/* ==========================================================================
   ADTITI 屿琛科技 - 企业门户样式规范
   深圳市屿琛科技有限公司 (Shenzhen Yuchen Technology Co., Ltd.)
   ========================================================================== */

:root {
  --color-bg: #070b14;
  --color-bg-card: rgba(15, 23, 42, 0.75);
  --color-bg-card-hover: rgba(30, 41, 59, 0.85);
  --color-bg-card-light: #0f172a;
  --color-bg-glass: rgba(11, 17, 33, 0.82);
  --color-border: rgba(255, 255, 255, 0.08);
  --color-border-hover: rgba(56, 189, 248, 0.4);
  --color-border-glow: rgba(99, 102, 241, 0.3);
  
  --color-primary: #38bdf8;
  --color-primary-dark: #0284c7;
  --color-accent: #6366f1;
  --color-accent-emerald: #10b981;
  --color-accent-amber: #f59e0b;
  --color-accent-purple: #a855f7;
  
  --color-text-title: #f8fafc;
  --color-text-main: #cbd5e1;
  --color-text-muted: #94a3b8;
  --color-text-dim: #64748b;
  
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --max-width: 1240px;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.2);
  --shadow-md: 0 8px 24px -4px rgba(0, 0, 0, 0.35);
  --shadow-lg: 0 20px 40px -10px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 25px rgba(56, 189, 248, 0.25);
  --shadow-glow-purple: 0 0 25px rgba(99, 102, 241, 0.25);
  
  --transition: all 0.28s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Reset & Base */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  scroll-padding-top: 86px;
}

body {
  font-family: var(--font-family);
  background-color: var(--color-bg);
  color: var(--color-text-main);
  line-height: 1.65;
  overflow-x: hidden;
  position: relative;
  background-image: 
    radial-gradient(circle at 15% 15%, rgba(56, 189, 248, 0.07) 0%, transparent 40%),
    radial-gradient(circle at 85% 30%, rgba(99, 102, 241, 0.08) 0%, transparent 45%),
    radial-gradient(circle at 50% 80%, rgba(16, 185, 129, 0.05) 0%, transparent 50%),
    linear-gradient(to bottom, #070b14, #0b1120);
  background-attachment: fixed;
  -webkit-font-smoothing: antialiased;
}

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

img, svg {
  vertical-align: middle;
  max-width: 100%;
}

button, input, select, textarea {
  font-family: inherit;
  font-size: inherit;
}

/* Container */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.5rem;
  padding-right: 1.5rem;
}

/* Header & Navigation */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-bg-glass);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--color-border);
  transition: var(--transition);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 76px;
  gap: 16px;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  flex-shrink: 0;
  white-space: nowrap;
}

.logo-icon-box {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, #0284c7, #6366f1);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  box-shadow: 0 0 16px rgba(56, 189, 248, 0.4);
  flex-shrink: 0;
}

.brand-text {
  display: flex;
  flex-direction: column;
  justify-content: center;
  line-height: 1.2;
}

.brand-name {
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: 0.3px;
  color: var(--color-text-title);
  background: linear-gradient(135deg, #ffffff 30%, #38bdf8 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  white-space: nowrap;
  line-height: 1.2;
}

.brand-sub {
  font-size: 0.68rem;
  color: var(--color-text-muted);
  letter-spacing: 0.3px;
  white-space: nowrap;
  line-height: 1.2;
  margin-top: 2px;
}

.nav-desktop {
  display: flex;
  align-items: center;
  gap: 4px;
  flex-shrink: 1;
}

.nav-link {
  padding: 6px 12px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text-muted);
  border-radius: var(--radius-sm);
  transition: var(--transition);
  white-space: nowrap;
  display: inline-block;
}

.nav-link:hover, .nav-link.active {
  color: var(--color-primary);
  background: rgba(56, 189, 248, 0.08);
}

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

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 9px 20px;
  font-size: 0.92rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  cursor: pointer;
  border: 1px solid transparent;
  transition: var(--transition);
  text-decoration: none;
  white-space: nowrap;
}

.btn-primary {
  background: linear-gradient(135deg, #0284c7, #38bdf8);
  color: #070b14;
  box-shadow: 0 4px 14px rgba(56, 189, 248, 0.3);
}

.btn-primary:hover {
  background: linear-gradient(135deg, #0369a1, #0ea5e9);
  color: #ffffff;
  box-shadow: 0 6px 20px rgba(56, 189, 248, 0.45);
  transform: translateY(-1px);
}

.btn-outline {
  background: rgba(255, 255, 255, 0.03);
  border-color: rgba(255, 255, 255, 0.15);
  color: var(--color-text-title);
}

