/* === Rafif Shafwan — Personal Website ===
   Aesthetic: Editorial · Papery · Professional · Light mode
   ============================================================ */

/* ============================================================
   DESIGN TOKENS
   ============================================================ */
:root {
  /* Surface */
  --bg-primary:   #f7f6f2;
  --bg-secondary: #f0eeea;
  --bg-card:      #ffffff;
  --bg-card-alt:  #faf9f6;

  /* Text */
  --text-primary:   #1c1c28;
  --text-secondary: #52525e;
  --text-muted:     #9898a6;

  /* Accent */
  --accent:       #4f46a8;
  --accent-light: #6b61cc;
  --accent-glow:  rgba(79, 70, 168, 0.12);
  --accent-teal:  #0891a8;

  /* Semantic */
  --success: #1a8f6b;
  --warning: #a06c1a;

  /* Borders */
  --border:        #e4e2dc;
  --border-strong: #cccac3;
  --border-accent: rgba(79,70,168,0.25);

  /* Radius */
  --radius:    8px;
  --radius-lg: 14px;
  --radius-xl: 22px;

  /* Fonts */
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

  /* Transitions */
  --t-fast: 0.15s ease;
  --t-med:  0.28s ease;
  --t-slow: 0.5s cubic-bezier(0.16,1,0.3,1);
}

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

html {
  scroll-behavior: smooth;
  scrollbar-width: thin;
  scrollbar-color: var(--border-strong) var(--bg-secondary);
}

::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg-secondary); }
::-webkit-scrollbar-thumb { background: var(--border-strong); border-radius: 99px; }

body {
  background: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-sans);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  transition: opacity 0.18s ease;
}

body.lang-fading {
  opacity: 0;
}

/* ============================================================
   TYPOGRAPHY
   ============================================================ */
h1,h2,h3,h4,h5,h6 {
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.025em;
  color: var(--text-primary);
}

h1 { font-size: clamp(2.2rem, 5vw, 3.6rem); }
h2 { font-size: clamp(1.6rem, 3vw, 2.2rem); }
h3 { font-size: clamp(1.05rem, 1.8vw, 1.25rem); }

p { color: var(--text-secondary); line-height: 1.75; }

a {
  color: var(--accent);
  text-decoration: none;
  transition: color var(--t-fast);
}
a:hover { color: var(--accent-light); }

strong { color: var(--text-primary); font-weight: 600; }

code, pre { font-family: var(--font-mono); }

pre {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.1rem 1.4rem;
  overflow-x: auto;
  line-height: 1.65;
  font-size: 0.88rem;
}

code {
  background: rgba(79,70,168,0.07);
  padding: 0.12em 0.45em;
  border-radius: 4px;
  font-size: 0.86em;
  color: var(--accent);
}
pre code { background: none; padding: 0; color: inherit; }

blockquote {
  border-left: 3px solid var(--border-strong);
  padding-left: 1.25rem;
  margin: 1.5rem 0;
  color: var(--text-secondary);
  font-style: italic;
}

hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 2.5rem 0;
}

/* ============================================================
   LAYOUT
   ============================================================ */
.container {
  max-width: 1060px;
  margin: 0 auto;
  padding: 0 2rem;
}

.section { padding: 5rem 0; }

.section-alt {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

/* ============================================================
   NAVBAR
   ============================================================ */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  background: rgba(247, 246, 242, 0.88);
  backdrop-filter: blur(16px) saturate(1.6);
  -webkit-backdrop-filter: blur(16px) saturate(1.6);
  border-bottom: 1px solid var(--border);
  transition: background var(--t-med), box-shadow var(--t-med);
}
.navbar.scrolled {
  background: rgba(247, 246, 242, 0.97);
  box-shadow: 0 1px 24px rgba(0,0,0,0.06);
}

.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 0.85rem;
  padding-bottom: 0.85rem;
}

.nav-logo {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--text-primary);
  letter-spacing: -0.01em;
  transition: opacity var(--t-fast);
  display: flex;
  align-items: center;
}
.nav-logo-img {
  height: 24px;
  width: auto;
  display: block;
  margin-right: 0.5rem;
}
.nav-logo:hover { opacity: 0.7; color: var(--text-primary); }
.nav-logo span { color: var(--accent); }

.nav-links {
  display: flex;
  gap: 2.25rem;
  list-style: none;
  align-items: center;
}

