/* ============================================================
   天天点读 · 官方网页 样式
   设计基调：清爽蓝白 + 深蓝导航
   ============================================================ */

:root {
  /* 品牌色 */
  --navy: #16345f;          /* 导航深蓝 */
  --navy-2: #0f2747;
  --ink: #0f2747;           /* 标题文字 */
  --body: #43546d;          /* 正文 */
  --blue: #2f7cf0;
  --blue-deep: #1c5fd6;
  --sky: #eaf2fc;           /* 浅蓝背景 */
  --grey: #f4f7fa;          /* 浅灰背景 */
  --teal: #2ebca4;
  --green: #46b96b;

  /* 导航按钮色 */
  --pill-blue: #4098ff;
  --pill-teal: #2ebca4;
  --pill-green: #4fb96f;
  --nav-active-bar: #ffcf3f;  /* 导航选中底部横条颜色（可自定义） */

  --card: #ffffff;
  --line: #e3ecf7;
  --radius: 20px;
  --radius-lg: 28px;
  --shadow: 0 24px 50px -24px rgba(16, 44, 86, 0.28);
  --shadow-sm: 0 14px 30px -18px rgba(16, 44, 86, 0.22);
}

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

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  color: var(--body);
  background: #fff;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

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

.container {
  width: 100%;
  max-width: 1160px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------------- 顶部导航 ---------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: linear-gradient(120deg, var(--navy-2) 0%, var(--navy) 55%, #1e4b8f 100%);
  box-shadow: 0 6px 24px -12px rgba(9, 26, 54, 0.55);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 86px;
  gap: 20px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  color: #fff;
  font-size: 30px;
  font-weight: 800;
  letter-spacing: 1px;
  white-space: nowrap;
}

.brand-mark {
  width: 46px;
  height: 46px;
  flex: 0 0 auto;
  display: block;
  border-radius: 13px;
  object-fit: cover;
  box-shadow: 0 8px 16px -8px rgba(10, 40, 90, 0.65);
}

.brand small { display: none; }

.main-nav { display: flex; gap: 20px; align-items: center; }

/* 彩色胶囊导航 */
.nav-pill {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 13px 34px;
  border-radius: 999px;
  color: #4a4a4a;
  font-size: 16.5px;
  font-weight: 700;
  letter-spacing: 0.5px;
  box-shadow: 0 6px 14px -8px rgba(0, 0, 0, 0.4);
  transition: transform 0.18s ease, filter 0.18s ease, box-shadow 0.18s ease;
}

.nav-pill:hover {
  transform: translateY(-2px);
  filter: brightness(1.08);
}

.pill-blue  { background: linear-gradient(135deg, #62acff, var(--pill-blue)); }
.pill-teal  { background: linear-gradient(135deg, #4fd0b7, var(--pill-teal)); }
.pill-green { background: linear-gradient(135deg, #63cc80, var(--pill-green)); }

/* 选中态：底部加一条小横条标注 */
.nav-pill.active::after {
  content: "";
  position: absolute;
  left: 22%;
  right: 22%;
  bottom: -12px;
  height: 4px;
  border-radius: 999px;
  background: var(--nav-active-bar);
  box-shadow: 0 2px 8px rgba(255, 205, 60, 0.55);
}

.nav-pill .dot {
  width: 7px; height: 7px;
  border-radius: 50%;
  background: #fff;
  opacity: 0.85;
}

/* 移动端开关 */
.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  border: 0;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.12);
  cursor: pointer;
  position: relative;
}
.nav-toggle span,
.nav-toggle span::before,
.nav-toggle span::after {
  content: "";
  position: absolute;
  left: 11px;
  width: 22px;
  height: 2px;
  border-radius: 2px;
  background: #fff;
  transition: 0.25s;
}
.nav-toggle span { top: 21px; }
.nav-toggle span::before { top: -7px; }
.nav-toggle span::after { top: 7px; }
.nav-toggle.open span { background: transparent; }
.nav-toggle.open span::before { top: 0; transform: rotate(45deg); }
.nav-toggle.open span::after { top: 0; transform: rotate(-45deg); }

/* ---------------- 首页 Hero ---------------- */
.hero {
  position: relative;
  background:
    radial-gradient(900px 520px at 88% -10%, rgba(86, 166, 255, 0.35), transparent 60%),
    radial-gradient(700px 500px at -8% 108%, rgba(70, 205, 180, 0.25), transparent 55%),
    linear-gradient(180deg, #ddecfb 0%, #eef6ff 55%, #f2f7ff 100%);
  overflow: hidden;
}

.hero-inner {
  position: relative;
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  align-items: center;
  gap: 30px;
  min-height: 620px;
  padding: 70px 24px 96px;
}

