/* ==========================================================================
   方舟智案 · 临床研究方案 AI 助手 — Landing Page 样式
   明亮医疗科技风：白底 + 医疗蓝/青主色 + 内联 SVG 科技元素
   ========================================================================== */

/* ---------- 设计系统变量 ---------- */
:root {
  --color-primary: #1478e8;
  --color-primary-deep: #0b4fa3;
  --color-accent: #12b8c8;
  --color-success: #0fa878;
  --color-bg: #f6f9fc;
  --color-surface: #ffffff;
  --color-text: #1b3a5c;
  --color-text-muted: #5e7a99;
  --color-border: #e2ecf7;
  --grad-main: linear-gradient(135deg, #1478e8 0%, #12b8c8 100%);
  --shadow-card: 0 8px 30px rgba(20, 120, 232, 0.08);
  --shadow-card-hover: 0 18px 44px rgba(20, 120, 232, 0.16);
  --radius-card: 16px;
  --nav-height: 72px;
  --font-stack: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--nav-height) + 16px);
}

body {
  font-family: var(--font-stack);
  font-size: 16px;
  line-height: 1.7;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

a {
  color: inherit;
  text-decoration: none;
}

img {
  max-width: 100%;
  display: block;
}

ul, ol {
  list-style: none;
}

button {
  font-family: inherit;
  border: none;
  background: none;
  cursor: pointer;
}

.container {
  width: min(1180px, 92%);
  margin: 0 auto;
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-weight: 600;
  border-radius: 12px;
  transition: transform 0.25s ease, box-shadow 0.25s ease, background 0.25s ease, color 0.25s ease;
  white-space: nowrap;
}

.btn svg {
  width: 18px;
  height: 18px;
}

.btn-lg {
  padding: 15px 32px;
  font-size: 16px;
}

.btn-sm {
  padding: 9px 20px;
  font-size: 14px;
}

.btn-block {
  display: flex;
  width: 100%;
  padding: 13px 20px;
  font-size: 15px;
}

.btn-primary {
  background: var(--grad-main);
  color: #fff;
  box-shadow: 0 8px 22px rgba(20, 120, 232, 0.32);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 14px 30px rgba(20, 120, 232, 0.42);
}

.btn-ghost {
  background: var(--color-surface);
  color: var(--color-primary);
  border: 1.5px solid rgba(20, 120, 232, 0.35);
}

.btn-ghost:hover {
  border-color: var(--color-primary);
  box-shadow: 0 8px 22px rgba(20, 120, 232, 0.14);
  transform: translateY(-2px);
}

.btn-white {
  background: #fff;
  color: var(--color-primary-deep);
  box-shadow: 0 10px 30px rgba(3, 40, 90, 0.25);
}

.btn-white:hover {
  transform: translateY(-2px);
  box-shadow: 0 16px 36px rgba(3, 40, 90, 0.32);
}

/* ---------- 顶部导航 ---------- */
.nav {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 100;
  height: var(--nav-height);
  background: rgba(255, 255, 255, 0.86);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.nav.scrolled {
  border-bottom-color: var(--color-border);
  box-shadow: 0 6px 24px rgba(20, 80, 160, 0.08);
}

.nav-inner {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

.brand-logo {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: #fff;
  border: 1px solid var(--color-border);
  box-shadow: 0 4px 14px rgba(20, 120, 232, 0.14);
  overflow: hidden;
}

.brand-logo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.25;
}

.brand-name {
  font-size: 19px;
  font-weight: 700;
  color: var(--color-primary-deep);
  letter-spacing: 0.5px;
}

.brand-sub {
  font-size: 11.5px;
  color: var(--color-text-muted);
  letter-spacing: 0.5px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 34px;
}

.nav-links a {
  font-size: 15px;
  font-weight: 500;
  color: var(--color-text);
  position: relative;
  padding: 6px 0;
  transition: color 0.25s ease;
}

