/* ============================================
   ISRmes Design System v2.0
   Based on shadcn/ui — clinical blueprint
   Light theme, monochromatic, Geist-inspired
   ============================================ */

:root {
  /* Colors */
  --color-canvas: #f5f5f5;
  --color-paper: #ffffff;
  --color-surface-alt: #fafafa;
  --color-ink: #0a0a0a;
  --color-ink-soft: #171717;
  --color-mid-gray: #737373;
  --color-hairline: #e5e5e5;
  --color-ember: #e7000b;
  --color-violet: #af50ff;
  --color-violet-soft: #e1bdff;

  /* Typography */
  --font-primary: 'Inter', ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;

  /* Spacing */
  --spacing-unit: 4px;
  --page-max-width: 1280px;
  --section-gap: 64px;
  --card-padding: 20px;

  /* Border Radius */
  --radius-cards: 24px;
  --radius-small: 6px;
  --radius-badges: 18px;
  --radius-inputs: 18px;
  --radius-nested: 10px;
  --radius-buttons: 18px;

  /* Shadows */
  --shadow-card: 0 0 0 1px rgba(23,23,23,0.05), 0 1px 3px rgba(0,0,0,0.1), 0 1px 2px -1px rgba(0,0,0,0.1);
  --shadow-subtle: rgba(16, 24, 40, 0.05) 0px 1px 2px 0px;
}

/* Reset */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: var(--font-primary);
  background-color: var(--color-canvas);
  color: var(--color-ink);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

::selection { background: rgba(175, 80, 255, 0.15); color: var(--color-ink); }

/* Scrollbar */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--color-canvas); }
::-webkit-scrollbar-thumb { background: var(--color-hairline); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--color-mid-gray); }

/* ============================================
   LAYOUT
   ============================================ */

.container {
  max-width: var(--page-max-width);
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: var(--section-gap) 0;
  position: relative;
}

.section-sm { padding: 32px 0; }

/* ============================================
   NAVIGATION
   ============================================ */

.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-hairline);
  transition: all 0.3s ease;
}

.nav-inner {
  max-width: var(--page-max-width);
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.nav-brand {
  font-family: var(--font-primary);
  font-weight: 600;
  font-size: 18px;
  color: var(--color-ink);
  text-decoration: none;
  letter-spacing: -0.02em;
  display: flex;
  align-items: center;
  gap: 10px;
}

.nav-brand .brand-dot {
  width: 8px; height: 8px;
  background: var(--color-violet);
  border-radius: 50%;
  display: inline-block;
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.6; transform: scale(1.2); }
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 8px;
  list-style: none;
}

.nav-links a {
  font-family: var(--font-primary);
  font-size: 14px;
  font-weight: 500;
  color: var(--color-mid-gray);
  text-decoration: none;
  padding: 8px 12px;
  border-radius: var(--radius-buttons);
  transition: all 0.2s ease;
}

.nav-links a:hover {
  color: var(--color-ink);
  background: var(--color-surface-alt);
}

.nav-links a.active {
  color: var(--color-ink);
  background: var(--color-surface-alt);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* ============================================
   BUTTONS
   ============================================ */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-family: var(--font-primary);
  font-size: 14px;
  font-weight: 500;
  text-decoration: none;
  cursor: pointer;
  transition: all 0.2s ease;
  border: none;
  outline: none;
  height: 40px;
  padding: 0 16px;
  border-radius: var(--radius-buttons);
  white-space: nowrap;
}

.btn-primary {
  background: var(--color-ink);
  color: #fafafa;
}

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

.btn-secondary {
  background: var(--color-canvas);
  color: var(--color-ink);
}

.btn-secondary:hover {
  background: var(--color-hairline);
}

.btn-outline {
  background: transparent;
  color: var(--color-ink);
  border: 1px solid var(--color-hairline);
}

.btn-outline:hover {
  border-color: var(--color-mid-gray);
  background: var(--color-surface-alt);
}

.btn-ghost {
  background: transparent;
  color: var(--color-mid-gray);
  padding: 0 12px;
}

.btn-ghost:hover {
  color: var(--color-ink);
  background: var(--color-surface-alt);
}

.btn-violet {
  background: var(--color-violet);
  color: #ffffff;
}

.btn-violet:hover {
  background: #9333ea;
  transform: translateY(-1px);
}

/* ============================================
   CARDS
   ============================================ */

.card {
  background: var(--color-paper);
  border-radius: var(--radius-cards);
  border: 1px solid var(--color-hairline);
  box-shadow: var(--shadow-card);
  padding: var(--card-padding);
  transition: all 0.3s ease;
}