/* 漂浮装饰 */
.hero-inner::before,
.hero-inner::after {
  content: "";
  position: absolute;
  border-radius: 50%;
  filter: blur(2px);
  opacity: 0.5;
  z-index: 0;
}
.hero-inner::before {
  width: 260px; height: 260px;
  top: 40px; right: -70px;
  background: radial-gradient(circle at 30% 30%, #bfe0ff, transparent 70%);
}
.hero-inner::after {
  width: 220px; height: 220px;
  bottom: 20px; left: 34%;
  background: radial-gradient(circle at 40% 40%, #c6f2e6, transparent 70%);
}

.hero-copy, .hero-visual { position: relative; z-index: 1; }

/* 在线胶囊 */
.live-pill {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 8px 18px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.85);
  border: 1px solid rgba(56, 130, 246, 0.2);
  color: #1a4c94;
  font-size: 14px;
  font-weight: 600;
  box-shadow: 0 10px 22px -14px rgba(30, 90, 170, 0.5);
  backdrop-filter: blur(6px);
}
.live-dots { display: inline-flex; gap: 5px; align-items: center; }
.live-dots i {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: #53c98a;
  box-shadow: 0 0 0 0 rgba(83, 201, 138, 0.5);
  animation: ping 1.6s ease-out infinite;
}
.live-dots i:nth-child(2) { animation-delay: 0.25s; background: #41b6ff; box-shadow: 0 0 0 0 rgba(65, 182, 255, 0.5); }
.live-dots i:nth-child(3) { animation-delay: 0.5s;  background: #f2b64d; box-shadow: 0 0 0 0 rgba(242, 182, 77, 0.5); }
.live-dots i:nth-child(2) { animation-name: ping2; }
.live-dots i:nth-child(3) { animation-name: ping3; }

@keyframes ping  { 70% { box-shadow: 0 0 0 7px rgba(83, 201, 138, 0); } 100% { box-shadow: 0 0 0 0 rgba(83, 201, 138, 0); } }
@keyframes ping2 { 70% { box-shadow: 0 0 0 7px rgba(65, 182, 255, 0); } 100% { box-shadow: 0 0 0 0 rgba(65, 182, 255, 0); } }
@keyframes ping3 { 70% { box-shadow: 0 0 0 7px rgba(242, 182, 77, 0); } 100% { box-shadow: 0 0 0 0 rgba(242, 182, 77, 0); } }

.hero-title {
  margin: 22px 0 12px;
  font-size: clamp(40px, 5vw, 62px);
  line-height: 1.16;
  font-weight: 800;
  color: var(--ink);
  letter-spacing: 2px;
}
.hero-title em {
  font-style: normal;
  background: linear-gradient(100deg, #2f7cf0, #2ebca4);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero-sub {
  font-size: clamp(17px, 1.8vw, 20px);
  color: #3d5575;
  font-weight: 500;
  letter-spacing: 1px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-top: 34px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 34px;
  border-radius: 999px;
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 1px;
  transition: transform 0.18s ease, box-shadow 0.18s ease, filter 0.18s ease;
  cursor: pointer;
  border: 0;
}
.btn:hover { transform: translateY(-2px); filter: brightness(1.05); }

.btn-primary {
  color: #fff;
  background: linear-gradient(120deg, #2f7cf0, #1d5fd0);
  box-shadow: 0 16px 30px -14px rgba(36, 103, 214, 0.7);
}
.btn-primary svg { transition: transform 0.2s ease; }
.btn-primary:hover svg { transform: translateX(3px); }

.btn-ghost {
  color: #24518f;
  background: rgba(255, 255, 255, 0.9);
  border: 1.5px solid rgba(47, 124, 240, 0.35);
}

/* ===== Hero 手机扫描卡片 ===== */
.hero-visual { display: flex; justify-content: center; }

.phone {
  width: 330px;
  max-width: 100%;
  border-radius: 40px;
  background: #fff;
  border: 1px solid rgba(20, 60, 120, 0.08);
  box-shadow: 0 40px 80px -34px rgba(18, 56, 116, 0.45);
  padding: 14px;
  position: relative;
  animation: floaty 6s ease-in-out infinite;
}
@keyframes floaty { 0%,100% { transform: translateY(0); } 50% { transform: translateY(-12px); } }

.phone-screen {
  border-radius: 28px;
  overflow: hidden;
  background: var(--sky);
}

/* 屏幕顶栏 */
.screen-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 13px 16px 9px;
}
.screen-bar .t {
  font-size: 15px;
  font-weight: 800;
  color: var(--ink);
  display: inline-flex;
  align-items: center;
  gap: 7px;
}
.screen-bar .t svg { color: var(--blue); }
.status-on {
  font-size: 12px;
  font-weight: 700;
  color: #22a06b;
  background: #e1f6ec;
  padding: 3px 10px;
  border-radius: 999px;
  display: inline-flex;
  align-items: center;
  gap: 5px;
}
.status-on::before {
  content: "";
  width: 6px; height: 6px; border-radius: 50%;
  background: #22a06b;
  animation: ping 1.6s infinite;
}

