/* ==========================================================================
   TECMAX VIDEO STUDIO - INSTALLATION & GUIDE WEBSITE
   ========================================================================== */

:root {
  --bg-primary: #0a0e17;
  --bg-secondary: #0f1524;
  --bg-card: rgba(18, 26, 44, 0.72);
  --bg-card-hover: rgba(26, 38, 64, 0.85);
  --bg-glass: rgba(255, 255, 255, 0.03);
  --bg-surface: rgba(255, 255, 255, 0.05);

  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-highlight: rgba(99, 102, 241, 0.4);

  --primary: #6366f1;
  --primary-hover: #4f46e5;
  --primary-glow: rgba(99, 102, 241, 0.35);

  --accent-cyan: #06b6d4;
  --accent-cyan-glow: rgba(6, 182, 212, 0.25);
  --accent-purple: #a855f7;
  --accent-green: #10b981;
  --accent-amber: #f59e0b;

  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-dim: #64748b;

  --font-sans: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;

  --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.3);
  --shadow-card: 0 16px 36px -12px rgba(0, 0, 0, 0.55);
  --shadow-glow: 0 0 35px var(--primary-glow);

  --transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-main);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  position: relative;
  overflow-x: hidden;
  min-height: 100vh;
}

/* Ambient Backdrops */
.ambient-glow {
  position: fixed;
  border-radius: 50%;
  filter: blur(140px);
  pointer-events: none;
  z-index: 0;
  opacity: 0.6;
}

.glow-1 {
  width: 550px;
  height: 550px;
  background: radial-gradient(circle, rgba(99, 102, 241, 0.22), transparent 70%);
  top: -100px;
  left: 10%;
}

.glow-2 {
  width: 650px;
  height: 650px;
  background: radial-gradient(circle, rgba(168, 85, 247, 0.16), transparent 70%);
  top: 35%;
  right: -100px;
}

.glow-3 {
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(6, 182, 212, 0.18), transparent 70%);
  bottom: 5%;
  left: 5%;
}

/* Layout Container */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 1;
}

/* Typography Utilities */
.gradient-text {
  background: linear-gradient(135deg, #a5b4fc 0%, #818cf8 40%, #c084fc 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
}

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

.text-link {
  color: #818cf8;
  text-decoration: underline;
  text-underline-offset: 4px;
  transition: var(--transition);
}

.text-link:hover {
  color: #c7d2fe;
}

/* Header & Nav */
.site-header {
  position: sticky;
  top: 0;
  width: 100%;
  background: rgba(10, 14, 23, 0.82);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border-bottom: 1px solid var(--border-subtle);
  z-index: 100;
  padding: 16px 0;
  transition: var(--transition);
}

.header-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--text-main);
  transition: var(--transition);
}

.brand-icon {
  width: 38px;
  height: 38px;
  border-radius: 10px;
  object-fit: cover;
  box-shadow: 0 4px 14px rgba(99, 102, 241, 0.3);
}

.brand-title {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
}

.nav-link {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
  transition: var(--transition);
}

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

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 12px 24px;
  border-radius: var(--radius-md);
  font-family: var(--font-sans);
  font-size: 0.95rem;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  border: 1px solid transparent;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.btn-sm {
  padding: 8px 16px;
  font-size: 0.88rem;
  border-radius: var(--radius-sm);
}

.btn-lg {
  padding: 16px 32px;
  font-size: 1.05rem;
  border-radius: var(--radius-md);
}

.btn-primary {
  background: linear-gradient(135deg, #6366f1 0%, #4f46e5 100%);
  color: #ffffff;
  box-shadow: 0 6px 20px -2px rgba(99, 102, 241, 0.45);
}

.btn-primary:hover {
  transform: translateY(-2px);
  background: linear-gradient(135deg, #7073ff 0%, #574ee8 100%);
  box-shadow: 0 10px 28px -4px rgba(99, 102, 241, 0.6);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-main);
  border: 1px solid var(--border-subtle);
  backdrop-filter: blur(10px);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.09);
  border-color: rgba(255, 255, 255, 0.2);
  transform: translateY(-2px);
}

/* Download Main Button Style */
.download-main-btn {
  display: inline-flex;
  align-items: center;
  gap: 16px;
  padding: 14px 28px;
}

.btn-icon-box {
  background: rgba(255, 255, 255, 0.18);
  width: 44px;
  height: 44px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.btn-text-group {
  display: flex;
  flex-direction: column;
  text-align: left;
}

