.visible {
    opacity: 1; visibility: visible; transform: translateY(0);
}
.back-to-top-btn:hover {
    color: #0ea5e9; border-color: #bae6fd;
    box-shadow: 0 8px 28px rgba(14,165,233,0.18);
    transform: translateY(-4px);
}
.back-to-top-btn:active { transform: scale(0.92); }

/* 路面桥增强脉冲光晕 */
.roadmap-bridge-pulse {
    width: 8px; height: 8px; border-radius: 50%;
    background: #6366f1;
    animation: bridgePulse 2s ease-in-out infinite;
}
.roadmap-bridge-pulse:last-child { animation-delay: 1s; }
@keyframes bridgePulse {
    0%, 100% { transform: scale(0.6); opacity: 0.3; }
    50% { transform: scale(1.4); opacity: 1; }
}
.roadmap-bridge-line {
    width: 50px; height: 1.5px;
    background: linear-gradient(90deg, transparent, #cbd5e1, #94a3b8, #cbd5e1, transparent);
}
.roadmap-bridge-icon {
    width: 2.75rem; height: 2.75rem; border-radius: 50%;
    background: linear-gradient(135deg, #f0f9ff, #ede9fe);
    color: #6366f1;
    display: flex; align-items: center; justify-content: center;
    font-size: 0.85rem;
    border: 2px solid #e2e8f0;
    animation: bridgeFloat 3s ease-in-out infinite;
    box-shadow: 0 4px 16px rgba(99,102,241,0.15);
    transition: all 0.3s ease;
}
.roadmap-bridge-icon:hover {
    box-shadow: 0 8px 28px rgba(99,102,241,0.3);
    transform: scale(1.1);
}
@keyframes bridgeFloat {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-8px); }
}

/* 分段过渡装饰 */
.section-divider-top {
    position: absolute; top: 0; left: 0; right: 0;
    height: 4px;
    background: linear-gradient(90deg, transparent, rgba(14,165,233,0.3), rgba(139,92,246,0.3), transparent);
    opacity: 0.7;
}

/* Hero发光圆环增强 */
.hero-orb {
    transition: transform 0.3s ease;
}
.hero-section:hover .hero-orb-1 {
    transform: scale(1.05) translate(10px, -10px);
}
.hero-section:hover .hero-orb-2 {
    transform: scale(1.03) translate(-10px, 10px);
}
.hero-section:hover .hero-orb-3 {
    transform: scale(1.04) translate(5px, 15px);
}

/* 卡片统一微交互动画 */
.dash-card, .dual-panel, .roadmap-phase, .counter-item {
    transition: all 0.4s cubic-bezier(0.4,0,0.2,1);
}
.dash-card:hover, .dual-panel:hover, .roadmap-phase:hover {
    box-shadow: 0 16px 48px rgba(15,23,42,0.08);
    border-color: #cbd5e1;
}

/* 知识点卡片渐进增强 */
.kj-card::after {
    content: ''; position: absolute; left: 0; bottom: 0;
    width: 0; height: 3px;
    background: linear-gradient(90deg, #0ea5e9, #8b5cf6);
    transition: width 0.4s cubic-bezier(0.4,0,0.2,1);
}
.kj-card:hover::after { width: 100%; }
.kj-card-j::after { background: linear-gradient(90deg, #10b981, #0ea5e9); }
.kj-card-s::after { background: linear-gradient(90deg, #8b5cf6, #ec4899); }

/* 活动项左侧渐变指示线 */
.act-item {
    position: relative;
}
.act-item::before {
    content: ''; position: absolute; left: 0; top: 30%; bottom: 30%;
    width: 3px; border-radius: 3px;
    background: linear-gradient(180deg, #0ea5e9, #10b981);
    transform: scaleY(0);
    transition: transform 0.3s cubic-bezier(0.34,1.56,0.64,1);
}
.act-item:hover::before { transform: scaleY(1); }

/* 排行榜行序号标记动画 */
.lb-row {
    position: relative;
    overflow: hidden;
}
.lb-row::after {
    content: ''; position: absolute; inset: 0;
    background: linear-gradient(90deg, rgba(14,165,233,0.03), transparent);
    opacity: 0; transition: opacity 0.3s ease;
}
.lb-row:hover::after { opacity: 1; }

/* CTA 区域光斑呼吸 */
.cta-bg-orb {
    animation: orbBreath 6s ease-in-out infinite;
}
.cta-orb-2 { animation-delay: 3s; }
@keyframes orbBreath {
    0%, 100% { opacity: 0.3; transform: scale(1); }
    50% { opacity: 0.5; transform: scale(1.1); }
}

/* 数字跳动提示 */
.counter-item {
    overflow: hidden;
}
.counter-item::after {
    content: ''; position: absolute; bottom: 0; left: 20%; right: 20%;
    height: 2px; background: linear-gradient(90deg, transparent, #0ea5e9, transparent);
    transform: scaleX(0); transition: transform 0.5s cubic-bezier(0.34,1.56,0.64,1);
}
.counter-item:hover::after { transform: scaleX(1); }

/* Hero 状态标签微交互 */
.status-tag {
    transition: all 0.35s ease;
}
.status-tag:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.08);
}

/* 响应式补丁 - 回到顶部按钮 */
@media (max-width: 768px) {
    .back-to-top-btn {
        bottom: 1.25rem; right: 1.25rem;
        width: 2.5rem; height: 2.5rem; border-radius: 0.7rem;
    }
    .back-to-top-btn svg { width: 16px; height: 16px; }
    .roadmap-bridge-pulse { display: none; }
    .roadmap-bridge-line { width: 30px; }
}

@media (max-width: 480px) {
    .back-to-top-btn {
        bottom: 1rem; right: 1rem;
        width: 2.25rem; height: 2.25rem; border-radius: 0.6rem;
    }
}