:root {
  --y: #FFD000;
  --o: #FF6200;
  --r: #E8001D;
  --dark: #08090D;
  --dark2: #101318;
  --dark3: #181D27;
  --panel: #1E2433;
  --border: rgba(255,255,255,0.07);
  --text: #E8EBF4;
  --dim: #ddd;
  --teal: #00CFC0;
  --blue: #1A5FFF;
}
*, *::before, *::after { margin:0; padding:0; box-sizing:border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: 'Noto Sans TC', sans-serif;
  background: var(--dark);
  color: var(--text);
  overflow-x: hidden;
}
a { text-decoration: none; color: inherit; }

::-webkit-scrollbar { width: 4px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.1); border-radius: 2px; }

/* ─── NAV ─── */
nav {
  position: fixed; top:0; left:0; right:0; z-index:99999;
  height: 64px;
  display: flex; align-items: center; justify-content: center;
  padding: 0 40px;
  background: rgba(255,255,255,0.97);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(0,0,0,0.08);
}
.nav-inner {
  display: flex; align-items: center; justify-content: space-between;
  width: 100%; max-width: 1200px;
}
.nav-logo { display: flex; align-items: center; gap: 12px; }
.nav-logo img { height: 28px; }
.nav-badge {
  background: var(--r); color: #fff;
  font-size: 11px; font-weight: 700; padding: 3px 10px;
  border-radius: 20px; letter-spacing: 1px;
  animation: pulse-badge 2s ease-in-out infinite;
}
@keyframes pulse-badge {
  0%,100% { box-shadow: 0 0 0 0 rgba(232,0,29,0.4); }
  50% { box-shadow: 0 0 0 8px rgba(232,0,29,0); }
}
.nav-links { display: flex; align-items: center; gap: 28px; }
.nav-links a {
  color: #444; font-size: 14px; font-weight: 500;
  letter-spacing: 0.5px; transition: color 0.2s; position: relative;
}
.nav-links a:hover { color: #3399FF; }
.nav-links a::after {
  content: ''; position: absolute; bottom: -4px; left: 0; width: 0; height: 2px;
  background: #3399FF; transition: width 0.2s;
}
.nav-links a:hover::after { width: 100%; }
.nav-cta {
  background: #3399FF; color: #fff;
  border: none; cursor: pointer;
  padding: 10px 26px; font-weight: 700; font-size: 14px;
  font-family: 'Noto Sans TC'; letter-spacing: 1px;
  transition: all 0.2s; border-radius: 6px;
  display: inline-block;
}
.nav-cta:hover { background: #2277DD; transform: translateY(-1px); box-shadow: 0 6px 24px rgba(51,153,255,0.3); }

/* ─── SECTION BASE ─── */
section { padding: 100px 40px; }
.section-inner { max-width: 1200px; margin: 0 auto; text-align: center; }
.tag {
  display: inline-flex; align-items: center; gap: 8px;
  background: rgba(255,208,0,0.1); border: 1px solid rgba(255,208,0,0.25);
  color: var(--y); font-size: 11px; font-weight: 400; letter-spacing: 3px;
  text-transform: uppercase; padding: 5px 14px; border-radius: 2px; margin-bottom: 30px;
}
.tag::before {
  content: ''; width: 0; height: 0;
  border-top: 5px solid transparent; border-bottom: 5px solid transparent;
  border-left: 8px solid var(--y);
  animation: arrow-blink 1s ease-in-out infinite;
}
@keyframes arrow-blink { 0%,100%{opacity:1; transform:translateX(0)} 50%{opacity:0.3; transform:translateX(3px)} }
h2 {
  font-family: 'Bebas Neue', sans-serif; font-size: clamp(36px, 5vw, 60px);
  letter-spacing: .5px; line-height: 1.25; color: #fff; margin-bottom: 16px;
}
h2 .y { color: var(--y); }
.lead {
  font-size: 17px; color: rgba(255,255,255,0.8); line-height: 1.8;
  max-width: 620px; font-weight: 300; letter-spacing: .5px; margin: 0 auto;
}

