/* ============================================
   Blockit - World-Class Professional Design
   ============================================ */

/* --- CSS Variables --- */
:root {
  --blue-50: #E3F2FD;
  --blue-100: #BBDEFB;
  --blue-200: #90CAF9;
  --blue-300: #64B5F6;
  --blue-400: #42A5F5;
  --blue-500: #2196F3;
  --blue-600: #1E88E5;
  --blue-700: #1976D2;
  --blue-800: #1565C0;
  --blue-900: #0D47A1;

  --teal-50: #E0F2F1;
  --teal-100: #B2DFDB;
  --teal-400: #26A69A;
  --teal-600: #00897B;

  --purple-50: #F3E5F5;
  --purple-100: #E1BEE7;
  --purple-400: #AB47BC;
  --purple-600: #8E24AA;

  --orange-400: #FFA726;
  --orange-600: #FB8C00;
  
  --red-400: #EF5350;
  --red-600: #E53935;

  --grey-50: #FAFAFA;
  --grey-100: #F5F5F5;
  --grey-200: #EEEEEE;
  --grey-300: #E0E0E0;
  --grey-400: #BDBDBD;
  --grey-500: #9E9E9E;
  --grey-600: #757575;
  --grey-700: #616161;
  --grey-800: #424242;
  --grey-900: #212121;

  --white: #FFFFFF;
  --text-primary: var(--grey-900);
  --text-secondary: var(--grey-600);
  --text-muted: var(--grey-400);
  --bg-page: var(--white);
  --bg-alt: var(--grey-50);
  --accent: var(--blue-600);
  --accent-hover: var(--blue-700);
  --accent-light: var(--blue-50);

  --font-stack: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, sans-serif;
  --max-width: 1140px;
  --radius: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.04);
  --shadow-md: 0 8px 24px rgba(30,136,229,0.12);
  --shadow-lg: 0 16px 48px rgba(30,136,229,0.15);
  --shadow-xl: 0 24px 64px rgba(30,136,229,0.18);
  --transition: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-bounce: 0.6s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-stack);
  font-size: 18px;
  line-height: 1.75;
  color: var(--text-primary);
  background: var(--bg-page);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

img {
  max-width: 100%;
  display: block;
}

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

a:hover {
  color: var(--accent-hover);
}

/* --- Typography --- */
h1, h2, h3, h4 {
  line-height: 1.2;
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -0.025em;
}

h1 { 
  font-size: 3.5rem; 
  letter-spacing: -0.04em;
  font-weight: 900;
}

h2 { 
  font-size: 2.5rem; 
  letter-spacing: -0.03em;
  font-weight: 800;
}

h3 { 
  font-size: 1.5rem;
  font-weight: 700;
}

h4 { 
  font-size: 1.15rem;
  font-weight: 600;
}

p {
  color: var(--text-secondary);
  line-height: 1.8;
}

/* --- Layout --- */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 32px;
}

section {
  padding: 120px 0;
  position: relative;
}

/* --- Decorative Elements --- */
section::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 100%;
  max-width: 1400px;
  height: 100%;
  pointer-events: none;
  z-index: 0;
}

section > .container {
  position: relative;
  z-index: 1;
}

/* --- Header / Nav --- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(255,255,255,0.80);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid rgba(0,0,0,0.06);
  transition: all var(--transition);
}

.site-header.scrolled {
  background: rgba(255,255,255,0.92);
  box-shadow: 0 4px 24px rgba(0,0,0,0.06);
  border-bottom-color: rgba(0,0,0,0.08);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.4rem;
  font-weight: 900;
  color: var(--text-primary);
  letter-spacing: -0.02em;
  transition: transform var(--transition);
}

.nav-logo:hover {
  transform: translateY(-1px);
}

.nav-logo-img {
  height: 36px;
  width: 36px;
  object-fit: contain;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 40px;
  list-style: none;
}

.nav-links a {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-secondary);
  transition: all var(--transition);
  position: relative;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent);
  transition: width var(--transition);
}

