/* ============================================
   ALPR - AI Learning Process Record
   GitHub Pages Site Styles
   ============================================ */

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

:root {
  --color-bg: #0a0e1a;
  --color-bg-alt: #111827;
  --color-bg-card: #1a2035;
  --color-bg-card-hover: #1f2945;
  --color-primary: #6366f1;
  --color-primary-light: #818cf8;
  --color-primary-dark: #4f46e5;
  --color-secondary: #06b6d4;
  --color-secondary-light: #22d3ee;
  --color-accent: #f59e0b;
  --color-accent-light: #fbbf24;
  --color-success: #10b981;
  --color-danger: #ef4444;
  --color-text: #e2e8f0;
  --color-text-secondary: #94a3b8;
  --color-text-muted: #64748b;
  --color-border: #1e293b;
  --color-border-light: #334155;
  --font-heading: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
  --radius: 12px;
  --radius-sm: 8px;
  --radius-lg: 20px;
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.4);
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-body);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

/* --- Typography --- */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

h1 { font-size: clamp(2.5rem, 5vw, 4rem); }
h2 { font-size: clamp(1.8rem, 3.5vw, 2.8rem); }
h3 { font-size: clamp(1.3rem, 2.5vw, 1.6rem); }
h4 { font-size: 1.15rem; }

p {
  color: var(--color-text-secondary);
  max-width: 70ch;
}

a {
  color: var(--color-primary-light);
  text-decoration: none;
  transition: color var(--transition);
}

a:hover { color: var(--color-secondary-light); }

/* --- Layout --- */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.container--wide {
  max-width: 1400px;
}

section {
  padding: 6rem 0;
  position: relative;
}

section:nth-child(even) {
  background: var(--color-bg-alt);
}

/* --- Navigation --- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 1rem 0;
  transition: all var(--transition);
  background: transparent;
}

.nav.scrolled {
  background: rgba(10, 14, 26, 0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--color-border);
  padding: 0.7rem 0;
}

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

.nav__logo {
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--color-text);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.nav__logo-icon {
  width: 32px;
  height: 32px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
}

.nav__links {
  display: flex;
  list-style: none;
  gap: 0.25rem;
}

.nav__links a {
  color: var(--color-text-secondary);
  padding: 0.5rem 1rem;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 500;
  transition: all var(--transition);
}

.nav__links a:hover,
.nav__links a.active {
  color: var(--color-text);
  background: rgba(99, 102, 241, 0.1);
}

.nav__cta {
  background: var(--color-primary) !important;
  color: white !important;
  padding: 0.5rem 1.25rem !important;
  border-radius: var(--radius-sm) !important;
}

.nav__cta:hover {
  background: var(--color-primary-dark) !important;
}

.nav__mobile-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--color-text);
  font-size: 1.5rem;
  cursor: pointer;
  padding: 0.5rem;
}

/* --- Hero --- */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: 5rem;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -25%;
  width: 150%;
  height: 150%;
  background: radial-gradient(ellipse at 30% 50%, rgba(99, 102, 241, 0.08) 0%, transparent 60%),
              radial-gradient(ellipse at 70% 30%, rgba(6, 182, 212, 0.06) 0%, transparent 50%);
  pointer-events: none;
}

.hero .container {
  max-width: 1400px;
  position: relative;
  z-index: 1;
}

.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: rgba(99, 102, 241, 0.1);
  border: 1px solid rgba(99, 102, 241, 0.2);
  border-radius: 999px;
  padding: 0.4rem 1rem;
  font-size: 0.85rem;
  color: var(--color-primary-light);
  font-weight: 500;
  margin-bottom: 1.5rem;
}

.hero__badge-dot {
  width: 6px;
  height: 6px;
  background: var(--color-success);
  border-radius: 50%;
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

.hero__title {
  margin-bottom: 1.5rem;
}

.hero__title span {
  background: linear-gradient(135deg, var(--color-primary-light), var(--color-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero__subtitle {
  font-size: 1.25rem;
  line-height: 1.8;
  margin-bottom: 2rem;
  max-width: 720px;
}

.hero__actions {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.hero__visual {
  display: flex;
  justify-content: center;
  align-items: center;
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.85rem 1.75rem;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  border: none;
  transition: all var(--transition);
  text-decoration: none;
  white-space: nowrap;
}

