@import url("../fonts/inter.css");

/* 亮色现代极简 — Design Tokens（.style/亮色现代极简-style.md） */
:root {
  --color-brand-primary: #000000;
  --color-brand-primary-hover: #27272a;
  --color-brand-on-primary: #ffffff;
  --color-surface-base: #f9fafb;
  --color-surface-card: #ffffff;
  --color-surface-muted: #f4f4f5;
  --color-text-primary: #101112;
  --color-text-secondary: #71717a;
  --color-text-strong: #18181b;
  --color-border-subtle: rgba(0, 0, 0, 0.06);
  --color-border-default: #e4e4e7;
  --color-border-form: #d4d4d8;
  --color-focus-ring: #a1a1aa;
  --color-neutral-100: #f4f4f5;
  --color-neutral-200: #e4e4e7;
  --color-neutral-800: #27272a;
  --color-neutral-900: #18181b;

  --shadow-card: 0 0 0 1px rgba(0, 0, 0, 0.03), 0 2px 4px rgba(0, 0, 0, 0.05),
    0 12px 24px rgba(0, 0, 0, 0.05);
  --shadow-floating: 0 20px 40px -15px rgba(0, 0, 0, 0.08), 0 8px 16px -8px rgba(0, 0, 0, 0.05);
  --shadow-button: 0 20px 60px -30px rgba(0, 0, 0, 0.12);
  --shadow-hover-card: 0 20px 60px -10px rgba(0, 0, 0, 0.08);

  --ease: cubic-bezier(0.16, 1, 0.3, 1);

  /* 兼容既有页面变量名 */
  --brand: var(--color-brand-primary);
  --brand-soft: rgba(0, 0, 0, 0.06);
  --brand-glow: var(--shadow-button);
  --bg-base: var(--color-surface-base);
  --bg-warm: #fafafa;
  --bg-glass: var(--color-surface-card);
  --bg-glass-strong: var(--color-surface-card);
  --glass-border: rgba(228, 228, 231, 0.55);
  --glass-shadow: var(--shadow-card);
  --glass-shadow-hover: var(--shadow-hover-card);
  --text-primary: var(--color-text-primary);
  --text-secondary: var(--color-text-secondary);
  --text-muted: #9f9fa9;

  --font-family-base: "Inter", "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Helvetica,
    Arial, sans-serif;
  --font-family-heading: var(--font-family-base);
  --font-size-base: 1rem;
  --font-size-sm: 0.875rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: clamp(1.75rem, 3vw, 2.25rem);
  --font-size-hero: clamp(2.25rem, 5vw, 3.75rem);
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  --font-weight-extrabold: 800;

  --radius-xs: 0.55rem;
  --radius-sm: 0.65rem;
  --radius-md: 0.85rem;
  --radius-lg: 1rem;
  --radius-xl: 16px;
  --radius-pill: 9999px;

  --container: min(80rem, calc(100% - 2.5rem));
  --header-height: 4rem;
  --header-offset: var(--header-height);
  --header-border: var(--color-border-default);
  --header-bg: rgba(255, 255, 255, 0.82);
  --header-bg-scrolled: rgba(255, 255, 255, 0.94);
  --page-hero-min-height: clamp(420px, 52vh, 500px);
  --page-hero-padding-inline: 24px;
  --page-hero-padding-block: 3.5rem;
  --section-padding-y: clamp(4rem, 8vw, 6rem);
  --transition: 0.35s var(--ease);
  --transition-fast: 0.2s var(--ease);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-family-base);
  font-size: var(--font-size-base);
  line-height: 1.6;
  letter-spacing: -0.015em;
  color: var(--text-primary);
  background: linear-gradient(180deg, #ffffff 0%, #fafafa 100%);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  position: relative;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background:
    radial-gradient(ellipse 80% 50% at 0% -20%, rgba(99, 102, 241, 0.08), transparent 50%),
    radial-gradient(ellipse 60% 40% at 100% 0%, rgba(139, 92, 246, 0.06), transparent 45%),
    radial-gradient(ellipse 50% 30% at 100% 100%, rgba(244, 63, 94, 0.05), transparent 50%);
}

body::after {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  opacity: 0.42;
  background-image: radial-gradient(circle at 1px 1px, rgba(0, 0, 0, 0.06) 1px, transparent 0);
  background-size: 18px 18px;
}

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

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-fast), opacity var(--transition-fast);
}

a:hover:not(.btn):not(.btn-primary):not(.btn-ghost):not(.patent-btn):not(.patents-more-btn) {
  color: var(--brand);
}

ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-wrap {
  padding-top: var(--header-offset);
  overflow-x: hidden;
  position: relative;
  z-index: 1;
}

