/* ═══════════════════════════════════════
   ExpTech 地震儀購買及安裝注意事項
   Style Guide — Teal/Cyan Dark Theme
   ═══════════════════════════════════════ */

:root {
  --bg-deep: #0b1120;
  --bg-mid: #0e1529;
  --bg-card: #111b2e;
  --bg-card-hover: #152036;
  --bg-elevated: #162240;
  --accent: #2dd4bf;
  --accent-dim: #1aab9a;
  --accent-glow: rgba(45, 212, 191, 0.2);
  --accent-glow-strong: rgba(45, 212, 191, 0.35);
  --cyan: #22d3ee;
  --blue: #3b82f6;
  --emerald: #34d399;
  --amber: #fbbf24;
  --red: #f87171;
  --text-primary: #e8edf5;
  --text-secondary: #8b9dc3;
  --text-muted: #5a6d8a;
  --border: rgba(45, 212, 191, 0.08);
  --border-hover: rgba(45, 212, 191, 0.2);
  --radius: 16px;
  --radius-sm: 10px;
  --font: 'Noto Sans TC', sans-serif;
  --mono: 'JetBrains Mono', monospace;
}

* {
    user-select: none;
    margin: 0;
    padding: 0;
    box-sizing: border-box;
  }

html {
  scroll-behavior: smooth;
  scrollbar-width: thin;
  scrollbar-color: var(--accent-dim) var(--bg-deep);
}

body {
  font-family: var(--font);
  background: var(--bg-deep);
  color: var(--text-primary);
  line-height: 1.8;
  overflow-x: hidden;
}

a { color: inherit; }

/* ═══════ STICKY NAV (unified) ═══════ */
.sticky-nav {
  position: sticky;
  top: 0;
  z-index: 200;
  background: rgba(11, 17, 32, 0.85);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  padding: 0 2rem;
}

/* ═══════ HERO ═══════ */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 50% at 50% 20%, rgba(45, 212, 191, 0.07) 0%, transparent 60%),
    radial-gradient(ellipse 60% 50% at 20% 80%, rgba(34, 211, 238, 0.05) 0%, transparent 50%),
    radial-gradient(ellipse 50% 50% at 85% 60%, rgba(59, 130, 246, 0.05) 0%, transparent 50%),
    radial-gradient(ellipse 30% 30% at 70% 20%, rgba(129, 140, 248, 0.03) 0%, transparent 40%),
    radial-gradient(ellipse 40% 40% at 30% 40%, rgba(45, 212, 191, 0.03) 0%, transparent 50%);
}

.hero::after {
  content: '';
  position: absolute;
  inset: 0;
  background: 
    linear-gradient(180deg, transparent 0%, rgba(11, 17, 32, 0.4) 100%);
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 900px;
  padding: 2rem;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(45, 212, 191, 0.08);
  border: 1px solid rgba(45, 212, 191, 0.2);
  padding: 8px 20px;
  border-radius: 100px;
  font-size: 0.85rem;
  color: var(--accent);
  margin-bottom: 2rem;
  letter-spacing: 0.05em;
  animation: fadeUp 0.8s ease both;
}

.hero-badge::before {
  content: '';
  width: 7px;
  height: 7px;
  background: var(--accent);
  border-radius: 50%;
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.4; transform: scale(1.6); }
}

.hero h1 {
  font-size: clamp(2.5rem, 6vw, 4.2rem);
  font-weight: 900;
  line-height: 1.25;
  margin-bottom: 1.5rem;
  animation: fadeUp 0.8s ease 0.15s both;
}

.hero h1 .highlight {
  background: linear-gradient(135deg, var(--accent), var(--cyan));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-desc {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 620px;
  margin: 0 auto 2.5rem;
  animation: fadeUp 0.8s ease 0.3s both;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
  animation: fadeUp 0.8s ease 0.45s both;
}

.btn {
  padding: 13px 30px;
  border-radius: 100px;
  font-size: 1.2rem;
  font-weight: 600;
  text-decoration: none;
  transition: all 0.3s ease;
  cursor: pointer;
  border: none;
  font-family: var(--font);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.btn-primary {
  background: var(--accent);
  color: var(--bg-deep);
  box-shadow: 0 4px 20px var(--accent-glow);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px var(--accent-glow-strong);
}

.btn-outline {
  background: transparent;
  color: var(--text-primary);
  border: 1px solid rgba(255,255,255,0.12);
}

.btn-outline:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: rgba(45, 212, 191, 0.04);
}

.scroll-indicator {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: var(--text-muted);
  font-size: 0.72rem;
  letter-spacing: 0.15em;
  animation: fadeUp 0.8s ease 0.6s both;
  z-index: 2;
}

.scroll-indicator .arrow {
  width: 18px;
  height: 18px;
  border-right: 1.5px solid var(--text-muted);
  border-bottom: 1.5px solid var(--text-muted);
  transform: rotate(45deg);
  animation: bounce 2s ease-in-out infinite;
}