.nav-links a:hover {
  color: var(--accent);
}

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

.nav-cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 24px;
  background: var(--accent);
  color: var(--white) !important;
  border-radius: 12px;
  font-size: 0.95rem;
  font-weight: 700;
  box-shadow: 0 4px 12px rgba(30,136,229,0.25);
  transition: all var(--transition);
}

.nav-cta::after {
  display: none !important;
}

.nav-cta:hover {
  background: var(--accent-hover);
  color: var(--white) !important;
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(30,136,229,0.35);
}

/* Mobile nav toggle */
.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.nav-toggle span {
  display: block;
  width: 26px;
  height: 2.5px;
  background: var(--text-primary);
  margin: 5px 0;
  border-radius: 3px;
  transition: all var(--transition);
}

/* --- Hero --- */
.hero {
  padding: 200px 0 140px;
  text-align: center;
  background: 
    radial-gradient(ellipse 80% 50% at 50% -20%, rgba(30,136,229,0.15), transparent),
    linear-gradient(180deg, var(--blue-50) 0%, rgba(227,242,253,0.4) 50%, var(--white) 100%);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -10%;
  width: 120%;
  height: 100%;
  background: 
    radial-gradient(circle at 30% 20%, rgba(30,136,229,0.08) 0%, transparent 50%),
    radial-gradient(circle at 70% 60%, rgba(30,136,229,0.06) 0%, transparent 50%);
  animation: float 20s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(-20px, -20px) scale(1.05); }
}

.hero h1 {
  margin-bottom: 28px;
  max-width: 900px;
  margin-left: auto;
  margin-right: auto;
  line-height: 1.15;
  background: linear-gradient(135deg, var(--grey-900) 0%, var(--grey-700) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: 1.3rem;
  color: var(--text-secondary);
  max-width: 680px;
  margin: 0 auto 48px;
  line-height: 1.7;
  font-weight: 500;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 20px;
  flex-wrap: wrap;
  margin-bottom: 80px;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 18px 40px;
  background: linear-gradient(135deg, var(--blue-600) 0%, var(--blue-700) 100%);
  color: var(--white);
  border: none;
  border-radius: 14px;
  font-size: 1.1rem;
  font-weight: 700;
  cursor: pointer;
  transition: all var(--transition);
  box-shadow: 
    0 4px 20px rgba(30,136,229,0.30),
    0 1px 3px rgba(0,0,0,0.08),
    inset 0 1px 0 rgba(255,255,255,0.1);
  position: relative;
  overflow: hidden;
}

.btn-primary::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
  transition: left 0.5s;
}

.btn-primary:hover::before {
  left: 100%;
}

.btn-primary:hover {
  background: linear-gradient(135deg, var(--blue-700) 0%, var(--blue-800) 100%);
  color: var(--white);
  transform: translateY(-3px);
  box-shadow: 
    0 8px 32px rgba(30,136,229,0.40),
    0 2px 8px rgba(0,0,0,0.12),
    inset 0 1px 0 rgba(255,255,255,0.1);
}

.btn-primary:active {
  transform: translateY(-1px);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 18px 40px;
  background: var(--white);
  color: var(--text-primary);
  border: 2px solid var(--grey-300);
  border-radius: 14px;
  font-size: 1.1rem;
  font-weight: 700;
  cursor: pointer;
  transition: all var(--transition);
  box-shadow: 0 2px 8px rgba(0,0,0,0.04);
}

.btn-secondary:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-3px);
  box-shadow: 0 8px 24px rgba(30,136,229,0.15);
}

/* --- Problem Section --- */
.problem {
  background: 
    linear-gradient(180deg, var(--white) 0%, var(--grey-50) 50%, var(--white) 100%);
  text-align: center;
  position: relative;
}

.problem::before {
  background: 
    radial-gradient(circle at 20% 50%, rgba(239,83,80,0.04) 0%, transparent 50%),
    radial-gradient(circle at 80% 50%, rgba(30,136,229,0.04) 0%, transparent 50%);
}

.problem-headline {
  max-width: 800px;
  margin: 0 auto 64px;
  font-size: 1.4rem;
  line-height: 2;
  color: var(--text-secondary);
  font-weight: 500;
}