.nav-links a {
  color: var(--text-muted);
  font-size: 0.87rem;
  font-weight: 500;
  letter-spacing: 0.005em;
  transition: color var(--t-fast);
  position: relative;
}
.nav-links a:hover,
.nav-links a.active { color: var(--text-primary); }
.nav-links a.active::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0; right: 0;
  height: 1.5px;
  background: var(--text-primary);
  border-radius: 2px;
}

.nav-cta {
  background: var(--text-primary) !important;
  color: var(--bg-primary) !important;
  padding: 0.42rem 1rem !important;
  border-radius: var(--radius) !important;
  font-weight: 600 !important;
  font-size: 0.85rem !important;
  letter-spacing: 0.01em !important;
  transition: opacity var(--t-fast) !important;
}
.nav-cta:hover { opacity: 0.82 !important; color: var(--bg-primary) !important; }
.nav-cta.active::after { display: none !important; }

/* Language toggle */
.lang-toggle {
  background: none;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-muted);
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 600;
  padding: 0.25rem 0.55rem;
  transition: all var(--t-fast);
  line-height: 1.4;
}
.lang-toggle:hover {
  border-color: var(--text-primary);
  color: var(--text-primary);
}

/* Mobile nav */
.mobile-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.4rem;
  flex-direction: column;
  gap: 5px;
}
.mobile-toggle span {
  display: block;
  width: 20px;
  height: 1.5px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: all var(--t-med);
  transform-origin: center;
}
.mobile-toggle.open span:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
.mobile-toggle.open span:nth-child(2) { opacity: 0; }
.mobile-toggle.open span:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }

@media (max-width: 768px) {
  /* backdrop-filter creates a containing block that traps fixed children
     inside the navbar height — disable it so the mobile menu can cover the viewport */
  .navbar {
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
    background: var(--bg-primary);
  }

  .mobile-toggle { display: flex; }
  .nav-links {
    position: fixed;
    top: 56px;
    right: 0;
    bottom: 0;
    left: 0;
    background: var(--bg-primary);
    flex-direction: column;
    justify-content: flex-start;
    padding: 3rem 2rem;
    gap: 2rem;
    transform: translateX(100%);
    transition: transform var(--t-slow);
    z-index: 999;
    overflow-y: auto;
    border-top: 1px solid var(--border);
  }
  .nav-links.open { transform: translateX(0); }
  .nav-links a { font-size: 1.15rem; }
}

/* ============================================================
   HERO
   ============================================================ */
.hero {
  min-height: 92vh;
  display: flex;
  align-items: center;
  padding-top: 5rem;
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--border);
}

/* Subtle noise texture overlay */
.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='300' height='300'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.75' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='300' height='300' filter='url(%23n)' opacity='0.025'/%3E%3C/svg%3E");
  pointer-events: none;
  opacity: 0.6;
}

/* Faint dot grid */
.hero::after {
  content: '';
  position: absolute;
  inset: 0;
  background-image: radial-gradient(circle, rgba(0,0,0,0.07) 1px, transparent 1px);
  background-size: 28px 28px;
  pointer-events: none;
  mask-image: radial-gradient(ellipse 70% 70% at 50% 50%, black 40%, transparent 100%);
  -webkit-mask-image: radial-gradient(ellipse 70% 70% at 50% 50%, black 40%, transparent 100%);
}

/* Canvas hidden in papery mode */
.hero-canvas { display: none; }

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 760px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  background: transparent;
  border: 1px solid var(--border-strong);
  border-radius: 50px;
  padding: 0.35rem 0.9rem;
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-bottom: 2.25rem;
  letter-spacing: 0.01em;
}
.hero-badge .dot {
  width: 6px;
  height: 6px;
  background: var(--success);
  border-radius: 50%;
  flex-shrink: 0;
  animation: pulse-dot 2.4s ease-in-out infinite;
}
@keyframes pulse-dot {
  0%,100% { opacity: 1; transform: scale(1); }
  50%      { opacity: 0.4; transform: scale(0.75); }
}

.hero h1 { margin-bottom: 1.5rem; font-weight: 800; }
.hero h1 .highlight {
  color: var(--accent);
  -webkit-text-fill-color: var(--accent);
  background: none;
}

/* Typed text sits inline */
#typedText { color: var(--accent); }

.cursor-blink {
  display: inline;
  color: var(--accent);
  animation: blink 1.1s step-end infinite;
  margin-left: 1px;
  font-weight: 300;
}
@keyframes blink { 0%,100% { opacity: 1; } 50% { opacity: 0; } }

.hero p {
  font-size: 1.08rem;
  max-width: 540px;
  margin-bottom: 2.5rem;
  color: var(--text-secondary);
}

