*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --orange: #F47920;
  --orange-soft: rgba(244,121,32,0.14);
  --bg: #0A0A0B;
  --bg-elev: #121214;
  --bg-card: #161618;
  --border: rgba(255,255,255,0.08);
  --border-strong: rgba(255,255,255,0.14);
  --text: #EDEDED;
  --text-soft: rgba(237,237,237,0.72);
  --muted: rgba(237,237,237,0.5);
  --dim: rgba(237,237,237,0.32);
}

html { scroll-behavior: smooth; }

body {
  font-family: 'DM Sans', sans-serif;
  background: var(--bg);
  color: var(--text);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  background-image:
    radial-gradient(circle at 12% -10%, rgba(244,121,32,0.08), transparent 40%),
    linear-gradient(rgba(255,255,255,0.018) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.018) 1px, transparent 1px);
  background-size: auto, 64px 64px, 64px 64px;
}

h1, h2, h3, h4, .nav-cta { font-family: 'Outfit', sans-serif; }
.mono, .eyebrow, .label, .tag, .theory-badge, .model-num, .tl-period, .tcard-year, .lang-btn, .pv-badge {
  font-family: 'JetBrains Mono', monospace;
}

.container { max-width: 1080px; margin: 0 auto; padding: 0 2rem; }

/* ─── NAV ─── */
nav {
  position: sticky; top: 0; z-index: 100;
  background: rgba(10,10,11,0.78);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  display: flex; align-items: center; justify-content: space-between;
  padding: 1.1rem 2rem; max-width: 1080px; margin: 0 auto;
}
.nav-logo img { height: 28px; width: auto; display: block; }
.nav-right { display: flex; align-items: center; gap: 1.5rem; }
.lang-toggle { display: flex; align-items: center; gap: 0.2rem; }
.lang-btn {
  background: none; border: none; cursor: pointer;
  padding: 0.3rem 0.55rem; color: var(--muted);
  font-size: 11px; font-weight: 500; letter-spacing: 0.06em;
  border-radius: 3px; transition: color 0.18s, background 0.18s;
}
.lang-btn:hover { color: var(--text); }
.lang-btn.active { color: var(--text); background: rgba(255,255,255,0.06); }
.lang-sep { font-size: 11px; color: var(--dim); }
.nav-cta {
  display: inline-flex; align-items: center; gap: 0.45rem;
  background: var(--orange); color: #0A0A0B; text-decoration: none;
  padding: 0.55rem 1.1rem; border-radius: 4px;
  font-size: 13px; font-weight: 500; letter-spacing: 0.01em;
  transition: filter 0.18s, transform 0.18s;
}
.nav-cta:hover { filter: brightness(1.08); }

/* nav menu */
.nav-menu {
  display: flex; align-items: center; gap: 0.25rem;
  list-style: none; margin: 0; padding: 0;
}
.nav-menu a {
  display: inline-flex; align-items: center;
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px; font-weight: 400; letter-spacing: 0.04em;
  color: var(--muted); text-decoration: none;
  padding: 0.5rem 0.85rem; border-radius: 3px;
  position: relative;
  transition: color 0.18s, background 0.18s;
}
.nav-menu a:hover { color: var(--text); }
.nav-menu a.is-active {
  color: var(--text);
  background: rgba(244,121,32,0.08);
}
.nav-menu a.is-active::before {
  content: ''; position: absolute; left: 0.85rem; right: 0.85rem; bottom: 4px;
  height: 1px; background: var(--orange);
}
@media (max-width: 820px) {
  .nav-menu { display: none; }
}
section[id] { scroll-margin-top: 72px; }

/* ─── HERO ─── */
.hero {
  padding: 7rem 2rem 6rem; max-width: 1080px; margin: 0 auto;
  border-bottom: 1px solid var(--border);
  position: relative;
}
.hero::before {
  content: ''; position: absolute; top: 0; left: 2rem; right: 2rem;
  height: 1px; background: linear-gradient(90deg, transparent, var(--orange), transparent);
  opacity: 0.4;
}
.eyebrow {
  display: inline-flex; align-items: center; gap: 0.55rem;
  font-size: 11px; font-weight: 500; letter-spacing: 0.1em;
  color: var(--orange); margin-bottom: 2rem;
  text-transform: uppercase;
}
.eyebrow::before {
  content: ''; width: 6px; height: 6px; background: var(--orange);
  border-radius: 50%;
  box-shadow: 0 0 10px rgba(244,121,32,0.6);
  animation: pulse 2.4s ease-in-out infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.35; }
}

