/* ============================================================
 * 识讲粤语 · 00后黑底蓝黄撞色风
 * 字体：思源黑体 Noto Sans SC（900 weight 覆盖全部 CJK，含粤语字）
 * 配色：纯黑底 + 亮蓝 #0066FF + 亮黄 #FFD60A
 * ============================================================ */

/* ============ 基础重置 ============ */
* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'PingFang SC',
    'Microsoft YaHei', 'Hiragino Sans GB', sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
  font-weight: 400;
  transition: background 0.3s, color 0.3s;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

button, input, select, textarea {
  font-family: inherit;
  font-size: inherit;
  font-weight: inherit;
  border: none;
  outline: none;
  background: transparent;
  color: inherit;
}

a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
img { max-width: 100%; display: block; }

/* ============ 主题变量 ============ */
:root {
  --bg: #0a0a0a;
  --bg-soft: #1a1a1a;
  --bg-elev: #242424;
  --card: #1a1a1a;
  --card-text: #ffffff;
  --text: #ffffff;
  --text-soft: #999999;
  --blue: #0066ff;
  --yellow: #ffd60a;
  --pink: #ff3366;
  --green: #00d68f;
  --border: rgba(255, 255, 255, 0.12);
  --border-strong: rgba(255, 255, 255, 0.25);
  --shadow: 0 4px 16px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.6);
  --radius: 12px;
  --radius-lg: 20px;
  --font-display: 'Noto Sans SC', -apple-system, 'PingFang SC', 'Microsoft YaHei', sans-serif;
}

body.light {
  --bg: #f5f5f5;
  --bg-soft: #ffffff;
  --bg-elev: #fafafa;
  --card: #ffffff;
  --card-text: #0a0a0a;
  --text: #0a0a0a;
  --text-soft: #555555;
  --border: rgba(0, 0, 0, 0.12);
  --border-strong: rgba(0, 0, 0, 0.3);
  --shadow: 0 4px 16px rgba(0, 0, 0, 0.1);
}

/* ============ 排版 ============ */
.display {
  font-family: var(--font-display);
  font-weight: 900;
  letter-spacing: -0.02em;
  line-height: 1.15;
}
h1.display { font-size: clamp(36px, 8vw, 60px); }
h2.display { font-size: clamp(26px, 5vw, 38px); margin-bottom: 16px; }
h3.display { font-size: clamp(20px, 3vw, 24px); margin-bottom: 12px; }
.muted { color: var(--text-soft); }

/* 文字 + 图标 同行不换行 */
.inline-icon {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  white-space: nowrap;
  flex-wrap: nowrap;
}
.inline-icon i {
  font-size: 0.85em;
  line-height: 1;
  flex-shrink: 0;
}

/* ============ 布局 ============ */
.container { max-width: 720px; margin: 0 auto; padding: 24px 20px 80px; }
.container-wide { max-width: 960px; }
.section { padding: 40px 0; }
.stack > * + * { margin-top: 24px; }
.row { display: flex; gap: 12px; flex-wrap: wrap; align-items: center; }
.center { text-align: center; }

/* ============ 按钮 ============ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 28px;
  border-radius: 8px;
  font-weight: 900;
  font-size: 16px;
  cursor: pointer;
  transition: transform 0.15s, box-shadow 0.2s, background 0.2s, color 0.2s;
  border: 2px solid transparent;
  user-select: none;
  letter-spacing: 0.02em;
}
.btn:hover { transform: translate(-2px, -2px); }
.btn:active { transform: translate(0, 0); }

.btn-primary {
  background: var(--yellow);
  color: #0a0a0a;
  box-shadow: 4px 4px 0 #0066ff;
}
.btn-primary:hover { background: #ffe04a; box-shadow: 6px 6px 0 #0066ff; }

.btn-blue {
  background: var(--blue);
  color: #ffffff;
  box-shadow: 4px 4px 0 var(--yellow);
}
.btn-blue:hover { background: #1a78ff; box-shadow: 6px 6px 0 var(--yellow); }