.problem-hours {
  font-size: 4.5rem;
  font-weight: 900;
  background: linear-gradient(135deg, var(--blue-600) 0%, var(--blue-700) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
  display: block;
  letter-spacing: -0.04em;
  margin: 8px 0;
}

.problem-connector {
  display: block;
  font-size: 1.3rem;
  color: var(--text-secondary);
  margin: 12px 0;
  font-weight: 500;
}

.problem-equals {
  display: block;
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--grey-400);
  margin: 20px 0;
  line-height: 1;
}

.problem-days {
  font-size: 4.5rem;
  font-weight: 900;
  background: linear-gradient(135deg, #E53935 0%, #C62828 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
  display: block;
  letter-spacing: -0.04em;
  margin: 8px 0;
}

.problem-text {
  max-width: 720px;
  margin: 0 auto;
  padding: 48px 40px;
  background: var(--white);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-md);
  border: 1px solid var(--grey-200);
}

.problem-text p {
  font-size: 1.25rem;
  line-height: 1.8;
  margin-bottom: 24px;
  color: var(--text-secondary);
}

.problem-text p:last-child {
  margin-bottom: 0;
}

.text-emphasis {
  color: var(--text-primary);
  font-weight: 700;
}

/* --- Features --- */
.features {
  background: 
    radial-gradient(ellipse 100% 60% at 50% 40%, rgba(30,136,229,0.06), transparent),
    linear-gradient(180deg, var(--white) 0%, var(--blue-50) 100%);
  position: relative;
}

.features::before {
  background: 
    radial-gradient(circle at 15% 20%, rgba(30,136,229,0.04) 0%, transparent 40%),
    radial-gradient(circle at 85% 80%, rgba(30,136,229,0.04) 0%, transparent 40%);
}

.section-header {
  text-align: center;
  margin-bottom: 80px;
}

.section-header h2 {
  margin-bottom: 16px;
  background: linear-gradient(135deg, var(--grey-900) 0%, var(--grey-700) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.section-header p {
  font-size: 1.2rem;
  max-width: 640px;
  margin: 0 auto;
  line-height: 1.7;
  font-weight: 500;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.feature-card {
  background: var(--white);
  padding: 48px 36px;
  border-radius: var(--radius-xl);
  border: 1px solid rgba(30,136,229,0.1);
  transition: all var(--transition);
  cursor: pointer;
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
  opacity: 0;
  transition: opacity var(--transition);
}

.feature-card::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: var(--radius-xl);
  padding: 1px;
  background: linear-gradient(135deg, rgba(30,136,229,0.2), transparent 40%, rgba(30,136,229,0.2));
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  opacity: 0;
  transition: opacity var(--transition);
}

.feature-card:hover {
  transform: translateY(-8px);
  box-shadow: 
    var(--shadow-xl),
    0 0 0 1px rgba(30,136,229,0.1);
  border-color: rgba(30,136,229,0.2);
}

.feature-card:hover::before,
.feature-card:hover::after {
  opacity: 1;
}

.feature-icon {
  width: 72px;
  height: 72px;
  border-radius: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  margin-bottom: 24px;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition);
}

.feature-card:hover .feature-icon {
  transform: scale(1.1) rotate(5deg);
}

.feature-icon.blue {
  background: linear-gradient(135deg, var(--blue-50) 0%, var(--blue-100) 100%);
}

.feature-icon.teal {
  background: linear-gradient(135deg, var(--teal-50) 0%, var(--teal-100) 100%);
}

.feature-icon.purple {
  background: linear-gradient(135deg, var(--purple-50) 0%, var(--purple-100) 100%);
}

.feature-card h3 {
  margin-bottom: 16px;
  font-size: 1.5rem;
}

.feature-card p {
  font-size: 1.05rem;
  line-height: 1.75;
  color: var(--text-secondary);
}

/* --- Interventions Intro --- */
.interventions-intro {
  background: 
    linear-gradient(180deg, var(--blue-50) 0%, var(--white) 100%);
  padding-bottom: 60px;
  position: relative;
}

.interventions-intro::before {
  background: 
    radial-gradient(circle at 50% 50%, rgba(30,136,229,0.06) 0%, transparent 60%);
}