.hero h1 {
  font-size: clamp(2.4rem, 5vw, 4rem); font-weight: 300;
  line-height: 1.15; color: var(--text); margin-bottom: 1.75rem;
  max-width: 880px; letter-spacing: -0.015em;
}
.hero h1 strong { font-weight: 500; color: var(--orange); }

/* word rotator */
.rotator {
  display: inline-flex; align-items: baseline;
  position: relative;
}
.rotator-track {
  display: inline-block;
  position: relative;
  min-width: 1ch;
}
.rot-word {
  display: inline-block;
  color: var(--orange);
  font-weight: 500;
  position: relative;
  white-space: nowrap;
}
.rot-word.is-out {
  animation: rotOut 0.45s cubic-bezier(.65,.05,.36,1) forwards;
}
.rot-word.is-in {
  animation: rotIn 0.55s cubic-bezier(.2,.7,.25,1) forwards;
}
@keyframes rotOut {
  0% { opacity: 1; transform: translateY(0); }
  100% { opacity: 0; transform: translateY(-0.4em); filter: blur(4px); }
}
@keyframes rotIn {
  0% { opacity: 0; transform: translateY(0.5em); filter: blur(4px); }
  100% { opacity: 1; transform: translateY(0); filter: blur(0); }
}
.rot-cursor {
  display: inline-block; width: 2px; height: 0.85em;
  background: var(--orange); margin-left: 4px;
  vertical-align: -0.05em;
  animation: blink 1.05s steps(2) infinite;
}
@keyframes blink { 50% { opacity: 0; } }

.hero-sub {
  font-size: 1.05rem; color: var(--text-soft); max-width: 560px;
  margin-bottom: 3rem; line-height: 1.85; font-weight: 300;
}
.hero-cta {
  display: inline-flex; align-items: center; gap: 0.85rem;
  background: var(--orange); color: #0A0A0B; text-decoration: none;
  padding: 1rem 2rem; border-radius: 4px;
  font-family: 'Outfit', sans-serif; font-weight: 500; font-size: 15px;
  transition: filter 0.2s; letter-spacing: 0.01em;
  box-shadow: 0 0 0 1px rgba(244,121,32,0.4), 0 8px 32px -8px rgba(244,121,32,0.5);
}
.hero-cta:hover { filter: brightness(1.08); }
.hero-cta:hover .arrow { transform: translateX(5px); }
.arrow { display: inline-block; transition: transform 0.2s; }

.hero-meta {
  display: flex; gap: 2.5rem; margin-top: 3.5rem;
  padding-top: 2rem; border-top: 1px dashed var(--border);
  flex-wrap: wrap;
}
.hero-meta-item {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px; color: var(--muted); letter-spacing: 0.04em;
  display: flex; align-items: center; gap: 0.5rem;
}
.hero-meta-item span { color: var(--orange); }

/* ─── SECTION COMMON ─── */
.section { padding: 6rem 0; border-bottom: 1px solid var(--border); }
.label {
  font-size: 11px; font-weight: 500; letter-spacing: 0.12em;
  text-transform: uppercase; color: var(--muted);
  margin-bottom: 1rem; display: inline-flex; align-items: center; gap: 0.5rem;
}
.label::before {
  content: '//'; color: var(--orange); font-weight: 500;
}
.section-title {
  font-size: clamp(1.7rem, 3vw, 2.5rem); font-weight: 400;
  line-height: 1.22; color: var(--text); margin-bottom: 3.5rem;
  letter-spacing: -0.01em; max-width: 780px;
}

/* ─── PROBLEM ─── */
.problem-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; margin-bottom: 1.75rem; }
.pcard {
  background: var(--bg-card); border: 1px solid var(--border); border-radius: 6px;
  padding: 1.85rem 1.75rem; position: relative; overflow: hidden;
  transition: border-color 0.2s, transform 0.2s;
}
.pcard:hover { border-color: var(--border-strong); }
.pcard.accent {
  background: linear-gradient(135deg, rgba(244,121,32,0.12), rgba(244,121,32,0.04));
  border-color: rgba(244,121,32,0.32);
}
.pcard.accent::before {
  content: ''; position: absolute; top: 0; right: 0; width: 80px; height: 80px;
  background: radial-gradient(circle at top right, rgba(244,121,32,0.25), transparent 70%);
  pointer-events: none;
}
.tag {
  font-size: 10px; font-weight: 500; letter-spacing: 0.12em;
  text-transform: uppercase; color: var(--muted); margin-bottom: 0.85rem; display: block;
}
.pcard.accent .tag { color: var(--orange); }
.pcard h3 { font-size: 1.1rem; font-weight: 500; color: var(--text); margin-bottom: 0.85rem; letter-spacing: -0.005em; }
.pcard p { font-size: 14px; color: var(--text-soft); line-height: 1.75; }
.problem-note {
  padding: 1.1rem 1.5rem; background: var(--bg-elev);
  border: 1px solid var(--border); border-left: 2px solid var(--orange);
  border-radius: 0 4px 4px 0; font-size: 14px; color: var(--text-soft);
  font-family: 'JetBrains Mono', monospace; line-height: 1.75; letter-spacing: -0.005em;
}