/* ─── HERO ─── */
.hero {
  min-height: 100vh;
  display: flex; flex-direction: column; justify-content: center;
  position: relative; overflow: hidden;
  padding: 100px 40px 80px;
}
.hero-bg {
  position: absolute; inset: 0;
  background:
    linear-gradient(to left, rgba(8,9,13,0) 40%, rgba(8,9,13,0.7) 65%, rgba(8,9,13,0.95) 85%, rgba(8,9,13,1) 100%),
    linear-gradient(to top, rgba(8,9,13,0.8) 0%, transparent 30%),
    url('images/construction-site-fire-accident-hero-bg.webp');
  background-size: cover;
  background-position: center right;
}
.hero-grid {
  position: absolute; inset: 0;
  background-image: linear-gradient(rgba(255,208,0,0.03) 1px, transparent 1px),
                    linear-gradient(90deg, rgba(255,208,0,0.03) 1px, transparent 1px);
  background-size: 70px 70px;
  mask-image: radial-gradient(ellipse at center, black 0%, transparent 70%);
}
.hero-scan {
  position: absolute; left: 0; right: 0; height: 2px; z-index: 3;
  background: linear-gradient(90deg, transparent, rgba(255,208,0,0.6), transparent);
  animation: scan 9s linear infinite;
  pointer-events: none;
}
@keyframes scan { 0% { top: 0; } 50% { top: 100%; } 100% { top: 0; } }
.hero-inner {
  position: relative; z-index: 10;
  max-width: 1200px; margin: 0 auto; width: 100%;
  display: grid; grid-template-columns: 1fr; gap: 64px; align-items: center;
}
.hero-left { }
.hero h1 {
  font-family: 'Noto Sans TC', sans-serif;
  font-size: clamp(42px, 6vw, 64px);
  line-height: 1.3; font-weight: 900; color: #fff; margin-bottom: 8px;
  letter-spacing: 2px;
  text-shadow: 0 2px 16px rgba(0,0,0,0.6), 0 4px 32px rgba(0,0,0,0.4);
}
.hero h1 .accent { color: var(--y); }
.hero-desc {
  margin: 28px 0 36px;
  font-size: 16px; line-height: 1.8; color: rgba(255,255,255,0.7);
  max-width: 560px; font-weight: 300; letter-spacing: .5px;
}
.hero-desc strong { color: #fff; }
.hero-btns { display: flex; gap: 16px; flex-wrap: wrap; }
.btn-primary {
  background: var(--y); color: var(--dark);
  padding: 16px 36px; font-weight: 500; font-size: 16px; letter-spacing: 1px;
  border: none; cursor: pointer; font-family: 'Noto Sans TC';
  border-radius: 4px; transition: all 0.25s; display: inline-block;
}
.btn-primary:hover { background: #fff; transform: translateY(-2px); box-shadow: 0 12px 40px rgba(255,208,0,0.25); }
.btn-ghost {
  border: 1px solid rgba(255,255,255,0.2); color: #fff;
  padding: 15px 32px; font-weight: 500; font-size: 15px;
  background: transparent; cursor: pointer; font-family: 'Noto Sans TC';
  transition: all 0.25s; display: inline-block; border-radius: 2px;
}
.btn-ghost:hover { border-color: var(--y); color: var(--y); }
.hero-stats { display: flex; gap: 36px; margin-top: 48px; }
.stat-num {
  font-family: 'Bebas Neue'; font-size: 48px; color: var(--y); line-height: 1;
  display: block;
}
.stat-num sup { font-size: 16px; vertical-align: baseline; margin-left: 2px; }
.stat-label { font-size: 12px; color: var(--text); letter-spacing: 1px; margin-top: 4px; }