.nav-links a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 0;
  height: 2.5px;
  border-radius: 2px;
  background: var(--grad-main);
  transition: width 0.3s ease;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--color-primary);
}

.nav-links a:hover::after,
.nav-links a.active::after {
  width: 100%;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.nav-toggle {
  display: none;
  width: 42px;
  height: 42px;
  border-radius: 10px;
  align-items: center;
  justify-content: center;
  color: var(--color-text);
  border: 1px solid var(--color-border);
  background: #fff;
}

.nav-toggle svg {
  width: 22px;
  height: 22px;
}

.mobile-menu {
  display: none;
  position: absolute;
  top: var(--nav-height);
  left: 0;
  right: 0;
  background: #fff;
  border-bottom: 1px solid var(--color-border);
  box-shadow: 0 18px 40px rgba(20, 80, 160, 0.12);
  padding: 14px 6% 20px;
  flex-direction: column;
  gap: 4px;
}

.mobile-menu.open {
  display: flex;
}

.mobile-menu a {
  padding: 13px 8px;
  font-size: 16px;
  font-weight: 500;
  color: var(--color-text);
  border-radius: 10px;
}

.mobile-menu a:hover {
  background: var(--color-bg);
  color: var(--color-primary);
}

.mobile-menu .btn {
  margin-top: 10px;
}

/* ---------- Hero 首屏 ---------- */
.hero {
  position: relative;
  padding: calc(var(--nav-height) + 84px) 0 96px;
  background:
    radial-gradient(900px 420px at 85% -10%, rgba(18, 184, 200, 0.16), transparent 60%),
    radial-gradient(760px 420px at 8% 6%, rgba(20, 120, 232, 0.14), transparent 60%),
    linear-gradient(180deg, #f2f8ff 0%, var(--color-bg) 100%);
  overflow: hidden;
}

.hero-ecg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 200px;
  pointer-events: none;
}

.hero-node {
  position: absolute;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(20, 120, 232, 0.5), transparent 70%);
  pointer-events: none;
  animation: float-node 7s ease-in-out infinite;
}

.node-1 {
  width: 260px;
  height: 260px;
  top: 18%;
  right: -70px;
  opacity: 0.35;
}

.node-2 {
  width: 180px;
  height: 180px;
  top: 62%;
  left: -50px;
  opacity: 0.3;
  background: radial-gradient(circle, rgba(18, 184, 200, 0.5), transparent 70%);
  animation-delay: 1.6s;
}

.node-3 {
  width: 110px;
  height: 110px;
  top: 30%;
  left: 42%;
  opacity: 0.22;
  animation-delay: 3.2s;
}

@keyframes float-node {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-22px); }
}

.hero-inner {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  align-items: center;
  gap: 60px;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 8px 16px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.9);
  border: 1px solid var(--color-border);
  box-shadow: 0 4px 14px rgba(20, 120, 232, 0.1);
  font-size: 13.5px;
  font-weight: 600;
  color: var(--color-primary-deep);
  letter-spacing: 0.3px;
}

.badge-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-success);
  box-shadow: 0 0 0 4px rgba(15, 168, 120, 0.18);
  animation: pulse-dot 2s ease-in-out infinite;
}

@keyframes pulse-dot {
  0%, 100% { box-shadow: 0 0 0 3px rgba(15, 168, 120, 0.16); }
  50% { box-shadow: 0 0 0 8px rgba(15, 168, 120, 0.05); }
}

.hero-title {
  margin: 26px 0 20px;
  font-size: clamp(34px, 4.2vw, 52px);
  line-height: 1.22;
  font-weight: 800;
  color: var(--color-primary-deep);
  letter-spacing: 0.5px;
}

.grad-text {
  background: var(--grad-main);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

.hero-sub {
  max-width: 560px;
  font-size: 17px;
  color: var(--color-text-muted);
  margin-bottom: 34px;
}

