/* ========== 白色炫酷音乐风格（完整版） ========== */
:root {
  --bg: #f8faff;
  --surface: rgba(255, 255, 255, 0.85);
  --surface-solid: #ffffff;
  --text: #1a1a2e;
  --text-muted: #5a5a7a;
  --primary: #ff4d6d;
  --primary-light: #ff8a9e;
  --secondary: #4d9eff;
  --secondary-light: #8ac4ff;
  --accent: #f4d03f;
  --gradient-primary: linear-gradient(135deg, var(--primary), var(--secondary));
  --gradient-bg: linear-gradient(145deg, #f0f4ff, #ffffff);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.05);
  --shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.02);
  --shadow-lg: 0 20px 30px -12px rgba(0, 0, 0, 0.15);
  --border: rgba(0, 0, 0, 0.08);
  --radius: 1.5rem;
  --radius-sm: 1rem;
}

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

body {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  background: var(--gradient-bg);
  color: var(--text);
  line-height: 1.5;
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
}

a,
a:hover,
a:focus,
a:active {
  text-decoration: none;
}

/* 动态光晕背景 */
body::before {
  content: '';
  position: fixed;
  top: -20%;
  left: -20%;
  width: 140%;
  height: 140%;
  background: radial-gradient(circle at 20% 30%, rgba(255, 77, 109, 0.08), transparent 40%),
              radial-gradient(circle at 80% 70%, rgba(77, 158, 255, 0.08), transparent 40%);
  pointer-events: none;
  z-index: -1;
  animation: slowDrift 30s infinite alternate;
}

@keyframes slowDrift {
  0% { transform: translate(0, 0) scale(1); opacity: 0.5; }
  100% { transform: translate(3%, 2%) scale(1.05); opacity: 0.8; }
}

::-webkit-scrollbar {
  width: 8px;
}
::-webkit-scrollbar-track {
  background: #eef2ff;
}
::-webkit-scrollbar-thumb {
  background: var(--primary-light);
  border-radius: 10px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--primary);
}

.container {
  width: min(1300px, calc(100% - 3rem));
  margin: 0 auto;
}

/* 毛玻璃导航 */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(12px);
  background: rgba(255, 255, 255, 0.75);
  border-bottom: 1px solid rgba(0, 0, 0, 0.05);
  box-shadow: var(--shadow-sm);
}

.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.8rem 0;
  flex-wrap: wrap;
}

.logo {
  font-size: 1.8rem;
  font-weight: 800;
  background: var(--gradient-primary);
  background-clip: text;
  -webkit-background-clip: text;
  color: transparent;
  letter-spacing: -0.02em;
  transition: 0.2s;
}
.logo:hover {
  filter: brightness(1.05);
}

.main-nav {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.main-nav a,
.dropdown-toggle {
  display: inline-flex;
  align-items: center;
  padding: 0.5rem 1rem;
  border-radius: 2rem;
  font-weight: 500;
  color: var(--text-muted);
  transition: all 0.2s;
  line-height: 1.5;
  height: 40px;
}
.main-nav a:hover,
.dropdown-toggle:hover,
.main-nav a.active,
.dropdown-toggle.active {
  color: var(--primary);
  background: rgba(255, 77, 109, 0.1);
}

.dropdown {
  position: relative;
}
.dropdown-menu {
  display: none;
  position: absolute;
  top: 40px;
  left: 0;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(8px);
  border: 1px solid var(--border);
  border-radius: 1rem;
  min-width: 180px;
  padding: 0.5rem;
  box-shadow: var(--shadow);
  z-index: 100;
}
.dropdown:hover .dropdown-menu {
  display: block;
}
.dropdown-menu a {
  display: block;
  padding: 0.6rem 1rem;
  border-radius: 0.75rem;
}
.dropdown-menu a:hover {
  background: rgba(255, 77, 109, 0.1);
  color: var(--primary);
}