@keyframes bounce {
  0%, 100% { transform: rotate(45deg) translateY(0); }
  50% { transform: rotate(45deg) translateY(5px); }
}

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(25px); }
  to { opacity: 1; transform: translateY(0); }
}

/* (sticky-nav already defined above) */

.nav-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 1.8rem;
  overflow-x: auto;
  scrollbar-width: none;
  padding: 0.9rem 0;
}

.nav-inner::-webkit-scrollbar { display: none; }

.nav-logo {
  font-weight: 900;
  font-size: 1rem;
  white-space: nowrap;
  color: var(--accent);
  flex-shrink: 0;
  text-decoration: none;
  transition: opacity 0.2s;
}

.nav-logo:hover { opacity: 0.8; }

.nav-link {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.82rem;
  white-space: nowrap;
  transition: color 0.2s;
  position: relative;
  padding: 4px 0;
}

.nav-link:hover { color: var(--text-primary); }

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent);
  transition: width 0.3s ease;
  border-radius: 2px;
}

.nav-link:hover::after { width: 100%; }

/* ═══════ SECTIONS ═══════ */
.section {
  max-width: 1200px;
  margin: 0 auto;
  padding: 5rem 2rem;
}

.section-label {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.15em;
  margin-bottom: 1rem;
}

.section-label::before {
  content: '';
  width: 22px;
  height: 2px;
  background: var(--accent);
  border-radius: 2px;
}

.section h2 {
  font-size: clamp(1.7rem, 3.5vw, 2.6rem);
  font-weight: 900;
  margin-bottom: 0.8rem;
  line-height: 1.35;
}

.section-desc {
  color: var(--text-secondary);
  font-size: 1rem;
  max-width: 700px;
  margin-bottom: 2.5rem;
}

/* ═══════ GRADIENT CARD BACKGROUNDS ═══════ */
.card-grad-teal {
  background: linear-gradient(145deg, rgba(45, 212, 191, 0.06) 0%, var(--bg-card) 50%) !important;
}
.card-grad-cyan {
  background: linear-gradient(145deg, rgba(34, 211, 238, 0.06) 0%, var(--bg-card) 50%) !important;
}
.card-grad-blue {
  background: linear-gradient(145deg, rgba(59, 130, 246, 0.06) 0%, var(--bg-card) 50%) !important;
}
.card-grad-emerald {
  background: linear-gradient(145deg, rgba(52, 211, 153, 0.06) 0%, var(--bg-card) 50%) !important;
}
.card-grad-amber {
  background: linear-gradient(145deg, rgba(251, 191, 36, 0.05) 0%, var(--bg-card) 50%) !important;
}
.card-grad-indigo {
  background: linear-gradient(145deg, rgba(129, 140, 248, 0.06) 0%, var(--bg-card) 50%) !important;
}

/* ═══════ PURPOSE CARDS ═══════ */
.purpose-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.2rem;
  margin-top: 1.5rem;
}

.purpose-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.8rem;
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.purpose-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--accent), var(--cyan));
  opacity: 0;
  transition: opacity 0.3s;
}

.purpose-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-hover);
  transform: translateY(-3px);
}

.purpose-card:hover::before { opacity: 1; }

.purpose-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  margin-bottom: 1rem;
}

.purpose-icon.teal { background: rgba(45, 212, 191, 0.1); }
.purpose-icon.cyan { background: rgba(34, 211, 238, 0.1); }
.purpose-icon.blue { background: rgba(59, 130, 246, 0.1); }
.purpose-icon.emerald { background: rgba(52, 211, 153, 0.1); }
.purpose-icon.amber { background: rgba(251, 191, 36, 0.1); }
.purpose-icon.indigo { background: rgba(129, 140, 248, 0.1); }

.purpose-card h3 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.purpose-card p {
  color: var(--text-secondary);
  font-size: 0.88rem;
  line-height: 1.7;
}

/* ═══════ FLOW DIAGRAM ═══════ */
.flow-section {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2.5rem;
  margin-top: 2.5rem;
}

.flow-title {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 2rem;
  text-align: center;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

.flow-diagram {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.flow-step {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: 1.2rem 1.3rem;
  background: var(--bg-elevated);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  min-width: 120px;
  transition: all 0.3s;
}

.flow-step:hover {
  border-color: var(--accent);
  box-shadow: 0 0 20px var(--accent-glow);
}

.flow-step.highlight-step {
  border-color: var(--accent);
  background: rgba(45, 212, 191, 0.06);
}

.flow-step-icon { font-size: 1.5rem; margin-bottom: 0.4rem; }
.flow-step-label { font-weight: 600; font-size: 0.85rem; }
.flow-step-sub { font-size: 0.72rem; color: var(--text-muted); margin-top: 0.2rem; }
.flow-arrow { font-size: 1.3rem; color: var(--accent); flex-shrink: 0; }

/* ═══════ TREM STEPS (redesigned) ═══════ */
.trem-steps {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 1rem;
  margin-top: 2.5rem;
}