.btn--primary {
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
  color: white;
  box-shadow: 0 4px 16px rgba(99, 102, 241, 0.3);
}

.btn--primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(99, 102, 241, 0.4);
  color: white;
}

.btn--secondary {
  background: rgba(255, 255, 255, 0.05);
  color: var(--color-text);
  border: 1px solid var(--color-border-light);
}

.btn--secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: var(--color-primary-light);
  color: white;
}

.btn--outline {
  background: transparent;
  color: var(--color-primary-light);
  border: 2px solid var(--color-primary);
}

.btn--outline:hover {
  background: var(--color-primary);
  color: white;
}

/* --- Section Headers --- */
.section-header {
  text-align: center;
  margin-bottom: 4rem;
}

.section-header__label {
  display: inline-block;
  color: var(--color-primary-light);
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 0.75rem;
}

.section-header h2 {
  margin-bottom: 1rem;
}

.section-header p {
  margin: 0 auto;
  font-size: 1.1rem;
}

/* --- Problem Section --- */
.problem__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  margin-bottom: 3rem;
}

.problem__card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 2rem;
  transition: all var(--transition);
}

.problem__card:hover {
  border-color: var(--color-border-light);
  transform: translateY(-4px);
  box-shadow: var(--shadow);
}

.problem__card-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 1.25rem;
}

.problem__card-icon--red {
  background: rgba(239, 68, 68, 0.1);
}

.problem__card-icon--amber {
  background: rgba(245, 158, 11, 0.1);
}

.problem__card-icon--blue {
  background: rgba(99, 102, 241, 0.1);
}

.problem__card h4 {
  margin-bottom: 0.75rem;
  color: var(--color-text);
}

.problem__card p {
  font-size: 0.95rem;
}

.problem__contrast {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 2rem;
  align-items: center;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
}

.problem__old, .problem__new {
  padding: 1.5rem;
}

.problem__old h4 {
  color: var(--color-danger);
  margin-bottom: 1rem;
}

.problem__new h4 {
  color: var(--color-success);
  margin-bottom: 1rem;
}

.problem__old ul, .problem__new ul {
  list-style: none;
}

.problem__old li, .problem__new li {
  padding: 0.4rem 0;
  color: var(--color-text-secondary);
  font-size: 0.95rem;
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
}

.problem__old li::before {
  content: '\2717';
  color: var(--color-danger);
  font-weight: bold;
  flex-shrink: 0;
}

.problem__new li::before {
  content: '\2713';
  color: var(--color-success);
  font-weight: bold;
  flex-shrink: 0;
}

.problem__arrow {
  font-size: 2rem;
  color: var(--color-primary-light);
}

/* --- How It Works --- */
.how__layers {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  margin-bottom: 3rem;
}

.how__layer {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 2rem;
  position: relative;
  overflow: hidden;
  transition: all var(--transition);
}

.how__layer:hover {
  border-color: var(--color-primary);
  transform: translateY(-4px);
  box-shadow: var(--shadow);
}

.how__layer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
}

.how__layer--1::before { background: linear-gradient(90deg, var(--color-secondary), var(--color-primary)); }
.how__layer--2::before { background: linear-gradient(90deg, var(--color-primary), var(--color-accent)); }
.how__layer--3::before { background: linear-gradient(90deg, var(--color-accent), var(--color-success)); }

.how__layer-number {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.9rem;
  margin-bottom: 1.25rem;
}

.how__layer--1 .how__layer-number { background: rgba(6, 182, 212, 0.15); color: var(--color-secondary-light); }
.how__layer--2 .how__layer-number { background: rgba(99, 102, 241, 0.15); color: var(--color-primary-light); }
.how__layer--3 .how__layer-number { background: rgba(245, 158, 11, 0.15); color: var(--color-accent-light); }

.how__layer h3 {
  margin-bottom: 0.75rem;
}

.how__layer p {
  font-size: 0.95rem;
  margin-bottom: 1rem;
}

.how__layer-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.how__layer-tag {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--color-border);
  border-radius: 999px;
  padding: 0.25rem 0.75rem;
  font-size: 0.8rem;
  color: var(--color-text-muted);
  font-family: var(--font-mono);
}

/* --- Dimensions Section --- */
.dimensions__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.dimension__card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 2rem;
  transition: all var(--transition);
  cursor: default;
}