/* hero screen */
.hero-screen {
  position: relative; z-index: 10;
  background: var(--dark3); border: 1px solid var(--border);
  border-radius: 8px; overflow: hidden;
  box-shadow: 0 0 60px rgba(255,208,0,0.15), 0 20px 60px rgba(0,0,0,0.3);
}
.screen-bar {
  background: var(--panel); padding: 10px 16px;
  display: flex; align-items: center; gap: 8px;
  border-bottom: 1px solid var(--border);
  font-size: 11px; color: var(--dim); font-family: 'JetBrains Mono';
}
.screen-dot { width: 10px; height: 10px; border-radius: 50%; }
.screen-body { padding: 20px; }
.screen-tabs { display: flex; gap: 0; margin-bottom: 12px; }
.screen-tabs span {
  padding: 8px 16px; font-size: 11px; color: var(--dim);
  font-family: 'JetBrains Mono'; cursor: default;
  border-bottom: 2px solid transparent;
}
.screen-tabs span.active { color: var(--y); border-bottom-color: var(--y); }
.cam-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.cam-feed {
  position: relative; background: #060810; border-radius: 4px;
  aspect-ratio: 4/3; overflow: hidden;
  border: 1px solid rgba(255,255,255,0.05);
  display: flex; align-items: center; justify-content: center;
}
.cam-feed::after {
  content: '';
  position: absolute; inset: 0;
  background: linear-gradient(135deg, rgba(0,207,192,0.03), rgba(26,95,255,0.03));
}
.cam-feed-label {
  position: absolute; top: 6px; left: 6px;
  font-family: 'JetBrains Mono'; font-size: 9px; font-weight: 700;
  padding: 2px 6px; border-radius: 2px; z-index: 2;
}
.cam-feed-label.red { background: rgba(232,0,29,0.85); color: #fff; }
.cam-feed-label.orange { background: rgba(245,158,11,0.85); color: #fff; }
.cam-feed-label.purple { background: rgba(168,85,247,0.85); color: #fff; }
.cam-feed-icon { font-size: 32px; opacity: 0.3; z-index: 1; }
.cam-bottom {
  position: absolute; bottom: 0; left: 0; right: 0;
  background: rgba(0,0,0,0.7); padding: 6px 10px;
  font-family: 'JetBrains Mono'; font-size: 10px; color: var(--dim);
  display: flex; justify-content: space-between; z-index: 2;
}
.cam-live { color: var(--r); font-weight: 700; }
.screen-stats {
  display: flex; gap: 16px; margin-top: 12px;
}
.screen-stat {
  flex: 1; background: var(--dark2); border: 1px solid var(--border);
  border-radius: 4px; padding: 10px; text-align: center;
}
.screen-stat-val {
  font-family: 'Bebas Neue'; font-size: 24px; color: var(--teal);
}
.screen-stat-label { font-size: 10px; color: var(--dim); margin-top: 2px; }