.trem-step {
  text-align: center;
  padding: 2rem 1rem 1.5rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: all 0.3s;
  position: relative;
}

.trem-step:hover {
  transform: translateY(-3px);
  border-color: var(--accent);
  box-shadow: 0 8px 25px var(--accent-glow);
}

.trem-step-num-label {
  font-family: var(--mono);
  font-size: 2.5rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--accent), var(--cyan));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  opacity: 0.18;
  position: absolute;
  top: 0.5rem;
  right: 0.9rem;
  line-height: 1;
}

.trem-step-icon { 
  font-size: 1.8rem; 
  margin-bottom: 0.8rem;
  display: flex;
  align-items: center;
  justify-content: center;
}

.trem-step h4 { font-size: 0.9rem; font-weight: 600; }

/* ═══════ EXAMPLE SCREENSHOTS ═══════ */
.example-section { margin-top: 3rem; }

.example-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}

.example-header {
  padding: 1.2rem 1.8rem;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.example-header .badge {
  background: rgba(45, 212, 191, 0.1);
  color: var(--accent);
  padding: 4px 14px;
  border-radius: 100px;
  font-size: 0.78rem;
  font-weight: 600;
}

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

.img-placeholder {
  aspect-ratio: 16/10;
  background: var(--bg-elevated);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  font-size: 0.82rem;
  position: relative;
  overflow: hidden;
  border-right: 1px solid var(--border);
}

.img-placeholder:last-child { border-right: none; }

.img-placeholder .img-id {
  font-family: var(--mono);
  font-size: 1.4rem;
  color: var(--accent);
  opacity: 0.5;
  margin-bottom: 0.4rem;
}

/* ═══════ PRODUCTS ═══════ */
.products-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(360px, 1fr));
  gap: 1.5rem;
  margin-top: 1.5rem;
}

.product-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: all 0.4s ease;
  position: relative;
}

.product-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 16px 50px rgba(0,0,0,0.25);
  border-color: var(--border-hover);
}

.product-card.featured { border-color: var(--accent); }

/* ES-Net 併網推薦 red border */
.product-card.net-recommended {
  border-color: var(--red);
}

.product-card.net-recommended::before {
  content: '併網推薦';
  position: absolute;
  top: 1rem;
  left: 1rem;
  background: var(--red);
  color: var(--bg-deep);
  padding: 4px 14px;
  border-radius: 100px;
  font-size: 0.72rem;
  font-weight: 800;
  z-index: 2;
}

.product-card.featured::before {
  content: '即時波形';
  position: absolute;
  top: 1rem;
  right: 1rem;
  background: var(--accent);
  color: var(--bg-deep);
  padding: 4px 14px;
  border-radius: 100px;
  font-size: 0.72rem;
  font-weight: 800;
  z-index: 2;
}

.product-img-area {
  aspect-ratio: 16/9;
  background: var(--bg-elevated);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  font-size: 0.82rem;
  position: relative;
}

.product-img-area::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 50%, var(--bg-card) 100%);
  pointer-events: none;
}

.product-img-area .img-id {
  font-family: var(--mono);
  font-size: 1.8rem;
  color: var(--accent);
  opacity: 0.4;
  margin-bottom: 0.4rem;
  z-index: 1;
}

.product-info { padding: 1.5rem 1.8rem 1.8rem; }

.product-name { font-size: 1.25rem; font-weight: 800; margin-bottom: 0.2rem; }
.product-subtitle { color: var(--text-muted); font-size: 0.82rem; margin-bottom: 1rem; }

.product-specs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.3rem;
}

.spec-tag {
  background: rgba(45, 212, 191, 0.06);
  padding: 5px 14px;
  border-radius: 100px;
  font-size: 0.78rem;
  color: var(--text-secondary);
  border: 1px solid var(--border);
}

.product-price {
  display: flex;
  align-items: baseline;
  gap: 0.3rem;
  margin-bottom: 0.8rem;
}

.product-price .currency { font-size: 0.85rem; color: var(--text-muted); }
.product-price .amount { font-size: 1.9rem; font-weight: 900; color: var(--accent); }
.product-note { color: var(--text-muted); font-size: 0.8rem; padding-top: 0.8rem; border-top: 1px solid var(--border); }

/* Product action buttons */
.product-actions {
  display: flex;
  gap: 0.8rem;
  margin-top: 1.2rem;
}

.btn-product {
  padding: 10px 22px;
  border-radius: 100px;
  font-size: 0.88rem;
  font-weight: 600;
  text-decoration: none;
  transition: all 0.3s ease;
  cursor: pointer;
  font-family: var(--font);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex: 1;
  text-align: center;
}

.btn-product-outline {
  background: transparent;
  color: var(--text-primary);
  border: 1px solid rgba(255,255,255,0.15);
}

.btn-product-outline:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: rgba(45, 212, 191, 0.04);
}

.btn-product-fill {
  background: var(--accent);
  color: var(--bg-deep);
  border: 1px solid var(--accent);
  box-shadow: 0 4px 16px var(--accent-glow);
}