.interventions-intro-detail {
  max-width: 680px;
  margin: 0 auto;
  text-align: center;
  padding: 32px;
  background: rgba(255,255,255,0.8);
  backdrop-filter: blur(10px);
  border-radius: var(--radius-lg);
  border: 1px solid rgba(30,136,229,0.1);
}

.interventions-intro-detail p {
  font-size: 1.15rem;
  color: var(--text-secondary);
  line-height: 1.8;
  font-weight: 500;
}

/* --- Demo Sections --- */
.demo-section {
  background: var(--white);
  position: relative;
}

.demo-section:nth-child(even) {
  background: 
    linear-gradient(180deg, var(--white) 0%, var(--grey-50) 50%, var(--white) 100%);
}

.demo-section:nth-child(odd)::before {
  background: 
    radial-gradient(circle at 10% 50%, rgba(30,136,229,0.03) 0%, transparent 50%),
    radial-gradient(circle at 90% 50%, rgba(38,166,154,0.03) 0%, transparent 50%);
}

.demo-section:nth-child(even)::before {
  background: 
    radial-gradient(circle at 30% 30%, rgba(171,71,188,0.03) 0%, transparent 50%),
    radial-gradient(circle at 70% 70%, rgba(30,136,229,0.03) 0%, transparent 50%);
}

.demo-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}

.demo-layout--reverse {
  direction: rtl;
}

.demo-layout--reverse > * {
  direction: ltr;
}

.demo-text {
  max-width: 520px;
}

.demo-label {
  display: inline-block;
  padding: 8px 20px;
  background: linear-gradient(135deg, var(--blue-50) 0%, var(--blue-100) 100%);
  color: var(--blue-700);
  border-radius: 100px;
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 20px;
  box-shadow: 0 2px 8px rgba(30,136,229,0.15);
}

.demo-text h2 {
  margin-bottom: 24px;
  font-size: 2.2rem;
}

.demo-text p {
  font-size: 1.1rem;
  line-height: 1.8;
  margin-bottom: 20px;
  color: var(--text-secondary);
}

.demo-text p:last-child {
  margin-bottom: 0;
}

/* --- Analytics Intro --- */
#analytics-intro {
  background: 
    linear-gradient(180deg, var(--white) 0%, var(--purple-50) 100%);
  padding-bottom: 60px;
}

#analytics-intro::before {
  background: 
    radial-gradient(circle at 50% 50%, rgba(171,71,188,0.06) 0%, transparent 60%);
}

/* --- How It Works --- */
.how-it-works {
  background: 
    radial-gradient(ellipse 100% 60% at 50% 40%, rgba(30,136,229,0.08), transparent),
    linear-gradient(180deg, var(--white) 0%, var(--blue-50) 100%);
  position: relative;
}

.how-it-works::before {
  background: 
    radial-gradient(circle at 25% 25%, rgba(30,136,229,0.05) 0%, transparent 50%),
    radial-gradient(circle at 75% 75%, rgba(30,136,229,0.05) 0%, transparent 50%);
}

.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 48px;
  max-width: 1000px;
  margin: 0 auto;
}

.step {
  text-align: center;
  padding: 40px 32px;
  background: var(--white);
  border-radius: var(--radius-xl);
  border: 1px solid rgba(30,136,229,0.1);
  transition: all var(--transition);
  position: relative;
}

.step::before {
  content: '';
  position: absolute;
  top: -24px;
  left: 50%;
  transform: translateX(-50%);
  width: 48px;
  height: 4px;
  background: linear-gradient(90deg, var(--blue-400), var(--blue-600));
  border-radius: 100px;
  opacity: 0;
  transition: all var(--transition);
}

.step:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(30,136,229,0.2);
}

.step:hover::before {
  opacity: 1;
  top: -32px;
}

.step-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--blue-600) 0%, var(--blue-700) 100%);
  color: var(--white);
  font-size: 1.5rem;
  font-weight: 900;
  margin-bottom: 24px;
  box-shadow: 
    0 8px 24px rgba(30,136,229,0.30),
    inset 0 1px 0 rgba(255,255,255,0.2);
  transition: transform var(--transition);
}