.container {
  width: var(--container);
  margin-inline: auto;
}

/* 全站第一屏 Hero 统一高度 */
.hero,
.about-hero,
.news-hero,
.sol-hero,
.tech-hero,
.prod-hero,
.patents-hero,
.pay-hero {
  min-height: var(--page-hero-min-height);
  box-sizing: border-box;
  display: grid;
  place-items: center;
  text-align: center;
  padding-inline: var(--page-hero-padding-inline);
  padding-block: var(--page-hero-padding-block);
}

@media (max-width: 640px) {
  :root {
    --page-hero-min-height: clamp(380px, 48vh, 460px);
    --page-hero-padding-block: 2.75rem;
  }
}

/* 卡片表面（亮色现代极简：白底 + 细边框 + 轻阴影） */
.glass,
.glass-strong {
  background: var(--color-surface-card);
  border: 1px solid var(--glass-border);
  box-shadow: var(--shadow-card);
}

/* Header — MeetFlow-style: full-width frosted bar + flat text nav */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  min-height: var(--header-height);
  background: var(--header-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--header-border);
  transition: background var(--transition-fast), border-color var(--transition-fast);
}

.site-header.is-scrolled {
  background: var(--header-bg-scrolled);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: var(--header-height);
  width: var(--container);
  max-width: 100%;
  margin: 0 auto;
  padding: 0;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-family-heading);
  font-weight: var(--font-weight-bold);
  font-size: 1.125rem;
  letter-spacing: -0.02em;
  color: var(--color-text-strong);
  flex-shrink: 0;
  text-decoration: none;
}

.brand-mark {
  width: 2.2rem;
  height: 2.2rem;
  border-radius: 10px;
  background: var(--color-brand-primary);
  display: grid;
  place-items: center;
  color: var(--color-brand-on-primary);
  font-size: 14px;
  box-shadow: var(--shadow-button);
}

.brand-mark i {
  font-size: 15px;
}

.site-nav {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.25rem 1.25rem;
  flex: 1;
  min-width: 0;
  margin-inline: 1rem;
}

.site-nav > a,
.site-nav .nav-dropdown-wrap {
  display: inline-flex;
  align-items: center;
}

.site-nav a {
  padding: 0.35rem 0;
  border-radius: 0;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  line-height: 1;
  color: var(--text-secondary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.site-nav a:hover,
.site-nav a.is-active {
  color: var(--color-text-strong);
  background: transparent;
}

.site-nav a.is-active {
  font-weight: var(--font-weight-semibold);
}

/* Products dropdown */
.nav-dropdown-wrap {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 2px;
}

/* 填满触发区与面板之间的空隙，避免移入面板时 :hover 断开 */
.nav-dropdown-wrap::after {
  content: "";
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%);
  width: max(100%, 260px);
  height: 14px;
}

.nav-dropdown-link {
  padding: 0.35rem 0.15rem 0.35rem 0;
  border-radius: 0;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  line-height: 1;
  color: var(--text-secondary);
  transition: color var(--transition-fast);
}

.nav-dropdown-chevron {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.25rem;
  height: 1.25rem;
  margin-left: -0.1rem;
  padding: 0;
  border: none;
  border-radius: 0;
  font-family: inherit;
  font-size: 10px;
  color: var(--text-secondary);
  background: transparent;
  cursor: pointer;
  transition: color var(--transition-fast), transform var(--transition-fast);
}

.nav-dropdown-link:hover,
.nav-dropdown-chevron:hover,
.nav-dropdown-wrap.is-open .nav-dropdown-chevron,
.nav-dropdown-link.is-active,
.nav-dropdown-wrap:has(.nav-dropdown-link.is-active) .nav-dropdown-chevron {
  color: var(--color-text-strong);
  background: transparent;
}

.nav-dropdown-wrap.is-open .nav-dropdown-chevron i {
  transform: rotate(180deg);
}

.nav-dropdown-chevron i {
  transition: transform var(--transition-fast);
}

.nav-dropdown-menu {
  position: absolute;
  top: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%) translateY(4px);
  min-width: 260px;
  padding: 10px 0;
  background: var(--color-surface-card);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-floating);
  border: 1px solid var(--color-border-subtle);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition:
    opacity var(--transition-fast),
    transform var(--transition-fast),
    visibility var(--transition-fast);
  z-index: 120;
}

.nav-dropdown-wrap.is-open .nav-dropdown-menu,
.nav-dropdown-wrap:hover .nav-dropdown-menu {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transform: translateX(-50%) translateY(0);
}