.hero-sub strong {
  color: var(--color-primary);
  font-weight: 700;
}

.hero-ctas {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 48px;
}

.hero-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.stat {
  flex: 1;
  min-width: 110px;
  padding: 18px 20px;
  background: rgba(255, 255, 255, 0.92);
  border: 1px solid var(--color-border);
  border-radius: 14px;
  box-shadow: var(--shadow-card);
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.stat:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-card-hover);
}

.stat-value {
  display: block;
  font-size: 26px;
  font-weight: 800;
  background: var(--grad-main);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
  line-height: 1.2;
}

.stat-label {
  font-size: 12.5px;
  color: var(--color-text-muted);
  margin-top: 4px;
}

/* ---------- Hero Mockup ---------- */
.hero-visual {
  position: relative;
}

.hero-visual::before {
  content: "";
  position: absolute;
  inset: 8% -6% -6% 10%;
  background: var(--grad-main);
  border-radius: 30px;
  opacity: 0.14;
  filter: blur(46px);
  z-index: 0;
}

.mock-window {
  position: relative;
  z-index: 1;
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: 20px;
  box-shadow: 0 30px 70px rgba(20, 80, 160, 0.18);
  overflow: hidden;
}

.mock-titlebar {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 13px 18px;
  background: #fbfdff;
  border-bottom: 1px solid var(--color-border);
}

.mock-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: #ffb4b0;
}

.mock-dot:nth-child(2) { background: #ffd28a; }
.mock-dot:nth-child(3) { background: #9fe0b0; }

.mock-title {
  margin-left: 8px;
  font-size: 12.5px;
  color: var(--color-text-muted);
  font-weight: 500;
}

.mock-body {
  display: grid;
  grid-template-columns: 1fr 128px;
  min-height: 380px;
}

.mock-main {
  padding: 18px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.mock-pico-title {
  font-size: 12px;
  font-weight: 700;
  color: var(--color-primary-deep);
  letter-spacing: 0.5px;
  margin-bottom: 9px;
}

.mock-pico-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

.mock-pico-item {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: center;
  column-gap: 8px;
  padding: 9px 11px;
  border: 1px solid var(--color-border);
  border-radius: 10px;
  background: #fafcff;
  font-size: 12px;
  font-weight: 600;
  color: var(--color-text);
}

.mock-pico-item i {
  grid-column: 1 / -1;
  font-style: normal;
  font-size: 11px;
  font-weight: 400;
  color: var(--color-text-muted);
  margin-top: 2px;
}

.pico-key {
  width: 20px;
  height: 20px;
  border-radius: 6px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--grad-main);
  color: #fff;
  font-size: 11px;
  font-weight: 700;
}

.mock-chat {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.msg {
  padding: 10px 13px;
  border-radius: 12px;
  font-size: 12.5px;
  line-height: 1.55;
}

.msg-user {
  align-self: flex-end;
  background: var(--grad-main);
  color: #fff;
  border-bottom-right-radius: 4px;
  max-width: 82%;
}

.msg-agent {
  align-self: flex-start;
  background: #f4f8ff;
  border: 1px solid var(--color-border);
  border-bottom-left-radius: 4px;
  max-width: 92%;
}

.msg-agent-label {
  display: block;
  font-size: 11px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 6px;
}

.step {
  font-size: 11.5px;
  color: var(--color-text-muted);
  padding: 3px 0;
}

.step.done {
  color: var(--color-success);
}

.step.doing {
  color: var(--color-primary);
  font-weight: 600;
}

.progress {
  margin-top: 8px;
  height: 5px;
  border-radius: 999px;
  background: #e7eef8;
  overflow: hidden;
}

.progress i {
  display: block;
  height: 100%;
  border-radius: 999px;
  background: var(--grad-main);
  animation: progress-shine 1.6s ease-in-out infinite;
}

@keyframes progress-shine {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.6; }
}

