/* ==========================================================================
   Respondo Landing Page - Master CSS Stylesheet
   Design System: Corporate Modern with Tactile Accents
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. Design System Tokens & Custom Properties
   -------------------------------------------------------------------------- */
:root {
  /* Surfaces & Backgrounds */
  --surface: #fbf8fb;
  --surface-dim: #dbd9dc;
  --surface-bright: #fbf8fb;
  --surface-container-lowest: #ffffff;
  --surface-container-low: #f5f3f5;
  --surface-container: #efedf0;
  --surface-container-high: #eae7ea;
  --surface-container-highest: #e4e2e4;
  --surface-muted: #F8FAFC;

  /* Text & Foreground Colors */
  --on-surface: #1b1b1d;
  --on-surface-variant: #45474d;
  --text-body: #334155;
  --inverse-surface: #303032;
  --inverse-on-surface: #f2f0f2;
  --outline: #75777e;
  --outline-variant: #c5c6ce;

  /* Brand Core Colors */
  --primary: #08162f;
  --on-primary: #ffffff;
  --primary-container: #1e2b45;
  --on-primary-container: #8592b2;
  --inverse-primary: #b9c6e8;
  --navy-deep: #1E2B45;

  /* Accent & Highlight Colors */
  --secondary: #006687;
  --on-secondary: #ffffff;
  --secondary-container: #60cdff;
  --on-secondary-container: #005572;
  --sky-bright: #5AC8FA;

  --tertiary: #001b16;
  --on-tertiary: #ffffff;
  --tertiary-container: #003229;
  --on-tertiary-container: #00a58d;
  --teal-accent: #4AD9BD;

  /* Status Colors */
  --error: #ba1a1a;
  --on-error: #ffffff;
  --error-container: #ffdad6;
  --on-error-container: #93000a;

  /* Typography Fonts */
  --font-display: 'Hanken Grotesk', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-body: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;

  /* Radius Tokens */
  --radius-sm: 0.25rem;    /* 4px */
  --radius-md: 0.5rem;     /* 8px */
  --radius-lg: 0.75rem;    /* 12px */
  --radius-xl: 1rem;       /* 16px */
  --radius-2xl: 1.5rem;    /* 24px */
  --radius-3xl: 2rem;      /* 32px */
  --radius-full: 9999px;

  /* Spacing Tokens */
  --container-max: 1280px;
  --gutter: 24px;
  --margin-mobile: 16px;
  --margin-desktop: 40px;

  /* Shadows */
  --shadow-sm: 0 2px 8px rgba(30, 43, 69, 0.04);
  --shadow-md: 0 4px 16px rgba(30, 43, 69, 0.08);
  --shadow-lg: 0 8px 30px rgba(30, 43, 69, 0.12);
  --shadow-glow-sky: 0 0 25px rgba(90, 200, 250, 0.35);
  --shadow-glow-teal: 0 0 25px rgba(74, 217, 189, 0.35);

  /* Transitions */
  --transition-fast: 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-normal: 0.35s cubic-bezier(0.16, 1, 0.3, 1);
}

/* --------------------------------------------------------------------------
   2. Reset & Global Base Styles
   -------------------------------------------------------------------------- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-body);
  background-color: var(--surface-muted);
  color: var(--text-body);
  line-height: 1.5;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

/* Typography Utility Classes */
h1, h2, h3, h4, h5, h6, .font-display {
  font-family: var(--font-display);
}

.text-primary { color: var(--primary); }
.text-on-surface-variant { color: var(--on-surface-variant); }
.text-teal { color: var(--teal-accent); }
.text-sky { color: var(--sky-bright); }

/* Layout Containers */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--margin-mobile);
  padding-right: var(--margin-mobile);
}

@media (min-width: 768px) {
  .container {
    padding-left: var(--margin-desktop);
    padding-right: var(--margin-desktop);
  }
}