/* ─── MODEL ─── */
.model-list { display: flex; flex-direction: column; }
.model-item {
  display: grid; grid-template-columns: 88px 1fr; gap: 2.5rem;
  padding: 2.85rem 0; border-bottom: 1px solid var(--border); align-items: start;
  position: relative;
}
.model-item:first-child { border-top: 1px solid var(--border); }
.model-item:hover .model-num { color: var(--orange); }
.model-num {
  font-size: 1.05rem; font-weight: 500; color: var(--dim);
  line-height: 1; padding-top: 0.55rem; letter-spacing: 0.04em;
  transition: color 0.25s;
}
.theory-badge {
  display: inline-flex; align-items: center; gap: 0.4rem;
  background: var(--orange-soft); color: var(--orange);
  font-size: 10px; font-weight: 500;
  letter-spacing: 0.08em; text-transform: uppercase;
  padding: 0.32rem 0.65rem; border-radius: 3px; margin-bottom: 0.85rem;
  border: 1px solid rgba(244,121,32,0.22);
}
.model-sub {
  font-size: 12px; font-weight: 400; letter-spacing: 0.04em;
  color: var(--muted); margin-bottom: 0.5rem;
  font-family: 'JetBrains Mono', monospace;
}
.model-item h3 { font-size: 1.35rem; font-weight: 500; color: var(--text); margin-bottom: 1rem; letter-spacing: -0.01em; }
.model-item p { font-size: 15px; color: var(--text-soft); line-height: 1.8; max-width: 660px; }
.model-item p strong { color: var(--text); font-weight: 500; }
.model-item ul {
  margin-top: 1.1rem; list-style: none;
  display: flex; flex-direction: column; gap: 0.5rem; max-width: 660px;
}
.model-item ul li {
  font-size: 14px; color: var(--text-soft); padding-left: 1.25rem;
  position: relative; line-height: 1.65;
  font-family: 'JetBrains Mono', monospace; letter-spacing: -0.005em;
}
.model-item ul li::before {
  content: '›'; position: absolute; left: 0;
  color: var(--orange); font-size: 14px; top: 0;
}

/* ─── THEORY ─── */
.theory-grid {
  display: grid; grid-template-columns: repeat(4, 1fr);
  gap: 1rem; margin-top: 2rem;
}
.tcard {
  background: var(--bg-card); border: 1px solid var(--border); border-radius: 6px;
  padding: 1.6rem 1.55rem;
  transition: border-color 0.2s, background 0.2s;
}
.tcard:hover { border-color: var(--border-strong); background: var(--bg-elev); }
.tcard-year {
  font-size: 10.5px; color: var(--orange); margin-bottom: 0.65rem;
  letter-spacing: 0.05em;
}
.tcard h4 { font-size: 0.95rem; font-weight: 500; color: var(--text); margin-bottom: 0.7rem; line-height: 1.3; }
.tcard p { font-size: 13px; color: var(--text-soft); line-height: 1.75; }
.tcard-role {
  display: inline-block; margin-top: 1rem;
  font-family: 'JetBrains Mono', monospace; font-size: 10.5px; font-weight: 400;
  color: var(--muted); letter-spacing: 0.02em; line-height: 1.5;
  padding-top: 0.85rem; border-top: 1px dashed var(--border);
  width: 100%;
}
.theory-claim {
  margin-top: 2.25rem; padding: 1.65rem 1.85rem;
  background: var(--bg-elev); border: 1px solid var(--border); border-radius: 6px;
  font-size: 15px; color: var(--text-soft); line-height: 1.75;
  position: relative; overflow: hidden;
}
.theory-claim::before {
  content: ''; position: absolute; left: 0; top: 0; bottom: 0;
  width: 2px; background: var(--orange);
}
.theory-claim strong { color: var(--text); font-weight: 500; }