.btn-product-fill:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px var(--accent-glow-strong);
}

/* ═══════ REQUIREMENTS ═══════ */
.req-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.2rem;
  margin-top: 1.5rem;
}

.req-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.8rem;
  position: relative;
  overflow: hidden;
  transition: all 0.3s;
}

.req-card:hover {
  border-color: var(--border-hover);
  transform: translateY(-2px);
}

.req-num {
  position: absolute;
  top: -10px;
  right: 10px;
  font-size: 4.5rem;
  font-weight: 900;
  color: rgba(45, 212, 191, 0.04);
  line-height: 1;
}

.req-card .req-icon { font-size: 1.8rem; margin-bottom: 0.8rem; }
.req-card h3 { font-size: 1.05rem; font-weight: 700; margin-bottom: 0.4rem; }
.req-card p { color: var(--text-secondary); font-size: 0.88rem; }

.req-card .warning {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 0.7rem;
  font-size: 0.78rem;
  color: var(--amber);
  background: rgba(251, 191, 36, 0.06);
  padding: 5px 12px;
  border-radius: 8px;
}

/* ═══════ REGISTRATION ═══════ */
.reg-list { display: grid; gap: 0.8rem; margin-top: 1.5rem; }

.reg-item {
  display: flex;
  align-items: center;
  gap: 1.2rem;
  padding: 1.3rem 1.5rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  transition: all 0.3s;
}

.reg-item:hover { background: var(--bg-card-hover); border-color: var(--border-hover); }

.reg-item-num {
  width: 34px;
  height: 34px;
  border-radius: 10px;
  background: rgba(45, 212, 191, 0.1);
  color: var(--accent);
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-size: 0.85rem;
}

.reg-item-content h4 { font-weight: 600; font-size: 0.95rem; margin-bottom: 0.2rem; }
.reg-item-content p { color: var(--text-secondary); font-size: 0.85rem; }

.privacy-note {
  margin-top: 1.2rem;
  padding: 1rem 1.5rem;
  background: rgba(45, 212, 191, 0.04);
  border: 1px solid rgba(45, 212, 191, 0.12);
  border-radius: var(--radius-sm);
  color: var(--accent);
  font-size: 0.82rem;
  display: flex;
  align-items: center;
  gap: 10px;
}

.reg-form-btn {
  margin-top: 1.5rem;
  display: inline-flex;
}

/* ═══════ PURCHASE PROCESS (redesigned) ═══════ */
.process-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin-top: 2rem;
}

.process-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  transition: all 0.3s;
  position: relative;
  overflow: hidden;
}

.process-card:hover {
  border-color: var(--border-hover);
  transform: translateY(-2px);
}

/* New step label style (no circle) */
.process-step-label {
  font-family: var(--mono);
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 0.0rem;
  opacity: 0.7;
}

.process-card h4 { font-size: 1rem; font-weight: 700; margin-bottom: 0.3rem; }
.process-card p { color: var(--text-secondary); font-size: 0.85rem; }

.process-card .contact-btns {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-top: 0.8rem;
}

.contact-btn {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 6px 14px;
  border-radius: 8px;
  font-size: 0.75rem;
  font-weight: 600;
  text-decoration: none;
  border: 1px solid var(--border);
  color: var(--text-secondary);
  background: rgba(255,255,255,0.02);
  transition: all 0.2s;
}

.contact-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: rgba(45, 212, 191, 0.05);
}

/* Process card as link */
.process-card-link {
  text-decoration: none;
  color: inherit;
  cursor: pointer;
}

.process-card-link:hover {
  border-color: var(--accent);
}

/* Engineer contact section below process grid */
.engineer-contact {
  margin-top: 1.5rem;
  padding: 1.3rem 1.8rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  gap: 1.2rem;
  flex-wrap: wrap;
}

.engineer-contact h4 {
  font-size: 0.95rem;
  font-weight: 700;
  white-space: nowrap;
  display: flex;
  align-items: center;
  gap: 8px;
}

.engineer-contact .contact-btns {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

/* ═══════ CONNECTION STEPS ═══════ */
.conn-steps {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 0.8rem;
  margin-top: 1.5rem;
}

.conn-step {
  text-align: center;
  padding: 1.8rem 0.8rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: all 0.3s;
  position: relative;
}

.conn-step:hover { border-color: var(--accent); background: var(--bg-card-hover); }

.conn-step-num {
  font-family: var(--mono);
  font-size: 2.2rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--accent), var(--cyan));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  opacity: 0.15;
  position: absolute;
  top: 0.4rem;
  right: 0.8rem;
}

.conn-step-icon { 
  font-size: 1.8rem; 
  margin-bottom: 0.6rem;
  display: flex;
  align-items: center;
  justify-content: center;
}
.conn-step h4 { font-size: 0.9rem; font-weight: 600; }
.conn-step p { color: var(--text-muted); font-size: 0.75rem; margin-top: 0.2rem; }