.nav-actions {
  display: flex;
  gap: 0.8rem;
}

/* 按钮 */
.btn,
.btn-outline,
.answer-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  text-align: center;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  background: var(--gradient-primary);
  border: none;
  color: white;
  font-weight: 600;
  padding: 0.6rem 1.4rem;
  border-radius: 2rem;
  cursor: pointer;
  transition: 0.3s;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}
.btn::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(120deg, transparent, rgba(255, 255, 255, 0.4), transparent);
  transform: translateX(-100%);
  transition: transform 0.6s;
}
.btn:hover::after {
  transform: translateX(100%);
}
.btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(255, 77, 109, 0.3);
}
.btn-outline {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text);
  box-shadow: none;
}
.btn-outline:hover {
  background: rgba(0, 0, 0, 0.02);
  border-color: var(--primary);
  color: var(--primary);
  transform: translateY(-2px);
  box-shadow: 0 8px 15px rgba(0, 0, 0, 0.05);
}
.btn-lg {
  padding: 0.8rem 1.8rem;
  font-size: 1rem;
}

/* 英雄区（用于首页启动屏的卡片，但会被 #startScreen 覆盖） */
.hero {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 70vh;
  padding: 2rem 0;
}
.hero-copy {
  background: var(--surface);
  backdrop-filter: blur(8px);
  border-radius: 2rem;
  padding: 3rem;
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
}
.tag {
  display: inline-block;
  background: rgba(255, 77, 109, 0.1);
  color: var(--primary);
  padding: 0.3rem 1rem;
  border-radius: 2rem;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 1px;
  margin-bottom: 1rem;
}
.hero-copy h1 {
  font-size: 3.5rem;
  font-weight: 800;
  line-height: 1.2;
  margin: 1rem 0;
  background: var(--gradient-primary);
  background-clip: text;
  -webkit-background-clip: text;
  color: transparent;
}
.hero-copy p {
  font-size: 1.1rem;
  color: var(--text-muted);
  margin-bottom: 2rem;
}
.hero-actions {
  display: flex;
  gap: 1rem;
  justify-content: center;
}

/* 五大训练模块卡片 */
.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  margin: 2rem 0;
}
.mode-card {
  position: relative;
  background: var(--surface-solid);
  border-radius: 2rem;
  padding: 2rem 1.5rem;
  text-align: center;
  transition: all 0.4s cubic-bezier(0.2, 0.9, 0.4, 1.1);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}
.mode-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(145deg, var(--card-accent, #ff4d6d), transparent);
  opacity: 0;
  transition: opacity 0.4s;
  z-index: -1;
}
.mode-card:hover::before {
  opacity: 0.05;
}
.mode-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
  border-color: var(--card-accent, var(--primary));
}
.mode-icon {
  font-size: 3.5rem;
  margin-bottom: 1rem;
  display: inline-block;
  transition: 0.3s;
}
.mode-card:hover .mode-icon {
  transform: scale(1.1);
}
.mode-card h3 {
  font-size: 1.6rem;
  font-weight: 700;
  margin: 0.5rem 0;
  background: linear-gradient(135deg, var(--text), var(--card-accent));
  background-clip: text;
  -webkit-background-clip: text;
  color: transparent;
}
.mode-card p {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin: 0.8rem 0 1.2rem;
}
.mode-card .btn-outline {
  border-color: var(--card-accent);
  color: var(--card-accent);
}
.mode-card .btn-outline:hover {
  background: var(--card-accent);
  color: white;
  border-color: var(--card-accent);
}

/* 五大模块专属色 */
.grid-3 .mode-card:nth-child(1) { --card-accent: #ff4d6d; }
.grid-3 .mode-card:nth-child(2) { --card-accent: #4d9eff; }
.grid-3 .mode-card:nth-child(3) { --card-accent: #f4d03f; }
.grid-3 .mode-card:nth-child(4) { --card-accent: #9b59b6; }
.grid-3 .mode-card:nth-child(5) { --card-accent: #1abc9c; }

/* 为什么选择我们 */
.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
}
.card {
  background: var(--surface-solid);
  border-radius: 1.5rem;
  padding: 1.5rem;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  transition: all 0.2s;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}
.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
}
.card h3 {
  font-size: 1.25rem;
  margin-bottom: 0.5rem;
}
.card p {
  font-size: 0.9rem;
  color: var(--text-muted);
}