/* ─── TIMELINE ─── */
.timeline { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.25rem; margin-top: 2rem; }
.tl-card {
  background: var(--bg-card); border: 1px solid var(--border); border-radius: 6px;
  padding: 1.85rem 1.7rem;
  transition: border-color 0.2s;
  position: relative;
}
.tl-card:hover { border-color: var(--border-strong); }
.tl-period {
  font-size: 10.5px; font-weight: 500;
  letter-spacing: 0.08em; text-transform: uppercase; color: var(--orange); margin-bottom: 0.75rem;
  display: flex; align-items: center; gap: 0.5rem;
}
.tl-period::after { content: ''; flex: 1; height: 1px; background: rgba(244,121,32,0.25); }
.tl-title {
  font-family: 'Outfit', sans-serif; font-size: 1.05rem; font-weight: 500;
  color: var(--text); margin-bottom: 1.1rem; letter-spacing: -0.005em; line-height: 1.35;
}
.tl-list { list-style: none; display: flex; flex-direction: column; gap: 0.6rem; }
.tl-list li {
  font-size: 13.5px; color: var(--text-soft); padding-left: 1.1rem;
  position: relative; line-height: 1.6;
}
.tl-list li::before {
  content: '·'; position: absolute; left: 0; color: var(--orange);
  font-size: 18px; top: -3px;
}

/* ─── CTA ─── */
.cta-section {
  padding: 6rem 0;
  background:
    radial-gradient(circle at 80% 50%, rgba(244,121,32,0.07), transparent 50%),
    var(--bg);
  border-bottom: 1px solid var(--border);
}
.cta-inner { max-width: 640px; }
.cta-inner h2 {
  font-size: clamp(1.8rem, 3vw, 2.6rem); font-weight: 400;
  line-height: 1.22; color: var(--text); margin-bottom: 1.1rem; letter-spacing: -0.015em;
}
.cta-inner p { font-size: 16px; color: var(--text-soft); margin-bottom: 2.5rem; line-height: 1.8; font-weight: 300; }
.cta-form { display: flex; gap: 0.6rem; flex-wrap: wrap; }
.cta-input {
  flex: 1; min-width: 240px; padding: 0.95rem 1.2rem;
  border: 1px solid var(--border-strong); border-radius: 4px;
  font-size: 15px; font-family: 'DM Sans', sans-serif;
  background: var(--bg-card); color: var(--text); outline: none;
  transition: border-color 0.2s, background 0.2s;
}
.cta-input:focus { border-color: var(--orange); background: var(--bg-elev); }
.cta-input::placeholder { color: var(--dim); }
.cta-btn {
  padding: 0.95rem 1.7rem; background: var(--orange); color: #0A0A0B;
  border: none; border-radius: 4px; font-size: 15px;
  font-family: 'Outfit', sans-serif; font-weight: 500;
  cursor: pointer; transition: filter 0.18s; letter-spacing: 0.01em; white-space: nowrap;
}
.cta-btn:hover { filter: brightness(1.08); }
.cta-note { margin-top: 1.1rem; font-size: 12.5px; color: var(--muted); font-family: 'JetBrains Mono', monospace; letter-spacing: 0.02em; }

/* ─── CONTACT FORM ─── */
.contact-form { display: grid; grid-template-columns: 1fr 1fr; gap: 0.85rem; margin-top: 0.5rem; }
.contact-form .field-full { grid-column: 1 / -1; }
.contact-form label {
  display: block; font-size: 11px; font-weight: 500; letter-spacing: 0.08em;
  text-transform: uppercase; color: var(--muted); margin-bottom: 0.4rem;
  font-family: 'JetBrains Mono', monospace;
}
.contact-form label .req { color: var(--orange); margin-left: 0.15rem; }
.contact-form input,
.contact-form textarea,
.contact-form select {
  width: 100%; padding: 0.85rem 1rem;
  border: 1px solid var(--border-strong); border-radius: 4px;
  font-size: 14.5px; font-family: 'DM Sans', sans-serif;
  background: var(--bg-card); color: var(--text); outline: none;
  transition: border-color 0.2s, background 0.2s;
}
.contact-form input:focus,
.contact-form textarea:focus,
.contact-form select:focus { border-color: var(--orange); background: var(--bg-elev); }
.contact-form input::placeholder,
.contact-form textarea::placeholder { color: var(--dim); }
.contact-form textarea { min-height: 140px; resize: vertical; line-height: 1.65; }
.contact-form .submit-row { grid-column: 1 / -1; display: flex; align-items: center; justify-content: space-between; gap: 1rem; flex-wrap: wrap; margin-top: 0.5rem; }
.contact-form .cta-btn { padding: 0.95rem 1.7rem; background: var(--orange); color: #0A0A0B; border: none; border-radius: 4px; font-size: 15px; font-family: 'Outfit', sans-serif; font-weight: 500; cursor: pointer; transition: filter 0.18s; letter-spacing: 0.01em; }
.contact-form .cta-btn:hover { filter: brightness(1.08); }
.contact-form .cta-btn:disabled { opacity: 0.6; cursor: not-allowed; }
.form-fineprint { font-size: 12px; color: var(--muted); font-family: 'JetBrains Mono', monospace; letter-spacing: 0.02em; }
.form-fineprint a { color: var(--orange); text-decoration: none; border-bottom: 1px dashed var(--orange); }
#form-message {
  grid-column: 1 / -1;
  background: var(--bg-card) !important; color: var(--text) !important;
  border: 1px solid var(--border-strong) !important; border-left: 2px solid var(--orange) !important;
  border-radius: 4px !important; padding: 0.9rem 1.1rem !important;
  font-size: 13.5px !important; font-family: 'JetBrains Mono', monospace !important;
}
@media (max-width: 640px) {
  .contact-form { grid-template-columns: 1fr; }
}