.btn-ghost {
  background: transparent;
  color: var(--text);
  border: 2px solid var(--border-strong);
}
.btn-ghost:hover { background: var(--bg-soft); border-color: var(--text); }

.btn-block { width: 100%; }
.btn-lg { padding: 18px 32px; font-size: 17px; }

/* ============ 卡片 ============ */
.card {
  background: var(--card);
  color: var(--card-text);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
  transition: transform 0.2s, border-color 0.2s;
}
.card:hover { border-color: var(--border-strong); }
.card-flat {
  background: var(--bg-soft);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
}

/* ============ 徽章 ============ */
.badge {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 4px;
  font-size: 12px;
  font-weight: 900;
  background: var(--yellow);
  color: #0a0a0a;
  letter-spacing: 0.05em;
}
.badge-blue { background: var(--blue); color: #fff; }
.badge-yellow { background: var(--yellow); color: #0a0a0a; }
.badge-pink { background: var(--pink); color: #fff; }

/* ============ 表单 ============ */
.field { display: flex; flex-direction: column; gap: 8px; }
.field label { font-weight: 700; font-size: 14px; color: var(--text-soft); }
.input, .select {
  width: 100%;
  padding: 14px 16px;
  border-radius: 8px;
  background: var(--bg-soft);
  color: var(--text);
  border: 2px solid var(--border);
  font-size: 16px;
  font-weight: 700;
  transition: border-color 0.2s, background 0.2s;
}
.input:focus, .select:focus { border-color: var(--yellow); background: var(--bg-elev); }
.input::placeholder { color: var(--text-soft); font-weight: 400; }
.select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath fill='%23ffffff' d='M6 8L0 0h12z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 16px center;
  padding-right: 40px;
}
.checkbox {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  font-size: 13px;
  color: var(--text-soft);
  cursor: pointer;
}
.checkbox input { width: 18px; height: 18px; margin-top: 2px; flex-shrink: 0; accent-color: var(--yellow); }

/* ============ 题目卡 ============ */
.question-card {
  background: var(--card);
  color: var(--card-text);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--border);
  animation: slideUp 0.4s ease-out;
}
.question-num {
  display: inline-block;
  font-family: var(--font-display);
  font-weight: 900;
  color: var(--yellow);
  font-size: 13px;
  margin-bottom: 8px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}
.question-text {
  font-size: 22px;
  font-weight: 900;
  margin-bottom: 24px;
  line-height: 1.4;
}
.option {
  display: block;
  width: 100%;
  text-align: left;
  padding: 16px 20px;
  border-radius: 8px;
  background: var(--bg-soft);
  color: var(--text);
  border: 2px solid var(--border);
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 12px;
  cursor: pointer;
  transition: all 0.15s;
}
.option:hover { border-color: var(--yellow); background: var(--bg-elev); transform: translateX(4px); }
.option.correct { background: var(--yellow); color: #0a0a0a; border-color: var(--yellow); animation: pulse 0.4s; }
.option.wrong { background: var(--pink); color: #fff; border-color: var(--pink); animation: shake 0.4s; }

/* ============ 进度条 ============ */
.progress {
  width: 100%;
  height: 8px;
  background: var(--bg-soft);
  border-radius: 4px;
  overflow: hidden;
  margin-bottom: 24px;
  border: 1px solid var(--border);
}
.progress-fill {
  height: 100%;
  background: var(--yellow);
  border-radius: 4px;
  transition: width 0.4s ease-out;
}

/* ============ 标签气泡 ============ */
.tag {
  display: inline-block;
  padding: 6px 12px;
  border-radius: 4px;
  font-size: 13px;
  font-weight: 700;
  background: var(--bg-soft);
  color: var(--text);
  border: 1px solid var(--border);
  margin: 4px 4px 0 0;
}
.tag-yellow { background: var(--yellow); color: #0a0a0a; border-color: var(--yellow); }
.tag-blue { background: var(--blue); color: #fff; border-color: var(--blue); }