.conn-app-note {
  margin-top: 1.5rem;
  padding: 1.3rem 1.8rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  gap: 1.2rem;
  flex-wrap: wrap;
}

.conn-app-note .app-icon {
  width: 90px;
  height: 90px;
  border-radius: 24px;
  background: linear-gradient(135deg, #1a2a3e, #0f1923);
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  flex-shrink: 0;
  overflow: hidden;
}

.conn-app-note .app-info h4 { font-weight: 700; font-size: 0.95rem; }
.conn-app-note .app-info p { color: var(--text-muted); font-size: 0.82rem; }

.app-badges { display: flex; gap: 0.6rem; margin-top: 0.4rem; }

.app-badge {
  padding: 6px 16px;
  border-radius: 8px;
  font-size: 0.78rem;
  font-weight: 600;
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  text-decoration: none;
  transition: all 0.2s;
}

.app-badge:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* ═══════ INSTALLATION ═══════ */
.install-highlight {
  background: linear-gradient(135deg, rgba(45, 212, 191, 0.05), rgba(34, 211, 238, 0.04));
  border: 1px solid rgba(45, 212, 191, 0.15);
  border-radius: var(--radius);
  padding: 2rem;
  margin-top: 1.5rem;
  text-align: center;
}

.install-highlight h3 { font-size: 1.2rem; font-weight: 800; margin-bottom: 0.4rem; }
.install-highlight p { color: var(--text-secondary); font-size: 0.9rem; }

.install-highlight .key-points {
  display: flex;
  justify-content: center;
  gap: 2rem;
  margin-top: 1.2rem;
  flex-wrap: wrap;
}

.install-highlight .key-point {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 600;
  font-size: 0.95rem;
}

.install-images {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.2rem;
  margin-top: 1.5rem;
}

.install-img-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: all 0.3s ease;
}

.install-img-card:hover {
  border-color: var(--border-hover);
  transform: translateY(-3px);
  box-shadow: 0 12px 40px rgba(0,0,0,0.2);
}

.install-img-wrapper {
  aspect-ratio: 4/3;
  overflow: hidden;
  position: relative;
}

.install-img-wrapper::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 60%, var(--bg-card) 100%);
  pointer-events: none;
}

.install-img-info {
  padding: 1.2rem 1.5rem;
  display: flex;
  align-items: flex-start;
  gap: 1rem;
}

.install-img-icon {
  width: 42px;
  height: 42px;
  border-radius: 12px;
  background: rgba(45, 212, 191, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.install-img-info h4 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 0.3rem;
}

.install-img-info p {
  color: var(--text-secondary);
  font-size: 0.85rem;
  line-height: 1.6;
}

.install-img {
  aspect-ratio: 4/3;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  font-size: 0.82rem;
  transition: all 0.3s;
}

.install-img:hover { border-color: var(--border-hover); }

.install-img .img-id {
  font-family: var(--mono);
  font-size: 1.5rem;
  color: var(--accent);
  opacity: 0.4;
  margin-bottom: 0.4rem;
}

/* ═══════ COMPLETION ═══════ */
.completion-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2.5rem;
  text-align: center;
  margin-top: 1.5rem;
  position: relative;
  overflow: hidden;
}

.completion-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), var(--cyan), var(--blue));
}

.completion-icon { font-size: 3rem; margin-bottom: 0.8rem; }
.completion-card h3 { font-size: 1.3rem; font-weight: 800; margin-bottom: 0.8rem; }
.completion-card > p { color: var(--text-secondary); max-width: 600px; margin: 0 auto; font-size: 0.95rem; }

.completion-img {
  margin-top: 1.5rem;
  aspect-ratio: 16/9;
  background: var(--bg-elevated);
  border-radius: var(--radius-sm);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  font-size: 0.82rem;
  border: 1px solid var(--border);
  overflow: hidden;
}

.completion-img .img-id {
  font-family: var(--mono);
  font-size: 1.5rem;
  color: var(--cyan);
  opacity: 0.4;
  margin-bottom: 0.4rem;
}

/* ═══════ LINKS ═══════ */
.links-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 0.8rem;
  margin-top: 1.5rem;
}

.link-card {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1.1rem 1.3rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  text-decoration: none;
  color: var(--text-primary);
  transition: all 0.3s;
}

.link-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--accent);
  transform: translateY(-2px);
}

.link-icon {
  width: 42px;
  height: 42px;
  border-radius: 11px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  flex-shrink: 0;
  background: rgba(255,255,255,0.03);
}

/* Colorful link card icons */
.link-card:nth-child(1) .link-icon { background: rgba(45, 212, 191, 0.1); }
.link-card:nth-child(1) .link-icon .svg-secondary { filter: brightness(0) saturate(100%) invert(76%) sepia(42%) saturate(588%) hue-rotate(119deg) brightness(92%) contrast(91%); }