.hero-cta {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  align-items: center;
}

/* Scroll hint */
.hero-scroll-hint {
  position: absolute;
  bottom: 2.5rem;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.45rem;
  z-index: 2;
  animation: bounce-hint 2.2s ease-in-out infinite;
}
.hero-scroll-hint span {
  font-size: 0.65rem;
  color: var(--text-muted);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  font-family: var(--font-mono);
}
.scroll-line {
  width: 1px;
  height: 36px;
  background: linear-gradient(to bottom, var(--border-strong), transparent);
}
@keyframes bounce-hint {
  0%,100% { transform: translateX(-50%) translateY(0); }
  55%     { transform: translateX(-50%) translateY(7px); }
}

/* ============================================================
   BUTTONS
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.65rem 1.4rem;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 0.88rem;
  cursor: pointer;
  transition: all var(--t-fast);
  border: none;
  font-family: var(--font-sans);
  text-decoration: none;
  letter-spacing: 0.01em;
}

.btn-primary {
  background: var(--text-primary);
  color: var(--bg-primary);
}
.btn-primary:hover {
  background: #2d2d3a;
  color: var(--bg-primary);
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(0,0,0,0.14);
}

.btn-secondary {
  background: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border-strong);
}
.btn-secondary:hover {
  border-color: var(--text-primary);
  background: rgba(0,0,0,0.03);
  color: var(--text-primary);
}

.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
  padding: 0.55rem 0.9rem;
}
.btn-ghost:hover {
  color: var(--text-primary);
  background: rgba(0,0,0,0.04);
}

/* ============================================================
   STATS BAR
   ============================================================ */
.stats-bar {
  background: var(--bg-card);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  padding: 2rem 0;
}

.stats-grid {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
}

.stat-item {
  flex: 1;
  min-width: 120px;
  text-align: center;
  padding: 0.5rem 2rem;
}

.stat-number {
  font-family: var(--font-mono);
  font-size: 2rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.1;
  letter-spacing: -0.03em;
}

.stat-label {
  font-size: 0.72rem;
  color: var(--text-muted);
  margin-top: 0.3rem;
  text-transform: uppercase;
  letter-spacing: 0.09em;
}

.stat-divider {
  width: 1px;
  height: 36px;
  background: var(--border);
  flex-shrink: 0;
}

@media (max-width: 580px) {
  .stat-divider { display: none; }
  .stats-grid   { gap: 0.5rem; }
  .stat-item    { min-width: 110px; padding: 0.5rem 1rem; }
}

/* ============================================================
   STACK SECTION
   ============================================================ */
.stack-grid {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.stack-group {
  display: flex;
  align-items: flex-start;
  gap: 1.5rem;
  flex-wrap: wrap;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--border);
}
.stack-group:last-child { border-bottom: none; padding-bottom: 0; }

.stack-group-label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  min-width: 80px;
  padding-top: 0.3rem;
  flex-shrink: 0;
}

.stack-pills { display: flex; flex-wrap: wrap; gap: 0.4rem; }

.pill {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  border-radius: 4px;
  font-size: 0.78rem;
  font-weight: 500;
  font-family: var(--font-mono);
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  transition: all var(--t-fast);
  cursor: default;
}
.pill:hover {
  background: var(--bg-card);
  border-color: var(--border-strong);
  color: var(--text-primary);
}

/* ============================================================
   SECTION HEADER
   ============================================================ */
.section-header { margin-bottom: 3rem; }
.section-header h2 { margin-bottom: 0.6rem; }
.section-header p  { max-width: 520px; font-size: 1rem; }

.section-label {
  display: inline-block;
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  margin-bottom: 0.65rem;
}

/* ============================================================
   TAGS / BADGES
   ============================================================ */
.tag {
  display: inline-block;
  padding: 0.18rem 0.6rem;
  border-radius: 4px;
  font-size: 0.73rem;
  font-weight: 500;
  font-family: var(--font-mono);
  background: var(--bg-secondary);
  color: var(--text-secondary);
  border: 1px solid var(--border);
}

.tag-row { display: flex; flex-wrap: wrap; gap: 0.35rem; margin-top: 0.9rem; }

.nda-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  background: rgba(160, 108, 26, 0.07);
  border: 1px solid rgba(160,108,26,0.2);
  color: var(--warning);
  padding: 0.18rem 0.6rem;
  border-radius: 4px;
  font-size: 0.7rem;
  font-weight: 600;
  font-family: var(--font-mono);
}

/* ============================================================
   CARD GRID
   ============================================================ */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.25rem;
}