.nav-dropdown-menu a {
  display: block;
  padding: 12px 20px;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--text-primary);
  border-radius: 0;
  white-space: nowrap;
  transition: background var(--transition-fast), color var(--transition-fast);
}

.nav-dropdown-menu a:hover {
  background: var(--color-surface-muted);
  color: var(--color-text-strong);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-shrink: 0;
}

.lang-btn {
  width: 2.75rem;
  height: 2.75rem;
  border: 1px solid var(--color-border-default);
  border-radius: 14px;
  background: var(--color-surface-card);
  color: var(--text-secondary);
  cursor: pointer;
  transition: background var(--transition-fast), border-color var(--transition-fast),
    color var(--transition-fast);
}

.lang-btn:hover {
  color: var(--color-text-strong);
  border-color: var(--color-border-form);
  background: var(--color-neutral-100);
}

.lang-btn:focus-visible {
  outline: none;
  box-shadow: 0 0 0 2px #fff, 0 0 0 4px var(--color-focus-ring);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  height: 2.8rem;
  padding: 0 1.25rem;
  border: 1px solid transparent;
  border-radius: var(--radius-pill);
  font-family: inherit;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  cursor: pointer;
  transition: background-color var(--transition-fast), border-color var(--transition-fast),
    box-shadow var(--transition-fast), transform var(--transition-fast);
}

.btn:focus-visible {
  outline: none;
  box-shadow: 0 0 0 2px #fff, 0 0 0 4px var(--color-focus-ring);
}

/* 黑色填充主按钮 — 悬停仅加深背景，文字保持白色（MeetFlow 风格） */
.btn-primary,
.patent-btn,
.patents-more-btn {
  background: var(--color-brand-primary);
  border-color: var(--color-brand-primary);
  color: var(--color-brand-on-primary);
  box-shadow: var(--shadow-button);
  transition:
    background-color var(--transition-fast),
    border-color var(--transition-fast),
    box-shadow var(--transition-fast),
    color var(--transition-fast);
}

.btn-primary:hover,
a.btn-primary:hover,
button.btn-primary:hover,
.patent-btn:hover,
a.patent-btn:hover,
.patents-more-btn:hover,
a.patents-more-btn:hover,
.btn-primary:focus-visible,
a.btn-primary:focus-visible,
.patent-btn:focus-visible,
a.patent-btn:focus-visible,
.patents-more-btn:focus-visible,
a.patents-more-btn:focus-visible {
  background: var(--color-brand-primary-hover);
  border-color: var(--color-brand-primary-hover);
  color: var(--color-brand-on-primary);
  transform: none;
  box-shadow: var(--shadow-button);
  text-decoration: none;
}

.btn-primary:active,
a.btn-primary:active,
.patent-btn:active,
a.patent-btn:active,
.patents-more-btn:active,
a.patents-more-btn:active {
  background: var(--color-neutral-900);
  border-color: var(--color-neutral-900);
  color: var(--color-brand-on-primary);
  transform: scale(0.98);
}

.btn-ghost {
  background: transparent;
  color: #3f3f46;
  border-color: rgba(0, 0, 0, 0.08);
}

.btn-ghost:hover {
  background: rgba(0, 0, 0, 0.03);
  transform: none;
  box-shadow: none;
}

/* Section typography */
.section-eyebrow {
  display: inline-block;
  margin-bottom: 12px;
  font-size: 0.75rem;
  font-weight: var(--font-weight-semibold);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-secondary);
}

.section-title {
  margin: 0 0 16px;
  font-family: var(--font-family-heading);
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-extrabold);
  line-height: 1.25;
  letter-spacing: -0.03em;
  color: var(--color-text-strong);
}

.section-lead {
  margin: 0;
  max-width: 640px;
  font-size: var(--font-size-lg);
  color: var(--text-secondary);
  line-height: 1.7;
}

.section-lead--center {
  margin-inline: auto;
  text-align: center;
}

.section-header {
  text-align: center;
  margin-bottom: 48px;
}

.section-header .section-lead {
  margin-inline: auto;
}

/* Cards */
.card-glass {
  border-radius: var(--radius-xl);
  padding: 28px;
  background: var(--color-surface-card);
  border: 1px solid var(--glass-border);
  box-shadow: var(--shadow-card);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.card-glass:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover-card);
}

/* Patent card metadata (home + about) */
.patent-info {
  margin: 0 0 16px;
}

.patent-info__row {
  display: grid;
  grid-template-columns: 4.5em 1fr;
  align-items: center;
  column-gap: 12px;
  padding: 6px 0;
  font-size: var(--font-size-sm);
  line-height: 1.5;
}