.mock-doc {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 14px;
  border: 1px solid var(--color-border);
  border-radius: 12px;
  background: #fbfdff;
}

.mock-doc > svg {
  width: 26px;
  height: 26px;
  color: var(--color-primary);
  flex-shrink: 0;
}

.mock-doc-text {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  line-height: 1.4;
}

.mock-doc-text b {
  font-size: 12.5px;
  color: var(--color-text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.mock-doc-text span {
  font-size: 10.5px;
  color: var(--color-text-muted);
}

.mock-doc-tag {
  padding: 3px 8px;
  border-radius: 6px;
  background: rgba(20, 120, 232, 0.1);
  color: var(--color-primary);
  font-size: 10.5px;
  font-weight: 700;
  flex-shrink: 0;
}

.mock-tasks {
  background: #fbfdff;
  border-left: 1px solid var(--color-border);
  padding: 18px 12px;
  display: flex;
  flex-direction: column;
  gap: 9px;
}

.mock-tasks-title {
  font-size: 11px;
  font-weight: 700;
  color: var(--color-primary-deep);
  margin-bottom: 2px;
}

.task-row {
  display: flex;
  align-items: center;
  gap: 7px;
  font-size: 11px;
  color: var(--color-text-muted);
}

.task-row .tick {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 10px;
  flex-shrink: 0;
}

.task-row.done .tick {
  background: rgba(15, 168, 120, 0.14);
  color: var(--color-success);
}

.task-row.done {
  color: var(--color-success);
}

.task-row.doing .tick {
  background: rgba(20, 120, 232, 0.14);
  color: var(--color-primary);
}

.task-row.doing {
  color: var(--color-primary);
  font-weight: 600;
}

.tick.spin {
  animation: spin 1.4s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.mock-tasks-foot {
  margin-top: auto;
  padding-top: 10px;
  border-top: 1px dashed var(--color-border);
  font-size: 10.5px;
  color: var(--color-text-muted);
}

/* ---------- 通用区块 ---------- */
.section {
  padding: 96px 0;
}

.section-alt {
  background: var(--color-surface);
}

.section-head {
  max-width: 720px;
  margin: 0 auto 56px;
  text-align: center;
}

.section-tag {
  display: inline-block;
  padding: 6px 16px;
  border-radius: 999px;
  background: rgba(20, 120, 232, 0.08);
  color: var(--color-primary);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 1px;
  margin-bottom: 18px;
}

.section-title {
  font-size: clamp(27px, 3.2vw, 38px);
  line-height: 1.3;
  font-weight: 800;
  color: var(--color-primary-deep);
  letter-spacing: 0.3px;
}

.section-sub {
  margin-top: 16px;
  font-size: 16px;
  color: var(--color-text-muted);
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 26px;
}

.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.grid-5 {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 18px;
}

/* ---------- 价值对比 ---------- */
.compare-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
  overflow: hidden;
}

.compare-head,
.compare-row {
  display: grid;
  grid-template-columns: 1.1fr 1fr 1.4fr;
  align-items: center;
}

.compare-head {
  background: #f4f8ff;
  border-bottom: 1px solid var(--color-border);
  font-weight: 700;
  font-size: 14.5px;
  color: var(--color-primary-deep);
}

.compare-row {
  border-bottom: 1px solid var(--color-border);
  transition: background 0.25s ease;
}

.compare-row:last-child {
  border-bottom: none;
}

.compare-row:hover {
  background: #f8fbff;
}

.compare-col {
  padding: 18px 24px;
  font-size: 14.5px;
}

.col-dim {
  font-weight: 600;
  color: var(--color-text);
}

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

.col-new {
  color: var(--color-text);
  font-weight: 500;
}

.new-logo {
  display: inline-flex;
  vertical-align: middle;
  width: 24px;
  height: 24px;
  border-radius: 6px;
  overflow: hidden;
  margin-right: 7px;
  border: 1px solid var(--color-border);
}