/* 取景框 */
.preview {
  position: relative;
  margin: 0 2px;
  height: 230px;
  border-radius: 18px;
  overflow: hidden;
  background:
    radial-gradient(120% 120% at 20% 10%, rgba(255, 255, 255, 0.5), transparent 50%),
    linear-gradient(160deg, #b7d7ff 0%, #7faeec 60%, #6a9ce6 100%);
}
.preview .sheet {
  position: absolute;
  left: 50%; top: 50%;
  width: 76%; height: 74%;
  transform: translate(-50%, -50%) rotate(-2deg);
  background: rgba(255, 255, 255, 0.96);
  border-radius: 8px;
  box-shadow: 0 12px 26px -12px rgba(20, 60, 120, 0.5);
  padding: 14px 16px;
  display: flex;
  flex-direction: column;
  gap: 9px;
}
.preview .sheet b {
  display: block;
  height: 7px; width: 42%;
  border-radius: 4px;
  background: #c6d8ee;
}
.preview .sheet i {
  display: block;
  height: 6px; width: 100%;
  border-radius: 4px;
  background: #e2ebf6;
}
.preview .sheet i.w60 { width: 72%; }
.preview .sheet i.w80 { width: 86%; }
.preview .sheet .hl-word {
  position: relative;
  display: inline-block;
  align-self: flex-start;
  margin-top: 3px;
  height: 22px; width: 82px;
  border-radius: 6px;
  background: rgba(47, 124, 240, 0.18);
  border: 1.5px solid rgba(47, 124, 240, 0.55);
}
.preview .sheet .hl-word::after {
  content: "Beautiful";
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  color: #1752b8;
  font-size: 11px;
  font-weight: 700;
}

/* 取景框四角 */
.preview .corner {
  position: absolute;
  width: 26px; height: 26px;
  border: 3px solid #fff;
  border-radius: 3px;
}
.preview .corner.tl { top: 10px; left: 10px; border-right: 0; border-bottom: 0; border-top-left-radius: 10px; }
.preview .corner.tr { top: 10px; right: 10px; border-left: 0; border-bottom: 0; border-top-right-radius: 10px; }
.preview .corner.bl { bottom: 10px; left: 10px; border-right: 0; border-top: 0; border-bottom-left-radius: 10px; }
.preview .corner.br { bottom: 10px; right: 10px; border-left: 0; border-top: 0; border-bottom-right-radius: 10px; }

/* 扫描光束 */
.scan-beam {
  position: absolute;
  left: 6%; right: 6%;
  height: 3px;
  top: 6%;
  background: linear-gradient(90deg, transparent, #58e0c4 30%, #4fd7ff 70%, transparent);
  box-shadow: 0 0 16px 3px rgba(95, 226, 205, 0.8);
  border-radius: 4px;
  animation: scan 2.8s ease-in-out infinite;
  z-index: 2;
}
@keyframes scan {
  0%, 100% { top: 8%; }
  50% { top: 88%; }
}

/* 识别中标签 */
.recognizing {
  position: absolute;
  top: 12px; left: 50%;
  transform: translateX(-50%);
  z-index: 3;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(15, 39, 71, 0.72);
  color: #fff;
  font-size: 11.5px;
  font-weight: 600;
  padding: 4px 12px;
  border-radius: 999px;
  backdrop-filter: blur(4px);
  letter-spacing: 1px;
}
.recognizing i {
  width: 5px; height: 5px;
  border-radius: 50%;
  background: #5cf0cb;
  animation: ping 1.2s infinite;
}

/* OCR 结果卡 */
.ocr-pop {
  position: relative;
  margin: 10px 2px 2px;
  background: #fff;
  border-radius: 16px;
  padding: 15px 16px 13px;
  box-shadow: 0 10px 22px -14px rgba(20, 60, 120, 0.35);
}
.ocr-pop .tag {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 11px;
  font-weight: 700;
  color: #2f7cf0;
  background: #eaf2ff;
  padding: 3px 10px;
  border-radius: 999px;
  margin-bottom: 8px;
}
.ocr-word {
  font-size: 26px;
  font-weight: 800;
  color: var(--ink);
  letter-spacing: 0.5px;
  line-height: 1.1;
}
.ocr-phon-row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-top: 6px;
}
.voice-btn {
  width: 30px; height: 30px;
  border-radius: 50%;
  background: linear-gradient(135deg, #e8f1ff, #d7e7ff);
  color: #1c5fd6;
  display: inline-grid;
  place-items: center;
  cursor: pointer;
  transition: transform 0.15s;
}
.voice-btn:hover { transform: scale(1.12); }
.ocr-phon {
  font-size: 14px;
  color: #4a5d79;
  font-family: "Times New Roman", Georgia, serif;
}
.ocr-mean-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 12px;
  border-top: 1px dashed var(--line);
  padding-top: 11px;
}
.ocr-mean {
  font-size: 15px;
  color: #33475f;
  font-weight: 600;
}
.ocr-more {
  display: inline-flex;
  align-items: center;
  gap: 3px;
  color: #1c5fd6;
  font-weight: 700;
  font-size: 13.5px;
  background: none;
  border: 0;
  cursor: pointer;
}
.ocr-more:hover svg { transform: translateX(2px); }
.ocr-more svg { transition: transform 0.15s; }