.card:hover {
  box-shadow: 0 0 0 1px rgba(23,23,23,0.08), 0 4px 12px rgba(0,0,0,0.08), 0 2px 4px -1px rgba(0,0,0,0.08);
  transform: translateY(-2px);
}

.card-header {
  padding: var(--card-padding);
  border-bottom: 1px solid var(--color-hairline);
  margin: calc(-1 * var(--card-padding));
  margin-bottom: var(--card-padding);
  border-radius: var(--radius-cards) var(--radius-cards) 0 0;
}

.card-footer {
  padding: var(--card-padding);
  border-top: 1px solid var(--color-hairline);
  margin: calc(-1 * var(--card-padding));
  margin-top: var(--card-padding);
  border-radius: 0 0 var(--radius-cards) var(--radius-cards);
}

/* ============================================
   BADGES
   ============================================ */

.badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-family: var(--font-primary);
  font-size: 12px;
  font-weight: 500;
  padding: 2px 10px;
  border-radius: var(--radius-badges);
  line-height: 1.5;
}

.badge-solid {
  background: var(--color-ink-soft);
  color: #fafafa;
}

.badge-soft {
  background: var(--color-canvas);
  color: var(--color-ink-soft);
}

.badge-outline {
  background: transparent;
  color: var(--color-ink);
  border: 1px solid var(--color-hairline);
}

.badge-violet {
  background: rgba(175, 80, 255, 0.1);
  color: var(--color-violet);
}

/* ============================================
   INPUTS
   ============================================ */

.input {
  font-family: var(--font-primary);
  font-size: 14px;
  font-weight: 400;
  color: var(--color-ink);
  background: var(--color-canvas);
  border: none;
  border-radius: var(--radius-inputs);
  padding: 10px 14px;
  width: 100%;
  transition: all 0.2s ease;
  outline: none;
}

.input::placeholder {
  color: var(--color-mid-gray);
}

.input:focus {
  background: var(--color-paper);
  box-shadow: 0 0 0 1px var(--color-hairline);
}

/* ============================================
   TYPOGRAPHY
   ============================================ */

.display {
  font-family: var(--font-primary);
  font-size: clamp(36px, 5vw, 48px);
  font-weight: 600;
  line-height: 1.1;
  letter-spacing: -0.05em;
  color: var(--color-ink);
}

.heading-lg {
  font-family: var(--font-primary);
  font-size: clamp(28px, 4vw, 36px);
  font-weight: 600;
  line-height: 1.11;
  letter-spacing: -0.025em;
  color: var(--color-ink);
}

.heading {
  font-family: var(--font-primary);
  font-size: clamp(24px, 3vw, 30px);
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -0.025em;
  color: var(--color-ink);
}

.heading-sm {
  font-family: var(--font-primary);
  font-size: 24px;
  font-weight: 600;
  line-height: 1.33;
  letter-spacing: -0.025em;
  color: var(--color-ink);
}

.subheading {
  font-family: var(--font-primary);
  font-size: 18px;
  font-weight: 500;
  line-height: 1.56;
  color: var(--color-ink);
}

.body-lg {
  font-family: var(--font-primary);
  font-size: 16px;
  font-weight: 400;
  line-height: 1.5;
  color: var(--color-mid-gray);
}

.body {
  font-family: var(--font-primary);
  font-size: 14px;
  font-weight: 400;
  line-height: 1.43;
  color: var(--color-mid-gray);
}

.caption {
  font-family: var(--font-primary);
  font-size: 12px;
  font-weight: 500;
  line-height: 1.33;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--color-mid-gray);
}

/* ============================================
   HERO
   ============================================ */

.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: 64px;
  background: linear-gradient(180deg, var(--color-paper) 0%, var(--color-canvas) 100%);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0; right: 0;
  width: 60%; height: 100%;
  background: radial-gradient(circle at 80% 30%, rgba(175, 80, 255, 0.06) 0%, transparent 60%);
  pointer-events: none;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
  max-width: var(--page-max-width);
  margin: 0 auto;
  padding: 0 24px;
  width: 100%;
}

.hero-left {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-violet);
}

.hero-tag::before {
  content: '';
  width: 24px; height: 2px;
  background: var(--color-violet);
  border-radius: 1px;
}

.hero-body {
  font-size: 18px;
  line-height: 1.56;
  color: var(--color-mid-gray);
  max-width: 480px;
}