.btn-outline:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: var(--color-primary);
  color: var(--color-primary);
  transform: translateY(-1px);
}

.btn-sm {
  padding: 6px 14px;
  font-size: 0.84rem;
}

.btn-lg {
  padding: 13px 28px;
  font-size: 1.05rem;
}

.lang-switch {
  display: flex;
  align-items: center;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 3px;
  font-size: 0.8rem;
}

.lang-btn {
  background: transparent;
  border: none;
  color: var(--color-text-muted);
  padding: 4px 8px;
  border-radius: 4px;
  cursor: pointer;
  transition: var(--transition);
}

.lang-btn.active {
  background: var(--color-primary);
  color: #070b14;
  font-weight: 600;
}

.mobile-menu-toggle {
  display: none;
  background: transparent;
  border: 1px solid var(--color-border);
  color: var(--color-text-title);
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  align-items: center;
  justify-content: center;
  cursor: pointer;
}

/* Mobile Drawer */
.mobile-nav-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(8px);
  z-index: 998;
  opacity: 0;
  pointer-events: none;
  transition: var(--transition);
}

.mobile-nav-overlay.open {
  opacity: 1;
  pointer-events: auto;
}

.mobile-nav-drawer {
  position: fixed;
  top: 0;
  right: -320px;
  width: 300px;
  height: 100vh;
  background: #0f172a;
  border-left: 1px solid var(--color-border);
  z-index: 999;
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 20px;
  transition: right 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  overflow-y: auto;
}

.mobile-nav-drawer.open {
  right: 0;
}

.mobile-nav-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 16px;
}

.mobile-nav-links {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.mobile-nav-links .nav-link {
  font-size: 1.05rem;
  padding: 12px 16px;
  border-radius: var(--radius-sm);
}

/* Section Common */
.section {
  padding: 80px 0;
  position: relative;
}

.section-header {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 56px auto;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  background: rgba(56, 189, 248, 0.1);
  border: 1px solid rgba(56, 189, 248, 0.25);
  color: var(--color-primary);
  font-size: 0.8rem;
  font-weight: 600;
  border-radius: 999px;
  margin-bottom: 14px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.badge-purple {
  background: rgba(99, 102, 241, 0.1);
  border-color: rgba(99, 102, 241, 0.25);
  color: #818cf8;
}

.badge-emerald {
  background: rgba(16, 185, 129, 0.1);
  border-color: rgba(16, 185, 129, 0.25);
  color: #34d399;
}

.section-title {
  font-size: 2.25rem;
  font-weight: 700;
  color: var(--color-text-title);
  line-height: 1.3;
  margin-bottom: 16px;
  letter-spacing: -0.5px;
}

.section-subtitle {
  font-size: 1.05rem;
  color: var(--color-text-muted);
  line-height: 1.6;
}

/* Hero Section */
.hero-section {
  padding: 90px 0 100px 0;
  position: relative;
  overflow: hidden;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 48px;
  align-items: center;
}

.hero-content {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  background: rgba(56, 189, 248, 0.08);
  border: 1px solid rgba(56, 189, 248, 0.2);
  border-radius: 999px;
  color: var(--color-primary);
  font-size: 0.85rem;
  font-weight: 500;
  width: fit-content;
}

.hero-tag-pulse {
  width: 8px;
  height: 8px;
  background-color: var(--color-primary);
  border-radius: 50%;
  box-shadow: 0 0 10px var(--color-primary);
  animation: pulse-ring 2s infinite;
}

@keyframes pulse-ring {
  0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(56, 189, 248, 0.7); }
  70% { transform: scale(1); box-shadow: 0 0 0 8px rgba(56, 189, 248, 0); }
  100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(56, 189, 248, 0); }
}

.hero-title {
  font-size: 3.1rem;
  font-weight: 800;
  line-height: 1.2;
  color: var(--color-text-title);
  letter-spacing: -1px;
}

.text-gradient {
  background: linear-gradient(135deg, #38bdf8 0%, #818cf8 50%, #c084fc 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-desc {
  font-size: 1.12rem;
  color: var(--color-text-muted);
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-top: 8px;
  flex-wrap: wrap;
}

.hero-stats-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-top: 28px;
  padding-top: 24px;
  border-top: 1px solid var(--color-border);
}

.stat-item {
  display: flex;
  flex-direction: column;
}

.stat-num {
  font-size: 1.65rem;
  font-weight: 700;
  color: var(--color-text-title);
  font-family: monospace, var(--font-family);
}

