/* ==========================================================================
   ICGO (icgo.me) - Clean, Modern Tech Aesthetic
   Focused, Practical, Fast Loading
   ========================================================================== */
:root {
  --bg: #0b0f17;
  --bg-card: rgba(18, 24, 38, 0.75);
  --bg-card-hover: rgba(26, 36, 56, 0.9);
  --border: rgba(255, 255, 255, 0.08);
  --border-hover: rgba(56, 189, 248, 0.4);
  
  --primary: #38bdf8;
  --primary-glow: rgba(56, 189, 248, 0.25);
  --accent-green: #34d399;
  --accent-purple: #a78bfa;
  --accent-amber: #fbbf24;

  --text-main: #f1f5f9;
  --text-sub: #94a3b8;
  --text-muted: #64748b;

  --font-main: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
}

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

html {
  scroll-behavior: smooth;
  font-family: var(--font-main);
  background-color: var(--bg);
  color: var(--text-main);
  line-height: 1.6;
}

body {
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
  background: 
    radial-gradient(circle at 50% -10%, rgba(56, 189, 248, 0.12) 0%, transparent 45%),
    radial-gradient(circle at 100% 60%, rgba(167, 139, 250, 0.06) 0%, transparent 40%),
    var(--bg);
}

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ================= Header ================= */
.header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(11, 15, 23, 0.85);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--text-main);
}

.brand-badge {
  background: linear-gradient(135deg, #38bdf8, #2563eb);
  color: #fff;
  font-weight: 800;
  font-size: 0.9rem;
  padding: 4px 10px;
  border-radius: 6px;
  letter-spacing: 0.05em;
  font-family: var(--font-mono);
}

.brand-name {
  font-size: 1.15rem;
  font-weight: 700;
}

.header-nav {
  display: flex;
  align-items: center;
  gap: 24px;
}

.header-nav a {
  color: var(--text-sub);
  text-decoration: none;
  font-size: 0.92rem;
  font-weight: 500;
  transition: color 0.2s;
}

.header-nav a:hover {
  color: var(--primary);
}

.header-cta {
  background: rgba(56, 189, 248, 0.1);
  color: var(--primary);
  border: 1px solid rgba(56, 189, 248, 0.3);
  padding: 6px 16px;
  border-radius: 20px;
  font-size: 0.86rem;
  font-weight: 600;
  text-decoration: none;
  transition: all 0.2s;
}

.header-cta:hover {
  background: var(--primary);
  color: #0b0f17;
}

/* ================= Hero ================= */
.hero {
  padding: 85px 0 60px;
  text-align: center;
}

.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(56, 189, 248, 0.08);
  border: 1px solid rgba(56, 189, 248, 0.2);
  color: var(--primary);
  padding: 5px 14px;
  border-radius: 20px;
  font-size: 0.82rem;
  font-weight: 600;
  margin-bottom: 22px;
}

.hero-tag-dot {
  width: 6px;
  height: 6px;
  background: var(--accent-green);
  border-radius: 50%;
  box-shadow: 0 0 8px var(--accent-green);
}

.hero-title {
  font-size: clamp(2rem, 4.5vw, 3.2rem);
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: -0.02em;
  margin-bottom: 18px;
}

.highlight {
  background: linear-gradient(135deg, #38bdf8 0%, #818cf8 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: clamp(1rem, 1.8vw, 1.15rem);
  color: var(--text-sub);
  max-width: 680px;
  margin: 0 auto 34px;
  line-height: 1.6;
}

.hero-btns {
  display: flex;
  justify-content: center;
  gap: 14px;
  flex-wrap: wrap;
}

.btn-main {
  background: linear-gradient(135deg, #38bdf8 0%, #2563eb 100%);
  color: #fff;
  text-decoration: none;
  padding: 12px 26px;
  border-radius: 8px;
  font-weight: 600;
  font-size: 0.95rem;
  transition: all 0.2s;
  box-shadow: 0 4px 16px rgba(37, 99, 235, 0.3);
}

.btn-main:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(56, 189, 248, 0.4);
}