/* 训练界面等其他原有样式（此处省略，但完整版已包含） */
/* 以下为简化，实际使用时需包含所有训练界面、统计、表单等样式，但为了代码简洁，此处省略。实际项目中请保留原有完整样式。 */
/* 由于你之前已有完整样式，我们在此只列出核心部分，你只需确保样式文件包含上述所有内容即可。 */

/* ========== 仅首页启动屏专用样式（不影响其他页面） ========== */
#startScreen {
    position: relative;
    width: 100%;
    min-height: calc(100vh - 72px);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: clamp(1rem, 3vw, 2.5rem);
    overflow: hidden;
    isolation: isolate;
    background-image: url('../images/hero-bg.jpg');
    background-position: center center;
    background-repeat: no-repeat;
    background-size: 100% 100%;
}

#startScreen::before {
    content: '';
    position: absolute;
    inset: 0;
    z-index: 0;
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.22), rgba(255, 255, 255, 0.34));
}

#startScreen .hero-overlay {
    position: absolute;
    inset: 0;
    z-index: 1;
    pointer-events: none;
    background: rgba(255, 255, 255, 0.42);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

#startScreen .hero-copy {
    position: relative;
    z-index: 2;
    text-align: center;
    max-width: 860px;
    width: min(100%, 860px);
    margin: 0 auto;
    padding: clamp(1.5rem, 4vw, 3rem);
    border-radius: 2rem;
    background: rgba(255, 255, 255, 0.32);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid rgba(255, 255, 255, 0.62);
    box-shadow: 0 16px 40px rgba(100, 118, 150, 0.16);
    color: #20304a;
    text-shadow: none;
}

#startScreen .hero-actions {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.8rem;
}

#startScreen .guest-hint {
    font-size: 0.9rem;
    color: rgba(32, 48, 74, 0.84);
}

#startScreen .tag {
    background: rgba(255, 255, 255, 0.62);
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
    color: #30415f;
    border: 1px solid rgba(255, 255, 255, 0.78);
}

#startScreen .hero-copy h1 {
    background: linear-gradient(135deg, #22324d, #586b8d);
    background-clip: text;
    -webkit-background-clip: text;
    color: transparent;
    text-shadow: none;
}

#startScreen .hero-copy p {
    color: #34455f;
    text-shadow: none;
    font-weight: 500;
}

#startScreen .btn {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border: none;
    color: #fff;
    font-weight: 600;
    padding: 0.8rem 1.8rem;
    min-width: 220px;
    box-shadow: 0 8px 20px rgba(77, 108, 160, 0.22);
}

#startScreen .btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 26px rgba(77, 108, 160, 0.28);
}

#startScreen .btn-outline {
    background: rgba(255, 255, 255, 0.72);
    border: 1px solid rgba(48, 65, 95, 0.18);
    color: #30415f;
}

#startScreen .btn-outline:hover {
    background: rgba(255, 255, 255, 0.9);
    border-color: rgba(48, 65, 95, 0.28);
    color: #22324d;
}

#startScreen .guest-hint a {
    color: #22324d;
    text-decoration: none;
    border-bottom: none;
}

#startScreen .guest-hint a:hover {
    color: var(--primary);
    border-bottom: none;
}

.home-page-content {
    padding-top: 2rem;
}

@media (max-width: 768px) {
    #startScreen {
        min-height: calc(100vh - 64px);
        padding: 1rem;
        background-position: center top;
    }

    #startScreen .hero-copy {
        padding: 1.25rem;
        border-radius: 1.5rem;
    }
}
/* ========== 训练页重构样式 ========== */
.section {
  padding: 2rem 0 3rem;
}

.training-page-section {
  display: grid;
  gap: 1.5rem;
}

.training-hero {
  position: relative;
  overflow: hidden;
  padding: 2rem;
  background: linear-gradient(135deg, rgba(255,255,255,0.95), rgba(246,249,255,0.92));
}

.training-hero::after {
  content: '';
  position: absolute;
  inset: auto -8% -32% auto;
  width: 300px;
  height: 300px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(77,158,255,0.18), transparent 65%);
  pointer-events: none;
}