/* 漂浮小徽章 */
.float-chip {
  position: absolute;
  z-index: 3;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: #fff;
  border-radius: 14px;
  padding: 9px 15px;
  font-size: 13px;
  font-weight: 700;
  color: var(--ink);
  box-shadow: 0 16px 30px -16px rgba(18, 56, 116, 0.5);
  animation: floaty 7s ease-in-out infinite;
}
.float-chip .ic {
  width: 30px; height: 30px;
  border-radius: 9px;
  display: grid;
  place-items: center;
  color: #fff;
}
.float-chip.fc-1 { top: -6px; left: -58px; }
.float-chip.fc-1 .ic { background: linear-gradient(135deg, #58b4ff, #2f7cf0); }
.float-chip.fc-2 { bottom: 64px; left: -78px; animation-delay: 1.4s; }
.float-chip.fc-2 .ic { background: linear-gradient(135deg, #56d8b8, #1fae93); }

/* ---------------- 通用 Section ---------------- */
.section { padding: 96px 0; position: relative; }
.section .container { position: relative; z-index: 1; }
.bg-sky { background: linear-gradient(180deg, #eaf2fc 0%, #f1f7fe 100%); }
.bg-grey { background: linear-gradient(180deg, #f4f7fa, #eef3f8); }
.bg-white { background: #fff; }

/* 小眉题 + 大标题 */
.sec-head { margin-bottom: 56px; }
.sec-head.center { text-align: center; }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: #2f6fc9;
  font-weight: 800;
  font-size: 15px;
  letter-spacing: 2px;
}
.eyebrow b {
  display: inline-grid;
  place-items: center;
  min-width: 42px;
  padding: 3px 10px;
  border-radius: 999px;
  color: #fff;
  font-size: 14px;
  background: linear-gradient(135deg, #4ba1ff, #2f7cf0);
  box-shadow: 0 8px 16px -8px rgba(47, 124, 240, 0.6);
}
.eyebrow .div {
  width: 26px; height: 2px;
  background: linear-gradient(90deg, #4ba1ff, transparent);
}

.sec-title {
  margin-top: 16px;
  font-size: clamp(30px, 3.6vw, 44px);
  font-weight: 800;
  color: var(--ink);
  letter-spacing: 1px;
  line-height: 1.3;
}
.sec-title .grad {
  background: linear-gradient(100deg, #2f7cf0, #2ebca4);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.sec-desc {
  margin-top: 14px;
  max-width: 560px;
  color: #51647f;
  font-size: 16.5px;
}
.center .sec-desc { margin-left: auto; margin-right: auto; }

/* 出现动画 */
.reveal {
  opacity: 0;
  transform: translateY(26px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.reveal.in { opacity: 1; transform: none; }

/* ---------------- Feature 01 镜头所至 ---------------- */
.feat-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: center;
  gap: 56px;
}

.feat-text .eyebrow { margin-bottom: 6px; }

.point-list { margin-top: 26px; display: grid; gap: 14px; }
.point-list li {
  display: flex;
  gap: 12px;
  align-items: flex-start;
}
.point-list .pc {
  flex: 0 0 auto;
  width: 42px; height: 42px;
  margin-top: 2px;
  border-radius: 13px;
  background: linear-gradient(150deg, #e9f2ff, #d9e9ff);
  color: #2f6fc9;
  display: grid;
  place-items: center;
}
.point-list h4 { color: var(--ink); font-size: 17px; font-weight: 700; }
.point-list p { font-size: 14.5px; color: #5a6b84; }

/* 书本拍摄 mock */
.photo-wrap { position: relative; display: flex; justify-content: center; }
.photo-blob {
  position: absolute;
  width: 360px; height: 360px;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  background: radial-gradient(circle at 35% 35%, #c9e2ff, #b4d4fb 60%, transparent 75%);
  border-radius: 50%;
  z-index: 0;
}
.book-mock {
  position: relative;
  z-index: 1;
  width: 440px;
  max-width: 100%;
  background: #fff;
  border-radius: var(--radius-lg);
  padding: 34px 34px 30px;
  box-shadow: var(--shadow);
  transform: rotate(-2deg);
  animation: floaty 7s ease-in-out infinite;
}
.book-mock .page-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  color: #8a5a1f;
  background: #fff3da;
  padding: 3px 12px;
  border-radius: 999px;
  font-weight: 700;
  margin-bottom: 14px;
}
.book-mock h5 {
  font-size: 20px;
  color: var(--ink);
  font-weight: 800;
  margin-bottom: 6px;
}
.book-line {
  height: 8px;
  border-radius: 5px;
  background: #dfe9f6;
  margin: 9px 0;
}
.book-line.sm { width: 74%; }
.book-line.md { width: 88%; }
.book-line .seg { display: block; height: 100%; border-radius: 5px; background: #dfe9f6; }