/* ─── COOKIE POLICY PAGE ─── */
.policy-page { padding: 7rem 2rem 6rem; max-width: 880px; margin: 0 auto; }
.policy-page h1 {
  font-size: clamp(1.9rem, 3.5vw, 2.6rem); font-weight: 400;
  letter-spacing: -0.015em; line-height: 1.18; color: var(--text);
  margin-bottom: 0.85rem;
}
.policy-page .lede { font-size: 1.02rem; color: var(--text-soft); line-height: 1.8; max-width: 640px; margin-bottom: 3rem; font-weight: 300; }
.policy-page h2 {
  font-family: 'Outfit', sans-serif; font-size: 1.2rem; font-weight: 500;
  color: var(--text); margin-top: 2.6rem; margin-bottom: 1rem; letter-spacing: -0.005em;
  padding-top: 1.2rem; border-top: 1px solid var(--border);
}
.policy-page p { font-size: 15px; color: var(--text-soft); line-height: 1.8; margin-bottom: 1rem; }
.policy-page ul { list-style: none; padding: 0; margin: 1rem 0 1.4rem; }
.policy-page ul li { font-size: 14.5px; color: var(--text-soft); line-height: 1.75; padding-left: 1.2rem; position: relative; margin-bottom: 0.55rem; }
.policy-page ul li::before { content: '›'; color: var(--orange); position: absolute; left: 0; top: 0; }
.policy-page strong { color: var(--text); font-weight: 500; }
.policy-page .updated { font-family: 'JetBrains Mono', monospace; font-size: 12px; color: var(--muted); letter-spacing: 0.04em; margin-bottom: 2rem; display: block; }
.footer-links { display: flex; gap: 1.25rem; align-items: center; flex-wrap: wrap; }
.footer-links a { font-size: 12.5px; color: var(--muted); text-decoration: none; transition: color 0.18s; }
.footer-links a:hover { color: var(--text); }
.footer-links .sep { color: var(--dim); }

/* ─── FOOTER ─── */
footer { background: #050506; padding: 2.75rem 0; }
.footer-inner { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 1rem; }
.footer-logo img { height: 22px; opacity: 0.5; display: block; }
.footer-right { display: flex; flex-direction: column; align-items: flex-end; gap: 0.35rem; }
.footer-tag { font-family: 'JetBrains Mono', monospace; font-size: 11px; color: var(--muted); letter-spacing: 0.04em; }
.footer-copy { font-family: 'JetBrains Mono', monospace; font-size: 11px; color: var(--dim); }

/* ─── LANGUAGE ─── */
body:not(.en) .en-text,
body:not(.en) .en-block { display: none !important; }
body.en .tr-text,
body.en .tr-block { display: none !important; }

/* ─── RESPONSIVE ─── */
@media (max-width: 900px) {
  .theory-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 800px) {
  .problem-grid { grid-template-columns: 1fr; }
  .timeline { grid-template-columns: 1fr; }
  .theory-grid { grid-template-columns: 1fr; }
  .model-item { grid-template-columns: 64px 1fr; gap: 1.25rem; padding: 2rem 0; }
  .nav-inner { padding: 1rem 1.25rem; }
  .hero { padding: 4.5rem 1.5rem 4rem; }
  .container { padding: 0 1.5rem; }
  .hero-meta { gap: 1.25rem; }
}