.stat-num span {
  color: var(--color-primary);
  font-size: 1.2rem;
}

.stat-label {
  font-size: 0.8rem;
  color: var(--color-text-dim);
  margin-top: 2px;
}

/* Hero Visual Box / Dashboard Preview */
.hero-visual {
  position: relative;
}

.hero-visual-card {
  background: linear-gradient(145deg, rgba(15, 23, 42, 0.9), rgba(30, 41, 59, 0.7));
  border: 1px solid rgba(56, 189, 248, 0.2);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow-lg), var(--shadow-glow);
  position: relative;
  overflow: hidden;
}

.hero-visual-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--color-primary), var(--color-accent), transparent);
}

.card-topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 16px;
  margin-bottom: 16px;
  border-bottom: 1px solid var(--color-border);
}

.window-dots {
  display: flex;
  gap: 6px;
}

.dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}
.dot-red { background-color: #ef4444; }
.dot-yellow { background-color: #f59e0b; }
.dot-green { background-color: #10b981; }

.topbar-title {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--color-text-muted);
  font-family: monospace;
}

.topbar-badge {
  font-size: 0.72rem;
  padding: 2px 8px;
  border-radius: 4px;
  background: rgba(16, 185, 129, 0.15);
  color: #34d399;
  border: 1px solid rgba(16, 185, 129, 0.3);
}

.radar-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  margin-bottom: 16px;
}

.matrix-card {
  background: rgba(0, 0, 0, 0.3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 12px;
}

.matrix-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.78rem;
  color: var(--color-text-muted);
  margin-bottom: 8px;
}

.matrix-value {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-text-title);
  font-family: monospace;
}

.matrix-chart-bar {
  height: 4px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 2px;
  margin-top: 8px;
  overflow: hidden;
}

.chart-fill {
  height: 100%;
  border-radius: 2px;
}
.fill-cyan { background: #38bdf8; width: 88%; }
.fill-indigo { background: #818cf8; width: 94%; }
.fill-emerald { background: #34d399; width: 76%; }
.fill-purple { background: #c084fc; width: 92%; }

.hero-stream-box {
  background: rgba(0, 0, 0, 0.4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 12px 14px;
  font-family: monospace;
  font-size: 0.8rem;
  color: #94a3b8;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.stream-line {
  display: flex;
  align-items: center;
  gap: 8px;
}

.stream-ok {
  color: #34d399;
}
.stream-info {
  color: #38bdf8;
}

/* Grid Matrix for 4 Core Pillars */
.cards-grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.cards-grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.cards-grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
}

/* Glass Card */
.feature-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 28px 24px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  transition: var(--transition);
  position: relative;
  backdrop-filter: blur(12px);
}

.feature-card:hover {
  transform: translateY(-5px);
  border-color: var(--color-border-hover);
  box-shadow: var(--shadow-md), var(--shadow-glow);
  background: var(--color-bg-card-hover);
}

.card-icon {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(56, 189, 248, 0.1);
  color: var(--color-primary);
  border: 1px solid rgba(56, 189, 248, 0.2);
}

.card-icon.purple {
  background: rgba(99, 102, 241, 0.1);
  color: #818cf8;
  border-color: rgba(99, 102, 241, 0.2);
}

.card-icon.emerald {
  background: rgba(16, 185, 129, 0.1);
  color: #34d399;
  border-color: rgba(16, 185, 129, 0.2);
}

.card-icon.amber {
  background: rgba(245, 158, 11, 0.1);
  color: #fbbf24;
  border-color: rgba(245, 158, 11, 0.2);
}

.card-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-text-title);
}

.card-desc {
  font-size: 0.92rem;
  color: var(--color-text-muted);
  line-height: 1.6;
  flex-grow: 1;
}

.card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 8px;
}

.tag-pill {
  font-size: 0.75rem;
  padding: 2px 8px;
  border-radius: 4px;
  background: rgba(255, 255, 255, 0.05);
  color: var(--color-text-dim);
  border: 1px solid rgba(255, 255, 255, 0.06);
}

.card-link-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--color-primary);
  margin-top: 8px;
}

.card-link-btn:hover {
  gap: 10px;
}

/* Tabs System */
.tabs-container {
  display: flex;
  flex-direction: column;
  gap: 32px;
}

.tabs-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
}

.tab-btn {
  padding: 10px 22px;
  font-size: 0.95rem;
  font-weight: 600;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--color-border);
  color: var(--color-text-muted);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: var(--transition);
}

.tab-btn:hover {
  background: rgba(255, 255, 255, 0.08);
  color: var(--color-text-title);
}

