/* ===== CSS Variables ===== */
:root {
  --color-beige: #F5F1EB;
  --color-sand: #E8E2D9;
  --color-sand-dark: #D4CCC0;
  --color-charcoal: #2C2C2C;
  --color-charcoal-light: #3D3D3D;
  --color-white: #FFFFFF;
  --color-white-soft: #FAFAF9;
  --color-text: #1A1A1A;
  --color-text-muted: #6B6B6B;
  --color-text-light: #9A9A9A;
  --color-accent: #4A6CF7;
  --color-accent-light: #6B8AF9;
  
  --font-main: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-2xl: 4rem;
  --spacing-3xl: 6rem;
  
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.06);
  --shadow-lg: 0 8px 24px rgba(0,0,0,0.08);
  --shadow-xl: 0 16px 48px rgba(0,0,0,0.12);
  
  --transition-fast: 0.15s ease;
  --transition-base: 0.25s ease;
  --transition-slow: 0.4s ease;
}

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-main);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-beige);
}

img {
  max-width: 100%;
  height: auto;
}

a {
  text-decoration: none;
  color: inherit;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

ul {
  list-style: none;
}

/* ===== Container ===== */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

@media (min-width: 768px) {
  .container {
    padding: 0 var(--spacing-lg);
  }
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 500;
  border-radius: var(--radius-md);
  transition: all var(--transition-base);
  white-space: nowrap;
}

.btn-primary {
  background-color: var(--color-charcoal);
  color: var(--color-white);
  padding: 0.875rem 1.75rem;
  font-size: 0.9375rem;
}

.btn-primary:hover {
  background-color: var(--color-charcoal-light);
  transform: translateY(-1px);
}

.btn-sm {
  padding: 0.625rem 1.25rem;
  font-size: 0.875rem;
}

.btn-lg {
  padding: 1rem 2rem;
  font-size: 1rem;
}

.btn-full {
  width: 100%;
}

.btn-outline-light {
  background-color: transparent;
  color: var(--color-white);
  border: 1px solid rgba(255,255,255,0.3);
  padding: 0.75rem 1.5rem;
  font-size: 0.875rem;
}

.btn-outline-light:hover {
  background-color: rgba(255,255,255,0.1);
  border-color: rgba(255,255,255,0.5);
}

/* ===== Header ===== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background-color: rgba(245, 241, 235, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(0,0,0,0.05);
}

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

.logo {
  font-size: 1.25rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--color-charcoal);
}

.nav-desktop {
  display: none;
  align-items: center;
  gap: var(--spacing-lg);
}

.nav-link {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  transition: color var(--transition-fast);
}

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

.mobile-menu-btn {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
}

.mobile-menu-btn span {
  width: 20px;
  height: 2px;
  background-color: var(--color-charcoal);
  border-radius: 2px;
  transition: all var(--transition-fast);
}

.mobile-menu-btn.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.mobile-menu-btn.active span:nth-child(2) {
  opacity: 0;
}

.mobile-menu-btn.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

@media (min-width: 768px) {
  .nav-desktop {
    display: flex;
  }
  
  .mobile-menu-btn {
    display: none;
  }
}

/* ===== Mobile Menu ===== */
.mobile-menu {
  position: fixed;
  top: 72px;
  left: 0;
  right: 0;
  background-color: var(--color-beige);
  padding: var(--spacing-lg);
  z-index: 99;
  transform: translateY(-100%);
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-base);
}

.mobile-menu.active {
  transform: translateY(0);
  opacity: 1;
  visibility: visible;
}

.mobile-nav {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.mobile-nav-link {
  font-size: 1.125rem;
  padding: var(--spacing-sm) 0;
  border-bottom: 1px solid var(--color-sand);
}

@media (min-width: 768px) {
  .mobile-menu {
    display: none;
  }
}

/* ===== Hero Section ===== */
.hero {
  padding-top: calc(72px + var(--spacing-2xl));
  padding-bottom: var(--spacing-2xl);
  background: linear-gradient(180deg, var(--color-beige) 0%, var(--color-sand) 100%);
}