.step:hover .step-number {
  transform: scale(1.1) rotate(5deg);
}

.step h3 {
  margin-bottom: 12px;
  font-size: 1.4rem;
}

.step p {
  font-size: 1.05rem;
  line-height: 1.7;
}

/* --- Bottom CTA --- */
.bottom-cta {
  text-align: center;
  background: 
    radial-gradient(ellipse 80% 50% at 50% 50%, rgba(30,136,229,0.12), transparent),
    linear-gradient(180deg, var(--white) 0%, var(--blue-50) 60%, var(--blue-100) 100%);
  position: relative;
}

.bottom-cta::before {
  background: 
    radial-gradient(circle at 30% 30%, rgba(30,136,229,0.08) 0%, transparent 50%),
    radial-gradient(circle at 70% 70%, rgba(30,136,229,0.08) 0%, transparent 50%);
}

.bottom-cta h2 {
  margin-bottom: 20px;
  font-size: 2.8rem;
  background: linear-gradient(135deg, var(--grey-900) 0%, var(--grey-700) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.bottom-cta > .container > p {
  font-size: 1.25rem;
  max-width: 580px;
  margin: 0 auto 48px;
  line-height: 1.8;
  font-weight: 500;
}

.cta-note {
  font-size: 0.95rem !important;
  color: var(--text-muted) !important;
  margin-top: 20px !important;
  font-weight: 500 !important;
}

/* --- Footer --- */
.site-footer {
  padding: 64px 0;
  border-top: 1px solid var(--grey-200);
  background: var(--white);
}

.footer-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 24px;
}

.footer-left {
  display: flex;
  align-items: center;
  gap: 32px;
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 1.2rem;
  font-weight: 900;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

.footer-logo-img {
  height: 32px;
  width: 32px;
  object-fit: contain;
}

.footer-copyright {
  font-size: 0.9rem;
  color: var(--text-muted);
  font-weight: 500;
}

.footer-links {
  display: flex;
  gap: 32px;
  list-style: none;
}

.footer-links a {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-secondary);
  transition: color var(--transition);
}

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

/* ============================================
   Content Pages (Privacy, Contact)
   ============================================ */
.page-hero {
  padding: 160px 0 64px;
  background: 
    radial-gradient(ellipse 80% 50% at 50% 30%, rgba(30,136,229,0.12), transparent),
    linear-gradient(180deg, var(--blue-50) 0%, var(--white) 100%);
  text-align: center;
}

.page-hero h1 {
  background: linear-gradient(135deg, var(--grey-900) 0%, var(--grey-700) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.page-hero p {
  margin-top: 16px;
  font-size: 1.2rem;
  font-weight: 500;
}

.page-content {
  padding: 64px 0 120px;
}

.page-content .container {
  max-width: 800px;
}

.page-content h2 {
  font-size: 1.8rem;
  margin-top: 48px;
  margin-bottom: 16px;
  font-weight: 800;
}

.page-content h2:first-child {
  margin-top: 0;
}

.page-content p {
  margin-bottom: 20px;
  font-size: 1.05rem;
  line-height: 1.8;
}

.page-content ul {
  margin-bottom: 20px;
  padding-left: 32px;
}

.page-content li {
  margin-bottom: 12px;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* Contact page */
.contact-card {
  background: var(--white);
  border: 1px solid var(--grey-200);
  border-radius: var(--radius-xl);
  padding: 64px;
  text-align: center;
  max-width: 560px;
  margin: 0 auto;
  box-shadow: var(--shadow-md);
}

.contact-card p {
  margin-bottom: 32px;
  font-size: 1.15rem;
}

.contact-email {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--accent);
  transition: all var(--transition);
}

.contact-email:hover {
  color: var(--accent-hover);
  transform: translateY(-2px);
}

/* ============================================
   Responsive Design
   ============================================ */

/* Large Tablet */
@media (max-width: 1024px) {
  .container {
    padding: 0 28px;
  }
  
  .demo-layout {
    gap: 60px;
  }
}

/* Tablet */
@media (max-width: 900px) {
  h1 { font-size: 2.8rem; }
  h2 { font-size: 2rem; }
  section { padding: 80px 0; }