.tab-btn.active {
  background: linear-gradient(135deg, rgba(56, 189, 248, 0.2), rgba(99, 102, 241, 0.2));
  border-color: var(--color-primary);
  color: #ffffff;
  box-shadow: 0 0 16px rgba(56, 189, 248, 0.2);
}

.tab-panel {
  display: none;
  animation: fadeIn 0.35s ease-in-out;
}

.tab-panel.active {
  display: block;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Interactive AI Demo Component */
.demo-sandbox {
  background: linear-gradient(145deg, #0b1120, #0f172a);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}

.sandbox-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 24px;
  background: rgba(0, 0, 0, 0.3);
  border-bottom: 1px solid var(--color-border);
}

.sandbox-body {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  padding: 24px;
}

.sandbox-input-area, .sandbox-output-area {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.field-label {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--color-text-title);
  display: flex;
  align-items: center;
  gap: 8px;
}

.sandbox-textarea {
  width: 100%;
  height: 140px;
  background: rgba(0, 0, 0, 0.3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 12px;
  color: var(--color-text-title);
  resize: none;
  outline: none;
  transition: var(--transition);
}

.sandbox-textarea:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 10px rgba(56, 189, 248, 0.2);
}

.demo-output-box {
  background: rgba(0, 0, 0, 0.4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 14px;
  height: 140px;
  overflow-y: auto;
  font-size: 0.9rem;
  color: var(--color-text-main);
  line-height: 1.6;
}

/* ROI Calculator Component */
.calculator-box {
  background: linear-gradient(135deg, rgba(15, 23, 42, 0.95), rgba(30, 41, 59, 0.9));
  border: 1px solid rgba(56, 189, 248, 0.25);
  border-radius: var(--radius-lg);
  padding: 36px;
  box-shadow: var(--shadow-lg);
}

.calc-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: center;
}

.calc-inputs {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.range-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.range-label-row {
  display: flex;
  justify-content: space-between;
  font-size: 0.9rem;
  color: var(--color-text-muted);
}

.range-value-highlight {
  font-weight: 700;
  color: var(--color-primary);
  font-family: monospace;
}

.custom-range {
  width: 100%;
  accent-color: var(--color-primary);
  cursor: pointer;
}

.calc-results-card {
  background: rgba(7, 11, 20, 0.8);
  border: 1px solid rgba(56, 189, 248, 0.3);
  border-radius: var(--radius-md);
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  box-shadow: var(--shadow-glow);
}

.res-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--color-border);
}

.res-row:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.res-label {
  font-size: 0.9rem;
  color: var(--color-text-muted);
}

.res-val {
  font-size: 1.35rem;
  font-weight: 700;
  font-family: monospace;
  color: var(--color-text-title);
}

.res-val.text-green {
  color: #34d399;
}

.res-val.text-cyan {
  color: #38bdf8;
}

/* Enterprise Info & Credential Box */
.credential-banner {
  background: linear-gradient(90deg, rgba(15, 23, 42, 0.9), rgba(30, 41, 59, 0.7));
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 32px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.cred-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.cred-label {
  font-size: 0.82rem;
  color: var(--color-text-dim);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.cred-value {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--color-text-title);
}

.cred-sub {
  font-size: 0.8rem;
  color: var(--color-primary);
}

/* Timeline */
.timeline {
  position: relative;
  max-width: 860px;
  margin: 0 auto;
  padding: 20px 0;
}

.timeline::before {
  content: '';
  position: absolute;
  top: 0;
  bottom: 0;
  left: 50%;
  width: 2px;
  background: var(--color-border);
  transform: translateX(-50%);
}

.timeline-item {
  position: relative;
  margin-bottom: 40px;
  width: 50%;
  padding: 0 30px;
}

.timeline-item.left {
  left: 0;
  text-align: right;
}

.timeline-item.right {
  left: 50%;
  text-align: left;
}

.timeline-dot {
  position: absolute;
  top: 6px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--color-primary);
  box-shadow: 0 0 10px var(--color-primary);
}

.timeline-item.left .timeline-dot {
  right: -7px;
}

.timeline-item.right .timeline-dot {
  left: -7px;
}

.timeline-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 18px 22px;
  display: inline-block;
  text-align: left;
}

.timeline-date {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 4px;
}

.timeline-title {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--color-text-title);
  margin-bottom: 6px;
}

.timeline-desc {
  font-size: 0.88rem;
  color: var(--color-text-muted);
}

/* Contact Form & Office Info */
.contact-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 40px;
}

.contact-form-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 36px;
}

.form-group {
  margin-bottom: 20px;
}

.form-label {
  display: block;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text-title);
  margin-bottom: 8px;
}