.dimension__card:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow);
}

.dimension__icon {
  font-size: 2rem;
  margin-bottom: 1rem;
}

.dimension__card h4 {
  color: var(--color-text);
  margin-bottom: 0.5rem;
}

.dimension__card p {
  font-size: 0.9rem;
  margin-bottom: 1rem;
}

.dimension__metrics {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.dimension__metric {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  padding-left: 1rem;
  position: relative;
}

.dimension__metric::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--color-primary);
  transform: translateY(-50%);
}

/* --- Use Cases --- */
.usecases__tabs {
  display: flex;
  justify-content: center;
  gap: 0.5rem;
  margin-bottom: 3rem;
  flex-wrap: wrap;
}

.usecases__tab {
  padding: 0.65rem 1.5rem;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--color-border);
  color: var(--color-text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
}

.usecases__tab:hover {
  border-color: var(--color-primary);
  color: var(--color-text);
}

.usecases__tab.active {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: white;
}

.usecases__panel {
  display: none;
  animation: fadeIn 0.4s ease;
}

.usecases__panel.active {
  display: block;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.usecase__hero {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: start;
  margin-bottom: 3rem;
}

.usecase__intro h3 {
  font-size: 1.8rem;
  margin-bottom: 1rem;
}

.usecase__intro > p {
  font-size: 1.05rem;
  margin-bottom: 1.5rem;
}

.usecase__highlight-box {
  background: rgba(99, 102, 241, 0.05);
  border: 1px solid rgba(99, 102, 241, 0.15);
  border-radius: var(--radius);
  padding: 1.5rem;
}

.usecase__highlight-box h4 {
  color: var(--color-primary-light);
  margin-bottom: 0.75rem;
  font-size: 1rem;
}

.usecase__highlight-box p {
  font-size: 0.95rem;
}

.usecase__scenarios {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.scenario__card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.75rem;
  transition: all var(--transition);
}

.scenario__card:hover {
  border-color: var(--color-border-light);
  box-shadow: var(--shadow);
}

.scenario__card-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.scenario__card-icon {
  font-size: 1.5rem;
}

.scenario__card h4 {
  color: var(--color-text);
  font-size: 1rem;
}

.scenario__card > p {
  font-size: 0.9rem;
  margin-bottom: 1rem;
}

.scenario__persona {
  background: rgba(255, 255, 255, 0.03);
  border-radius: var(--radius-sm);
  padding: 1rem;
  margin-bottom: 1rem;
}

.scenario__persona-name {
  font-weight: 600;
  color: var(--color-text);
  font-size: 0.9rem;
  margin-bottom: 0.25rem;
}

.scenario__persona-desc {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  font-style: italic;
}

.scenario__steps {
  list-style: none;
  counter-reset: step;
}

.scenario__steps li {
  counter-increment: step;
  padding: 0.5rem 0 0.5rem 2rem;
  position: relative;
  font-size: 0.9rem;
  color: var(--color-text-secondary);
}

.scenario__steps li::before {
  content: counter(step);
  position: absolute;
  left: 0;
  top: 0.5rem;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: rgba(99, 102, 241, 0.15);
  color: var(--color-primary-light);
  font-size: 0.7rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
}

.usecase__benefits {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
}

.benefit__item {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 1.25rem;
  text-align: center;
  transition: all var(--transition);
}

.benefit__item:hover {
  border-color: var(--color-success);
}

.benefit__icon {
  font-size: 1.5rem;
  margin-bottom: 0.5rem;
}

.benefit__item h5 {
  font-size: 0.9rem;
  color: var(--color-text);
  margin-bottom: 0.35rem;
}

.benefit__item p {
  font-size: 0.8rem;
  color: var(--color-text-muted);
}

/* --- Demo / Visualization --- */
.demo__container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  align-items: start;
}

.demo__radar-wrapper {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 2rem;
}

.demo__radar-wrapper h3 {
  text-align: center;
  margin-bottom: 0.5rem;
  font-size: 1.1rem;
}

.demo__radar-subtitle {
  text-align: center;
  font-size: 0.85rem;
  color: var(--color-text-muted);
  margin-bottom: 1.5rem;
}

