/* ================================================
 *  DALTONMARTIN — Vehicle Detail (Aston Martin style)
 * ================================================ */

*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; font-size: 16px; }

body {
  font-family: "Helvetica Neue", Arial, "Hiragino Kaku Gothic ProN", "Hiragino Sans", Meiryo, sans-serif;
  color: #fff;
  background: #000;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

/* ── Top Header (transparent, overlays hero) ── */
.top-bar {
  position: fixed;
  top: 0; left: 0; width: 100%;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 clamp(24px, 4vw, 64px);
  z-index: 1000;
  background: transparent;
  transition: background 0.4s ease;
}

.top-bar.scrolled {
  background: rgba(0, 0, 0, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
}

.top-bar--dark {
  background: rgba(0, 0, 0, 0.85);
}

.top-bar .logo {
  font-weight: 900;
  font-size: 1rem;
  letter-spacing: 0.18em;
  text-decoration: none;
  color: #fff;
}

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

.top-bar-right a {
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  text-decoration: none;
  color: rgba(255,255,255,0.7);
  transition: color 0.3s;
}

.top-bar-right a:hover { color: #fff; }

.btn-cta-green {
  display: inline-block;
  padding: 10px 24px;
  background: #00665e;
  color: #fff;
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-decoration: none;
  border: none;
  transition: background 0.3s;
}

.btn-cta-green:hover { background: #008578; }

.btn-cta-outline {
  display: inline-block;
  padding: 10px 24px;
  background: transparent;
  color: #fff;
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-decoration: none;
  border: 1px solid rgba(255,255,255,0.4);
  transition: background 0.3s, border-color 0.3s;
}

.btn-cta-outline:hover {
  background: rgba(255,255,255,0.1);
  border-color: rgba(255,255,255,0.7);
}

/* ── Mobile Menu ── */
.mob-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
  z-index: 1001;
}

.mob-toggle span {
  display: block; width: 22px; height: 1.5px; background: #fff;
  transition: transform 0.3s, opacity 0.3s;
}

.mob-toggle.active span:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
.mob-toggle.active span:nth-child(2) { opacity: 0; }
.mob-toggle.active span:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }

.mob-nav {
  display: none;
  position: fixed; inset: 0;
  background: rgba(0,0,0,0.97);
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 36px;
  z-index: 999;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s;
}

.mob-nav.open { opacity: 1; pointer-events: auto; }

.mob-nav a {
  font-size: 1.1rem; letter-spacing: 0.15em;
  text-decoration: none; color: #fff; font-weight: 500;
}

/* ── HERO: full-bleed background image ── */
.hero {
  position: relative;
  width: 100%;
  height: 100vh;
  min-height: 600px;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  left: 100;
  top: -10%;
  width: 100%;
  height: 120%;
  z-index: 0;
  will-change: transform;
}

.hero-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: left bottom;
}

/* Page-specific hero tweaks via body class */
body.flip-hero .hero-bg img { transform: scaleX(-1); }

/* subtle gradient overlay at bottom for text legibility */
.hero-bg::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(
    to top,
    rgba(0,0,0,0.75) 0%,
    rgba(0,0,0,0.5) 40%,
    rgba(0,0,0,0.2) 100%
  );
}

.hero-content {
  position: absolute;
  bottom: 100px;
  left: clamp(24px, 5vw, 80px);
  z-index: 2;
}

.hero-tagline {
  font-size: 0.85rem;
  letter-spacing: 0.35em;
  color: rgba(255,255,255,0.75);
  margin-bottom: 16px;
  opacity: 0;
  transform: translateY(20px);
  animation: fadeUp 0.8s ease forwards 0.4s;
}

.hero-title {
  font-size: clamp(3rem, 7vw, 5.5rem);
  font-weight: 300;
  letter-spacing: 0.02em;
  line-height: 1.05;
  opacity: 0;
  transform: translateY(20px);
  animation: fadeUp 0.8s ease forwards 0.7s;
}

.hero-title .model-switch {
  display: inline-block;
  cursor: default;
  position: relative;
}

.hero-title .model-switch::after {
  content: '\2304';
  font-size: 0.6em;
  margin-left: 12px;
  opacity: 0.5;
}

.hero-buttons {
  display: flex;
  gap: 16px;
  margin-top: 36px;
  opacity: 0;
  transform: translateY(20px);
  animation: fadeUp 0.8s ease forwards 1s;
}

.hero-btn-primary {
  padding: 14px 36px;
  background: #fff;
  color: #000;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-decoration: none;
  border: none;
  transition: background 0.3s;
}

.hero-btn-primary:hover { background: #e0e0e0; }

.hero-btn-secondary {
  padding: 14px 36px;
  background: rgba(255,255,255,0.12);
  color: #fff;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-decoration: none;
  border: 1px solid rgba(255,255,255,0.3);
  transition: background 0.3s, border-color 0.3s;
}