/* ============ 等级徽章 ============ */
.level-badge {
  display: inline-block;
  padding: 8px 20px;
  border-radius: 4px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 18px;
  background: var(--yellow);
  color: #0a0a0a;
  margin-bottom: 12px;
  letter-spacing: 0.05em;
}
.level-entry { background: var(--blue); color: #fff; }
.level-mid { background: var(--yellow); color: #0a0a0a; }
.level-high { background: var(--pink); color: #fff; }

/* ============ 推荐卡 ============ */
.partner-card, .course-card {
  background: var(--card);
  color: var(--card-text);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 12px;
  transition: transform 0.2s, border-color 0.2s;
}
.partner-card:hover, .course-card:hover { transform: translateY(-4px); border-color: var(--yellow); }
.partner-avatar, .course-emoji { font-size: 48px; line-height: 1; }
.partner-avatar {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  line-height: 1;
}
.partner-avatar-emoji {
  font-size: 44px;
  line-height: 1;
  display: inline-block;
  font-family: "Apple Color Emoji", "Segoe UI Emoji", "Noto Color Emoji", "Twemoji Mozilla", sans-serif;
}
.partner-name { font-size: 20px; font-weight: 900; }
.partner-meta, .course-meta { font-size: 13px; color: var(--text-soft); }
.partner-intro, .course-highlight { font-size: 14px; line-height: 1.5; }

.grid { display: grid; gap: 16px; grid-template-columns: 1fr; }
@media (min-width: 640px) {
  .grid-2 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(3, 1fr); }
}

/* ============ 顶部导航 ============ */
.topbar {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(10, 10, 10, 0.9);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 2px solid var(--yellow);
  padding: 14px 20px;
}
body.light .topbar { background: rgba(255, 255, 255, 0.9); }
.topbar-inner {
  max-width: 960px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.logo {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 900;
  letter-spacing: -0.02em;
}
.logo .pink { color: var(--yellow); }

/* ============ Hero ============ */
.hero { text-align: center; padding: 56px 0 24px; }
.hero-sub { font-size: 18px; color: var(--text-soft); margin: 16px 0 32px; font-weight: 700; }

/* ============ Footer ============ */
.footer {
  text-align: center;
  padding: 32px 16px;
  color: var(--text-soft);
  font-size: 13px;
  border-top: 1px solid var(--border);
  margin-top: 64px;
  font-weight: 700;
}

/* ============ 分享卡 ============ */
.share-card-wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  margin: 24px 0;
}
.share-card {
  width: 100%;
  max-width: 360px;
  aspect-ratio: 4 / 5;
  border-radius: var(--radius-lg);
  background: #0a0a0a;
  border: 4px solid var(--yellow);
  padding: 32px 24px;
  color: #fff;
  text-align: center;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  position: relative;
  overflow: hidden;
}
.share-emoji { font-size: 64px; margin-bottom: 8px; }
.share-title {
  font-family: var(--font-display);
  font-size: 56px;
  font-weight: 900;
  margin: 8px 0;
  color: var(--yellow);
  letter-spacing: 0.05em;
}
.share-tagline { font-size: 16px; color: var(--blue); margin-bottom: 12px; font-weight: 900; }
.share-level {
  display: inline-block;
  padding: 6px 16px;
  border-radius: 4px;
  background: var(--yellow);
  color: #0a0a0a;
  font-size: 14px;
  font-weight: 900;
  margin-bottom: 16px;
}
.share-desc { font-size: 14px; line-height: 1.6; color: var(--text); margin: 12px 0; }
.share-cta {
  font-size: 12px;
  color: var(--text-soft);
  border-top: 2px dashed var(--border);
  padding-top: 12px;
  margin-top: 12px;
  font-weight: 700;
}