/* --------------------------------------------------------------------------
   3. Header Navigation Bar
   -------------------------------------------------------------------------- */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background-color: rgba(251, 248, 251, 0.88);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(197, 198, 206, 0.25);
  transition: all var(--transition-fast);
}

.header.scrolled {
  box-shadow: var(--shadow-md);
  background-color: rgba(251, 248, 251, 0.96);
}

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

.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.brand-logo img {
  height: 36px;
  width: auto;
}

.brand-name {
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--primary);
  letter-spacing: -0.02em;
}

.nav-desktop {
  display: none;
  align-items: center;
  gap: 32px;
}

@media (min-width: 768px) {
  .nav-desktop {
    display: flex;
  }
}

.nav-link {
  font-family: var(--font-display);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--on-surface-variant);
  text-decoration: none;
  position: relative;
  padding: 8px 0;
  transition: color var(--transition-fast);
}

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

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0%;
  height: 2px;
  background: linear-gradient(90deg, var(--teal-accent), var(--sky-bright));
  transition: width var(--transition-fast);
  border-radius: 2px;
}

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

.nav-cta {
  padding: 8px 20px;
  background-color: var(--primary);
  color: var(--on-primary);
  border-radius: var(--radius-lg);
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.9rem;
  text-decoration: none;
  transition: all var(--transition-fast);
}

.nav-cta:hover {
  background-color: var(--navy-deep);
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
}

/* Mobile Toggle */
.mobile-menu-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  background: none;
  border: none;
  color: var(--on-surface);
  font-size: 28px;
  cursor: pointer;
  padding: 4px;
}

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

.mobile-nav-drawer {
  position: fixed;
  top: 72px;
  left: 0;
  width: 100%;
  background: var(--surface-container-lowest);
  border-bottom: 1px solid var(--outline-variant);
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  transform: translateY(-150%);
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal);
  box-shadow: var(--shadow-lg);
  z-index: 999;
}

.mobile-nav-drawer.open {
  transform: translateY(0);
  opacity: 1;
  visibility: visible;
}

.mobile-nav-link {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--on-surface);
  text-decoration: none;
  padding: 10px 0;
  border-bottom: 1px solid var(--surface-container);
}

/* --------------------------------------------------------------------------
   4. Hero Section
   -------------------------------------------------------------------------- */
.hero-section {
  position: relative;
  padding-top: 120px;
  padding-bottom: 80px;
  overflow: hidden;
  background-color: var(--surface);
}

@media (min-width: 1024px) {
  .hero-section {
    padding-top: 150px;
    padding-bottom: 120px;
  }
}

.hero-glow-bg {
  position: absolute;
  top: 40%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(74, 217, 189, 0.15) 0%, rgba(90, 200, 250, 0.12) 40%, rgba(251, 248, 251, 0) 70%);
  pointer-events: none;
  z-index: 0;
  filter: blur(40px);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 48px;
  align-items: center;
  position: relative;
  z-index: 1;
}

@media (min-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr 1.1fr;
    gap: 64px;
  }
}

.hero-content {
  display: flex;
  flex-direction: column;
  gap: 24px;
  text-align: center;
}

@media (min-width: 1024px) {
  .hero-content {
    text-align: left;
  }
}

.hero-header-block {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
}

@media (min-width: 640px) {
  .hero-header-block {
    flex-direction: row;
    align-items: flex-start;
  }
}

@media (min-width: 1024px) {
  .hero-header-block {
    align-items: center;
  }
}

.hero-mascot-wrapper {
  width: 140px;
  height: 140px;
  flex-shrink: 0;
  animation: floatMascot 4s ease-in-out infinite;
}

@media (min-width: 768px) {
  .hero-mascot-wrapper {
    width: 180px;
    height: 180px;
  }
}

.hero-mascot-wrapper img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

@keyframes floatMascot {
  0%, 100% { transform: translateY(0px); }
  50% { transform: translateY(-8px); }
}