.btn-label-primary {
  font-size: 1.08rem;
  font-weight: 700;
  line-height: 1.25;
}

.btn-label-secondary {
  font-size: 0.8rem;
  font-weight: 500;
  opacity: 0.85;
}

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

.hero-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  max-width: 900px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  background: rgba(99, 102, 241, 0.12);
  border: 1px solid rgba(99, 102, 241, 0.28);
  border-radius: 100px;
  font-size: 0.85rem;
  font-weight: 600;
  color: #c7d2fe;
  margin-bottom: 24px;
}

.badge-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #34d399;
  box-shadow: 0 0 10px #34d399;
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0% { transform: scale(0.95); opacity: 0.8; }
  50% { transform: scale(1.2); opacity: 1; }
  100% { transform: scale(0.95); opacity: 0.8; }
}

.hero-title {
  font-size: 3.25rem;
  line-height: 1.15;
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 22px;
}

.hero-subtitle {
  font-size: 1.18rem;
  color: var(--text-muted);
  max-width: 760px;
  margin-bottom: 38px;
  line-height: 1.65;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  justify-content: center;
  margin-bottom: 48px;
}

.features-grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 14px;
}

.feature-pill {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 8px 18px;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: 100px;
  font-size: 0.9rem;
  color: var(--text-main);
  box-shadow: var(--shadow-sm);
}

/* Sections Global */
.section {
  padding: 75px 0;
}

.section-header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 50px;
}

.section-tag {
  display: inline-block;
  padding: 4px 14px;
  background: rgba(99, 102, 241, 0.12);
  border: 1px solid rgba(99, 102, 241, 0.25);
  border-radius: 100px;
  font-size: 0.82rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: #a5b4fc;
  margin-bottom: 14px;
}

.badge-cyan {
  background: rgba(6, 182, 212, 0.12);
  border-color: rgba(6, 182, 212, 0.3);
  color: #67e8f9;
}

.badge-green {
  background: rgba(16, 185, 129, 0.12);
  border-color: rgba(16, 185, 129, 0.3);
  color: #6ee7b7;
}

.section-title {
  font-size: 2.3rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 14px;
}

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

/* Requirements Grid */
.requirements-cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 22px;
}

.req-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 28px;
  backdrop-filter: blur(12px);
  transition: var(--transition);
  position: relative;
  display: flex;
  flex-direction: column;
}

.req-card:hover {
  transform: translateY(-4px);
  background: var(--bg-card-hover);
  border-color: rgba(255, 255, 255, 0.14);
  box-shadow: var(--shadow-card);
}

.highlight-card {
  border-color: rgba(99, 102, 241, 0.35);
  background: linear-gradient(145deg, rgba(18, 26, 44, 0.85) 0%, rgba(30, 27, 75, 0.45) 100%);
}

.req-icon-box {
  width: 54px;
  height: 54px;
  border-radius: 14px;
  background: rgba(99, 102, 241, 0.12);
  color: #818cf8;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
}

.req-title {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 6px;
}

.req-value {
  font-size: 1rem;
  font-weight: 600;
  color: #38bdf8;
  margin-bottom: 16px;
}

.req-details {
  list-style: none;
  font-size: 0.9rem;
  color: var(--text-muted);
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.req-details li {
  position: relative;
  padding-left: 18px;
}

.req-details li::before {
  content: '•';
  position: absolute;
  left: 0;
  color: #6366f1;
  font-weight: bold;
}

/* Quick Access Banner */
.quick-link-banner {
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.14) 0%, rgba(6, 182, 212, 0.1) 100%);
  border: 1px solid rgba(99, 102, 241, 0.3);
  border-radius: var(--radius-lg);
  padding: 22px 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 50px;
  flex-wrap: wrap;
}

.banner-content {
  display: flex;
  align-items: center;
  gap: 16px;
}

.banner-icon {
  width: 46px;
  height: 46px;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.08);
  display: flex;
  align-items: center;
  justify-content: center;
}

.banner-title {
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-bottom: 2px;
}

.banner-code {
  font-family: var(--font-mono);
  font-size: 1.05rem;
  color: #a5b4fc;
  font-weight: 600;
}

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

/* Timeline Steps */
.steps-timeline {
  display: flex;
  flex-direction: column;
  gap: 30px;
  position: relative;
  max-width: 860px;
  margin: 0 auto;
}

.steps-timeline::before {
  content: '';
  position: absolute;
  top: 30px;
  bottom: 30px;
  left: 24px;
  width: 2px;
  background: linear-gradient(to bottom, #6366f1, #06b6d4, #10b981);
  z-index: 1;
}