.training-hero-main {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  position: relative;
  z-index: 1;
}

.mode-icon.large {
  width: 84px;
  height: 84px;
  border-radius: 24px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: rgba(255,255,255,0.9);
  box-shadow: var(--shadow);
  font-size: 2.6rem;
  flex: 0 0 auto;
}

.training-hero h1 {
  margin: 0.2rem 0 0.5rem;
  font-size: clamp(1.8rem, 3vw, 2.6rem);
}

.training-hero-points {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.25rem;
  position: relative;
  z-index: 1;
}

.training-hero-points span,
.setup-badge,
.mini-tag,
.status-pill {
  border: 1px solid rgba(99, 102, 241, 0.12);
  background: rgba(255,255,255,0.78);
  backdrop-filter: blur(8px);
}

.training-hero-points span,
.setup-badge,
.mini-tag {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  padding: 0.45rem 0.9rem;
  color: var(--text-muted);
  font-size: 0.88rem;
  font-weight: 600;
}

.training-layout {
  display: grid;
  grid-template-columns: minmax(320px, 0.9fr) minmax(0, 1.45fr);
  gap: 1.5rem;
  align-items: start;
}

.training-setup-card,
.training-stage-card {
  padding: 1.5rem;
}

.training-setup-card {
  position: sticky;
  top: 94px;
}

.section-head.compact {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1rem;
}

.section-head.compact h2 {
  font-size: 1.35rem;
  margin-top: 0.15rem;
}

.eyebrow {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--primary);
  font-weight: 700;
}

.setup-badge {
  color: var(--primary);
}

.training-config {
  display: grid;
  gap: 1rem;
}

.config-live-overview {
  margin-bottom: 1rem;
  padding: 1rem;
  border-radius: 1.15rem;
  border: 1px solid rgba(255, 77, 109, 0.14);
  background: linear-gradient(145deg, rgba(255,255,255,0.98), rgba(255,244,247,0.9));
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.7);
}

.config-live-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.8rem;
  margin-bottom: 0.75rem;
  flex-wrap: wrap;
}

.config-live-head strong {
  font-size: 0.98rem;
}

.live-indicator {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.35rem 0.8rem;
  border-radius: 999px;
  background: rgba(255, 77, 109, 0.1);
  color: var(--primary);
  font-size: 0.8rem;
  font-weight: 700;
}

.config-live-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.range-chip {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.55rem 0.85rem;
  border-radius: 999px;
  background: rgba(255,255,255,0.92);
  border: 1px solid rgba(15, 23, 42, 0.08);
  color: var(--text);
  font-size: 0.86rem;
  font-weight: 600;
  text-align: center;
}

.range-chip-title {
  background: linear-gradient(135deg, rgba(255, 77, 109, 0.12), rgba(77, 158, 255, 0.1));
  border-color: rgba(255, 77, 109, 0.16);
  color: var(--primary);
}

.range-chip-empty {
  color: var(--text-muted);
}

.config-error-text {
  color: #b91c1c;
  font-weight: 700;
}

.config-section {
  border: 1px solid rgba(15, 23, 42, 0.07);
  border-radius: 1.2rem;
  padding: 1rem;
  background: linear-gradient(180deg, rgba(255,255,255,0.96), rgba(248,250,255,0.88));
}

.config-section h3 {
  margin-bottom: 0.35rem;
  font-size: 1.04rem;
}

.small {
  font-size: 0.84rem;
}

.config-control + .config-control {
  margin-top: 0.95rem;
}

.config-label {
  display: block;
  font-size: 0.9rem;
  font-weight: 700;
  margin-bottom: 0.55rem;
}

.config-select {
  width: 100%;
  min-height: 48px;
  border-radius: 0.95rem;
  border: 1px solid rgba(15, 23, 42, 0.08);
  background: white;
  color: var(--text);
  padding: 0.85rem 1rem;
  font: inherit;
  outline: none;
  appearance: none;
}

.choice-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
}

.choice-grid-compact .choice-chip {
  flex: 1 1 calc(50% - 0.7rem);
}

.choice-chip {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  padding: 0.75rem 0.95rem;
  border-radius: 1rem;
  background: rgba(255,255,255,0.86);
  border: 1px solid rgba(15, 23, 42, 0.08);
  color: var(--text);
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
}