.hero-title {
  font-family: var(--font-display);
  font-size: 2.25rem;
  font-weight: 800;
  color: var(--primary);
  line-height: 1.15;
  letter-spacing: -0.03em;
}

@media (min-width: 768px) {
  .hero-title {
    font-size: 3.25rem;
  }
}

.hero-description {
  font-size: 1.125rem;
  color: var(--on-surface-variant);
  max-width: 580px;
  line-height: 1.6;
}

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

@media (min-width: 1024px) {
  .hero-actions {
    justify-content: flex-start;
  }
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 14px 28px;
  border-radius: var(--radius-xl);
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
  border: 1px solid transparent;
  text-decoration: none;
}

.btn-primary {
  background-color: var(--primary);
  color: var(--on-primary);
  box-shadow: 0 4px 14px rgba(8, 22, 47, 0.2);
}

.btn-primary:hover {
  background-color: #0d2146;
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(8, 22, 47, 0.28);
}

.btn-outline {
  background-color: var(--surface-container-lowest);
  color: var(--primary);
  border-color: var(--outline-variant);
  box-shadow: var(--shadow-sm);
}

.btn-outline:hover {
  background-color: var(--surface-container-low);
  border-color: var(--outline);
  transform: translateY(-2px);
}

.btn-teal {
  background-color: var(--teal-accent);
  color: var(--primary);
  font-weight: 700;
}

.btn-teal:hover {
  background-color: #38c8ac;
  transform: translateY(-2px);
  box-shadow: var(--shadow-glow-teal);
}

/* --------------------------------------------------------------------------
   5. Interactive Chatbot Widget Mockup
   -------------------------------------------------------------------------- */
.chat-widget-card {
  background-color: var(--surface-container-lowest);
  border-radius: var(--radius-3xl);
  box-shadow: var(--shadow-lg);
  border: 1px solid rgba(197, 198, 206, 0.3);
  overflow: hidden;
  position: relative;
  z-index: 2;
  transition: box-shadow var(--transition-normal);
}

.chat-widget-card:hover {
  box-shadow: 0 16px 40px rgba(30, 43, 69, 0.16);
}

.chat-header {
  background-color: var(--navy-deep);
  padding: 16px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.chat-bot-info {
  display: flex;
  align-items: center;
  gap: 12px;
}

.bot-avatar-icon {
  width: 34px;
  height: 34px;
  background-color: var(--teal-accent);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary);
  font-size: 18px;
}

.bot-title-text {
  color: var(--on-primary);
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 600;
}

.bot-badge-live {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.75rem;
  background: rgba(74, 217, 189, 0.15);
  color: var(--teal-accent);
  padding: 3px 8px;
  border-radius: var(--radius-full);
  margin-left: 8px;
}

.live-dot {
  width: 6px;
  height: 6px;
  background-color: var(--teal-accent);
  border-radius: 50%;
  animation: pulseDot 2s infinite;
}

@keyframes pulseDot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.4; transform: scale(1.3); }
}

.chat-window-dots {
  display: flex;
  gap: 6px;
}

.chat-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background-color: rgba(255, 255, 255, 0.2);
}

.chat-body {
  background-color: var(--surface-muted);
  padding: 24px;
  min-height: 280px;
  max-height: 380px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

/* Messages */
.chat-msg-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.user-msg-group {
  align-items: flex-end;
}

.ai-msg-group {
  align-items: flex-start;
}

.user-bubble {
  background-color: var(--primary);
  color: var(--on-primary);
  padding: 14px 18px;
  border-radius: var(--radius-2xl) var(--radius-2xl) 0 var(--radius-2xl);
  max-width: 85%;
  font-size: 0.95rem;
  box-shadow: var(--shadow-sm);
}