/* 高亮词 Beautiful */
.word-hl {
  position: relative;
  display: inline-block;
  font-weight: 800;
  color: #1550b4;
  padding: 2px 10px;
  border-radius: 8px;
  background: linear-gradient(180deg, rgba(47,124,240,0.16), rgba(47,124,240,0.1));
  box-shadow: inset 0 -3px 0 rgba(47, 124, 240, 0.45);
  cursor: default;
}

/* 高亮词上方气泡：音标/释义/发音 */
.word-pop {
  position: absolute;
  top: -62px;
  left: 50%;
  transform: translateX(-50%);
  width: 190px;
  background: var(--ink);
  color: #fff;
  border-radius: 14px;
  padding: 10px 14px;
  z-index: 5;
  box-shadow: 0 16px 26px -14px rgba(15, 39, 71, 0.65);
  animation: floaty 5s ease-in-out infinite;
}
.word-pop::after {
  content: "";
  position: absolute;
  bottom: -7px; left: 50%;
  margin-left: -7px;
  border: 7px solid transparent;
  border-top-color: var(--ink);
  border-bottom: 0;
}
.word-pop .w {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 15px;
  font-weight: 800;
}
.word-pop .w svg { color: #5cf0cb; }
.word-pop .p { font-size: 11.5px; color: #cfe0ff; font-family: Georgia, serif; }
.word-pop .m { font-size: 12px; color: #ffd98a; margin-top: 2px; font-weight: 600; }

.float-chip.fc-3 { bottom: -14px; right: 6px; transform: rotate(1deg); }
.float-chip.fc-3 .ic { background: linear-gradient(135deg, #ffc35c, #f5a623); }

/* ---------------- Feature 02 知识全息投影 ---------------- */
.cards3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 26px;
}

.info-card {
  background: #fff;
  border-radius: var(--radius-lg);
  padding: 30px 28px;
  box-shadow: var(--shadow-sm);
  border: 1px solid rgba(220, 232, 246, 0.8);
  transition: transform 0.22s ease, box-shadow 0.22s ease;
  display: flex;
  flex-direction: column;
}
.info-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 30px 55px -28px rgba(16, 44, 86, 0.32);
}

.card-ic {
  width: 52px; height: 52px;
  border-radius: 16px;
  display: grid;
  place-items: center;
  color: #fff;
  margin-bottom: 18px;
}
.ic-blue  { background: linear-gradient(135deg, #5aacff, #2f7cf0); box-shadow: 0 10px 20px -10px rgba(47, 124, 240, 0.8); }
.ic-teal  { background: linear-gradient(135deg, #52d8b6, #1fae93); box-shadow: 0 10px 20px -10px rgba(31, 174, 147, 0.8); }
.ic-green { background: linear-gradient(135deg, #6cd18b, #3aa75d); box-shadow: 0 10px 20px -10px rgba(58, 167, 93, 0.8); }

.info-card .k-label {
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 2px;
  color: #8191a8;
  text-transform: uppercase;
}
.info-card h3 { font-size: 20px; font-weight: 800; color: var(--ink); margin: 4px 0 16px; }

/* 卡片1：AI 讲解 */
.def-box {
  background: linear-gradient(160deg, #f4f9ff, #eef4ff);
  border-radius: 16px;
  padding: 16px;
  border: 1px solid #e3eeff;
}
.def-box .dword {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 24px;
  font-weight: 800;
  color: var(--ink);
}
.def-box .dword .vbtn {
  width: 30px; height: 30px;
  border-radius: 50%;
  display: grid; place-items: center;
  color: #fff;
  background: linear-gradient(135deg, #5aacff, #2f7cf0);
}
.def-box .dp { font-size: 12.5px; color: #5a7191; font-family: Georgia, serif; margin-top: 2px; }
.def-list { margin-top: 16px; display: grid; gap: 10px; }
.def-list li {
  display: flex;
  gap: 10px;
  font-size: 14px;
  color: #3d5170;
  line-height: 1.55;
}
.def-list li b { color: #2f6fc9; font-weight: 700; white-space: nowrap; }
.def-list .tag {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  height: 22px;
  padding: 0 8px;
  border-radius: 7px;
  background: rgba(47, 124, 240, 0.12);
  color: #2f6fc9;
  font-size: 11.5px;
  font-weight: 800;
}