.choice-chip:hover {
  transform: translateY(-1px);
  border-color: rgba(255, 77, 109, 0.32);
  box-shadow: 0 10px 18px rgba(15, 23, 42, 0.06);
}

.choice-chip input {
  accent-color: var(--primary);
}

.toggle-switch {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  border-radius: 999px;
  border: 1px solid rgba(15,23,42,0.08);
  background: rgba(255,255,255,0.95);
  padding: 0.5rem 0.75rem 0.5rem 0.55rem;
  cursor: pointer;
  transition: 0.2s ease;
}

.toggle-switch.is-on {
  border-color: rgba(255, 77, 109, 0.22);
  box-shadow: 0 12px 20px rgba(255, 77, 109, 0.12);
}

.toggle-knob {
  width: 36px;
  height: 22px;
  border-radius: 999px;
  background: linear-gradient(135deg, #cbd5e1, #94a3b8);
  position: relative;
  display: inline-block;
}

.toggle-knob::after {
  content: '';
  position: absolute;
  top: 3px;
  left: 3px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: white;
  transition: 0.2s ease;
  box-shadow: 0 2px 6px rgba(15, 23, 42, 0.15);
}

.toggle-switch.is-on .toggle-knob {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
}

.toggle-switch.is-on .toggle-knob::after {
  transform: translateX(14px);
}

.toggle-text {
  font-weight: 700;
  color: var(--text);
}

.stage-screen {
  display: grid;
  gap: 1rem;
}

.config-summary {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.9rem;
}

.summary-card {
  padding: 1rem;
  border-radius: 1.1rem;
  background: linear-gradient(180deg, rgba(248,250,255,1), rgba(255,255,255,0.92));
  border: 1px solid rgba(15,23,42,0.07);
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.7);
  text-align: center;
}

.summary-card strong {
  display: block;
  font-size: 1.05rem;
}

.summary-label {
  display: block;
  font-size: 0.82rem;
  margin-bottom: 0.35rem;
  color: var(--text-muted);
}

.start-actions,
.result-actions,
.play-panel-advanced {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
}

.training-topbar {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.8rem;
}

.status-pill {
  padding: 0.95rem 1rem;
  border-radius: 1.15rem;
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  min-height: 82px;
  justify-content: center;
}

.status-pill span {
  color: var(--text-muted);
  font-size: 0.82rem;
}

.status-pill strong {
  font-size: 1.12rem;
}

.status-pill-primary {
  background: linear-gradient(135deg, rgba(255, 77, 109, 0.12), rgba(77, 158, 255, 0.08));
  border-color: rgba(255, 77, 109, 0.18);
}

.training-progress {
  height: 12px;
  border-radius: 999px;
  background: rgba(203,213,225,0.35);
  overflow: hidden;
}

.bar span {
  display: block;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
}

.question-card {
  border-radius: 1.4rem;
  padding: 1.25rem;
  border: 1px solid rgba(15,23,42,0.07);
  background: linear-gradient(145deg, rgba(255,255,255,0.96), rgba(246,249,255,0.9));
  text-align: center;
}

.question-card h3 {
  margin: 0.2rem 0 0.45rem;
  font-size: clamp(1.25rem, 2vw, 1.65rem);
}

.active-config-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-top: 0.95rem;
}

.mini-tag {
  color: var(--secondary);
}

.answer-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.85rem;
}

.answer-grid-large {
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
}

.answer-btn {
  appearance: none;
  border: 1px solid rgba(15,23,42,0.08);
  background: rgba(255,255,255,0.92);
  color: var(--text);
  min-height: 66px;
  border-radius: 1rem;
  padding: 0.95rem 1rem;
  font: inherit;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.2s ease;
  box-shadow: 0 10px 18px rgba(15, 23, 42, 0.04);
}

.answer-btn:hover {
  transform: translateY(-2px);
  border-color: rgba(255, 77, 109, 0.22);
  box-shadow: 0 16px 24px rgba(15, 23, 42, 0.08);
}