.ai-bubble {
  background-color: var(--surface-container-lowest);
  color: var(--on-surface);
  padding: 16px 20px;
  border-radius: var(--radius-2xl) var(--radius-2xl) var(--radius-2xl) 0;
  max-width: 90%;
  font-size: 0.95rem;
  box-shadow: var(--shadow-sm);
  border: 1px solid rgba(197, 198, 206, 0.2);
}

.msg-meta {
  font-size: 0.75rem;
  color: var(--on-surface-variant);
  padding: 0 8px;
}

/* Source Document Chip */
.source-chip {
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px solid var(--surface-container);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background-color: rgba(74, 217, 189, 0.12);
  color: var(--primary);
  padding: 6px 12px;
  border-radius: var(--radius-lg);
  font-size: 0.825rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
}

.source-chip:hover {
  background-color: rgba(74, 217, 189, 0.25);
  transform: translateY(-1px);
}

.source-chip .material-symbols-outlined {
  font-size: 16px;
  color: #008772;
}

/* Preset Prompt Chips */
.chat-suggestions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 12px 20px;
  background-color: var(--surface-container-low);
  border-top: 1px solid var(--surface-container);
}

.suggestion-chip {
  font-family: var(--font-display);
  font-size: 0.8rem;
  font-weight: 500;
  background: var(--surface-container-lowest);
  color: var(--primary);
  border: 1px solid var(--outline-variant);
  padding: 6px 14px;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.suggestion-chip:hover {
  background: var(--primary);
  color: var(--on-primary);
  border-color: var(--primary);
}

/* Input Form */
.chat-footer {
  padding: 16px 20px;
  background-color: var(--surface-container-lowest);
  border-top: 1px solid var(--surface-container);
}

.chat-input-form {
  display: flex;
  align-items: center;
  position: relative;
}

.chat-input-field {
  width: 100%;
  background-color: var(--surface-container-low);
  border: 1px solid var(--outline-variant);
  border-radius: var(--radius-xl);
  padding: 12px 52px 12px 16px;
  font-family: var(--font-body);
  font-size: 0.95rem;
  color: var(--on-surface);
  outline: none;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.chat-input-field:focus {
  border-color: var(--teal-accent);
  box-shadow: 0 0 0 3px rgba(74, 217, 189, 0.2);
}

.chat-send-btn {
  position: absolute;
  right: 6px;
  width: 38px;
  height: 38px;
  background-color: var(--primary);
  color: var(--on-primary);
  border: none;
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.chat-send-btn:hover {
  background-color: var(--navy-deep);
  transform: scale(1.05);
}

/* Typing Indicator Animation */
.typing-indicator {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 8px;
}

.typing-dot {
  width: 6px;
  height: 6px;
  background-color: var(--outline);
  border-radius: 50%;
  animation: typingBounce 1.4s infinite ease-in-out;
}

.typing-dot:nth-child(2) { animation-delay: 0.2s; }
.typing-dot:nth-child(3) { animation-delay: 0.4s; }

@keyframes typingBounce {
  0%, 80%, 100% { transform: scale(0.6); opacity: 0.4; }
  40% { transform: scale(1.1); opacity: 1; }
}

/* --------------------------------------------------------------------------
   6. "Why Respondo?" Section
   -------------------------------------------------------------------------- */
.why-section {
  padding: 96px 0;
  background-color: var(--surface-container-low);
}

.section-header {
  text-align: center;
  max-width: 680px;
  margin: 0 auto 60px auto;
}

.section-title {
  font-family: var(--font-display);
  font-size: 2.25rem;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 12px;
  letter-spacing: -0.02em;
}

.section-subtitle {
  font-size: 1.1rem;
  color: var(--on-surface-variant);
}

.why-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

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

@media (min-width: 1024px) {
  .why-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

.why-card {
  background-color: var(--surface-container-lowest);
  padding: 32px 24px;
  border-radius: var(--radius-2xl);
  box-shadow: var(--shadow-sm);
  border: 1px solid rgba(197, 198, 206, 0.2);
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.why-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(74, 217, 189, 0.4);
}