.form-input, .form-select, .form-textarea {
  width: 100%;
  background: rgba(0, 0, 0, 0.3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  color: var(--color-text-title);
  outline: none;
  transition: var(--transition);
}

.form-input:focus, .form-select:focus, .form-textarea:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 12px rgba(56, 189, 248, 0.2);
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.contact-info-panel {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.info-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 24px;
  display: flex;
  gap: 16px;
}

.info-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  background: rgba(56, 189, 248, 0.1);
  color: var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.info-content h4 {
  font-size: 1.05rem;
  color: var(--color-text-title);
  margin-bottom: 4px;
}

.info-content p {
  font-size: 0.9rem;
  color: var(--color-text-muted);
}

.info-content .highlight-text {
  color: var(--color-primary);
  font-weight: 500;
}

/* Footer */
.site-footer {
  background: #04070e;
  border-top: 1px solid var(--color-border);
  padding: 70px 0 30px 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
  gap: 40px;
  margin-bottom: 50px;
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.footer-brand p {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  line-height: 1.6;
}

.footer-col h4 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-text-title);
  margin-bottom: 18px;
  position: relative;
}

.footer-col h4::after {
  content: '';
  position: absolute;
  bottom: -6px;
  left: 0;
  width: 24px;
  height: 2px;
  background: var(--color-primary);
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-links a {
  font-size: 0.88rem;
  color: var(--color-text-muted);
}

.footer-links a:hover {
  color: var(--color-primary);
  padding-left: 4px;
}

.footer-contact-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
  font-size: 0.88rem;
  color: var(--color-text-muted);
}

.footer-bottom {
  padding-top: 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.82rem;
  color: var(--color-text-dim);
  flex-wrap: wrap;
  gap: 12px;
}

.footer-bottom-links {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px;
}
.footer-bottom-links a {
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.footer-bottom-links a:hover {
  color: var(--color-primary);
}

/* Toast / Feedback Modal */
.toast-msg {
  position: fixed;
  bottom: 30px;
  right: 30px;
  background: #0f172a;
  border: 1px solid var(--color-primary);
  color: #fff;
  padding: 14px 24px;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-lg), var(--shadow-glow);
  z-index: 1000;
  display: flex;
  align-items: center;
  gap: 10px;
  transform: translateY(100px);
  opacity: 0;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.toast-msg.show {
  transform: translateY(0);
  opacity: 1;
}

/* Modal */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(8px);
  z-index: 1001;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.modal-overlay.open {
  display: flex;
}

.modal-content {
  background: #0f172a;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  max-width: 600px;
  width: 100%;
  padding: 32px;
  position: relative;
  box-shadow: var(--shadow-lg);
}

.modal-close {
  position: absolute;
  top: 20px;
  right: 20px;
  background: transparent;
  border: none;
  color: var(--color-text-dim);
  font-size: 1.5rem;
  cursor: pointer;
}

.modal-close:hover {
  color: #fff;
}

/* Responsive */
@media (max-width: 1200px) {
  .nav-link {
    padding: 6px 8px;
    font-size: 0.86rem;
  }
  .hero-title {
    font-size: 2.6rem;
  }
}

@media (max-width: 1040px) {
  .nav-desktop {
    display: none;
  }
  .mobile-menu-toggle {
    display: inline-flex;
  }
  .cards-grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }
  .cards-grid-3 {
    grid-template-columns: repeat(2, 1fr);
  }
  .hero-grid {
    grid-template-columns: 1fr;
  }
  .calc-grid {
    grid-template-columns: 1fr;
  }
  .credential-banner {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .hero-title {
    font-size: 2.1rem;
  }
  .section-title {
    font-size: 1.75rem;
  }
  .cards-grid-4, .cards-grid-3, .cards-grid-2 {
    grid-template-columns: 1fr;
  }
  .hero-stats-row {
    grid-template-columns: repeat(2, 1fr);
  }
  .sandbox-body {
    grid-template-columns: 1fr;
  }
  .contact-grid {
    grid-template-columns: 1fr;
  }
  .form-row {
    grid-template-columns: 1fr;
  }
  .timeline::before {
    left: 20px;
  }
  .timeline-item {
    width: 100%;
    padding-left: 50px;
    padding-right: 0;
  }
  .timeline-item.left, .timeline-item.right {
    left: 0;
    text-align: left;
  }
  .timeline-item.left .timeline-dot, .timeline-item.right .timeline-dot {
    left: 13px;
    right: auto;
  }
  .credential-banner {
    grid-template-columns: 1fr;
  }
  .footer-grid {
    grid-template-columns: 1fr;
  }
}