.answer-btn.correct {
  background: linear-gradient(135deg, rgba(5,150,105,0.16), rgba(16,185,129,0.08));
  border-color: rgba(5,150,105,0.28);
  color: #047857;
}

.answer-btn.wrong {
  background: linear-gradient(135deg, rgba(239,68,68,0.12), rgba(248,113,113,0.08));
  border-color: rgba(239,68,68,0.26);
  color: #b91c1c;
}

.feedback {
  border-radius: 1rem;
  padding: 1rem 1.1rem;
  font-weight: 700;
}

.feedback.success {
  background: rgba(16,185,129,0.1);
  color: #047857;
  border: 1px solid rgba(16,185,129,0.2);
}

.feedback.error {
  background: rgba(239,68,68,0.1);
  color: #b91c1c;
  border: 1px solid rgba(239,68,68,0.2);
}

.feedback strong,
.feedback span {
  display: block;
}

.feedback span {
  margin-top: 0.35rem;
  font-weight: 600;
}

.answer-btn:disabled,
.btn:disabled,
.btn-outline:disabled {
  cursor: not-allowed;
  opacity: 0.68;
  transform: none !important;
  box-shadow: none !important;
}

.answer-review-bar,
.notation-card {
  border-radius: 1.25rem;
  border: 1px solid rgba(15,23,42,0.07);
  background: linear-gradient(145deg, rgba(255,255,255,0.97), rgba(245,248,255,0.92));
  padding: 1.15rem;
}

.answer-review-bar {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 1rem;
  align-items: center;
}

.review-actions,
.notation-card-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.85rem;
  flex-wrap: wrap;
}

.notation-card-head h3,
.answer-review-bar h3 {
  margin: 0.2rem 0 0.25rem;
  font-size: 1.08rem;
}

.notation-renderer {
  margin-top: 1rem;
  overflow-x: auto;
  border-radius: 1rem;
  background: linear-gradient(180deg, rgba(255,255,255,0.98), rgba(248,250,255,0.96));
  border: 1px solid rgba(148,163,184,0.18);
  padding: 0.8rem;
  min-height: 120px;
}

.notation-renderer .osmd-sheet-container,
.notation-renderer .osmd-sheet-container svg {
  max-width: none;
}

.notation-renderer .osmd-sheet-container svg {
  display: block;
  height: auto;
}

.notation-svg {
  display: block;
  width: max(100%, 620px);
  height: auto;
}

.musicxml-source {
  margin-top: 0.9rem;
  padding: 0.9rem 1rem;
  max-height: 280px;
  overflow: auto;
  border-radius: 1rem;
  background: #0f172a;
  color: #e2e8f0;
  font-size: 0.8rem;
  line-height: 1.6;
  white-space: pre-wrap;
  word-break: break-word;
}

.notation-fallback {
  padding: 1rem;
  border-radius: 0.9rem;
  background: rgba(248,113,113,0.12);
  color: #b91c1c;
  font-weight: 700;
}

.btn-sm {
  padding: 0.55rem 1rem;
  font-size: 0.9rem;
}

.hidden {
  display: none !important;
}

.result-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.85rem;
}

.result-box {
  padding: 1rem;
  border-radius: 1.1rem;
  border: 1px solid rgba(15,23,42,0.07);
  background: linear-gradient(145deg, rgba(255,255,255,0.95), rgba(246,249,255,0.92));
}

.result-box strong {
  display: block;
  font-size: 1.4rem;
  margin-bottom: 0.3rem;
}

.result-box span {
  color: var(--text-muted);
  font-size: 0.88rem;
}

@media (max-width: 980px) {
  .nav-wrap {
    justify-content: center;
  }

  .logo,
  .main-nav,
  .nav-actions {
    width: 100%;
  }

  .logo {
    text-align: center;
  }

  .main-nav,
  .nav-actions {
    justify-content: center;
  }

  .dropdown-menu {
    left: 50%;
    transform: translateX(-50%);
  }
}

@media (max-width: 1080px) {
  .training-layout {
    grid-template-columns: 1fr;
  }