.hero-container {
  display: grid;
  gap: var(--spacing-xl);
  align-items: center;
}

.hero-content {
  text-align: center;
}

.tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--color-accent);
  background-color: rgba(74, 108, 247, 0.1);
  padding: 0.5rem 1rem;
  border-radius: 100px;
  margin-bottom: var(--spacing-md);
}

.hero-headline {
  font-size: clamp(2.5rem, 8vw, 4.5rem);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: -0.03em;
  color: var(--color-charcoal);
  margin-bottom: var(--spacing-md);
}

.hero-subheadline {
  font-size: clamp(1rem, 2.5vw, 1.25rem);
  color: var(--color-text-muted);
  max-width: 480px;
  margin: 0 auto var(--spacing-lg);
}

.hero-note {
  font-size: 0.875rem;
  color: var(--color-text-light);
  margin-top: var(--spacing-sm);
}

@media (min-width: 1024px) {
  .hero {
    padding-top: calc(72px + var(--spacing-3xl));
    padding-bottom: var(--spacing-3xl);
  }
  
  .hero-container {
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-3xl);
  }
  
  .hero-content {
    text-align: left;
  }
  
  .hero-subheadline {
    margin: 0 0 var(--spacing-lg);
  }
}

/* ===== Hero Card ===== */
.hero-card {
  background-color: var(--color-white);
  border-radius: var(--radius-xl);
  padding: var(--spacing-lg);
  box-shadow: var(--shadow-xl);
  animation: floatUp 0.8s ease-out;
}

@keyframes floatUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.card-tabs {
  display: flex;
  gap: var(--spacing-xs);
  margin-bottom: var(--spacing-md);
  flex-wrap: wrap;
}

.tab {
  font-size: 0.75rem;
  font-weight: 500;
  padding: 0.375rem 0.75rem;
  border-radius: 100px;
  background-color: var(--color-sand);
  color: var(--color-text-muted);
  transition: all var(--transition-fast);
}

.tab.active {
  background-color: var(--color-charcoal);
  color: var(--color-white);
}

.card-headline {
  font-size: 1.5rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  margin-bottom: var(--spacing-xs);
}

.card-subtext {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  margin-bottom: var(--spacing-md);
}

.card-bullets {
  margin-bottom: var(--spacing-lg);
}

.card-bullets li {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-sm);
  font-size: 0.9375rem;
  color: var(--color-text);
  margin-bottom: var(--spacing-sm);
}

.check-icon {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  color: var(--color-accent);
  margin-top: 2px;
}

.webinar-info {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-sm);
  padding: var(--spacing-md);
  background-color: var(--color-beige);
  border-radius: var(--radius-md);
  margin-bottom: var(--spacing-md);
}

.info-icon {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--color-white);
  border-radius: var(--radius-sm);
  flex-shrink: 0;
}

.info-icon svg {
  width: 20px;
  height: 20px;
  color: var(--color-charcoal);
}

.info-text {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.info-label {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.info-value {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text);
}

.preview-block {
  background: linear-gradient(135deg, var(--color-charcoal) 0%, var(--color-charcoal-light) 100%);
  border-radius: var(--radius-md);
  padding: var(--spacing-md);
  color: var(--color-white);
}

.preview-label {
  font-size: 0.625rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  opacity: 0.6;
  display: block;
  margin-bottom: var(--spacing-sm);
}

.preview-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-sm);
}

.preview-text {
  font-size: 0.875rem;
  font-weight: 500;
}

.play-btn {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--color-white);
  border-radius: 50%;
  color: var(--color-charcoal);
  transition: all var(--transition-base);
  flex-shrink: 0;
}

.play-btn svg {
  width: 16px;
  height: 16px;
  margin-left: 2px;
}

.play-btn:hover {
  transform: scale(1.05);
  box-shadow: 0 4px 16px rgba(255,255,255,0.3);
}