.link-card:nth-child(2) .link-icon { background: rgba(114, 137, 218, 0.12); }
.link-card:nth-child(2) .link-icon .svg-secondary { filter: brightness(0) saturate(100%) invert(67%) sepia(55%) saturate(1158%) hue-rotate(202deg) brightness(101%) contrast(96%); }

.link-card:nth-child(3) .link-icon { background: rgba(236, 72, 153, 0.1); }
.link-card:nth-child(3) .link-icon .svg-secondary { filter: brightness(0) saturate(100%) invert(45%) sepia(85%) saturate(2000%) hue-rotate(310deg) brightness(100%) contrast(97%); }

.link-card:nth-child(4) .link-icon { background: rgba(248, 113, 113, 0.1); }
.link-card:nth-child(4) .link-icon .svg-secondary { filter: brightness(0) saturate(100%) invert(55%) sepia(86%) saturate(2000%) hue-rotate(336deg) brightness(100%) contrast(97%); }

.link-card:nth-child(5) .link-icon { background: rgba(139, 157, 195, 0.12); }
.link-card:nth-child(5) .link-icon .svg-secondary { filter: brightness(0) saturate(100%) invert(80%) sepia(5%) saturate(800%) hue-rotate(182deg) brightness(92%) contrast(88%); }

.link-card:nth-child(6) .link-icon { background: rgba(59, 130, 246, 0.1); }
.link-card:nth-child(6) .link-icon .svg-secondary { filter: brightness(0) saturate(100%) invert(43%) sepia(96%) saturate(1352%) hue-rotate(207deg) brightness(101%) contrast(93%); }

.link-card:nth-child(7) .link-icon { background: rgba(52, 211, 153, 0.1); }
.link-card:nth-child(7) .link-icon .svg-secondary { filter: brightness(0) saturate(100%) invert(72%) sepia(38%) saturate(516%) hue-rotate(105deg) brightness(95%) contrast(92%); }

.link-card:nth-child(8) .link-icon { background: rgba(251, 191, 36, 0.1); }
.link-card:nth-child(8) .link-icon .svg-secondary { filter: brightness(0) saturate(100%) invert(76%) sepia(54%) saturate(1034%) hue-rotate(2deg) brightness(104%) contrast(97%); }

.link-card h4 { font-size: 0.9rem; font-weight: 600; }
.link-card p { color: var(--text-muted); font-size: 0.75rem; margin-top: 1px; }

.link-card .link-arrow {
  margin-left: auto;
  color: var(--text-muted);
  transition: all 0.3s;
}

.link-card:hover .link-arrow {
  color: var(--accent);
  transform: translateX(3px);
}

.contact-row {
  display: flex;
  gap: 0.8rem;
  margin-top: 1.5rem;
  flex-wrap: wrap;
}

.contact-tag {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 7px 16px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 100px;
  font-size: 0.82rem;
  color: var(--text-secondary);
}

.contact-tag .platform { font-weight: 600; color: var(--text-primary); }

/* ═══════ FOOTER ═══════ */
footer {
  border-top: 1px solid var(--border);
  padding: 2.5rem 2rem;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.82rem;
}

footer .footer-brand {
  font-size: 1.2rem;
  font-weight: 900;
  color: var(--accent);
  margin-bottom: 0.4rem;
}

/* ═══════ DIVIDER ═══════ */
.section-divider {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
}

.section-divider hr {
  border: none;
  height: 1px;
  background: var(--border);
}

/* ═══════ ANIMATIONS ═══════ */
.fade-in {
  opacity: 0;
  transform: translateY(25px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ═══════ SVG ICON STYLES ═══════ */
.svg-icon {
  width: 24px;
  height: 24px;
  display: block;
}

.svg-icon-inline {
  width: 20px;
  height: 20px;
  display: inline-block;
  vertical-align: middle;
}

.svg-icon-sm {
  width: 18px;
  height: 18px;
  display: inline-block;
  vertical-align: middle;
}

/* SVG color filters */
.svg-teal {
  filter: brightness(0) saturate(100%) invert(76%) sepia(42%) saturate(588%) hue-rotate(119deg) brightness(92%) contrast(91%);
}

.svg-cyan {
  filter: brightness(0) saturate(100%) invert(73%) sepia(68%) saturate(392%) hue-rotate(148deg) brightness(101%) contrast(92%);
}

.svg-blue {
  filter: brightness(0) saturate(100%) invert(43%) sepia(96%) saturate(1352%) hue-rotate(207deg) brightness(101%) contrast(93%);
}

.svg-emerald {
  filter: brightness(0) saturate(100%) invert(72%) sepia(38%) saturate(516%) hue-rotate(105deg) brightness(95%) contrast(92%);
}

.svg-amber {
  filter: brightness(0) saturate(100%) invert(76%) sepia(54%) saturate(1034%) hue-rotate(2deg) brightness(104%) contrast(97%);
}

.svg-indigo {
  filter: brightness(0) saturate(100%) invert(67%) sepia(55%) saturate(1158%) hue-rotate(202deg) brightness(101%) contrast(96%);
}

