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

:root {
  --bg: #050816;
  --bg-alt: #0b1220;
  --card-bg: #0f172a;
  --card-bg-soft: rgba(15, 23, 42, 0.85);
  --accent: #38bdf8;
  --accent-soft: rgba(56, 189, 248, 0.15);
  --accent-strong: #0ea5e9;
  --text-main: #e5e7eb;
  --text-soft: #9ca3af;
  --border-subtle: rgba(148, 163, 184, 0.35);
  --shadow-soft: 0 18px 45px rgba(15, 23, 42, 0.9);
  --radius-lg: 18px;
  --radius-xl: 24px;
  --radius-pill: 999px;
  --transition-fast: 0.2s ease-out;
  --transition-normal: 0.3s ease-out;
}

html,
body {
  height: 100%;
}

body {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang SC",
    "Microsoft YaHei", sans-serif;
  color: var(--text-main);
  background: radial-gradient(circle at top, #0f172a 0, #020617 45%, #000 100%);
  -webkit-font-smoothing: antialiased;
}

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

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

.container {
  width: 100%;
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(14px);
  background: linear-gradient(
    to bottom,
    rgba(15, 23, 42, 0.95),
    rgba(15, 23, 42, 0.85),
    transparent
  );
  border-bottom: 1px solid rgba(148, 163, 184, 0.2);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 20px 10px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

.brand-logo {
  width: 36px;
  height: 36px;
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}

.brand-name {
  font-size: 18px;
  font-weight: 600;
  letter-spacing: 0.08em;
}

.brand-tagline {
  font-size: 11px;
  color: var(--text-soft);
}

.nav {
  display: flex;
  gap: 18px;
  font-size: 14px;
}

.nav a {
  position: relative;
  padding: 4px 0;
  color: var(--text-soft);
  transition: color var(--transition-fast);
}

.nav a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 0;
  height: 2px;
  border-radius: 999px;
  background: linear-gradient(90deg, #38bdf8, #a855f7);
  transition: width var(--transition-fast);
}

.nav a:hover {
  color: var(--text-main);
}

.nav a:hover::after {
  width: 100%;
}

/* Hero */
.hero {
  padding: 72px 0 40px;
}

.hero-inner {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
  gap: 40px;
  align-items: center;
}

.hero-text h1 {
  font-size: clamp(32px, 4vw, 40px);
  font-weight: 700;
  letter-spacing: 0.04em;
  margin-bottom: 14px;
}

.hero-subtitle {
  font-size: 15px;
  line-height: 1.7;
  color: var(--text-soft);
  max-width: 520px;
}

.hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 22px 0 20px;
}

.hero-tags span {
  font-size: 11px;
  padding: 6px 12px;
  border-radius: var(--radius-pill);
  border: 1px solid rgba(148, 163, 184, 0.6);
  background: radial-gradient(circle at top left, #1e293b 0, #020617 55%);
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.btn-primary,
.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 18px;
  border-radius: var(--radius-pill);
  font-size: 14px;
  cursor: pointer;
  border: 1px solid transparent;
  transition: all var(--transition-normal);
}

.btn-primary {
  background: linear-gradient(135deg, #38bdf8, #0ea5e9);
  color: #0b1120;
  box-shadow: 0 14px 30px rgba(56, 189, 248, 0.35);
}

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 18px 38px rgba(56, 189, 248, 0.5);
}

.btn-secondary {
  border-color: rgba(148, 163, 184, 0.6);
  color: var(--text-main);
  background: rgba(15, 23, 42, 0.7);
}

.btn-secondary:hover {
  background: rgba(15, 23, 42, 0.95);
}

.btn-full {
  width: 100%;
}

.hero-visual {
  display: flex;
  justify-content: center;
}

.hero-card {
  position: relative;
  width: 100%;
  max-width: 360px;
  padding: 20px 18px 18px;
  border-radius: 24px;
  background: radial-gradient(circle at top, rgba(56, 189, 248, 0.2), transparent 50%),
    rgba(15, 23, 42, 0.96);
  border: 1px solid rgba(148, 163, 184, 0.35);
  box-shadow: var(--shadow-soft);
  overflow: hidden;
}

.hero-card::before {
  content: "";
  position: absolute;
  inset: -40%;
  background: conic-gradient(
    from 140deg,
    transparent,
    rgba(56, 189, 248, 0.25),
    rgba(129, 140, 248, 0.35),
    transparent
  );
  opacity: 0.25;
  filter: blur(18px);
  z-index: -1;
}

.hero-card h2 {
  font-size: 16px;
  margin-bottom: 10px;
}

.hero-card ul {
  list-style: none;
  font-size: 13px;
  color: var(--text-soft);
}

.hero-card ul li {
  padding: 6px 0;
  border-bottom: 1px dashed rgba(148, 163, 184, 0.4);
}

.hero-card ul li:last-child {
  border-bottom: none;
}

.hero-note {
  margin-top: 14px;
  font-size: 12px;
  color: var(--accent);
}

/* Sections */
.section {
  padding: 40px 0;
}

.section-alt {
  background: radial-gradient(circle at top, #020617 0, #020617 35%, #000 85%);
}

.section-title {
  font-size: 22px;
  margin-bottom: 10px;
}

.section-subtitle {
  font-size: 14px;
  color: var(--text-soft);
  max-width: 620px;
}

.cards-grid {
  margin-top: 26px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 18px;
}

.card {
  padding: 16px 16px 14px;
  border-radius: var(--radius-lg);
  background: var(--card-bg-soft);
  border: 1px solid var(--border-subtle);
  box-shadow: 0 14px 26px rgba(15, 23, 42, 0.75);
  transition: transform var(--transition-fast), border-color var(--transition-fast),
    box-shadow var(--transition-fast), background var(--transition-fast);
}