  .hero {
    padding: 160px 0 100px;
  }

  .features-grid {
    grid-template-columns: 1fr;
    max-width: 520px;
    margin: 0 auto;
  }

  .demo-layout {
    grid-template-columns: 1fr;
    gap: 48px;
  }

  .demo-layout--reverse {
    direction: ltr;
  }

  .demo-text {
    max-width: 100%;
    text-align: center;
  }

  .demo-label {
    margin-left: auto;
    margin-right: auto;
  }

  .steps {
    grid-template-columns: 1fr;
    max-width: 460px;
    gap: 40px;
  }

  .problem-hours,
  .problem-days {
    font-size: 3.5rem;
  }

  .problem-text {
    padding: 36px 32px;
  }
}

/* Mobile */
@media (max-width: 640px) {
  body { font-size: 16px; }
  h1 { font-size: 2.2rem; }
  h2 { font-size: 1.7rem; }
  section { padding: 64px 0; }

  .container { padding: 0 20px; }

  /* Mobile nav */
  .nav-links {
    display: none;
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    flex-direction: column;
    background: rgba(255,255,255,0.98);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--grey-200);
    padding: 20px 24px 28px;
    gap: 20px;
    box-shadow: var(--shadow-lg);
  }

  .nav-links.open {
    display: flex;
  }

  .nav-links a::after {
    display: none;
  }

  .nav-toggle {
    display: block;
  }

  .nav-toggle.open span:nth-child(1) {
    transform: rotate(45deg) translate(6px, 6px);
  }
  .nav-toggle.open span:nth-child(2) {
    opacity: 0;
  }
  .nav-toggle.open span:nth-child(3) {
    transform: rotate(-45deg) translate(6px, -6px);
  }

  /* Hero */
  .hero { 
    padding: 140px 0 80px; 
  }
  
  .hero h1 {
    line-height: 1.2;
  }
  
  .hero-subtitle { 
    font-size: 1.1rem; 
    margin-bottom: 40px;
  }

  .hero-cta-group {
    flex-direction: column;
    margin-bottom: 60px;
  }

  .btn-primary, .btn-secondary {
    width: 100%;
    justify-content: center;
    padding: 16px 32px;
    font-size: 1.05rem;
  }

  /* Problem */
  .problem-hours, 
  .problem-days { 
    font-size: 2.8rem; 
  }
  
  .problem-equals { 
    font-size: 2rem; 
  }
  
  .problem-headline {
    font-size: 1.2rem;
  }
  
  .problem-text {
    padding: 28px 24px;
  }
  
  .problem-text p { 
    font-size: 1.1rem; 
  }

  /* Features */
  .feature-card { 
    padding: 36px 28px; 
  }
  
  .feature-icon {
    width: 64px;
    height: 64px;
  }

  /* Demo sections */
  .demo-text h2 {
    font-size: 1.8rem;
  }

  /* Steps */
  .step {
    padding: 32px 24px;
  }

  .step-number {
    width: 56px;
    height: 56px;
    font-size: 1.3rem;
  }

  /* Bottom CTA */
  .bottom-cta h2 {
    font-size: 2.2rem;
  }

  /* Footer */
  .footer-content {
    flex-direction: column;
    align-items: flex-start;
    gap: 20px;
  }

  .footer-left { 
    flex-direction: column; 
    align-items: flex-start; 
    gap: 8px; 
  }

  /* Contact */
  .contact-card { 
    padding: 40px 28px; 
  }
  
  .contact-email {
    font-size: 1.1rem;
  }
}

/* Extra small mobile */
@media (max-width: 400px) {
  h1 { font-size: 1.9rem; }
  h2 { font-size: 1.5rem; }
  
  .problem-hours,
  .problem-days {
    font-size: 2.4rem;
  }
  
  .btn-primary,
  .btn-secondary {
    padding: 14px 28px;
    font-size: 1rem;
  }
}

/* Smooth scrolling for webkit browsers */
@media (prefers-reduced-motion: no-preference) {
  html {
    scroll-behavior: smooth;
  }
}