#radarCanvas {
  display: block;
  margin: 0 auto;
}

.demo__radar-controls {
  display: flex;
  justify-content: center;
  gap: 0.75rem;
  margin-top: 1.5rem;
  flex-wrap: wrap;
}

.demo__radar-btn {
  padding: 0.4rem 1rem;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--color-border);
  color: var(--color-text-secondary);
  font-size: 0.8rem;
  cursor: pointer;
  transition: all var(--transition);
  font-family: var(--font-body);
}

.demo__radar-btn:hover,
.demo__radar-btn.active {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: white;
}

.demo__timeline {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 2rem;
}

.demo__timeline h3 {
  margin-bottom: 0.5rem;
  font-size: 1.1rem;
}

.demo__timeline-subtitle {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  margin-bottom: 1.5rem;
}

.demo__episode {
  border-left: 2px solid var(--color-border-light);
  padding-left: 1.5rem;
  margin-bottom: 1.5rem;
  position: relative;
}

.demo__episode::before {
  content: '';
  position: absolute;
  left: -6px;
  top: 4px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--color-primary);
}

.demo__episode-date {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  margin-bottom: 0.25rem;
}

.demo__episode-title {
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 0.25rem;
}

.demo__episode-type {
  display: inline-block;
  font-size: 0.75rem;
  padding: 0.15rem 0.6rem;
  border-radius: 999px;
  background: rgba(99, 102, 241, 0.1);
  color: var(--color-primary-light);
  margin-bottom: 0.5rem;
}

.demo__episode p {
  font-size: 0.85rem;
}

.demo__episode-dimensions {
  display: flex;
  gap: 0.5rem;
  margin-top: 0.75rem;
  flex-wrap: wrap;
}

.demo__episode-dim {
  font-size: 0.7rem;
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
  background: rgba(16, 185, 129, 0.1);
  color: var(--color-success);
}

/* --- Privacy Section --- */
.privacy__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2rem;
}

.privacy__card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 2rem;
}

.privacy__card h4 {
  color: var(--color-text);
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.privacy__list {
  list-style: none;
}

.privacy__list li {
  padding: 0.5rem 0;
  color: var(--color-text-secondary);
  font-size: 0.95rem;
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
}

.privacy__list-icon {
  color: var(--color-success);
  font-weight: bold;
  flex-shrink: 0;
  margin-top: 2px;
}

.privacy__contrast {
  margin-top: 3rem;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
}

.privacy__do, .privacy__dont {
  background: var(--color-bg-card);
  border-radius: var(--radius);
  padding: 1.5rem;
}

.privacy__do {
  border: 1px solid rgba(16, 185, 129, 0.2);
}

.privacy__dont {
  border: 1px solid rgba(239, 68, 68, 0.2);
}

.privacy__do h4 { color: var(--color-success); margin-bottom: 1rem; }
.privacy__dont h4 { color: var(--color-danger); margin-bottom: 1rem; }

.privacy__do li::before { content: '\2713'; color: var(--color-success); }
.privacy__dont li::before { content: '\2717'; color: var(--color-danger); }

.privacy__do ul, .privacy__dont ul {
  list-style: none;
}

.privacy__do li, .privacy__dont li {
  padding: 0.4rem 0;
  padding-left: 1.5rem;
  position: relative;
  color: var(--color-text-secondary);
  font-size: 0.9rem;
}

.privacy__do li::before, .privacy__dont li::before {
  position: absolute;
  left: 0;
  font-weight: bold;
}

/* --- Standards Section --- */
.standards__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.standard__card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.75rem;
  text-align: center;
  transition: all var(--transition);
}

.standard__card:hover {
  border-color: var(--color-border-light);
}

.standard__card h4 {
  color: var(--color-primary-light);
  margin-bottom: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.95rem;
}

.standard__card p {
  font-size: 0.85rem;
  margin: 0 auto;
}

/* --- Roadmap --- */
.roadmap__timeline {
  position: relative;
  max-width: 800px;
  margin: 0 auto;
}

.roadmap__timeline::before {
  content: '';
  position: absolute;
  left: 50%;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--color-primary), var(--color-secondary), var(--color-success));
  transform: translateX(-50%);
}

.roadmap__item {
  display: flex;
  align-items: flex-start;
  margin-bottom: 3rem;
  position: relative;
}