.svg-accent {
  filter: brightness(0) saturate(100%) invert(76%) sepia(42%) saturate(588%) hue-rotate(119deg) brightness(92%) contrast(91%);
}

.svg-secondary {
  filter: brightness(0) saturate(100%) invert(62%) sepia(12%) saturate(579%) hue-rotate(182deg) brightness(92%) contrast(88%);
}

.svg-dark {
  filter: brightness(0) saturate(100%) invert(5%) sepia(12%) saturate(3000%) hue-rotate(186deg) brightness(97%) contrast(101%);
}

/* ═══════ YOUTUBE CONTAINER ═══════ */
.youtube-container {
  position: relative;
  padding-bottom: 56.25%;
  height: 0;
  overflow: hidden;
  background: var(--bg-elevated);
}

.youtube-container iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: none;
}

/* ═══════ APP STORE BADGE IMAGES ═══════ */
.app-badge-img {
  display: inline-flex;
  align-items: center;
  text-decoration: none;
  transition: all 0.2s;
}

.app-badge-img:hover {
  opacity: 0.8;
  transform: translateY(-1px);
}

.store-badge-img {
  height: 32px;
  width: auto;
  display: block;
}

/* ═══════ APP LOGO IMAGE ═══════ */
.app-logo-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 14px;
}

/* ═══════ RED/ORANGE SVG FILTERS ═══════ */
.svg-red {
  filter: brightness(0) saturate(100%) invert(55%) sepia(86%) saturate(2000%) hue-rotate(336deg) brightness(100%) contrast(97%);
}

.svg-orange {
  filter: brightness(0) saturate(100%) invert(60%) sepia(90%) saturate(700%) hue-rotate(360deg) brightness(100%) contrast(95%);
}

/* ═══════ FLOW HIGHLIGHT RED ═══════ */
.flow-step.highlight-step-red {
  border-color: var(--red);
  background: rgba(248, 113, 113, 0.06);
}

.flow-step.highlight-step-red:hover {
  box-shadow: 0 0 20px rgba(248, 113, 113, 0.2);
}

/* ═══════ TREM STEP COLORS ═══════ */
.trem-step-blue { border-bottom: 2px solid rgba(59, 130, 246, 0.4); }
.trem-step-blue .trem-step-num-label { color: var(--blue); -webkit-text-fill-color: var(--blue); background: none; }

.trem-step-emerald { border-bottom: 2px solid rgba(52, 211, 153, 0.4); }
.trem-step-emerald .trem-step-num-label { color: var(--emerald); -webkit-text-fill-color: var(--emerald); background: none; }

.trem-step-amber { border-bottom: 2px solid rgba(251, 191, 36, 0.4); }
.trem-step-amber .trem-step-num-label { color: var(--amber); -webkit-text-fill-color: var(--amber); background: none; }

.trem-step-orange { border-bottom: 2px solid rgba(251, 146, 60, 0.4); }
.trem-step-orange .trem-step-num-label { color: #fb923c; -webkit-text-fill-color: #fb923c; background: none; }

.trem-step-red { border-bottom: 2px solid rgba(248, 113, 113, 0.4); }
.trem-step-red .trem-step-num-label { color: var(--red); -webkit-text-fill-color: var(--red); background: none; }

/* ═══════ YOUTUBE THUMBNAIL LINK ═══════ */
.yt-link {
  display: block;
  position: absolute;
  inset: 0;
  text-decoration: none;
}

.yt-thumb-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.yt-play-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  background: rgba(0, 0, 0, 0.35);
  transition: background 0.3s;
}

.yt-link:hover .yt-play-overlay {
  background: rgba(0, 0, 0, 0.5);
}

.yt-play-overlay svg {
  filter: drop-shadow(0 4px 12px rgba(0,0,0,0.5));
  transition: transform 0.2s;
}

.yt-link:hover .yt-play-overlay svg {
  transform: scale(1.15);
}

.yt-link-text {
  color: #fff;
  font-size: 0.85rem;
  font-weight: 600;
  text-shadow: 0 2px 8px rgba(0,0,0,0.6);
}

/* ═══════ DPIP SECTION ═══════ */
.dpip-hero {
  background: linear-gradient(145deg, rgba(45, 212, 191, 0.04) 0%, var(--bg-card) 30%, rgba(251, 191, 36, 0.03) 100%);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2.5rem;
}

.dpip-hero-left {
  display: flex;
  align-items: center;
  gap: 1.2rem;
  margin-bottom: 1.2rem;
}

.dpip-app-icon {
  width: 90px;
  height: 90px;
  border-radius: 24px;
  overflow: hidden;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  flex-shrink: 0;
}

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

.dpip-badge {
  display: inline-flex;
  align-items: center;
  background: rgba(45, 212, 191, 0.08);
  border: 1px solid rgba(45, 212, 191, 0.2);
  padding: 4px 12px;
  border-radius: 100px;
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--accent);
  margin-bottom: 0.1rem;
}

.dpip-title {
  font-size: 1.5rem;
  font-weight: 900;
  margin: 0;
  line-height: 1.3;
}