/* ============================================================
   CASE STUDY CARDS
   ============================================================ */
.case-study {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: border-color var(--t-med), box-shadow var(--t-med), transform var(--t-med);
}
.case-study:hover {
  border-color: var(--border-strong);
  box-shadow: 0 8px 32px rgba(0,0,0,0.07);
  transform: translateY(-2px);
}

.case-study-body { padding: 1.6rem; }

.case-study-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 0.75rem;
  margin-bottom: 0.4rem;
  flex-wrap: wrap;
}

.case-study h3 { font-size: 1.08rem; }
.case-study h3 a {
  color: var(--text-primary);
  transition: color var(--t-fast);
}
.case-study h3 a:hover { color: var(--accent); }

.case-study .meta {
  color: var(--text-muted);
  font-size: 0.75rem;
  font-family: var(--font-mono);
  margin-bottom: 0.75rem;
  letter-spacing: 0.02em;
}

.case-study p {
  font-size: 0.88rem;
  line-height: 1.7;
  color: var(--text-secondary);
}

.case-study-link {
  display: inline-block;
  margin-top: 1.1rem;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
  transition: color var(--t-fast);
  letter-spacing: 0.01em;
}
.case-study-link:hover { color: var(--accent); }

/* ============================================================
   BLOG CARDS
   ============================================================ */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.6rem;
  transition: border-color var(--t-med), transform var(--t-med), box-shadow var(--t-med);
}
.card:hover {
  border-color: var(--border-strong);
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(0,0,0,0.06);
}

.blog-meta-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.75rem;
}

.blog-tag {
  font-size: 0.7rem;
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.blog-read-time {
  font-size: 0.7rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

.card h3 { margin-bottom: 0.55rem; font-size: 1rem; }
.card h3 a { color: var(--text-primary); }
.card h3 a:hover { color: var(--accent); }
.card p { font-size: 0.86rem; line-height: 1.7; margin-bottom: 0.9rem; }

.blog-date { font-size: 0.72rem; color: var(--text-muted); font-family: var(--font-mono); }

/* ============================================================
   PHILOSOPHY SECTION
   ============================================================ */
.philosophy-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 5rem;
  align-items: start;
}

.philosophy-text h2    { margin-bottom: 1rem; }
.philosophy-text p     { margin-bottom: 0.9rem; }
.philosophy-text .btn  { margin-top: 1.25rem; }

.philosophy-principles { display: flex; flex-direction: column; gap: 0; }

.principle-card {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  padding: 1.1rem 0;
  border-bottom: 1px solid var(--border);
  transition: background var(--t-fast);
}
.principle-card:first-child { border-top: 1px solid var(--border); }

.principle-icon {
  font-size: 1.1rem;
  flex-shrink: 0;
  margin-top: 2px;
  width: 24px;
  text-align: center;
}

.principle-card strong { display: block; font-size: 0.88rem; margin-bottom: 0.15rem; }
.principle-card span   { font-size: 0.8rem; color: var(--text-muted); }

@media (max-width: 880px) {
  .philosophy-layout { grid-template-columns: 1fr; gap: 2.5rem; }
}

/* ============================================================
   DEMO CARD
   ============================================================ */
.demo-card {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: 2.75rem;
}

.demo-card-content h2    { margin: 0.5rem 0 0.9rem; }
.demo-card-content p     { margin-bottom: 1.5rem; font-size: 0.93rem; }
.demo-actions { display: flex; gap: 0.75rem; flex-wrap: wrap; align-items: center; }

/* Chat preview */
.chat-preview {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

.chat-msg {
  max-width: 85%;
  padding: 0.55rem 0.9rem;
  border-radius: 10px;
  font-size: 0.8rem;
  line-height: 1.55;
}

.chat-msg.user {
  background: var(--text-primary);
  color: var(--bg-primary);
  align-self: flex-end;
  border-bottom-right-radius: 3px;
}

.chat-msg.bot {
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  align-self: flex-start;
  border-bottom-left-radius: 3px;
}

.chat-msg.typing {
  display: flex;
  gap: 4px;
  align-items: center;
  padding: 0.75rem 0.9rem;
}
.chat-msg.typing span {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--text-muted);
  animation: typing-bounce 1.4s infinite ease-in-out;
}
.chat-msg.typing span:nth-child(2) { animation-delay: 0.18s; }
.chat-msg.typing span:nth-child(3) { animation-delay: 0.36s; }
@keyframes typing-bounce {
  0%,80%,100% { transform: translateY(0); opacity: 0.4; }
  40%         { transform: translateY(-5px); opacity: 1; }
}