@media (min-width: 768px) {
  .hero-card {
    padding: var(--spacing-xl);
  }
  
  .card-headline {
    font-size: 1.75rem;
  }
}

/* ===== Info Panels ===== */
.info-panels {
  padding: var(--spacing-lg) 0;
}

.info-container {
  display: grid;
  gap: var(--spacing-md);
}

.info-panel {
  border-radius: var(--radius-xl);
  padding: var(--spacing-xl);
}

.info-panel-light {
  background-color: var(--color-sand);
}

.panel-title {
  font-size: 1.5rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  margin-bottom: var(--spacing-sm);
}

.panel-text {
  font-size: 1rem;
  color: var(--color-text-muted);
  margin-bottom: var(--spacing-md);
  max-width: 480px;
}

.panel-caption {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--color-text-light);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.info-panel-dark {
  background: linear-gradient(135deg, var(--color-charcoal) 0%, #1a1a1a 100%);
  color: var(--color-white);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
}

.panel-headline-dark {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.2;
}

.panel-subtext-dark {
  font-size: 1rem;
  opacity: 0.7;
  margin-top: var(--spacing-sm);
}

.panel-stats {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-lg);
}

.stat {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
}

.stat-value {
  font-size: 2rem;
  font-weight: 700;
}

.stat-label {
  font-size: 0.875rem;
  opacity: 0.7;
}

.avatars {
  display: flex;
}

.avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  border: 2px solid var(--color-charcoal);
  margin-left: -8px;
}

.avatar:first-child {
  margin-left: 0;
}

.avatar-1 {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.avatar-2 {
  background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
}

.avatar-3 {
  background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
}

@media (min-width: 768px) {
  .info-container {
    grid-template-columns: 1fr 1fr;
  }
  
  .panel-headline-dark {
    font-size: 1.75rem;
  }
}

@media (min-width: 1024px) {
  .info-panels {
    padding: var(--spacing-xl) 0;
  }
  
  .info-panel {
    padding: var(--spacing-2xl);
  }
  
  .panel-title,
  .panel-headline-dark {
    font-size: 2rem;
  }
}

/* ===== Section Styles ===== */
.section-header {
  text-align: center;
  max-width: 640px;
  margin: 0 auto var(--spacing-2xl);
}

.section-tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--color-accent);
  margin-bottom: var(--spacing-sm);
}

.section-headline {
  font-size: clamp(2rem, 5vw, 2.75rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  margin-bottom: var(--spacing-md);
}

.section-subtext {
  font-size: 1.125rem;
  color: var(--color-text-muted);
}

/* ===== Learn Section ===== */
.learn-section {
  padding: var(--spacing-3xl) 0;
  background-color: var(--color-white-soft);
}

.learn-grid {
  display: grid;
  gap: var(--spacing-md);
}

.learn-card {
  background-color: var(--color-white);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  transition: all var(--transition-base);
  border: 1px solid transparent;
}

.learn-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-sand);
}

.learn-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--color-beige);
  border-radius: var(--radius-md);
  margin-bottom: var(--spacing-md);
}

.learn-icon svg {
  width: 24px;
  height: 24px;
  color: var(--color-charcoal);
}

.learn-title {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: var(--spacing-xs);
}

.learn-desc {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  line-height: 1.6;
}

@media (min-width: 640px) {
  .learn-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .learn-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
  }
}

/* ===== Who Section ===== */
.who-section {
  padding: var(--spacing-3xl) 0;
  background-color: var(--color-beige);
}

.who-grid {
  display: grid;
  gap: var(--spacing-md);
}

.who-card {
  background-color: var(--color-white);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  text-align: center;
  transition: all var(--transition-base);
}

.who-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.who-icon {
  width: 64px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--color-beige) 0%, var(--color-sand) 100%);
  border-radius: 50%;
  margin: 0 auto var(--spacing-md);
}

.who-icon svg {
  width: 28px;
  height: 28px;
  color: var(--color-charcoal);
}

.who-title {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: var(--spacing-xs);
}

.who-desc {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  line-height: 1.6;
}

@media (min-width: 640px) {
  .who-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .who-grid {
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-lg);
  }
}