.timeline-step {
  display: flex;
  gap: 28px;
  position: relative;
  z-index: 2;
}

.step-marker {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background: var(--bg-secondary);
  border: 2px solid #6366f1;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 1.15rem;
  color: #ffffff;
  box-shadow: 0 0 16px rgba(99, 102, 241, 0.4);
  flex-shrink: 0;
  transition: var(--transition);
}

.active-marker {
  border-color: #10b981;
  box-shadow: 0 0 18px rgba(16, 185, 129, 0.4);
}

.step-card {
  flex: 1;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 28px;
  backdrop-filter: blur(12px);
  transition: var(--transition);
}

.step-card:hover {
  border-color: rgba(255, 255, 255, 0.16);
  background: var(--bg-card-hover);
  box-shadow: var(--shadow-card);
}

.step-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
  flex-wrap: wrap;
}

.step-tag {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 3px 10px;
  border-radius: 6px;
  background: rgba(99, 102, 241, 0.15);
  color: #a5b4fc;
}

.step-heading {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-main);
}

.step-desc {
  color: var(--text-muted);
  font-size: 0.98rem;
  line-height: 1.6;
  margin-bottom: 18px;
}

.step-note {
  font-size: 0.88rem;
  color: var(--text-dim);
  margin-top: 10px;
}

.tip-box, .warning-box {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 18px;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  line-height: 1.45;
}

.tip-box {
  background: rgba(6, 182, 212, 0.08);
  border: 1px solid rgba(6, 182, 212, 0.22);
  color: #a5f3fc;
}

.warning-box {
  background: rgba(245, 158, 11, 0.08);
  border: 1px solid rgba(245, 158, 11, 0.22);
  color: #fde68a;
  margin-top: 14px;
}

.mock-button-preview {
  display: flex;
  align-items: center;
  gap: 14px;
  margin: 14px 0;
  flex-wrap: wrap;
}

.mock-blue-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: #1a73e8;
  color: #ffffff;
  padding: 9px 18px;
  border-radius: 6px;
  font-weight: 600;
  font-size: 0.92rem;
  box-shadow: 0 2px 8px rgba(26, 115, 232, 0.35);
}

.preview-subtext {
  font-size: 0.85rem;
  color: var(--text-dim);
}

.modal-mock {
  background: rgba(0, 0, 0, 0.35);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-sm);
  padding: 14px 18px;
  margin: 12px 0;
}

.modal-mock-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.95rem;
}

.radio-circle {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  border: 4px solid #1a73e8;
  background: #ffffff;
}

.item-hint {
  font-size: 0.85rem;
  color: var(--text-dim);
}

.key-preview-box {
  background: #090d15;
  border: 1px dashed rgba(255, 255, 255, 0.16);
  border-radius: var(--radius-sm);
  padding: 14px 18px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  font-family: var(--font-mono);
  font-size: 0.95rem;
}

.key-mock-text {
  color: #34d399;
}

.badge-secure {
  font-size: 0.75rem;
  background: rgba(52, 211, 153, 0.12);
  color: #34d399;
  padding: 2px 8px;
  border-radius: 4px;
  font-family: var(--font-sans);
  font-weight: 600;
}

.app-config-steps {
  list-style: none;
  counter-reset: app-counter;
  display: flex;
  flex-direction: column;
  gap: 10px;
  font-size: 0.95rem;
  color: var(--text-main);
}

.app-config-steps li {
  counter-increment: app-counter;
  position: relative;
  padding-left: 28px;
  line-height: 1.5;
}

.app-config-steps li::before {
  content: counter(app-counter);
  position: absolute;
  left: 0;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: rgba(99, 102, 241, 0.2);
  color: #a5b4fc;
  font-size: 0.75rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
}

.mini-dot {
  display: inline-block;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #10b981;
  margin-right: 4px;
}

/* Install Guide Section */
.install-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 22px;
}

.install-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 28px;
  position: relative;
  transition: var(--transition);
}

.install-card:hover {
  transform: translateY(-4px);
  background: var(--bg-card-hover);
  border-color: rgba(255, 255, 255, 0.15);
  box-shadow: var(--shadow-card);
}

.card-step-num {
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  color: #818cf8;
  letter-spacing: 0.05em;
  margin-bottom: 12px;
}

.install-card h3 {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 10px;
}

.install-card p {
  font-size: 0.92rem;
  color: var(--text-muted);
  line-height: 1.6;
}