.check {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: rgba(15, 168, 120, 0.14);
  color: var(--color-success);
  font-size: 12px;
  font-weight: 800;
  margin-right: 8px;
}

/* ---------- 功能卡片 ---------- */
.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: 32px 28px;
  box-shadow: var(--shadow-card);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-card-hover);
}

.card-icon {
  width: 52px;
  height: 52px;
  border-radius: 14px;
  background: var(--grad-main);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  box-shadow: 0 8px 18px rgba(20, 120, 232, 0.28);
}

.card-icon svg {
  width: 26px;
  height: 26px;
  color: #fff;
}

.card h3 {
  font-size: 19px;
  font-weight: 700;
  color: var(--color-primary-deep);
  margin-bottom: 10px;
}

.card p {
  font-size: 14.5px;
  color: var(--color-text-muted);
}

/* ---------- 工作流程 ---------- */
.steps {
  display: flex;
  align-items: stretch;
  gap: 0;
}

.step-card {
  flex: 1;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: 30px 26px;
  box-shadow: var(--shadow-card);
  position: relative;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.step-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-card-hover);
}

.step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: var(--grad-main);
  color: #fff;
  font-size: 17px;
  font-weight: 800;
  margin-bottom: 18px;
  box-shadow: 0 8px 18px rgba(20, 120, 232, 0.28);
}

.step-card h3 {
  font-size: 17.5px;
  font-weight: 700;
  color: var(--color-primary-deep);
  margin-bottom: 10px;
}

.step-card p {
  font-size: 14px;
  color: var(--color-text-muted);
}

.step-arrow {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 52px;
  flex-shrink: 0;
  color: var(--color-accent);
}

.step-arrow svg {
  width: 24px;
  height: 24px;
}

/* ---------- 10 域评审 ---------- */
.domain-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 14px;
  padding: 22px 18px;
  box-shadow: var(--shadow-card);
  transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
}

.domain-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-card-hover);
  border-color: rgba(20, 120, 232, 0.4);
}

.domain-num {
  font-size: 13px;
  font-weight: 800;
  background: var(--grad-main);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
  letter-spacing: 1px;
}

.domain-card h3 {
  font-size: 15.5px;
  font-weight: 700;
  color: var(--color-primary-deep);
  margin: 8px 0 7px;
}

.domain-card p {
  font-size: 12.5px;
  color: var(--color-text-muted);
  line-height: 1.55;
}

.severity {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 16px;
  margin-top: 40px;
}

.sev {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 20px;
  border-radius: 12px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  font-size: 13.5px;
  color: var(--color-text-muted);
}

.sev-tag {
  font-weight: 800;
  font-size: 13px;
}

.sev-critical .sev-tag { color: #e0454f; }
.sev-major .sev-tag { color: #e89b1f; }
.sev-minor .sev-tag { color: #5e7a99; }

/* ---------- 知识库与数据 ---------- */
.data-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: 34px 30px;
  box-shadow: var(--shadow-card);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.data-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-card-hover);
}

.data-icon {
  width: 56px;
  height: 56px;
  border-radius: 16px;
  background: rgba(20, 120, 232, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 22px;
}

.data-icon svg {
  width: 28px;
  height: 28px;
  color: var(--color-primary);
}

.data-card h3 {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-primary-deep);
  margin-bottom: 6px;
}

.data-stat {
  font-size: 14px;
  font-weight: 700;
  background: var(--grad-main);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
  margin-bottom: 12px;
}

.data-card p:last-child {
  font-size: 14px;
  color: var(--color-text-muted);
}

/* ---------- 适用场景 ---------- */
.scenario-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: 30px 28px;
  box-shadow: var(--shadow-card);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.scenario-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-card-hover);
}

.scenario-icon {
  font-size: 30px;
  display: block;
  margin-bottom: 16px;
}

.scenario-card h3 {
  font-size: 18px;
  font-weight: 700;
  color: var(--color-primary-deep);
  margin-bottom: 10px;
}