/* ─── CHALLENGES ─── */
.challenges-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 24px;
  margin-top: 56px; text-align: center;
}
.challenge-card {
  background: var(--dark3); border: 1px solid var(--border);
  border-radius: 8px; overflow: hidden;
  transition: all 0.3s;
}
.challenge-card-img {
  width: 100%; height: 280px; object-fit: cover; display: block;
}
.challenge-card-body { padding: 20px 36px; }
.challenge-card:hover { border-color: rgba(255,208,0,0.25); transform: translateY(-4px); box-shadow: 0 16px 40px rgba(0,0,0,0.3); }
.challenge-card h3 {
  font-size: 20px; font-weight: 700; color: var(--y);
  margin-bottom: 20px; display: flex; align-items: center; justify-content: center; gap: 12px;
}
.challenge-icon {
  width: 40px; height: 40px; border-radius: 8px;
  display: inline-flex; align-items: center; justify-content: center;
  font-size: 20px; flex-shrink: 0;
}
.challenge-icon.orange { background: rgba(255,152,0,0.15); border: 1px solid rgba(255,152,0,0.3); }
.challenge-icon.red { background: rgba(232,0,29,0.15); border: 1px solid rgba(232,0,29,0.3); }
.challenge-card ul { list-style: none; margin-bottom: 20px; }
.challenge-tags {
  display: flex; flex-direction: column; gap: 10px; align-items: center; margin-bottom: 8px;
}
.challenge-tag {
  background: rgba(255,255,255,0.06); border: 1px solid rgba(255,255,255,0.12);
  color: var(--text); font-size: 14px; font-weight: 500;
  padding: 10px 24px; border-radius: 6px;
  letter-spacing: 0.5px;
  transition: all 0.3s;
  opacity: 0; transform: translateY(16px);
  width: fit-content;
}
.challenge-tag.visible {
  opacity: 1; transform: translateY(0);
}
.challenge-tag.visible:nth-child(1) { animation: tag-sway-left 5s ease-in-out 0s infinite; }
.challenge-tag.visible:nth-child(2) { animation: tag-sway-right 5s ease-in-out 0.8s infinite; }
.challenge-tag.visible:nth-child(3) { animation: tag-sway-left 5s ease-in-out 1.6s infinite; }
@keyframes tag-sway-left {
  0%, 100% { transform: translateX(0); border-color: rgba(255,255,255,0.12); }
  50% { transform: translateX(-8px); border-color: rgba(255,208,0,0.25); }
}
@keyframes tag-sway-right {
  0%, 100% { transform: translateX(0); border-color: rgba(255,255,255,0.12); }
  50% { transform: translateX(8px); border-color: rgba(255,208,0,0.25); }
}
.challenge-quote {
  padding: 20px 36px; font-size: 18px; font-weight: 700;
  border-top: 1px solid var(--border);
  text-align: center; letter-spacing: 1px;
}
.challenge-quote.warm {
  background: rgba(255,98,0,0.06); color: var(--o);
  text-shadow: 0 2px 12px rgba(255,98,0,0.4), 0 4px 20px rgba(255,98,0,0.2);
  animation: glow-warm 2.5s ease-in-out infinite;
}
.challenge-quote.cool {
  background: rgba(26,95,255,0.06); color: #5b9aff;
  text-shadow: 0 2px 12px rgba(26,95,255,0.4), 0 4px 20px rgba(26,95,255,0.2);
  animation: glow-cool 2.5s ease-in-out infinite;
}
@keyframes glow-warm {
  0%,100% { text-shadow: 0 2px 12px rgba(255,98,0,0.4), 0 4px 20px rgba(255,98,0,0.2); }
  50% { text-shadow: 0 2px 20px rgba(255,98,0,0.7), 0 4px 32px rgba(255,98,0,0.4); }
}
@keyframes glow-cool {
  0%,100% { text-shadow: 0 2px 12px rgba(26,95,255,0.4), 0 4px 20px rgba(26,95,255,0.2); }
  50% { text-shadow: 0 2px 20px rgba(26,95,255,0.7), 0 4px 32px rgba(26,95,255,0.4); }
}

/* ─── SOLUTIONS ─── */
.solutions-section { background: var(--dark2); position: relative; overflow: hidden; min-height: 100vh; display: flex; align-items: center; justify-content: center; }
.solutions-section::before {
  content: ''; position: absolute; inset: 0;
  background: url('images/ai-construction-safety-team-collaboration.webp') center / cover no-repeat;
  opacity: 0.2;
  z-index: 0;
}
.solutions-section > * { position: relative; z-index: 2; }
.solutions-grid {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px;
  margin-top: 80px; background: var(--border);
}
.solution-card {
  background: rgba(16,19,24,0.6); padding: 40px 28px;
  transition: all 0.3s; position: relative; overflow: hidden; text-align: center;
}
.solution-card:hover { background: rgba(30,36,51,0.9); transform: translateY(-6px); box-shadow: 0 16px 40px rgba(0,0,0,0.3); }
.solution-card::after {
  content: ''; position: absolute; top: 0; left: -100%; width: 60%; height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.04), transparent);
  transition: left 0.7s ease;
}
.solution-card:hover::after { left: 120%; }
.solution-icon {
  width: 52px; height: 52px; border-radius: 8px;
  display: flex; align-items: center; justify-content: center;
  margin: 0 auto 20px;
}
.solution-icon img { width: 60px; height: 60px; }
.solution-card h3 { font-size: 18px; font-weight: 600; letter-spacing: .5px; color: #fff; margin-bottom: 10px; }
.solution-card p { font-size: 14px; color: var(--dim); line-height: 1.8; }
.solution-tag {
  display: inline-block; margin-top: 14px;
  background: rgba(255,208,0,0.1); border: 1px solid rgba(255,208,0,0.2);
  color: var(--y); font-size: 11px; font-weight: 700; letter-spacing: 1px;
  padding: 3px 10px; border-radius: 20px;
}