.hero-cta {
  display: flex;
  gap: 12px;
  margin-top: 8px;
}

.hero-visual {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}

.hero-card {
  background: var(--color-paper);
  border: 1px solid var(--color-hairline);
  border-radius: var(--radius-cards);
  padding: 32px;
  box-shadow: var(--shadow-card);
  width: 100%;
  max-width: 420px;
}

/* ============================================
   GRIDS
   ============================================ */

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

/* ============================================
   FEATURE CARDS
   ============================================ */

.feature-card {
  background: var(--color-paper);
  border: 1px solid var(--color-hairline);
  border-radius: var(--radius-cards);
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  transition: all 0.3s ease;
  cursor: pointer;
  text-decoration: none;
  color: inherit;
}

.feature-card:hover {
  border-color: rgba(175, 80, 255, 0.3);
  box-shadow: 0 0 0 1px rgba(175, 80, 255, 0.05), 0 4px 12px rgba(0,0,0,0.06);
}

.feature-icon {
  width: 40px; height: 40px;
  border-radius: var(--radius-nested);
  background: var(--color-surface-alt);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-violet);
}

.feature-icon svg {
  width: 20px; height: 20px;
}

.feature-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-ink);
}

.feature-desc {
  font-size: 14px;
  line-height: 1.5;
  color: var(--color-mid-gray);
}

.feature-link {
  font-size: 14px;
  font-weight: 500;
  color: var(--color-violet);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 4px;
  margin-top: auto;
  padding-top: 8px;
}

.feature-link:hover {
  color: #9333ea;
}

/* ============================================
   STAT BLOCKS
   ============================================ */

.stat-block {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.stat-label {
  font-size: 12px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-mid-gray);
}

.stat-value {
  font-size: clamp(28px, 3vw, 36px);
  font-weight: 600;
  line-height: 1.1;
  letter-spacing: -0.025em;
  color: var(--color-ink);
}

.stat-value .accent {
  color: var(--color-violet);
}

/* ============================================
   MODULE CARDS
   ============================================ */

.module-card {
  background: var(--color-paper);
  border: 1px solid var(--color-hairline);
  border-radius: var(--radius-cards);
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.module-number {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  color: var(--color-violet);
  letter-spacing: 0.05em;
}

.module-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--color-ink);
}

.module-desc {
  font-size: 14px;
  line-height: 1.5;
  color: var(--color-mid-gray);
}

.module-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-top: 8px;
}

.module-list li {
  font-size: 13px;
  color: var(--color-mid-gray);
  display: flex;
  align-items: flex-start;
  gap: 8px;
}

.module-list li::before {
  content: '—';
  color: var(--color-violet);
  font-weight: 500;
  flex-shrink: 0;
}

/* ============================================
   PROCESS STEPS
   ============================================ */

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

.process-grid::before {
  content: '';
  position: absolute;
  top: 28px;
  left: 16.66%;
  right: 16.66%;
  height: 2px;
  background: linear-gradient(90deg, var(--color-violet), var(--color-violet-soft), var(--color-violet));
  opacity: 0.2;
}

.process-item {
  display: flex;
  flex-direction: column;
  gap: 16px;
  position: relative;
  z-index: 1;
}

.process-step {
  width: 56px; height: 56px;
  border-radius: 50%;
  background: var(--color-paper);
  border: 2px solid var(--color-violet);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 18px;
  font-weight: 600;
  color: var(--color-violet);
}

.process-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--color-ink);
}

.process-desc {
  font-size: 14px;
  line-height: 1.5;
  color: var(--color-mid-gray);
}

/* ============================================
   ARCHITECTURE DIAGRAM
   ============================================ */

.arch-layer {
  background: var(--color-paper);
  border: 1px solid var(--color-hairline);
  border-radius: var(--radius-nested);
  padding: 16px 20px;
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 12px;
  transition: all 0.2s ease;
}

.arch-layer:hover {
  border-color: rgba(175, 80, 255, 0.3);
  background: var(--color-surface-alt);
}

.arch-layer:last-child { margin-bottom: 0; }

.arch-icon {
  width: 36px; height: 36px;
  border-radius: var(--radius-small);
  background: var(--color-surface-alt);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-violet);
  flex-shrink: 0;
}

.arch-content {
  flex: 1;
}

.arch-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-ink);
}

.arch-desc {
  font-size: 13px;
  color: var(--color-mid-gray);
}

.arch-arrow {
  text-align: center;
  padding: 4px 0;
  color: var(--color-mid-gray);
  font-size: 12px;
}