.why-card-icon-bg {
  position: absolute;
  top: 12px;
  right: 12px;
  font-size: 72px;
  opacity: 0.06;
  pointer-events: none;
  transition: opacity var(--transition-fast);
}

.why-card:hover .why-card-icon-bg {
  opacity: 0.15;
}

.why-icon-badge {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-xl);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  font-size: 24px;
}

.badge-teal {
  background-color: rgba(74, 217, 189, 0.15);
  color: #007765;
}

.badge-sky {
  background-color: rgba(90, 200, 250, 0.15);
  color: #005572;
}

.badge-error {
  background-color: var(--error-container);
  color: var(--on-error-container);
}

.badge-navy {
  background-color: rgba(8, 22, 47, 0.1);
  color: var(--primary);
}

.why-card-title {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 10px;
}

.why-card-desc {
  font-size: 0.95rem;
  color: var(--on-surface-variant);
  line-height: 1.55;
}

/* --------------------------------------------------------------------------
   7. Features Section
   -------------------------------------------------------------------------- */
.features-section {
  padding: 96px 0;
  background-color: var(--surface);
}

.features-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

@media (min-width: 1024px) {
  .features-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.feature-card-large {
  grid-column: 1 / -1;
  background: linear-gradient(135deg, var(--navy-deep) 0%, #0d1b34 100%);
  border-radius: var(--radius-3xl);
  padding: 40px;
  color: var(--on-primary);
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  min-height: 280px;
}

@media (min-width: 1024px) {
  .feature-card-large {
    grid-column: span 2;
  }
}

.feature-large-glow {
  position: absolute;
  top: -40px;
  right: -40px;
  width: 260px;
  height: 260px;
  background: radial-gradient(circle, rgba(74, 217, 189, 0.3) 0%, rgba(74, 217, 189, 0) 70%);
  pointer-events: none;
  filter: blur(30px);
}

.feature-tag-badge {
  display: inline-block;
  padding: 4px 12px;
  background: rgba(255, 255, 255, 0.12);
  border-radius: var(--radius-full);
  font-family: var(--font-display);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--on-primary);
  margin-bottom: 16px;
  backdrop-filter: blur(4px);
}

.feature-card-large h3 {
  font-size: 1.85rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.feature-card-large p {
  color: rgba(255, 255, 255, 0.85);
  font-size: 1.05rem;
  max-width: 500px;
}

.feature-pills-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.feature-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 16px;
  background: rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-xl);
  backdrop-filter: blur(6px);
  font-family: var(--font-display);
  font-size: 0.9rem;
  font-weight: 500;
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.feature-card-small {
  background-color: var(--surface-container-lowest);
  border-radius: var(--radius-3xl);
  padding: 32px;
  box-shadow: var(--shadow-sm);
  border: 1px solid rgba(197, 198, 206, 0.2);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all var(--transition-normal);
}

.feature-card-small:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.feature-small-icon {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  margin-bottom: 20px;
}

.feature-card-small h3 {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 8px;
}

.feature-card-small p {
  font-size: 0.95rem;
  color: var(--on-surface-variant);
  line-height: 1.5;
}

.feature-footer-label {
  margin-top: 20px;
  padding-top: 16px;
  border-top: 1px solid var(--surface-container);
  font-family: var(--font-display);
  font-size: 0.825rem;
  font-weight: 600;
  color: var(--primary);
}

/* --------------------------------------------------------------------------
   8. "How It Works" Section
   -------------------------------------------------------------------------- */
.how-section {
  padding: 96px 0;
  background-color: var(--surface-container);
  border-top: 1px solid rgba(197, 198, 206, 0.2);
  border-bottom: 1px solid rgba(197, 198, 206, 0.2);
  position: relative;
  overflow: hidden;
}

.how-steps-container {
  display: flex;
  flex-direction: column;
  gap: 40px;
  position: relative;
  margin-top: 40px;
}