.install-card code {
  font-family: var(--font-mono);
  background: rgba(255, 255, 255, 0.08);
  padding: 2px 6px;
  border-radius: 4px;
  color: #c7d2fe;
}

.smartscreen-box {
  background: rgba(0, 120, 215, 0.12);
  border: 1px solid rgba(0, 120, 215, 0.3);
  border-radius: var(--radius-sm);
  padding: 12px;
  margin-top: 12px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 0.85rem;
}

.smartscreen-link {
  color: #93c5fd;
}

.smartscreen-btn {
  color: #bfdbfe;
}

/* FAQ Accordion */
.faq-container {
  max-width: 820px;
}

.accordion {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: var(--transition);
}

.faq-item:hover {
  border-color: rgba(255, 255, 255, 0.14);
}

.faq-question {
  width: 100%;
  padding: 20px 24px;
  background: none;
  border: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  font-family: var(--font-sans);
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-main);
  text-align: left;
  cursor: pointer;
  transition: var(--transition);
}

.faq-question:hover {
  color: #a5b4fc;
}

.faq-chevron {
  width: 10px;
  height: 10px;
  border-right: 2px solid var(--text-muted);
  border-bottom: 2px solid var(--text-muted);
  transform: rotate(45deg);
  transition: transform 0.3s ease;
  flex-shrink: 0;
}

.faq-item.active .faq-chevron {
  transform: rotate(-135deg);
  border-color: #818cf8;
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s cubic-bezier(0.16, 1, 0.3, 1), padding 0.3s ease;
  padding: 0 24px;
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.65;
}

.faq-item.active .faq-answer {
  padding-bottom: 22px;
}

/* CTA Banner */
.cta-section {
  padding: 60px 0 90px;
}

.cta-card {
  background: linear-gradient(135deg, rgba(30, 27, 75, 0.8) 0%, rgba(15, 23, 42, 0.9) 100%);
  border: 1px solid rgba(99, 102, 241, 0.35);
  border-radius: var(--radius-xl);
  padding: 60px 40px;
  text-align: center;
  box-shadow: 0 20px 45px -15px rgba(0, 0, 0, 0.6);
  position: relative;
  overflow: hidden;
}

.cta-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, #6366f1, #06b6d4, transparent);
}

.cta-title {
  font-size: 2.2rem;
  font-weight: 800;
  margin-bottom: 12px;
  letter-spacing: -0.02em;
}

.cta-subtitle {
  font-size: 1.1rem;
  color: var(--text-muted);
  margin-bottom: 34px;
}

.cta-buttons {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--border-subtle);
  background: rgba(10, 14, 23, 0.95);
  padding: 34px 0;
  font-size: 0.88rem;
  color: var(--text-dim);
}

.footer-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text-muted);
}

.footer-logo {
  width: 24px;
  height: 24px;
  border-radius: 6px;
}

/* ==========================================================================
   UI MOCKUPS FOR STEP-BY-STEP TUTORIAL
   ========================================================================== */

.ui-mock-box {
  background: rgba(10, 14, 23, 0.7);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-md);
  padding: 16px;
  margin: 16px 0;
  width: 100%;
  box-sizing: border-box;
}

.ui-mock-hint {
  font-size: 0.82rem;
  font-weight: 600;
  color: #38bdf8;
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 6px;
}

/* Sidebar preview (Step 2) */
.ui-sidebar-preview {
  background: #111827;
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-sm);
  padding: 14px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  max-width: 380px;
}

.ui-sidebar-nav-muted {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--text-dim);
  padding: 6px 10px;
}

.ui-dot-dim {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--text-dim);
  opacity: 0.5;
}

.ui-sidebar-target {
  background: rgba(99, 102, 241, 0.12);
  border: 2px dashed #6366f1;
  border-radius: var(--radius-sm);
  padding: 10px 12px;
  position: relative;
}

.ui-badge-pointer {
  display: inline-block;
  background: #6366f1;
  color: #ffffff;
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.05em;
  padding: 2px 8px;
  border-radius: 4px;
  margin-bottom: 6px;
  box-shadow: 0 2px 8px rgba(99, 102, 241, 0.5);
}

.ui-key-item {
  display: flex;
  align-items: center;
  gap: 10px;
  color: #ffffff;
  font-size: 0.95rem;
}

.ui-target-tag {
  margin-left: auto;
  font-size: 0.72rem;
  background: rgba(99, 102, 241, 0.25);
  color: #a5b4fc;
  padding: 2px 8px;
  border-radius: 4px;
  font-weight: 600;
}