.dpip-desc {
  color: var(--text-secondary);
  font-size: 0.92rem;
  max-width: 700px;
  margin-bottom: 1rem;
  line-height: 1.7;
}

.dpip-bottom-row {
  display: flex;
  align-items: center;
  gap: 1.2rem;
  flex-wrap: wrap;
}

.dpip-bottom-row .app-badges {
  margin-top: 0;
}

.dpip-features {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.dpip-feat {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border-radius: 100px;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-secondary);
  background: rgba(255,255,255,0.03);
  border: 1px solid var(--border);
}

/* ═══════ ORIGINAL PRICE STRIKETHROUGH ═══════ */
.original-price {
  font-size: 0.85rem;
  color: var(--text-muted);
  text-decoration: line-through;
  text-decoration-color: var(--red);
  text-align: right;
  margin-top: -0.4rem;
  margin-bottom: 0.8rem;
  opacity: 0.6;
}

/* ═══════ PROCESS CARD COLORS ═══════ */
.process-card-purple {
  border-bottom: 2px solid rgba(59, 130, 246, 0.4);
  background: linear-gradient(145deg, rgba(59, 130, 246, 0.04) 0%, var(--bg-card) 50%);
}
.process-card-purple .process-step-label { color: var(--blue); }

.process-card-blue {
  border-bottom: 2px solid rgba(34, 211, 238, 0.4);
  background: linear-gradient(145deg, rgba(34, 211, 238, 0.04) 0%, var(--bg-card) 50%);
}
.process-card-blue .process-step-label { color: var(--cyan); }

.process-card-green {
  border-bottom: 2px solid rgba(52, 211, 153, 0.4);
  background: linear-gradient(145deg, rgba(52, 211, 153, 0.04) 0%, var(--bg-card) 50%);
}
.process-card-green .process-step-label { color: var(--emerald); }

.process-card-yellow {
  border-bottom: 2px solid rgba(251, 191, 36, 0.4);
  background: linear-gradient(145deg, rgba(251, 191, 36, 0.03) 0%, var(--bg-card) 50%);
}
.process-card-yellow .process-step-label { color: var(--amber); }

.process-card-orange {
  border-bottom: 2px solid rgba(251, 146, 60, 0.4);
  background: linear-gradient(145deg, rgba(251, 146, 60, 0.04) 0%, var(--bg-card) 50%);
}
.process-card-orange .process-step-label { color: #fb923c; }

.process-card-red {
  border-bottom: 2px solid rgba(248, 113, 113, 0.4);
  background: linear-gradient(145deg, rgba(248, 113, 113, 0.04) 0%, var(--bg-card) 50%);
}
.process-card-red .process-step-label { color: var(--red); }

/* ═══════ REGISTRATION ITEM COLORS ═══════ */
.reg-item-lightgreen { border-left: 3px solid rgba(45, 212, 191, 0.5); }
.reg-num-lightgreen { background: rgba(45, 212, 191, 0.1); color: #2dd4bf; }

.reg-item-lightblue { border-left: 3px solid rgba(96, 165, 250, 0.5); }
.reg-num-lightblue { background: rgba(96, 165, 250, 0.1); color: #60a5fa; }

.reg-item-deepblue { border-left: 3px solid rgba(129, 140, 248, 0.5); }
.reg-num-deepblue { background: rgba(129, 140, 248, 0.1); color: #818cf8; }

.reg-item-purple { border-left: 3px solid rgba(168, 85, 247, 0.5); }
.reg-num-purple { background: rgba(168, 85, 247, 0.1); color: #a855f7; }

/* ═══════ RESPONSIVE ═══════ */
@media (max-width: 900px) {
  .purpose-grid { grid-template-columns: repeat(2, 1fr); }
  .trem-steps { grid-template-columns: repeat(2, 1fr); }
  .trem-steps .trem-step:last-child { grid-column: 1 / -1; }
  .conn-steps { grid-template-columns: repeat(2, 1fr); }
  .conn-steps .conn-step:last-child { grid-column: 1 / -1; }
  .process-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .purpose-grid { grid-template-columns: 1fr; }
  .example-body { grid-template-columns: 1fr; }
  .img-placeholder { border-right: none; border-bottom: 1px solid var(--border); }
  .img-placeholder:last-child { border-bottom: none; }
  .products-grid { grid-template-columns: 1fr; }
  .install-images { grid-template-columns: 1fr; }
  .flow-diagram { flex-direction: column; }
  .flow-arrow { transform: rotate(90deg); }
  .trem-steps { grid-template-columns: 1fr; }
  .trem-steps .trem-step:last-child { grid-column: auto; }
  .conn-steps { grid-template-columns: 1fr; }
  .conn-steps .conn-step:last-child { grid-column: auto; }
  .process-grid { grid-template-columns: 1fr; }
  .dpip-hero { flex-direction: column; }
  .dpip-hero-phone { width: 100%; margin: 0; max-height: 250px; }
}