/* ─── WHY AI ─── */
.why-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 64px;
  margin-top: 56px; align-items: center; text-align: left;
}
.why-item {
  display: flex; gap: 16px; margin-bottom: 32px;
  padding: 20px; border-radius: 8px;
  background: rgba(255,255,255,0.02); border: 1px solid var(--border);
  transition: all 0.3s;
}
.why-item:hover { border-color: rgba(255,208,0,0.2); background: rgba(255,255,255,0.04); }
.why-dot {
  width: 10px; height: 10px; border-radius: 50%;
  background: var(--teal); margin-top: 6px; flex-shrink: 0;
}
.why-item h4 { font-size: 16px; font-weight: 700; color: #fff; margin-bottom: 6px; }
.why-item p { font-size: 14px; color: var(--dim); line-height: 1.7; }
.stats-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 16px;
}
.stat-card {
  background: var(--dark3); border: 1px solid var(--border);
  border-radius: 8px; padding: 28px 20px; text-align: center;
  transition: all 0.3s;
}
.stat-card:hover { border-color: rgba(255,208,0,0.25); transform: translateY(-4px); }
.stat-card .stat-number {
  font-family: 'Bebas Neue'; font-size: 44px; color: var(--y); line-height: 1;
}
.stat-card .stat-number small { font-size: 24px; margin-left: 2px; }
.stat-card .stat-text {
  font-size: 15px; font-weight: 500; color: var(--dim); margin-top: 8px; letter-spacing: 1px;
}
.stat-card .stat-source {
  font-size: 12px; color: rgba(255,255,255,0.5); margin-top: 6px; letter-spacing: 0.5px;
}

/* ─── WHY SECTION ─── */
.why-section { }

/* ─── HOW IT WORKS ─── */
.how-section {
  position: relative; overflow: hidden;
  background: var(--dark);
}
.how-grid {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 2px;
  margin-top: 56px;
}
.how-step {
  background: rgba(24,29,39,0.6); padding: 36px 28px;
  position: relative; overflow: hidden;
  transition: all 0.3s; text-align: left;
}
.how-step:hover { background: rgba(30,36,51,0.9); transform: translateY(-6px); box-shadow: 0 12px 32px rgba(255,208,0,0.1); }
.how-step::after {
  content: ''; position: absolute; bottom: 0; left: 0; width: 100%; height: 3px;
  background: var(--y); transform: scaleX(0); transform-origin: left;
  transition: transform 0.3s;
}
.how-step:hover::after { transform: scaleX(1); }
.step-num {
  font-family: 'Bebas Neue'; font-size: 72px; color: rgba(255,208,0,0.15);
  line-height: 1; margin-bottom: 16px;
}
.how-step h3 { font-size: 16px; font-weight: 700; color: #fff; margin-bottom: 10px; }
.how-step p { font-size: 14px; color: var(--dim); line-height: 1.7; }

/* ─── DEFINITION ─── */
.definition-section {
  padding: 60px 40px;
  background: var(--dark2);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
.definition-text {
  max-width: 900px; margin: 0 auto;
  font-size: 16px; line-height: 2; color: var(--dim);
  text-align: center; letter-spacing: 0.5px;
}
.definition-text strong { color: var(--y); font-weight: 700; }

/* ─── FAQ ─── */
.faq-section {
  background: var(--dark2); position: relative; overflow: hidden;
}
.faq-section::before {
  content: ''; position: absolute;
  top: -10%; left: -10%; width: 120%; height: 120%;
  background: url('images/construction-site-fire-accident-hero-bg.webp') center / cover no-repeat;
  opacity: 0.5; z-index: 0;
  animation: faq-bg-drift 20s ease-in-out infinite alternate;
}
@keyframes faq-bg-drift {
  0% { transform: scale(1) translate(0, 0); }
  33% { transform: scale(1.05) translate(-1%, 1%); }
  66% { transform: scale(1.03) translate(1%, -0.5%); }
  100% { transform: scale(1.07) translate(-0.5%, 1.5%); }
}
.faq-section::after {
  content: ''; position: absolute; inset: 0;
  background: linear-gradient(to bottom, rgba(16,19,24,0.7) 0%, rgba(16,19,24,0.5) 100%);
  z-index: 1;
}
.faq-section > * { position: relative; z-index: 2; }
.faq-list {
  max-width: 800px; margin: 48px auto 0; text-align: left;
}
.faq-item {
  background: var(--dark3); border: 1px solid var(--border);
  border-radius: 8px; margin-bottom: 12px;
  transition: border-color 0.3s;
}
.faq-item[open] { border-color: rgba(255,208,0,0.25); }
.faq-item summary {
  padding: 20px 24px; font-size: 16px; font-weight: 700; color: #fff;
  cursor: pointer; list-style: none;
  display: flex; align-items: center; justify-content: space-between;
  transition: color 0.2s;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
  content: '+'; font-size: 22px; color: var(--y); font-weight: 300;
  transition: transform 0.3s;
}
.faq-item[open] summary::after { content: '−'; transform: rotate(180deg); }
.faq-item summary:hover { color: var(--y); }
.faq-item p {
  padding: 0 24px 20px; font-size: 15px; color: var(--dim);
  line-height: 1.8; letter-spacing: 0.3px;
}