.ui-sidebar-user {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 10px;
  background: rgba(255, 255, 255, 0.03);
  border-radius: 6px;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
}

.ui-user-icon {
  font-size: 1.2rem;
}

.ui-user-details {
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.ui-user-email {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-main);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.ui-user-note {
  font-size: 0.75rem;
  color: var(--text-dim);
}

/* Topbar preview (Step 3) */
.ui-topbar-preview {
  background: #111827;
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-sm);
  padding: 14px 18px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.ui-page-label {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-main);
}

.ui-blue-action-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: #1a73e8;
  color: #ffffff;
  padding: 10px 18px;
  border-radius: 6px;
  font-size: 0.92rem;
  font-weight: 700;
  box-shadow: 0 4px 14px rgba(26, 115, 232, 0.45);
  animation: pulse-border 2.5s infinite ease-in-out;
}

.ui-btn-en {
  font-size: 0.8rem;
  opacity: 0.85;
  font-weight: 500;
}

@keyframes pulse-border {
  0%, 100% {
    transform: scale(1);
    box-shadow: 0 4px 14px rgba(26, 115, 232, 0.45);
  }
  50% {
    transform: scale(1.02);
    box-shadow: 0 6px 20px rgba(26, 115, 232, 0.7);
  }
}

/* Popup preview (Step 4) */
.ui-popup-preview {
  background: #1e293b;
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: var(--radius-sm);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.6);
  overflow: hidden;
  max-width: 500px;
}

.ui-popup-header {
  padding: 14px 18px;
  background: rgba(0, 0, 0, 0.2);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.ui-popup-title {
  font-size: 0.98rem;
  font-weight: 700;
  color: #ffffff;
}

.ui-popup-body {
  padding: 16px 18px;
}

.ui-radio-row {
  display: flex;
  align-items: flex-start;
  gap: 12px;
}

.ui-radio-checked {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  border: 5px solid #1a73e8;
  background: #ffffff;
  flex-shrink: 0;
  margin-top: 2px;
}

.ui-radio-labels {
  display: flex;
  flex-direction: column;
  gap: 4px;
  font-size: 0.92rem;
  color: var(--text-main);
}

.ui-radio-sub {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.ui-popup-footer {
  padding: 14px 18px;
  background: rgba(0, 0, 0, 0.15);
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}

.ui-popup-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: #1a73e8;
  color: #ffffff;
  padding: 8px 16px;
  border-radius: 6px;
  font-size: 0.9rem;
  font-weight: 700;
}

/* ==========================================================================
   ENHANCED MOBILE RESPONSIVENESS (SMARTPHONES & TABLETS)
   ========================================================================== */

@media (max-width: 900px) {
  .hero-title {
    font-size: 2.3rem;
  }
  .nav-links {
    display: none;
  }
  .steps-timeline::before {
    left: 20px;
  }
  .step-marker {
    width: 42px;
    height: 42px;
    font-size: 1rem;
  }
  .timeline-step {
    gap: 16px;
  }
}

@media (max-width: 680px) {
  html {
    scroll-padding-top: 70px;
  }

  body {
    font-size: 15px;
  }

  .container {
    padding: 0 16px;
  }

  .site-header {
    padding: 12px 0;
  }

  .brand-icon {
    width: 32px;
    height: 32px;
  }

  .brand-title {
    font-size: 1.05rem;
  }

  .header-cta {
    padding: 6px 12px;
    font-size: 0.8rem;
    gap: 6px;
  }

  .header-cta svg {
    width: 15px;
    height: 15px;
  }

  /* Hero Section */
  .hero-section {
    padding: 40px 0 30px;
  }

  .hero-badge {
    font-size: 0.78rem;
    padding: 5px 12px;
    max-width: 100%;
    white-space: normal;
    text-align: center;
  }

  .hero-title {
    font-size: 1.85rem;
    line-height: 1.25;
    margin-bottom: 14px;
  }

  .hero-subtitle {
    font-size: 0.95rem;
    line-height: 1.55;
    margin-bottom: 24px;
  }

  .hero-actions {
    flex-direction: column;
    width: 100%;
    gap: 12px;
  }

  .download-main-btn {
    width: 100%;
    padding: 14px 16px;
    justify-content: flex-start;
  }