  .training-setup-card {
    order: 2;
    position: static;
  }

  .training-stage-card {
    order: 1;
  }
}

@media (max-width: 820px) {
  .container {
    width: min(100%, calc(100% - 1.4rem));
  }

  .main-nav {
    gap: 0.6rem;
  }

  .main-nav a,
  .dropdown {
    flex: 1 1 calc(50% - 0.6rem);
  }

  .dropdown-toggle {
    width: 100%;
    justify-content: center;
  }

  .nav-actions {
    flex-wrap: wrap;
  }

  .nav-actions .btn,
  .nav-actions .btn-outline {
    flex: 1 1 calc(50% - 0.4rem);
  }

  .training-hero-main {
    align-items: flex-start;
  }

  .training-topbar {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .config-summary,
  .result-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .choice-grid-compact .choice-chip,
  .answer-grid {
    grid-column: auto;
  }

  .choice-chip {
    flex: 1 1 calc(50% - 0.7rem);
  }
}

@media (max-width: 560px) {
  .section {
    padding: 1.1rem 0 2rem;
  }

  .nav-wrap {
    gap: 0.85rem;
  }

  .logo {
    font-size: 1.5rem;
  }

  .main-nav a,
  .dropdown,
  .nav-actions .btn,
  .nav-actions .btn-outline {
    flex: 1 1 100%;
  }

  .dropdown-menu {
    position: static;
    transform: none;
    margin-top: 0.4rem;
    min-width: 100%;
  }

  .card,
  .training-hero,
  .training-setup-card,
  .training-stage-card {
    padding: 1rem;
  }

  .training-hero-main {
    align-items: flex-start;
    flex-direction: column;
  }

  .training-hero-points,
  .config-live-badges,
  .active-config-tags {
    justify-content: center;
  }

  .mode-icon.large {
    width: 68px;
    height: 68px;
    font-size: 2rem;
    border-radius: 18px;
  }

  .section-head.compact,
  .config-live-head {
    flex-direction: column;
  }

  .config-summary,
  .training-topbar,
  .result-grid,
  .answer-grid,
  .answer-grid-large {
    grid-template-columns: 1fr;
  }

  .summary-card strong {
    font-size: 1rem;
    line-height: 1.45;
    word-break: break-word;
  }

  .choice-chip,
  .range-chip {
    flex: 1 1 100%;
    width: 100%;
  }

  .status-pill {
    min-height: auto;
  }

  .btn,
  .btn-outline,
  .btn-lg {
    width: 100%;
    justify-content: center;
  }

  .start-actions,
  .result-actions,
  .play-panel-advanced,
  .review-actions {
    flex-direction: column;
  }

  .answer-review-bar {
    grid-template-columns: 1fr;
  }

  .notation-card-head {
    align-items: flex-start;
  }
}


/* ========== 布局补强与移动端优化 ========== */
.page-main {
  padding-bottom: 2rem;
}

.site-footer {
  padding: 1.25rem 0 2rem;
}

.footer-wrap {
  display: flex;
  justify-content: center;
}

.grid {
  display: grid;
  gap: 1.5rem;
}

.grid-2 {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.guest-hint-highlight {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  padding: 0.7rem 1rem;
  border-radius: 999px;
  background: linear-gradient(135deg, rgba(255, 77, 109, 0.14), rgba(244, 208, 63, 0.2));
  border: 1px solid rgba(255, 77, 109, 0.18);
  box-shadow: 0 10px 20px rgba(255, 77, 109, 0.1);
}

.guest-entry-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 40px;
  padding: 0.15rem 0.2rem;
  color: var(--primary) !important;
  font-weight: 800;
  letter-spacing: 0.01em;
  position: relative;
}

.guest-entry-link::after {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  border-radius: 999px;
  background: currentColor;
  opacity: 0.75;
}

.scroll-cue {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  margin-top: 1.15rem;
  color: #30415f;
  font-weight: 700;
}

.scroll-cue::after {
  content: '↓';
  animation: bounceDown 1.4s ease-in-out infinite;
}

@keyframes bounceDown {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(5px); }
}