.patent-info__row:first-child {
  padding-top: 0;
}

.patent-info__row:last-child {
  padding-bottom: 0;
}

.patent-info__label {
  justify-self: start;
  font-weight: var(--font-weight-medium);
  color: var(--text-muted);
}

.patent-info__value {
  justify-self: end;
  text-align: right;
  font-variant-numeric: tabular-nums;
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-strong);
  word-break: break-all;
}

/* Scroll reveal */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition:
    opacity 0.7s var(--transition),
    transform 0.7s var(--transition);
}

.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;
}

/* Footer */
.site-footer {
  margin-top: 80px;
  padding: 64px 0 32px;
  background: var(--bg-glass-strong);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-top: 1px solid var(--glass-border);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr repeat(3, 1fr);
  gap: 40px;
  margin-bottom: 48px;
}

.footer-brand p {
  margin: 16px 0 20px;
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  max-width: 280px;
  line-height: 1.7;
}

/* 顶栏 / 页脚社交图标（统一圆形样式） */
.header-social,
.footer-social {
  display: flex;
  align-items: center;
  gap: 12px;
}

.footer-social a {
  width: 40px;
  height: 40px;
  box-sizing: border-box;
  flex-shrink: 0;
  border-radius: 50%;
  display: grid;
  place-items: center;
  overflow: hidden;
  font-size: 1.05rem;
  line-height: 1;
  color: var(--text-secondary);
  background: var(--color-surface-card);
  border: 1px solid var(--color-border-default);
  text-decoration: none;
  transition: transform var(--transition-fast), color var(--transition-fast),
    box-shadow var(--transition-fast), background var(--transition-fast),
    border-color var(--transition-fast);
}

.header-social a {
  width: 2.75rem;
  height: 2.75rem;
  box-sizing: border-box;
  flex-shrink: 0;
  border-radius: 14px;
  display: grid;
  place-items: center;
  overflow: hidden;
  font-size: 1rem;
  line-height: 1;
  color: var(--text-secondary);
  background: var(--color-surface-card);
  border: 1px solid var(--color-border-default);
  text-decoration: none;
  transition: color var(--transition-fast), background var(--transition-fast),
    border-color var(--transition-fast);
}

.header-social a i,
.footer-social a i {
  display: block;
  line-height: 1;
}

/* Medium 字形为方标，略缩小以适配圆形容器 */
.header-social a .fa-medium,
.footer-social a .fa-medium {
  font-size: 0.92em;
}

.header-social a:hover {
  color: var(--color-text-strong);
  background: var(--color-neutral-100);
  border-color: var(--color-border-form);
  transform: none;
  box-shadow: none;
}

.footer-social a:hover {
  transform: translateY(-3px);
  color: var(--brand);
  border-color: var(--color-border-form);
  background: var(--color-surface-muted);
  box-shadow: 0 8px 20px rgba(45, 42, 38, 0.1);
}

.footer-col h4 {
  margin: 0 0 16px;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--text-primary);
}

.footer-col li + li {
  margin-top: 10px;
}

.footer-col a {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
}

.footer-contact li {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  line-height: 1.6;
}

.footer-bottom {
  padding-top: 24px;
  border-top: 1px solid rgba(45, 42, 38, 0.08);
  text-align: center;
  font-size: 13px;
  color: var(--text-muted);
}

/* Form — borderless, rounded (for inner pages) */
.input-glass {
  width: 100%;
  padding: 14px 18px;
  border: none;
  border-radius: var(--radius-md);
  font-family: inherit;
  font-size: var(--font-size-base);
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.65);
  box-shadow: inset 0 1px 3px rgba(45, 42, 38, 0.06);
  transition: box-shadow var(--transition-fast), transform var(--transition-fast);
}

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

.input-glass:focus {
  outline: none;
  box-shadow:
    inset 0 1px 3px rgba(45, 42, 38, 0.06),
    0 0 0 3px var(--brand-soft);
}

/* Stub page */
.page-stub {
  min-height: calc(100vh - var(--header-offset) - 200px);
  display: grid;
  place-items: center;
  padding: 80px 24px;
}

.stub-card {
  text-align: center;
  padding: 56px 48px;
  border-radius: var(--radius-lg);
  max-width: 480px;
}

.stub-card h1 {
  margin: 0 0 12px;
  font-size: 1.75rem;
  font-weight: var(--font-weight-bold);
}

.stub-card p {
  margin: 0 0 24px;
  color: var(--text-secondary);
}

/* Responsive */
@media (max-width: 960px) {
  .site-nav {
    display: none;
    margin-inline: 0;
  }

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

@media (max-width: 640px) {
  .header-inner.container {
    width: min(80rem, calc(100% - 2rem));
  }

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