/* ─── FORM ─── */
.form-section {
  background: linear-gradient(135deg, #0E1118 0%, #131824 100%);
  border-top: 1px solid rgba(255,208,0,0.1);
}
.form-wrapper {
  max-width: 900px; margin: 0 auto;
  background: var(--dark3); border: 1px solid var(--border);
  border-radius: 12px; padding: 56px 48px;
  position: relative; overflow: hidden;
}
.form-wrapper::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: linear-gradient(90deg, var(--y), var(--o), var(--r));
}
.form-header { text-align: center; margin-bottom: 40px; }
.form-header h2 { font-family: 'Noto Sans TC'; font-size: 28px; font-weight: 900; }
.form-header p { color: var(--dim); font-size: 15px; margin-top: 12px; }
.form-group { margin-bottom: 20px; }
.form-group label {
  display: block; font-size: 13px; font-weight: 700; color: #6B7592;
  margin-bottom: 8px; letter-spacing: 1px;
}
.form-group label .req { color: var(--r); }
.form-group input,
.form-group select {
  width: 100%; background: var(--dark2); border: 1px solid var(--border);
  color: #fff; padding: 14px 16px; font-size: 14px;
  font-family: 'Noto Sans TC'; border-radius: 4px;
  transition: border-color 0.2s; outline: none;
}
.form-group input::placeholder { color: var(--dim); }
.form-group input:focus,
.form-group select:focus { border-color: var(--y); }
.form-group select { cursor: pointer; }
.form-group select option { background: var(--dark2); }
.form-submit {
  width: 100%; margin-top: 8px;
  background: var(--y); color: var(--dark);
  border: none; padding: 18px; font-weight: 900; font-size: 17px;
  font-family: 'Noto Sans TC'; cursor: pointer; letter-spacing: 2px;
  transition: all 0.25s; border-radius: 4px;
}
.form-submit:hover { background: #fff; box-shadow: 0 12px 40px rgba(255,208,0,0.25); }
.form-note { text-align: center; font-size: 12px; color: var(--dim); margin-top: 16px; }

/* ─── FOOTER ─── */
footer {
  background: #2a2a2a; border-top: 1px solid rgba(255,255,255,0.08);
  padding: 60px 40px 0;
}
.footer-inner {
  max-width: 1200px; margin: 0 auto;
  display: grid; grid-template-columns: 1.8fr 1fr 1fr 1fr 1.2fr; gap: 48px;
}
.footer-logo {
  font-family: 'Inter', sans-serif; font-size: 32px; letter-spacing: 1px;
  font-weight: 700; color: var(--y); margin-bottom: 16px;
}
.footer-desc { font-size: 13px; color: #94A3B8; line-height: 1.8; }
.footer-col h5 {
  font-size: 14px; font-weight: 700; color: #fff;
  margin-bottom: 20px; letter-spacing: 0.5px;
}
.footer-col a {
  display: block; font-size: 13px; color: #94A3B8;
  margin-bottom: 10px; transition: color 0.2s;
}
.footer-col a:hover { color: var(--y); }
.footer-bottom {
  max-width: 1200px; margin: 0 auto;
  border-top: 1px solid rgba(255,255,255,0.08);
  margin-top: 48px; padding: 24px 0;
  text-align: center;
}
.footer-copy { font-size: 12px; color: #94A3B8; }