/* 卡片2：整句翻译 */
.trans-box {
  background: linear-gradient(170deg, #eefaf7, #e6f8f3);
  border-radius: 16px;
  padding: 16px;
  border: 1px solid #d8f2ea;
}
.trans-box .en {
  font-size: 17px;
  font-weight: 700;
  color: #1f2f49;
  line-height: 1.5;
  font-family: Georgia, "Times New Roman", serif;
}
.trans-box .ai-line {
  display: flex;
  align-items: center;
  gap: 12px;
  color: #1fae93;
  font-size: 12px;
  font-weight: 800;
  margin: 14px 0 12px;
  letter-spacing: 1px;
}
.trans-box .ai-line::before,
.trans-box .ai-line::after {
  content: "";
  flex: 1;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(31, 174, 147, 0.4), transparent);
}
.trans-box .cn {
  font-size: 17px;
  color: #0f4b3e;
  font-weight: 700;
}
.trans-box .ai-avatar {
  width: 24px; height: 24px;
  border-radius: 50%;
  background: linear-gradient(135deg, #52d8b6, #1fae93);
  color: #fff;
  font-size: 10px;
  font-weight: 800;
  display: inline-grid;
  place-items: center;
}

/* 卡片3：收藏与复习 */
.stat-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.stat-box {
  background: linear-gradient(160deg, #1b3f76, #10294e);
  color: #fff;
  border-radius: 16px;
  padding: 16px 14px;
  text-align: center;
}
.stat-box .num { font-size: 30px; font-weight: 800; line-height: 1.1; }
.stat-box .cap { font-size: 12px; color: #a9c4ec; margin-top: 2px; }
.progress-wrap { margin-top: 18px; }
.progress-wrap .prow {
  display: flex;
  justify-content: space-between;
  font-size: 12.5px;
  color: #5a6b84;
  margin-bottom: 6px;
  font-weight: 600;
}
.bar { height: 8px; border-radius: 99px; background: #e6edf6; overflow: hidden; }
.bar i {
  display: block;
  height: 100%;
  width: 86%;
  border-radius: 99px;
  background: linear-gradient(90deg, #2ebca4, #2f7cf0);
}

/* ---------------- Feature 03 AI 口语跟练 ---------------- */
.chat-panel {
  background: #fff;
  border-radius: 30px;
  box-shadow: var(--shadow);
  max-width: 900px;
  margin: 0 auto;
  overflow: hidden;
  border: 1px solid rgba(220, 232, 246, 0.8);
}
.chat-head {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 18px 26px;
  background: linear-gradient(120deg, #1c3c70, #16345f);
  color: #fff;
}
.chat-head .mico {
  width: 40px; height: 40px;
  border-radius: 12px;
  background: linear-gradient(135deg, #4ba1ff, #2f7cf0);
  display: grid; place-items: center;
}
.chat-head h4 { font-size: 16px; font-weight: 800; }
.chat-head p { font-size: 12px; color: #bcd3f5; }
.chat-head .state {
  margin-left: auto;
  font-size: 12px;
  font-weight: 700;
  color: #7cf0cf;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.chat-head .state i {
  width: 7px; height: 7px;
  border-radius: 50%;
  background: #46e3b6;
  animation: ping 1.4s infinite;
}

.chat-body {
  display: grid;
  grid-template-columns: 220px 1fr;
  min-height: 360px;
}

/* 左侧 AI 头像 / 聆听 */
.ai-side {
  border-right: 1px solid var(--line);
  background: linear-gradient(180deg, #f7fbff, #eef4fd);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  padding: 24px 14px;
  text-align: center;
}
.ai-orb {
  width: 108px; height: 108px;
  border-radius: 50%;
  position: relative;
  display: grid;
  place-items: center;
  background: radial-gradient(circle at 32% 28%, #7db9ff, #2f7cf0 68%, #1c5fd6);
  color: #fff;
  font-size: 34px;
  font-weight: 800;
  letter-spacing: -1px;
  box-shadow: 0 18px 34px -14px rgba(47, 124, 240, 0.75);
}
.ai-orb::before {
  content: "";
  position: absolute;
  inset: -10px;
  border-radius: 50%;
  border: 2px dashed rgba(47, 124, 240, 0.45);
  animation: spin 14s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }
.ai-side .listen {
  font-size: 14px;
  font-weight: 700;
  color: #24456f;
}
.wave {
  display: flex;
  align-items: center;
  gap: 5px;
  height: 26px;
}
.wave i {
  width: 4px;
  border-radius: 4px;
  background: linear-gradient(180deg, #4ba1ff, #2ebca4);
  animation: wave 1s ease-in-out infinite;
}
.wave i:nth-child(1) { height: 10px; }
.wave i:nth-child(2) { height: 20px; animation-delay: 0.1s; }
.wave i:nth-child(3) { height: 14px; animation-delay: 0.2s; }
.wave i:nth-child(4) { height: 22px; animation-delay: 0.3s; }
.wave i:nth-child(5) { height: 12px; animation-delay: 0.4s; }
@keyframes wave { 0%,100% { transform: scaleY(0.5); } 50% { transform: scaleY(1); } }