@media (min-width: 1024px) {
  .how-steps-container {
    flex-direction: row;
    justify-content: space-between;
    align-items: flex-start;
    gap: 20px;
  }

  .how-steps-container::before {
    content: '';
    position: absolute;
    top: 32px;
    left: 10%;
    width: 80%;
    height: 3px;
    background: linear-gradient(90deg, var(--teal-accent), var(--sky-bright), var(--primary));
    z-index: 0;
    border-radius: 2px;
  }
}

.how-step-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  position: relative;
  z-index: 1;
  flex: 1;
}

.step-num-bubble {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background-color: var(--surface-container);
  border: 4px solid var(--surface-container-lowest);
  box-shadow: var(--shadow-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--primary);
  margin-bottom: 16px;
  transition: all var(--transition-normal);
}

.how-step-item:hover .step-num-bubble {
  background-color: var(--teal-accent);
  color: var(--primary);
  transform: scale(1.1);
  box-shadow: var(--shadow-glow-teal);
}

.step-title {
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 6px;
}

.step-desc {
  font-size: 0.9rem;
  color: var(--on-surface-variant);
  max-width: 220px;
}

/* --------------------------------------------------------------------------
   9. Tech Stack Logos Section
   -------------------------------------------------------------------------- */
.tech-section {
  padding: 80px 0;
  background-color: var(--surface-container-lowest);
  border-bottom: 1px solid rgba(197, 198, 206, 0.2);
}

.tech-logos-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 48px;
  margin-top: 32px;
}

.tech-logo-card {
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 8px 24px;
  background: var(--surface-container-low);
  border-radius: var(--radius-xl);
  transition: all var(--transition-fast);
}

.tech-logo-card img {
  height: 40px;
  width: auto;
  filter: grayscale(30%);
  transition: filter var(--transition-fast);
}

.tech-logo-card:hover {
  transform: translateY(-3px);
  background: var(--surface-container-lowest);
  box-shadow: var(--shadow-sm);
}

.tech-logo-card:hover img {
  filter: grayscale(0%);
}

/* --------------------------------------------------------------------------
   10. Contact & Newsletter Section
   -------------------------------------------------------------------------- */
.contact-section {
  padding: 96px 0;
  background-color: var(--surface-container-low);
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
}

@media (min-width: 1024px) {
  .contact-grid {
    grid-template-columns: 1fr 1fr;
  }
}

.contact-card-info {
  background-color: var(--surface-container-lowest);
  border-radius: var(--radius-3xl);
  padding: 40px;
  box-shadow: var(--shadow-md);
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.creator-profile {
  display: flex;
  align-items: center;
  gap: 16px;
}

.creator-avatar {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  overflow: hidden;
  border: 2px solid var(--sky-bright);
}

.creator-avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.social-links {
  display: flex;
  gap: 12px;
}

.social-btn {
  flex: 1;
  padding: 12px;
  background-color: var(--surface-container-low);
  border-radius: var(--radius-xl);
  text-align: center;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--primary);
  text-decoration: none;
  transition: all var(--transition-fast);
}

.social-btn:hover {
  background-color: var(--primary);
  color: var(--on-primary);
}

.newsletter-card {
  background-color: var(--navy-deep);
  border-radius: var(--radius-3xl);
  padding: 40px;
  color: var(--on-primary);
  box-shadow: var(--shadow-lg);
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.newsletter-card h3 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.newsletter-card p {
  color: rgba(255, 255, 255, 0.8);
  margin-bottom: 24px;
  font-size: 0.95rem;
}

.newsletter-form {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.newsletter-input {
  width: 100%;
  padding: 14px 20px;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-xl);
  color: var(--on-primary);
  font-family: var(--font-body);
  font-size: 1rem;
  outline: none;
  transition: border-color var(--transition-fast);
}