  .btn-icon-box {
    width: 38px;
    height: 38px;
    min-width: 38px;
  }

  .btn-label-primary {
    font-size: 0.98rem;
  }

  .btn-label-secondary {
    font-size: 0.75rem;
  }

  .btn-lg {
    width: 100%;
    justify-content: center;
    padding: 14px 20px;
    font-size: 0.95rem;
  }

  .features-grid {
    flex-direction: column;
    width: 100%;
    gap: 8px;
    margin-top: 26px;
  }

  .feature-pill {
    width: 100%;
    justify-content: center;
    font-size: 0.82rem;
    padding: 8px 12px;
  }

  /* Section headers */
  .section {
    padding: 45px 0;
  }

  .section-tag {
    font-size: 0.75rem;
  }

  .section-title {
    font-size: 1.55rem;
    line-height: 1.25;
  }

  .section-subtitle {
    font-size: 0.92rem;
  }

  /* Requirements & Install Grid */
  .requirements-cards-grid,
  .install-grid {
    grid-template-columns: 1fr;
    gap: 14px;
  }

  .req-card,
  .install-card {
    padding: 20px 16px;
  }

  /* Quick link banner */
  .quick-link-banner {
    flex-direction: column;
    align-items: stretch;
    padding: 16px;
    gap: 14px;
    margin-bottom: 30px;
  }

  .banner-content {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
  }

  .banner-code {
    font-size: 0.85rem;
    word-break: break-all;
    width: 100%;
    background: rgba(0, 0, 0, 0.35);
    padding: 8px 10px;
    border-radius: 6px;
    display: block;
    box-sizing: border-box;
  }

  .banner-actions {
    width: 100%;
    flex-direction: column;
    gap: 8px;
  }

  .banner-actions .btn {
    width: 100%;
    justify-content: center;
  }

  /* Steps Timeline */
  .steps-timeline::before {
    left: 17px;
  }

  .timeline-step {
    gap: 12px;
  }

  .step-marker {
    width: 36px;
    height: 36px;
    min-width: 36px;
    font-size: 0.95rem;
  }

  .step-card {
    padding: 18px 14px;
    width: calc(100% - 48px);
    border-radius: var(--radius-md);
  }

  .step-heading {
    font-size: 1.1rem;
    line-height: 1.35;
  }

  .step-desc {
    font-size: 0.92rem;
    line-height: 1.5;
    margin-bottom: 14px;
  }

  /* UI mock previews inside steps */
  .ui-mock-box {
    padding: 12px;
  }

  .ui-sidebar-preview,
  .ui-popup-preview {
    max-width: 100%;
  }

  .ui-topbar-preview {
    flex-direction: column;
    align-items: stretch;
    gap: 10px;
  }

  .ui-blue-action-btn,
  .ui-popup-btn {
    width: 100%;
    justify-content: center;
    box-sizing: border-box;
  }

  .ui-popup-footer {
    flex-direction: column;
    align-items: stretch;
  }

  .key-preview-box {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
    padding: 12px;
  }

  .key-mock-text {
    word-break: break-all;
    font-size: 0.8rem;
  }

  .tip-box, .warning-box {
    padding: 10px 12px;
    font-size: 0.84rem;
  }

  .app-config-steps {
    padding-left: 18px;
    font-size: 0.9rem;
    display: flex;
    flex-direction: column;
    gap: 8px;
  }

  /* FAQ Accordion */
  .faq-question {
    padding: 16px 14px;
    font-size: 0.95rem;
    gap: 12px;
  }

  .faq-answer {
    padding: 0 14px;
    font-size: 0.88rem;
  }

  .faq-item.active .faq-answer {
    padding-bottom: 16px;
  }

  /* CTA Section */
  .cta-section {
    padding: 40px 0 60px;
  }

  .cta-card {
    padding: 32px 16px;
    border-radius: var(--radius-lg);
  }

  .cta-title {
    font-size: 1.45rem;
  }

  .cta-subtitle {
    font-size: 0.92rem;
    margin-bottom: 24px;
  }

  .cta-buttons {
    flex-direction: column;
    width: 100%;
    gap: 10px;
  }

  .cta-buttons .btn {
    width: 100%;
  }

  /* Footer */
  .site-footer {
    padding: 24px 0;
  }

  .footer-container {
    flex-direction: column;
    text-align: center;
    gap: 12px;
  }

  .footer-brand {
    justify-content: center;
  }
}

@media (max-width: 380px) {
  .brand-title {
    font-size: 0.95rem;
  }
  .hero-title {
    font-size: 1.65rem;
  }
  .step-heading {
    font-size: 1rem;
  }
}