.scenario-card p {
  font-size: 14px;
  color: var(--color-text-muted);
}

/* ---------- 安全与合规 ---------- */
.sec-card {
  text-align: center;
  padding: 30px 22px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.sec-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-card-hover);
}

.sec-icon {
  width: 54px;
  height: 54px;
  margin: 0 auto 16px;
  border-radius: 50%;
  background: rgba(20, 120, 232, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
}

.sec-icon svg {
  width: 26px;
  height: 26px;
  color: var(--color-primary);
}

.sec-card h3 {
  font-size: 17px;
  font-weight: 700;
  color: var(--color-primary-deep);
  margin-bottom: 9px;
}

.sec-card p {
  font-size: 13.5px;
  color: var(--color-text-muted);
}

/* ---------- CTA 横幅 ---------- */
.cta-banner {
  position: relative;
  padding: 96px 0;
  background: var(--grad-main);
  overflow: hidden;
}

.cta-glow {
  position: absolute;
  top: -60%;
  left: 50%;
  transform: translateX(-50%);
  width: 620px;
  height: 620px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.28), transparent 62%);
  pointer-events: none;
}

.cta-inner {
  position: relative;
  z-index: 1;
  text-align: center;
}

.cta-inner h2 {
  font-size: clamp(26px, 3.4vw, 40px);
  font-weight: 800;
  color: #fff;
  line-height: 1.3;
  margin-bottom: 14px;
}

.cta-inner p {
  font-size: 16px;
  color: rgba(255, 255, 255, 0.92);
  margin-bottom: 34px;
}

/* ---------- Footer ---------- */
.footer {
  padding: 64px 0 30px;
  background: #0c2340;
  color: rgba(255, 255, 255, 0.72);
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding-bottom: 34px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.12);
  margin-bottom: 30px;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.footer-name {
  font-size: 19px;
  font-weight: 700;
  color: #fff;
  letter-spacing: 0.5px;
}

.footer-sub {
  font-size: 12px;
  color: rgba(255, 255, 255, 0.6);
}

.footer-links {
  display: flex;
  gap: 28px;
}

.footer-links a {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.72);
  transition: color 0.25s ease;
}

.footer-links a:hover {
  color: #6cc3ff;
}

.disclaimer {
  font-size: 12.5px;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.55);
  max-width: 980px;
}

.copyright {
  margin-top: 18px;
  font-size: 13px;
  color: rgba(255, 255, 255, 0.5);
}

/* ---------- 滚动显现动画 ---------- */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- 体验申请 Modal ---------- */
.modal {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.modal.open {
  display: flex;
  animation: modal-fade 0.25s ease;
}

@keyframes modal-fade {
  from { opacity: 0; }
  to { opacity: 1; }
}

.modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(12, 35, 64, 0.55);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
}

.modal-dialog {
  position: relative;
  z-index: 1;
  width: min(440px, 100%);
  background: var(--color-surface);
  border-radius: 20px;
  box-shadow: 0 30px 80px rgba(12, 35, 64, 0.3);
  padding: 40px 36px 34px;
  text-align: center;
  animation: modal-pop 0.3s cubic-bezier(0.2, 0.8, 0.3, 1.1);
}

@keyframes modal-pop {
  from { transform: translateY(20px) scale(0.96); opacity: 0; }
  to { transform: translateY(0) scale(1); opacity: 1; }
}

.modal-close {
  position: absolute;
  top: 14px;
  right: 14px;
  width: 34px;
  height: 34px;
  border-radius: 10px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-muted);
  transition: background 0.25s ease, color 0.25s ease;
}

.modal-close svg {
  width: 18px;
  height: 18px;
}

.modal-close:hover {
  background: var(--color-bg);
  color: var(--color-text);
}

.modal-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 20px;
  border-radius: 50%;
  background: rgba(20, 120, 232, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
}