.btn-ghost {
  background: rgba(255, 255, 255, 0.04);
  color: var(--text-main);
  border: 1px solid var(--border);
  text-decoration: none;
  padding: 12px 24px;
  border-radius: 8px;
  font-weight: 600;
  font-size: 0.95rem;
  transition: all 0.2s;
}

.btn-ghost:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.2);
}

/* ================= 4 Core Services Grid ================= */
.services-section {
  padding: 50px 0 70px;
}

.section-head {
  text-align: center;
  margin-bottom: 44px;
}

.section-title {
  font-size: 1.8rem;
  font-weight: 700;
  margin-bottom: 10px;
}

.section-desc {
  color: var(--text-sub);
  font-size: 0.95rem;
}

.services-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 22px;
}

.service-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 28px 24px;
  transition: all 0.25s ease;
  position: relative;
}

.service-card:hover {
  border-color: var(--border-hover);
  background: var(--bg-card-hover);
  transform: translateY(-3px);
  box-shadow: 0 12px 30px -10px rgba(0, 0, 0, 0.5);
}

.card-top {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 16px;
}

.card-icon {
  width: 44px;
  height: 44px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  flex-shrink: 0;
}

.icon-blue { background: rgba(56, 189, 248, 0.12); color: #38bdf8; }
.icon-green { background: rgba(52, 211, 153, 0.12); color: #34d399; }
.icon-purple { background: rgba(167, 139, 250, 0.12); color: #a78bfa; }
.icon-amber { background: rgba(251, 191, 36, 0.12); color: #fbbf24; }

.card-title {
  font-size: 1.25rem;
  font-weight: 700;
}

.card-summary {
  color: var(--text-sub);
  font-size: 0.95rem;
  line-height: 1.65;
  margin-bottom: 0;
}

/* ================= Workflow ================= */
.workflow-section {
  padding: 40px 0 70px;
}

.workflow-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.workflow-step {
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 22px;
  text-align: center;
}

.step-num {
  font-family: var(--font-mono);
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--primary);
  margin-bottom: 8px;
}

.step-title {
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 6px;
}

.step-desc {
  color: var(--text-sub);
  font-size: 0.86rem;
  line-height: 1.5;
}

/* ================= Contact Section ================= */
.contact-section {
  padding: 60px 0 80px;
}

.contact-card {
  background: linear-gradient(180deg, rgba(18, 24, 38, 0.8) 0%, rgba(15, 20, 32, 0.95) 100%);
  border: 1px solid var(--border-hover);
  border-radius: 16px;
  padding: 44px 30px;
  text-align: center;
  max-width: 680px;
  margin: 0 auto;
  box-shadow: 0 10px 40px -10px rgba(0, 0, 0, 0.6);
}

.contact-card h2 {
  font-size: 1.8rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.contact-card p {
  color: var(--text-sub);
  font-size: 0.95rem;
  margin-bottom: 26px;
}

.email-box {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  background: rgba(11, 15, 23, 0.9);
  border: 1px solid var(--primary);
  padding: 10px 20px;
  border-radius: 30px;
  margin-bottom: 20px;
}

.email-text {
  font-family: var(--font-mono);
  font-size: 1.15rem;
  color: #fff;
  font-weight: 700;
  text-decoration: none;
}

.btn-copy {
  background: var(--primary);
  color: #0b0f17;
  border: none;
  padding: 6px 14px;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.2s;
}

.btn-copy:hover {
  background: #7dd3fc;
}

.contact-hint {
  font-size: 0.82rem;
  color: var(--text-muted);
}

/* ================= Footer ================= */
.footer {
  border-top: 1px solid var(--border);
  padding: 30px 0;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.85rem;
}

/* ================= Responsive ================= */
@media (max-width: 768px) {
  .services-grid, .workflow-grid {
    grid-template-columns: 1fr;
  }
  .header-nav {
    display: none;
  }
  .hero {
    padding: 50px 0 40px;
  }
  .contact-card {
    padding: 32px 18px;
  }
  .email-box {
    flex-direction: column;
    padding: 14px;
  }
}