@media (max-width: 780px) {
  .demo-card { grid-template-columns: 1fr; padding: 2rem; gap: 1.5rem; }
  .demo-card-visual { display: none; }
}

/* ============================================================
   FOOTER
   ============================================================ */
.footer {
  border-top: 1px solid var(--border);
  padding: 3rem 0;
  background: var(--bg-card);
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1.25rem;
}

.footer-logo { font-size: 0.95rem; }

.footer-links { display: flex; gap: 1.75rem; }
.footer-links a {
  color: var(--text-muted);
  font-size: 0.85rem;
  transition: color var(--t-fast);
}
.footer-links a:hover { color: var(--text-primary); }

.footer-copy { font-size: 0.78rem; color: var(--text-muted); }

@media (max-width: 600px) { .footer-inner { flex-direction: column; } }

/* ============================================================
   PAGE TITLE (inner pages)
   ============================================================ */
.page-title {
  padding: 8rem 0 3.5rem;
  border-bottom: 1px solid var(--border);
}
.page-title span  { display: block; margin-bottom: 0.65rem; }
.page-title h1    { margin-bottom: 0.9rem; }
.page-title p {
  font-size: 1.05rem;
  max-width: 560px;
}

/* ============================================================
   BLOG POST
   ============================================================ */
.blog-post {
  max-width: 700px;
  margin: 0 auto;
  padding: 2rem 0 5rem;
}
.blog-post h2         { margin: 2.5rem 0 1rem; }
.blog-post h3         { margin: 2rem 0 0.75rem; }
.blog-post p          { margin-bottom: 1.25rem; line-height: 1.8; }
.blog-post ul,
.blog-post ol         { margin: 1rem 0 1.5rem 1.5rem; }
.blog-post li         { margin-bottom: 0.4rem; color: var(--text-secondary); }
.blog-post .post-meta {
  color: var(--text-muted);
  font-size: 0.85rem;
  margin-bottom: 2.5rem;
  display: flex;
  gap: 1.5rem;
  flex-wrap: wrap;
}

/* ============================================================
   CONTACT FORM
   ============================================================ */
.form-group { margin-bottom: 1.25rem; }
.form-group label {
  display: block;
  margin-bottom: 0.4rem;
  font-weight: 500;
  font-size: 0.86rem;
  color: var(--text-secondary);
}
.form-group input,
.form-group textarea {
  width: 100%;
  padding: 0.7rem 1rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 0.92rem;
  transition: border-color var(--t-fast), box-shadow var(--t-fast);
}
.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--border-strong);
  box-shadow: 0 0 0 3px rgba(0,0,0,0.05);
}
.form-group textarea { min-height: 140px; resize: vertical; }

/* ============================================================
   USES PAGE
   ============================================================ */
.uses-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(270px, 1fr));
  gap: 1.25rem;
}
.uses-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
}
.uses-card h3 { display: flex; align-items: center; gap: 0.5rem; margin-bottom: 0.9rem; font-size: 1rem; }
.uses-card ul { list-style: none; padding: 0; }
.uses-card li {
  padding: 0.4rem 0;
  color: var(--text-secondary);
  font-size: 0.88rem;
  border-bottom: 1px solid var(--border);
}
.uses-card li:last-child { border-bottom: none; }

/* ============================================================
   MERMAID DIAGRAMS
   ============================================================ */
.mermaid {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  margin: 2rem 0;
  display: flex;
  justify-content: center;
  overflow-x: auto;
}

/* ============================================================
   CHATBOT EMBED
   ============================================================ */
.chatbot-frame {
  width: 100%;
  height: 600px;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: var(--bg-secondary);
}

/* ============================================================
   SCROLL ANIMATIONS
   ============================================================ */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.55s cubic-bezier(0.16,1,0.3,1),
              transform 0.55s cubic-bezier(0.16,1,0.3,1);
}
.fade-in.visible { opacity: 1; transform: translateY(0); }

.stagger-child {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.45s ease, transform 0.45s ease;
}
.stagger-child.visible { opacity: 1; transform: translateY(0); }

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 600px) {
  .section     { padding: 3.5rem 0; }
  .hero        { min-height: auto; padding: 8rem 0 4rem; }
  .hero-cta    { flex-direction: column; align-items: flex-start; }
  .card-grid   { grid-template-columns: 1fr; }
  .page-title  { padding: 6.5rem 0 2.5rem; }
  .stack-group { flex-direction: column; gap: 0.75rem; }
  .stack-group-label { min-width: auto; }
}