.dropdown.is-open .dropdown-menu {
  display: block;
}

.table-wrap {
  width: 100%;
  overflow-x: auto;
}

.table {
  width: 100%;
  border-collapse: collapse;
  min-width: 640px;
}

.table th,
.table td {
  padding: 0.9rem 0.95rem;
  text-align: left;
  border-bottom: 1px solid rgba(15, 23, 42, 0.08);
  white-space: nowrap;
}

.table th {
  color: var(--text-muted);
  font-size: 0.84rem;
  font-weight: 700;
}

.type-stat-list {
  display: grid;
  gap: 1rem;
}

.type-stat-item {
  display: grid;
  gap: 0.65rem;
}

.type-stat-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.stat-box strong,
.result-box strong {
  display: block;
}

.profile-card {
  text-align: center;
}

.avatar-xl {
  width: 88px;
  height: 88px;
  margin: 0 auto 1rem;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  font-weight: 800;
  color: #fff;
  background: var(--gradient-primary);
  box-shadow: var(--shadow);
}

.stats-row {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.85rem;
  margin-top: 1.25rem;
}

.stats-row > div {
  padding: 1rem 0.85rem;
  border-radius: 1rem;
  background: linear-gradient(145deg, rgba(255,255,255,0.96), rgba(246,249,255,0.92));
  border: 1px solid rgba(15,23,42,0.07);
}

.stats-row strong,
.stats-row span {
  display: block;
}

.stats-row span {
  margin-top: 0.35rem;
  color: var(--text-muted);
  font-size: 0.84rem;
}

form.card label {
  display: block;
  font-weight: 700;
  margin-top: 1rem;
}

form.card input,
form.card select,
form.card textarea {
  width: 100%;
  margin-top: 0.45rem;
  padding: 0.85rem 1rem;
  border-radius: 1rem;
  border: 1px solid rgba(15,23,42,0.08);
  background: rgba(255,255,255,0.96);
  font: inherit;
}

form.card input:disabled {
  background: rgba(241,245,249,0.85);
  color: #64748b;
}

.charts-grid canvas {
  display: block;
  width: 100%;
  max-width: 100%;
}

@media (max-width: 980px) {
  .grid-4,
  .stat-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .grid-3 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .charts-grid,
  .grid-2 {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 820px) {
  .dropdown-menu {
    min-width: min(100%, 320px);
  }

  .home-page-content {
    padding-top: 1.2rem;
  }

  .mode-card {
    align-items: flex-start;
    text-align: left;
  }

  .mode-card .btn-outline {
    width: 100%;
  }
}

@media (max-width: 768px) {
  .grid-3,
  .grid-4,
  .stats-row {
    grid-template-columns: 1fr;
  }

  #startScreen .hero-copy h1 {
    font-size: 2.3rem;
    line-height: 1.18;
  }

  #startScreen .hero-copy p {
    font-size: 1rem;
  }
}

@media (max-width: 560px) {
  .guest-hint-highlight {
    width: 100%;
    flex-wrap: wrap;
    text-align: center;
    border-radius: 1.2rem;
  }

  .scroll-cue {
    width: 100%;
  }

  .type-stat-head {
    flex-direction: column;
    align-items: flex-start;
  }

  .table {
    min-width: 560px;
  }
}


.muted {
  color: var(--text-muted);
}

.alert {
  padding: 0.9rem 1rem;
  border-radius: 1rem;
  margin-bottom: 1rem;
  border: 1px solid transparent;
}

.alert-success {
  background: rgba(16, 185, 129, 0.1);
  color: #047857;
  border-color: rgba(16, 185, 129, 0.22);
}

.alert-error {
  background: rgba(239, 68, 68, 0.1);
  color: #b91c1c;
  border-color: rgba(239, 68, 68, 0.22);
}

.user-chip {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  min-height: 40px;
  padding: 0.5rem 0.95rem;
  border-radius: 999px;
  background: rgba(255,255,255,0.92);
  border: 1px solid rgba(15,23,42,0.08);
  color: var(--text);
  font-weight: 700;
  box-shadow: var(--shadow-sm);
}

.stat-grid .card,
.charts-grid .card {
  align-items: stretch;
  text-align: left;
}