/* 右侧消息区 */
.msg-area {
  display: flex;
  flex-direction: column;
  gap: 14px;
  justify-content: center;
  padding: 28px 30px;
  background:
    radial-gradient(300px 200px at 100% 0%, rgba(47, 124, 240, 0.06), transparent 70%),
    #fff;
}
.msg { display: flex; align-items: flex-end; gap: 9px; max-width: 92%; }
.msg.user { align-self: flex-end; flex-direction: row-reverse; }
.msg .av {
  flex: 0 0 auto;
  width: 30px; height: 30px;
  border-radius: 10px;
  display: grid;
  place-items: center;
  font-size: 11px;
  font-weight: 800;
  color: #fff;
}
.msg.user .av { background: linear-gradient(135deg, #7cb7ff, #4a7fd6); }
.msg.ai .av { background: linear-gradient(135deg, #4fe0bd, #1fae93); }
.bubble {
  padding: 11px 16px;
  border-radius: 16px;
  font-size: 14.5px;
  line-height: 1.55;
}
.msg.user .bubble {
  background: linear-gradient(135deg, #2f7cf0, #2366c8);
  color: #fff;
  border-bottom-right-radius: 4px;
  box-shadow: 0 8px 18px -10px rgba(47, 124, 240, 0.7);
}
.msg.ai .bubble {
  background: #f0f5fc;
  color: #2b3d59;
  border-bottom-left-radius: 4px;
  border: 1px solid var(--line);
}
.typing-bubble {
  display: inline-flex;
  gap: 5px;
  padding: 14px 16px;
  background: #f0f5fc;
  border: 1px solid var(--line);
  border-radius: 16px;
  border-bottom-left-radius: 4px;
}
.typing-bubble i {
  width: 7px; height: 7px;
  border-radius: 50%;
  background: #9fb6d4;
  animation: blink 1.2s infinite;
}
.typing-bubble i:nth-child(2) { animation-delay: 0.2s; }
.typing-bubble i:nth-child(3) { animation-delay: 0.4s; }
@keyframes blink { 0%,100% { opacity: 0.25; } 50% { opacity: 1; } }

/* ---------------- CTA 条 ---------------- */
.cta-band {
  background: linear-gradient(120deg, #16345f, #1e4b8f 60%, #205aa8);
  color: #fff;
  position: relative;
  overflow: hidden;
}
.cta-band::before {
  content: "";
  position: absolute;
  right: -60px; top: -60px;
  width: 320px; height: 320px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(79, 190, 155, 0.35), transparent 65%);
}
.cta-inner {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 52px 24px;
  flex-wrap: wrap;
}
.cta-inner h2 { font-size: clamp(24px, 3vw, 34px); font-weight: 800; letter-spacing: 1px; }
.cta-inner p { color: #bcd3f5; margin-top: 8px; font-size: 15.5px; }
.btn-glow {
  background: linear-gradient(120deg, #46e0bc, #23c2a0);
  color: #073b30;
  box-shadow: 0 18px 34px -14px rgba(46, 188, 164, 0.8);
}

/* ---------------- 页脚 ---------------- */
.site-footer {
  background: linear-gradient(180deg, #0e2340, #0a1b31);
  color: #8fa7c8;
  text-align: center;
  padding: 46px 24px 38px;
}
.footer-slogan {
  color: #dbe7f8;
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 2px;
  margin-bottom: 8px;
}
.footer-sub { font-size: 13.5px; color: #6f89ad; margin-bottom: 24px; letter-spacing: 3px; }
.site-footer .rule { width: 90px; height: 3px; border-radius: 3px; margin: 0 auto 26px; background: linear-gradient(90deg, #4ba1ff, #2ebca4); }
.copyright { font-size: 13px; }

/* 备案信息（ICP / 公安网备） */
.footer-filing {
  margin-top: 10px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 6px 12px;
  font-size: 12.5px;
  letter-spacing: 0.5px;
}
.footer-filing a {
  color: #7c96bb;
  transition: color 0.18s ease;
}
.footer-filing a:hover {
  color: #cfe0f7;
  text-decoration: underline;
  text-underline-offset: 3px;
}
.footer-filing .sep { color: #35507a; }

/* ---------------- 内页 (下载/关于) ---------------- */
.page {
  background:
    radial-gradient(760px 420px at 90% -10%, rgba(86, 166, 255, 0.22), transparent 60%),
    radial-gradient(600px 400px at -5% 110%, rgba(70, 205, 180, 0.18), transparent 55%),
    linear-gradient(180deg, #e4effb 0%, #f2f7fe 100%);
  min-height: 72vh;
  padding: 90px 24px;
}
.page-inner { max-width: 880px; margin: 0 auto; }
.page-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-weight: 800;
  color: #2f6fc9;
  letter-spacing: 2px;
}
.page-eyebrow::before {
  content: "";
  width: 26px; height: 3px;
  border-radius: 3px;
  background: linear-gradient(90deg, #4ba1ff, #2ebca4);
}
.page-title {
  margin-top: 14px;
  font-size: clamp(30px, 4vw, 46px);
  font-weight: 800;
  color: var(--ink);
  letter-spacing: 2px;
  line-height: 1.3;
}
.page-title .grad {
  background: linear-gradient(100deg, #2f7cf0, #2ebca4);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.page-desc { margin-top: 12px; color: #51647f; font-size: 16.5px; max-width: 560px; }