/* ============================================
   SECURITY SECTION
   ============================================ */

.security-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.security-item {
  background: var(--color-paper);
  border: 1px solid var(--color-hairline);
  border-radius: var(--radius-nested);
  padding: 20px;
  display: flex;
  gap: 16px;
  align-items: flex-start;
}

.security-icon {
  width: 40px; height: 40px;
  border-radius: var(--radius-small);
  background: var(--color-surface-alt);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-violet);
  flex-shrink: 0;
}

.security-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-ink);
  margin-bottom: 4px;
}

.security-desc {
  font-size: 13px;
  line-height: 1.5;
  color: var(--color-mid-gray);
}

/* ============================================
   SEO / SEMANTIC CORE
   ============================================ */

.seo-table {
  width: 100%;
  border-collapse: collapse;
}

.seo-table th,
.seo-table td {
  text-align: left;
  padding: 12px 16px;
  font-size: 14px;
  border-bottom: 1px solid var(--color-hairline);
}

.seo-table th {
  font-weight: 600;
  color: var(--color-ink);
  background: var(--color-surface-alt);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.seo-table td {
  color: var(--color-mid-gray);
}

.seo-table tr:hover td {
  background: var(--color-surface-alt);
}

/* ============================================
   FOOTER
   ============================================ */

.footer {
  padding: 48px 0;
  border-top: 1px solid var(--color-hairline);
  background: var(--color-paper);
}

.footer-inner {
  max-width: var(--page-max-width);
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.footer-left {
  display: flex;
  align-items: center;
  gap: 16px;
}

.footer-text {
  font-size: 14px;
  color: var(--color-mid-gray);
}

.footer-right {
  display: flex;
  align-items: center;
  gap: 16px;
}

.footer-coords {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--color-mid-gray);
  letter-spacing: 0.02em;
}

/* ============================================
   ANIMATIONS
   ============================================ */

@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

.animate {
  opacity: 0;
}

.animate.visible {
  animation: fadeInUp 0.6s ease forwards;
}

.animate-delay-1 { animation-delay: 0.1s; }
.animate-delay-2 { animation-delay: 0.2s; }
.animate-delay-3 { animation-delay: 0.3s; }
.animate-delay-4 { animation-delay: 0.4s; }
.animate-delay-5 { animation-delay: 0.5s; }

/* ============================================
   RESPONSIVE
   ============================================ */

@media (max-width: 1024px) {
  .hero-grid { grid-template-columns: 1fr; gap: 48px; }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .process-grid { grid-template-columns: 1fr; gap: 40px; }
  .process-grid::before { display: none; }
  .security-grid { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
  .nav-links { display: none; }
  .grid-3 { grid-template-columns: 1fr; }
  .grid-4 { grid-template-columns: 1fr; }
  .grid-2 { grid-template-columns: 1fr; }
  .hero-cta { flex-direction: column; }
  .footer-inner { flex-direction: column; gap: 24px; text-align: center; }
  .section { padding: 40px 0; }
}

/* Mobile menu button */
.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  color: var(--color-ink);
  cursor: pointer;
  padding: 8px;
}

@media (max-width: 768px) {
  .mobile-menu-btn { display: block; }
}

/* ============================================
   UTILITIES
   ============================================ */

.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.mb-4 { margin-bottom: 4px; }
.mb-8 { margin-bottom: 8px; }
.mb-12 { margin-bottom: 12px; }
.mb-16 { margin-bottom: 16px; }
.mb-24 { margin-bottom: 24px; }
.mb-32 { margin-bottom: 32px; }
.mb-48 { margin-bottom: 48px; }

.mt-4 { margin-top: 4px; }
.mt-8 { margin-top: 8px; }
.mt-16 { margin-top: 16px; }
.mt-24 { margin-top: 24px; }
.mt-32 { margin-top: 32px; }

.gap-8 { gap: 8px; }
.gap-12 { gap: 12px; }
.gap-16 { gap: 16px; }
.gap-24 { gap: 24px; }

.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.justify-center { justify-content: center; }

.w-full { width: 100%; }
.max-w-2xl { max-width: 640px; }
.max-w-3xl { max-width: 768px; }
.mx-auto { margin-left: auto; margin-right: auto; }

/* Hairline divider */
.divider {
  height: 1px;
  background: var(--color-hairline);
  width: 100%;
}

/* Section header */
.section-header {
  margin-bottom: 48px;
}

.section-header .caption {
  margin-bottom: 12px;
}

.section-header .heading {
  margin-bottom: 16px;
}

.section-header .body-lg {
  max-width: 640px;
}