/* ─── BACK TO TOP ─── */
#backToTop {
  position: fixed; bottom: 32px; right: 32px; z-index: 99999;
  width: 44px; height: 44px; border-radius: 50%;
  background: var(--y); color: var(--dark); border: none; cursor: pointer;
  font-size: 20px; font-weight: 700;
  display: flex; align-items: center; justify-content: center;
  opacity: 0; visibility: hidden;
  transition: opacity 0.3s, visibility 0.3s, transform 0.2s;
  box-shadow: 0 4px 16px rgba(255,208,0,0.3);
}
#backToTop.show { opacity: 1; visibility: visible; }
#backToTop:hover { transform: translateY(-3px); }

/* ─── HERO ENTRANCE ─── */
.hero-anim {
  opacity: 0;
  transform: translateY(30px);
  animation: hero-entrance 0.8s cubic-bezier(0.22, 1, 0.36, 1) forwards;
  animation-delay: var(--delay, 0s);
}
@keyframes hero-entrance {
  to { opacity: 1; transform: translateY(0); }
}

/* ─── ANIMATIONS ─── */
.fade-up { opacity: 0; transform: translateY(60px); transition: all 0.8s cubic-bezier(0.22, 1, 0.36, 1); }
.fade-up.visible { opacity: 1; transform: translateY(0); }
.fade-in { opacity: 0; transition: opacity 1s ease; }
.fade-in.visible { opacity: 1; }
.slide-left { opacity: 0; transform: translateX(-60px); transition: all 0.8s cubic-bezier(0.22, 1, 0.36, 1); }
.slide-left.visible { opacity: 1; transform: translateX(0); }
.slide-right { opacity: 0; transform: translateX(60px); transition: all 0.8s cubic-bezier(0.22, 1, 0.36, 1); }
.slide-right.visible { opacity: 1; transform: translateX(0); }
.scale-in { opacity: 0; transform: scale(0.85); transition: all 0.7s cubic-bezier(0.22, 1, 0.36, 1); }
.scale-in.visible { opacity: 1; transform: scale(1); }
.stagger-children > * {
  opacity: 0; transform: translateY(40px);
  transition: all 0.7s cubic-bezier(0.22, 1, 0.36, 1);
}
.stagger-children.visible > *:nth-child(1) { transition-delay: 0s; }
.stagger-children.visible > *:nth-child(2) { transition-delay: 0.3s; }
.stagger-children.visible > *:nth-child(3) { transition-delay: 0.6s; }
.stagger-children.visible > *:nth-child(4) { transition-delay: 0.9s; }
.stagger-children.visible > * { opacity: 1; transform: translateY(0); }
.section-inner > .tag,
.section-inner > h2,
.section-inner > .lead {
  opacity: 0; transform: translateY(30px);
  transition: all 0.7s cubic-bezier(0.22, 1, 0.36, 1);
}
.section-inner.visible > .tag { transition-delay: 0s; }
.section-inner.visible > h2 { transition-delay: 0.15s; }
.section-inner.visible > .lead { transition-delay: 0.3s; }
.section-inner.visible > .tag,
.section-inner.visible > h2,
.section-inner.visible > .lead { opacity: 1; transform: translateY(0); }

/* ─── RESPONSIVE ─── */
@media (max-width: 900px) {
  .nav-links { display: none; }
  .hero-inner { grid-template-columns: 1fr; gap: 40px; }
  .hero-screen { max-width: 480px; }
  .challenges-grid { grid-template-columns: 1fr; }
  .solutions-grid { grid-template-columns: 1fr 1fr; }
  .how-grid { grid-template-columns: 1fr 1fr; }
  .why-grid { grid-template-columns: 1fr; }
  .footer-inner { grid-template-columns: 1fr 1fr; gap: 40px; }
  .form-wrapper { padding: 36px 24px; }
}
@media (max-width: 600px) {
  section { padding: 70px 20px; }
  nav { padding: 0 20px; }
  .hero { padding: 80px 20px 60px; }
  .solutions-grid { grid-template-columns: 1fr; }
  .how-grid { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: 1fr 1fr; }
  .hero-stats { flex-wrap: wrap; gap: 24px; }
  .footer-inner { grid-template-columns: 1fr; }
}