.card:hover {
  transform: translateY(-3px);
  border-color: rgba(56, 189, 248, 0.7);
  background: radial-gradient(circle at top, rgba(56, 189, 248, 0.15), #020617 65%);
  box-shadow: 0 18px 40px rgba(15, 23, 42, 0.95);
}

.card h3 {
  font-size: 16px;
  margin-bottom: 6px;
}

.card p {
  font-size: 13px;
  color: var(--text-soft);
  margin-bottom: 8px;
}

.card ul {
  list-style: disc;
  padding-left: 18px;
  font-size: 12px;
  color: var(--text-soft);
}

.card ul li + li {
  margin-top: 3px;
}

/* Cases */
.cases-grid {
  margin-top: 24px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 18px;
}

.case-card {
  padding: 16px 16px 14px;
  border-radius: var(--radius-lg);
  background: rgba(15, 23, 42, 0.94);
  border: 1px solid rgba(148, 163, 184, 0.4);
}

.case-card h3 {
  font-size: 16px;
  margin-bottom: 6px;
}

.case-card p {
  font-size: 13px;
  color: var(--text-soft);
  margin-bottom: 8px;
}

.case-card ul {
  list-style: disc;
  padding-left: 18px;
  font-size: 12px;
  color: var(--text-soft);
}

.case-card ul li + li {
  margin-top: 3px;
}

/* Advantages */
.advantages-grid {
  margin-top: 20px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
}

.adv-item {
  padding: 14px 14px 12px;
  border-radius: var(--radius-lg);
  background: rgba(15, 23, 42, 0.96);
  border: 1px solid rgba(148, 163, 184, 0.3);
}

.adv-item h3 {
  font-size: 14px;
  margin-bottom: 6px;
}

.adv-item p {
  font-size: 13px;
  color: var(--text-soft);
}

/* Process */
.process-list {
  list-style: none;
  margin-top: 16px;
  display: grid;
  gap: 10px;
}

.process-list li {
  padding: 12px 14px 10px;
  border-radius: var(--radius-lg);
  border: 1px solid rgba(148, 163, 184, 0.35);
  background: radial-gradient(circle at top left, rgba(56, 189, 248, 0.12), #020617 70%);
}

.process-list h3 {
  font-size: 14px;
  margin-bottom: 4px;
}

.process-list p {
  font-size: 13px;
  color: var(--text-soft);
}

/* Tags */
.tags-wrap {
  margin-top: 18px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tag {
  font-size: 11px;
  padding: 6px 10px;
  border-radius: var(--radius-pill);
  background: rgba(15, 23, 42, 0.9);
  border: 1px solid rgba(148, 163, 184, 0.45);
}

/* Contact */
.section-contact {
  padding-bottom: 50px;
}

.contact-inner {
  margin-top: 10px;
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
  gap: 20px;
  align-items: flex-start;
}

.contact-list {
  list-style: none;
  margin-top: 14px;
  display: grid;
  gap: 10px;
}

.contact-list li {
  display: grid;
  grid-template-columns: 72px minmax(0, 1fr);
  gap: 8px;
  font-size: 13px;
  color: var(--text-soft);
}

.contact-list .label {
  color: var(--text-main);
}

.contact-form-card {
  padding: 16px 16px 14px;
  border-radius: var(--radius-xl);
  background: rgba(15, 23, 42, 0.96);
  border: 1px solid rgba(148, 163, 184, 0.35);
  box-shadow: 0 16px 36px rgba(15, 23, 42, 0.9);
}

.contact-form-card h3 {
  font-size: 15px;
  margin-bottom: 10px;
}

.contact-form {
  display: grid;
  gap: 10px;
}

.contact-form label {
  display: grid;
  gap: 5px;
  font-size: 12px;
}

.contact-form input,
.contact-form textarea {
  background: rgba(15, 23, 42, 0.9);
  border-radius: 10px;
  border: 1px solid rgba(148, 163, 184, 0.5);
  padding: 8px 10px;
  font-size: 13px;
  color: var(--text-main);
  outline: none;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast),
    background var(--transition-fast);
}

.contact-form input::placeholder,
.contact-form textarea::placeholder {
  color: rgba(148, 163, 184, 0.75);
}

.contact-form input:focus,
.contact-form textarea:focus {
  border-color: var(--accent-strong);
  box-shadow: 0 0 0 1px rgba(56, 189, 248, 0.65);
  background: rgba(15, 23, 42, 0.98);
}

.contact-form textarea {
  resize: vertical;
  min-height: 90px;
}

/* Footer */
.site-footer {
  border-top: 1px solid rgba(148, 163, 184, 0.35);
  background: rgba(2, 6, 23, 0.95);
  padding: 12px 0 14px;
  margin-top: 10px;
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  font-size: 12px;
  color: var(--text-soft);
}

.icp a {
  color: var(--text-soft);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.icp a:hover {
  color: var(--accent);
}

.footer-right a {
  color: var(--accent);
}

.footer-right a:hover {
  text-decoration: underline;
  text-underline-offset: 2px;
}

/* Responsive */
@media (max-width: 860px) {
  .header-inner {
    padding-top: 10px;
    padding-bottom: 8px;
  }

  .nav {
    display: none;
  }

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

  .hero {
    padding-top: 56px;
  }

  .hero-card {
    max-width: none;
  }

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

@media (max-width: 640px) {
  .container {
    padding: 0 16px;
  }

  .hero-text h1 {
    font-size: 26px;
  }

  .section {
    padding: 32px 0;
  }

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