.roadmap__item:nth-child(odd) {
  flex-direction: row;
  padding-right: calc(50% + 2rem);
  text-align: right;
}

.roadmap__item:nth-child(even) {
  flex-direction: row-reverse;
  padding-left: calc(50% + 2rem);
}

.roadmap__dot {
  position: absolute;
  left: 50%;
  top: 0.5rem;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--color-primary);
  border: 3px solid var(--color-bg);
  transform: translateX(-50%);
  z-index: 1;
}

.roadmap__content {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.5rem;
}

.roadmap__date {
  font-size: 0.8rem;
  color: var(--color-primary-light);
  font-weight: 600;
  font-family: var(--font-mono);
  margin-bottom: 0.5rem;
}

.roadmap__content h4 {
  color: var(--color-text);
  margin-bottom: 0.5rem;
}

.roadmap__content p {
  font-size: 0.9rem;
}

/* --- FAQ --- */
.faq__grid {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.faq__item {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: all var(--transition);
}

.faq__item.open {
  border-color: var(--color-primary);
}

.faq__question {
  padding: 1.25rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  user-select: none;
}

.faq__question h4 {
  color: var(--color-text);
  font-size: 1rem;
}

.faq__toggle {
  font-size: 1.25rem;
  color: var(--color-text-muted);
  transition: transform var(--transition);
}

.faq__item.open .faq__toggle {
  transform: rotate(45deg);
  color: var(--color-primary-light);
}

.faq__answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease;
}

.faq__answer-inner {
  padding: 0 1.5rem 1.5rem;
}

.faq__answer-inner p {
  font-size: 0.95rem;
}

/* --- CTA Section --- */
.cta {
  text-align: center;
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.1) 0%, rgba(6, 182, 212, 0.05) 100%);
}

.cta h2 {
  margin-bottom: 1rem;
}

.cta p {
  margin: 0 auto 2rem;
  font-size: 1.1rem;
}

.cta__actions {
  display: flex;
  justify-content: center;
  gap: 1rem;
  flex-wrap: wrap;
}

/* --- Footer --- */
.footer {
  border-top: 1px solid var(--color-border);
  padding: 3rem 0;
}

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

.footer__text {
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

.footer__links {
  display: flex;
  gap: 1.5rem;
  list-style: none;
}

.footer__links a {
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

.footer__links a:hover {
  color: var(--color-primary-light);
}

/* --- Animations --- */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* --- Responsive --- */
@media (max-width: 1024px) {
  .hero .container {
    text-align: center;
  }

  .hero__subtitle { margin: 0 auto 2rem; }
  .hero__actions { justify-content: center; }

  .problem__grid { grid-template-columns: 1fr; }
  .how__layers { grid-template-columns: 1fr; }
  .dimensions__grid { grid-template-columns: repeat(2, 1fr); }

  .usecase__hero { grid-template-columns: 1fr; }
  .usecase__scenarios { grid-template-columns: 1fr; }
  .usecase__benefits { grid-template-columns: repeat(2, 1fr); }

  .demo__container { grid-template-columns: 1fr; }
  .privacy__grid { grid-template-columns: 1fr; }
  .privacy__contrast { grid-template-columns: 1fr; }
  .standards__grid { grid-template-columns: repeat(2, 1fr); }

  .problem__contrast { grid-template-columns: 1fr; }
  .problem__arrow { text-align: center; transform: rotate(90deg); }

  .roadmap__timeline::before { left: 1rem; }
  .roadmap__item:nth-child(odd),
  .roadmap__item:nth-child(even) {
    flex-direction: row;
    padding-left: 3rem;
    padding-right: 0;
    text-align: left;
  }
  .roadmap__dot { left: 1rem; }
}

@media (max-width: 768px) {
  section { padding: 4rem 0; }

  .nav__links { display: none; }
  .nav__mobile-toggle { display: block; }

  .nav__links.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: rgba(10, 14, 26, 0.98);
    backdrop-filter: blur(16px);
    padding: 1rem;
    border-bottom: 1px solid var(--color-border);
  }

  .dimensions__grid { grid-template-columns: 1fr; }
  .usecase__benefits { grid-template-columns: 1fr; }
  .standards__grid { grid-template-columns: 1fr; }

  .footer .container {
    flex-direction: column;
    gap: 1rem;
    text-align: center;
  }
}