.newsletter-input::placeholder {
  color: rgba(255, 255, 255, 0.4);
}

.newsletter-input:focus {
  border-color: var(--teal-accent);
  box-shadow: 0 0 0 3px rgba(74, 217, 189, 0.25);
}

/* --------------------------------------------------------------------------
   11. Footer
   -------------------------------------------------------------------------- */
.footer {
  background-color: var(--surface-container-low);
  padding: 32px 0;
  border-top: 1px solid rgba(197, 198, 206, 0.2);
}

.footer-inner {
  display: flex;
  flex-direction: column-reverse;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

@media (min-width: 768px) {
  .footer-inner {
    flex-direction: row;
  }
}

.copyright-text {
  font-size: 0.875rem;
  color: var(--on-surface-variant);
}

.footer-icons {
  display: flex;
  gap: 20px;
}

.footer-icon-link {
  color: var(--on-surface-variant);
  transition: color var(--transition-fast);
  text-decoration: none;
}

.footer-icon-link:hover {
  color: var(--primary);
}

/* --------------------------------------------------------------------------
   12. Interactive Modal & Drawer System
   -------------------------------------------------------------------------- */
.modal-overlay {
  position: fixed;
  inset: 0;
  background-color: rgba(8, 22, 47, 0.6);
  backdrop-filter: blur(6px);
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal);
}

.modal-overlay.active {
  opacity: 1;
  visibility: visible;
}

.modal-dialog {
  background-color: var(--surface-container-lowest);
  border-radius: var(--radius-3xl);
  max-width: 600px;
  width: 100%;
  padding: 32px;
  box-shadow: var(--shadow-lg);
  transform: translateY(20px) scale(0.95);
  transition: all var(--transition-normal);
  position: relative;
}

.modal-overlay.active .modal-dialog {
  transform: translateY(0) scale(1);
}

.modal-close-btn {
  position: absolute;
  top: 20px;
  right: 20px;
  background: var(--surface-container-low);
  border: none;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--on-surface);
}

.modal-close-btn:hover {
  background: var(--surface-container);
}

/* Source Document Drawer */
.source-drawer {
  position: fixed;
  bottom: 0;
  right: 0;
  width: 100%;
  max-width: 480px;
  height: 100vh;
  background-color: var(--surface-container-lowest);
  box-shadow: -8px 0 30px rgba(0,0,0,0.15);
  z-index: 2005;
  transform: translateX(100%);
  transition: transform var(--transition-normal);
  display: flex;
  flex-direction: column;
}

.source-drawer.open {
  transform: translateX(0);
}

.drawer-header {
  padding: 20px;
  background: var(--navy-deep);
  color: var(--on-primary);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.drawer-body {
  padding: 24px;
  overflow-y: auto;
  flex: 1;
}

.doc-snippet-box {
  background: var(--surface-muted);
  border: 1px solid var(--outline-variant);
  border-radius: var(--radius-xl);
  padding: 16px;
  font-family: monospace;
  font-size: 0.875rem;
  color: var(--text-body);
  line-height: 1.6;
  margin-top: 12px;
}

.highlight-match {
  background-color: rgba(74, 217, 189, 0.4);
  font-weight: bold;
  padding: 2px 4px;
  border-radius: 4px;
}

/* Toast Notifications */
.toast-container {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 3000;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.toast {
  background-color: var(--primary);
  color: var(--on-primary);
  padding: 14px 20px;
  border-radius: var(--radius-xl);
  font-family: var(--font-display);
  font-size: 0.9rem;
  font-weight: 500;
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  gap: 10px;
  transform: translateY(30px);
  opacity: 0;
  transition: all var(--transition-fast);
}

.toast.show {
  transform: translateY(0);
  opacity: 1;
}

/* Scroll Reveal Observer Animation */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s cubic-bezier(0.16, 1, 0.3, 1), transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

.reveal.active {
  opacity: 1;
  transform: translateY(0);
}