/* ============ 动效 ============ */
@keyframes slideUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes shake {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-8px); }
  75% { transform: translateX(8px); }
}
@keyframes pulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.05); }
}
@keyframes confetti {
  0% { transform: translateY(0) rotate(0); opacity: 1; }
  100% { transform: translateY(400px) rotate(720deg); opacity: 0; }
}
.fade-in { animation: slideUp 0.5s ease-out; }

/* ============ 工具：内联 SVG 图标默认大小 ============ */
.ti {
  display: inline-block;
  width: 1em;
  height: 1em;
  vertical-align: -0.125em;
  flex-shrink: 0;
}
.ti-lg  { font-size: 1.4em; }
.ti-xl  { font-size: 2em; }
.ti-2xl { font-size: 3em; }
.ti-3xl { font-size: 4em; }

/* ============ 主题切换按钮 ============ */
.theme-toggle {
  position: fixed;
  bottom: 20px;
  right: 20px;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--yellow);
  color: #0a0a0a;
  box-shadow: var(--shadow);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  cursor: pointer;
  z-index: 100;
  border: 2px solid #0a0a0a;
  font-weight: 900;
}

/* ============ 顶导链接（细化）============ */
.topbar-link {
  padding: 8px 14px;
  border-radius: 999px;
  font-size: 14px;
  font-weight: 700;
  color: var(--text-soft);
  transition: background 0.25s cubic-bezier(0.4, 0, 0.2, 1), color 0.25s, transform 0.15s;
}
.topbar-link:hover {
  background: var(--bg-soft);
  color: var(--text);
  transform: translateY(-1px);
}
.topbar-link.is-active {
  background: var(--yellow);
  color: #0a0a0a;
}

/* ============ 滚动触发动画 ============ */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s cubic-bezier(0.16, 1, 0.3, 1), transform 0.7s cubic-bezier(0.16, 1, 0.3, 1);
  will-change: opacity, transform;
}
.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}
.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }
.reveal-delay-4 { transition-delay: 0.4s; }

/* ============ 自定义光标（桌面端）============ */
body { cursor: default; }
@media (pointer: fine) {
  body.has-custom-cursor,
  body.has-custom-cursor * { cursor: none !important; }
  body.has-custom-cursor a,
  body.has-custom-cursor button { cursor: none !important; }
  #custom-cursor {
    position: fixed;
    top: 0; left: 0;
    pointer-events: none;
    z-index: 99999;
    mix-blend-mode: difference;
  }
  .cursor-dot {
    position: fixed;
    width: 6px; height: 6px;
    background: var(--yellow);
    border-radius: 50%;
    pointer-events: none;
    transition: opacity 0.2s, transform 0.05s;
  }
  .cursor-ring {
    position: fixed;
    width: 32px; height: 32px;
    border: 2px solid var(--yellow);
    border-radius: 50%;
    pointer-events: none;
    transition: transform 0.18s cubic-bezier(0.16, 1, 0.3, 1), width 0.25s, height 0.25s, border-color 0.25s, background 0.25s;
  }
  #custom-cursor.is-hover .cursor-ring {
    width: 56px;
    height: 56px;
    background: rgba(0, 102, 255, 0.18);
    border-color: var(--blue);
  }
  #custom-cursor.is-hover .cursor-dot { opacity: 0; }
  #custom-cursor.is-hidden { opacity: 0; }
}

/* ============ 工具类 ============ */
.hide { display: none !important; }
.text-sm { font-size: 14px; }
.text-lg { font-size: 18px; }
.mt-1 { margin-top: 8px; }
.mt-2 { margin-top: 16px; }
.mt-3 { margin-top: 24px; }
.mt-4 { margin-top: 32px; }
.mb-1 { margin-bottom: 8px; }
.mb-2 { margin-bottom: 16px; }
.mb-3 { margin-bottom: 24px; }
.full { width: 100%; }
.bold { font-weight: 900; }

@media (max-width: 480px) {
  .container { padding: 16px 16px 80px; }
  .question-text { font-size: 18px; }
  .btn-lg { padding: 16px 24px; font-size: 16px; }
}