/* TODO 占位卡 */
.todo-card {
  margin-top: 40px;
  border: 2px dashed #b9cfe9;
  background: rgba(255, 255, 255, 0.75);
  border-radius: var(--radius-lg);
  padding: 60px 30px;
  text-align: center;
  backdrop-filter: blur(4px);
}
.todo-card .t-ic {
  width: 74px; height: 74px;
  margin: 0 auto 18px;
  border-radius: 22px;
  display: grid;
  place-items: center;
  color: #fff;
  background: linear-gradient(135deg, #6ab4ff, #2f7cf0);
  box-shadow: 0 16px 30px -14px rgba(47, 124, 240, 0.7);
}
.todo-card h3 { color: var(--ink); font-size: 22px; font-weight: 800; letter-spacing: 1px; }
.todo-card p { margin-top: 10px; color: #7185a1; font-size: 15px; }
.todo-tag {
  display: inline-block;
  margin-top: 18px;
  padding: 5px 14px;
  border-radius: 999px;
  background: rgba(242, 182, 77, 0.16);
  color: #b07616;
  font-size: 12.5px;
  font-weight: 800;
  letter-spacing: 1px;
}

/* 联系我们卡片 */
.contact-card {
  margin-top: 40px;
  border: 1px solid rgba(185, 207, 233, 0.6);
  background: #fff;
  border-radius: var(--radius-lg);
  padding: 48px 36px;
  box-shadow: 0 20px 50px -30px rgba(36, 103, 214, 0.25);
}
.contact-card .cc-head { text-align: center; margin-bottom: 26px; }
.contact-card .cc-head .page-desc { margin-left: auto; margin-right: auto; }
.contact-form { max-width: 520px; margin: 0 auto; text-align: left; }
.contact-form .cf-row { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.contact-form input,
.contact-form textarea {
  width: 100%;
  font-family: inherit;
  font-size: 15px;
  color: var(--ink);
  background: #f4f8fd;
  border: 1px solid #dbe7f4;
  border-radius: 12px;
  padding: 13px 15px;
  outline: none;
  margin-bottom: 12px;
  transition: border-color 0.2s, background 0.2s;
  resize: vertical;
}
.contact-form input:focus,
.contact-form textarea:focus {
  border-color: #2f7cf0;
  background: #fff;
}
.contact-form textarea { min-height: 120px; display: block; }
.contact-form .btn { width: 100%; }
.cf-tip {
  display: block;
  text-align: center;
  margin-top: 12px;
  font-size: 13.5px;
  color: #2ebca4;
  min-height: 18px;
}
.cf-tip.err { color: #d64545; }
@media (max-width: 520px) { .contact-form .cf-row { grid-template-columns: 1fr; } }

/* ---------------- 响应式 ---------------- */
@media (max-width: 980px) {
  .hero-inner { grid-template-columns: 1fr; padding-top: 54px; text-align: center; }
  .hero-copy { display: flex; flex-direction: column; align-items: center; }
  .hero-actions { justify-content: center; }
  .hero-visual { margin-top: 10px; }
  .feat-grid { grid-template-columns: 1fr; gap: 40px; }
  .feat-text .point-list { max-width: 520px; }
  .cards3 { grid-template-columns: 1fr; max-width: 460px; margin: 0 auto; }
  .chat-body { grid-template-columns: 1fr; }
  .ai-side { border-right: 0; border-bottom: 1px solid var(--line); padding: 26px 14px; }
  .float-chip.fc-1, .float-chip.fc-2 { left: -20px; }
}

@media (max-width: 720px) {
  .nav-toggle { display: block; }
  .main-nav {
    position: absolute;
    top: 86px;
    left: 0; right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 10px;
    background: linear-gradient(180deg, #16345f, #10284a);
    padding: 16px 20px 20px;
    box-shadow: 0 24px 30px -18px rgba(9, 26, 54, 0.7);
    transform: translateY(-130%);
    opacity: 0;
    pointer-events: none;
    transition: 0.3s ease;
    z-index: 59;
  }
  .main-nav.open {
    transform: none;
    opacity: 1;
    pointer-events: auto;
  }
  .nav-pill { justify-content: center; }
  .section { padding: 72px 0; }
  .sec-head { margin-bottom: 40px; }
  .phone { width: 300px; }
  .msg-area { padding: 22px 18px; }
}