/* ===== Signup Section ===== */
.signup-section {
  padding: var(--spacing-3xl) 0;
  background: linear-gradient(180deg, var(--color-white-soft) 0%, var(--color-beige) 100%);
}

.signup-card {
  background-color: var(--color-white);
  border-radius: var(--radius-xl);
  padding: var(--spacing-xl);
  box-shadow: var(--shadow-xl);
  display: grid;
  gap: var(--spacing-xl);
}

.signup-headline {
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: var(--spacing-sm);
}

.signup-subtext {
  font-size: 1rem;
  color: var(--color-text-muted);
  margin-bottom: var(--spacing-lg);
}

.signup-info {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-md);
}

.signup-detail {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  font-size: 0.9375rem;
  color: var(--color-text);
}

.signup-detail svg {
  width: 20px;
  height: 20px;
  color: var(--color-accent);
}

.signup-form {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
}

.form-label {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text);
}

.form-input {
  padding: 0.875rem 1rem;
  font-size: 1rem;
  border: 1px solid var(--color-sand);
  border-radius: var(--radius-md);
  background-color: var(--color-white);
  transition: all var(--transition-fast);
  font-family: inherit;
}

.form-input:focus {
  outline: none;
  border-color: var(--color-charcoal);
  box-shadow: 0 0 0 3px rgba(44, 44, 44, 0.1);
}

.form-input::placeholder {
  color: var(--color-text-light);
}

.form-note {
  font-size: 0.8125rem;
  color: var(--color-text-light);
  text-align: center;
}

@media (min-width: 768px) {
  .signup-card {
    grid-template-columns: 1fr 1fr;
    padding: var(--spacing-2xl);
  }
  
  .signup-content {
    display: flex;
    flex-direction: column;
    justify-content: center;
  }
}

@media (min-width: 1024px) {
  .signup-card {
    max-width: 900px;
    margin: 0 auto;
    padding: var(--spacing-3xl);
  }
  
  .signup-headline {
    font-size: 2.5rem;
  }
}

/* ===== Footer ===== */
.footer {
  padding: var(--spacing-2xl) 0;
  background-color: var(--color-charcoal);
  color: var(--color-white);
}

.footer-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-lg);
  text-align: center;
}

.footer-brand .logo {
  color: var(--color-white);
  margin-bottom: var(--spacing-xs);
}

.footer-tagline {
  font-size: 0.875rem;
  opacity: 0.6;
}

.footer-links {
  display: flex;
  gap: var(--spacing-lg);
}

.footer-link {
  font-size: 0.875rem;
  opacity: 0.7;
  transition: opacity var(--transition-fast);
}

.footer-link:hover {
  opacity: 1;
}

.footer-copy {
  font-size: 0.8125rem;
  opacity: 0.5;
}

@media (min-width: 768px) {
  .footer-container {
    flex-direction: row;
    justify-content: space-between;
    text-align: left;
  }
  
  .footer-brand {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
  }
  
  .footer-brand .logo {
    margin-bottom: 0;
  }
}

/* ===== Animations ===== */
@media (prefers-reduced-motion: no-preference) {
  .learn-card,
  .who-card {
    opacity: 0;
    transform: translateY(20px);
    animation: fadeInUp 0.6s ease forwards;
  }
  
  .learn-card:nth-child(1) { animation-delay: 0.1s; }
  .learn-card:nth-child(2) { animation-delay: 0.2s; }
  .learn-card:nth-child(3) { animation-delay: 0.3s; }
  .learn-card:nth-child(4) { animation-delay: 0.4s; }
  .learn-card:nth-child(5) { animation-delay: 0.5s; }
  .learn-card:nth-child(6) { animation-delay: 0.6s; }
  
  .who-card:nth-child(1) { animation-delay: 0.1s; }
  .who-card:nth-child(2) { animation-delay: 0.2s; }
  .who-card:nth-child(3) { animation-delay: 0.3s; }
  .who-card:nth-child(4) { animation-delay: 0.4s; }
}

@keyframes fadeInUp {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ===== Utility Classes ===== */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}