.modal-icon svg {
  width: 30px;
  height: 30px;
  color: var(--color-primary);
}

.modal-title {
  font-size: 22px;
  font-weight: 800;
  color: var(--color-primary-deep);
  margin-bottom: 12px;
}

.modal-desc {
  font-size: 15px;
  color: var(--color-text-muted);
  margin-bottom: 18px;
}

.modal-email {
  display: inline-block;
  font-size: 19px;
  font-weight: 700;
  color: var(--color-primary);
  padding: 14px 28px;
  border-radius: 12px;
  border: 1.5px solid rgba(20, 120, 232, 0.35);
  background: rgba(20, 120, 232, 0.06);
  margin-bottom: 18px;
  transition: transform 0.25s ease, box-shadow 0.25s ease, background 0.25s ease;
}

.modal-email:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 24px rgba(20, 120, 232, 0.2);
  background: rgba(20, 120, 232, 0.1);
}

.modal-hint {
  font-size: 13px;
  color: var(--color-text-muted);
  line-height: 1.7;
}

/* ---------- 响应式 ---------- */
@media (max-width: 968px) {
  .nav-links {
    display: none;
  }

  .nav-toggle {
    display: inline-flex;
  }

  .nav-cta {
    display: none;
  }

  .hero-inner {
    grid-template-columns: 1fr;
    gap: 56px;
  }

  .hero {
    padding-top: calc(var(--nav-height) + 56px);
  }

  .hero-visual {
    max-width: 640px;
    margin: 0 auto;
    width: 100%;
  }

  .grid-3,
  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }

  .grid-5 {
    grid-template-columns: repeat(3, 1fr);
  }

  .steps {
    flex-direction: column;
    gap: 14px;
  }

  .step-arrow {
    width: 100%;
    height: 34px;
    transform: rotate(90deg);
  }

  .compare-head,
  .compare-row {
    grid-template-columns: 1fr 1fr;
  }

  .compare-head .col-dim,
  .compare-row .col-dim {
    display: none;
  }
}

@media (max-width: 768px) {
  .section {
    padding: 72px 0;
  }

  .hero-sub {
    font-size: 16px;
  }

  .mock-body {
    grid-template-columns: 1fr;
  }

  .mock-tasks {
    border-left: none;
    border-top: 1px solid var(--color-border);
    flex-direction: row;
    flex-wrap: wrap;
    align-items: center;
    padding: 14px 18px;
  }

  .mock-tasks-title {
    width: 100%;
  }

  .mock-tasks-foot {
    margin-top: 0;
    padding-top: 0;
    border-top: none;
    margin-left: auto;
  }

  .grid-5 {
    grid-template-columns: repeat(2, 1fr);
  }

  .severity {
    flex-direction: column;
    align-items: stretch;
  }

  .sev {
    justify-content: flex-start;
  }
}

@media (max-width: 520px) {
  .grid-3,
  .grid-4,
  .grid-5 {
    grid-template-columns: 1fr;
  }

  .hero-ctas {
    flex-direction: column;
    align-items: stretch;
  }

  .hero-stats {
    flex-direction: column;
  }

  .stat {
    min-width: 100%;
  }

  .compare-head,
  .compare-row {
    grid-template-columns: 1fr 1.2fr;
    font-size: 13px;
  }

  .compare-col {
    padding: 14px 14px;
  }

  .col-new {
    font-size: 13px;
  }

  .footer-inner {
    flex-direction: column;
    align-items: flex-start;
  }

  .footer-links {
    flex-wrap: wrap;
    gap: 16px;
  }

  .modal-dialog {
    padding: 34px 24px 28px;
  }

  .modal-title {
    font-size: 20px;
  }

  .modal-email {
    font-size: 17px;
    padding: 12px 22px;
  }
}

/* ---------- 减弱动效偏好 ---------- */
@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  html {
    scroll-behavior: auto;
  }
}