.hero-btn-secondary:hover {
  background: rgba(255,255,255,0.2);
  border-color: rgba(255,255,255,0.6);
}

/* ── Section Navigation (sticky under header) ── */
.section-nav {
  position: sticky;
  top: 60px;
  z-index: 900;
  background: #000;
  border-bottom: 1px solid rgba(255,255,255,0.08);
  display: flex;
  align-items: center;
  gap: 0;
  padding: 0 clamp(24px, 5vw, 80px);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.section-nav a {
  flex-shrink: 0;
  padding: 18px 24px;
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  color: rgba(255,255,255,0.45);
  text-decoration: none;
  border-bottom: 2px solid transparent;
  transition: color 0.3s, border-color 0.3s;
}

.section-nav a:hover { color: rgba(255,255,255,0.8); }

.section-nav a.active {
  color: #fff;
  border-bottom-color: #fff;
}

/* ── Performance Specs (3 big numbers) ── */
.perf {
  background: #000;
  padding: 80px clamp(24px, 5vw, 80px);
}

.perf-grid {
  max-width: 960px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
}

.perf-item {
  text-align: center;
  padding: 40px 20px;
  border-right: 1px solid rgba(255,255,255,0.08);
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

.perf-item:last-child { border-right: none; }
.perf-item.visible { opacity: 1; transform: translateY(0); }

.perf-value {
  font-size: clamp(2.8rem, 5vw, 4.5rem);
  font-weight: 200;
  letter-spacing: -0.02em;
  line-height: 1;
}

.perf-unit {
  font-size: 0.9rem;
  font-weight: 400;
  color: rgba(255,255,255,0.4);
  margin-left: 4px;
}

.perf-label {
  font-size: 0.65rem;
  letter-spacing: 0.2em;
  color: rgba(255,255,255,0.35);
  margin-top: 12px;
  text-transform: uppercase;
}

.perf-detail-toggle {
  max-width: 960px;
  margin: 0 auto;
  padding-top: 32px;
  text-align: center;
}

.perf-detail-toggle button {
  background: none;
  border: 1px solid rgba(255,255,255,0.2);
  color: rgba(255,255,255,0.6);
  padding: 12px 32px;
  font-size: 0.7rem;
  letter-spacing: 0.15em;
  cursor: pointer;
  transition: border-color 0.3s, color 0.3s;
}

.perf-detail-toggle button:hover {
  border-color: rgba(255,255,255,0.5);
  color: #fff;
}

/* ── Engineering Section (hero image + tile cards) ── */
.eng-hero {
  position: relative;
  height: 60vh;
  min-height: 400px;
  overflow: hidden;
  display: flex;
  align-items: flex-end;
}

.eng-hero-bg {
  position: absolute;
  inset: 0;
  background: #111;
}

.eng-hero-bg img {
  width: 100%; height: 100%;
  object-fit: cover;
  opacity: 0.6;
}

.eng-hero-content {
  position: relative;
  z-index: 2;
  padding: 60px clamp(24px, 5vw, 80px);
}

.eng-hero-label {
  font-size: 0.6rem;
  letter-spacing: 0.4em;
  color: rgba(255,255,255,0.4);
  margin-bottom: 16px;
}

.eng-hero-heading {
  font-size: clamp(1.8rem, 4vw, 3rem);
  font-weight: 300;
  line-height: 1.3;
  max-width: 600px;
}

.eng-tiles {
  background: #000;
  padding: 0 clamp(24px, 5vw, 80px) 80px;
}

.eng-tile-grid {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2px;
}

.eng-tile {
  position: relative;
  background: #111;
  padding: 48px 32px;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  overflow: hidden;
  cursor: default;
  transition: background 0.4s;
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s ease, transform 0.8s ease, background 0.4s;
}

.eng-tile.visible { opacity: 1; transform: translateY(0); }
.eng-tile:hover { background: #1a1a1a; }

.eng-tile-title {
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  margin-bottom: 12px;
}

.eng-tile-desc {
  font-size: 0.78rem;
  line-height: 1.8;
  color: rgba(255,255,255,0.45);
}

.eng-tile-more {
  display: inline-block;
  margin-top: 16px;
  font-size: 0.65rem;
  letter-spacing: 0.15em;
  color: #00665e;
  font-weight: 600;
  transition: color 0.3s;
}

.eng-tile:hover .eng-tile-more { color: #00c4b0; }

/* ── Full-width dark section with text ── */
.dark-section {
  background: #000;
  padding: 100px clamp(24px, 5vw, 80px);
}

.dark-section-inner {
  max-width: 960px;
  margin: 0 auto;
}

.dark-section-label {
  font-size: 0.6rem;
  letter-spacing: 0.4em;
  color: rgba(255,255,255,0.3);
  margin-bottom: 20px;
}

.dark-section-heading {
  font-size: clamp(1.6rem, 3.5vw, 2.6rem);
  font-weight: 300;
  line-height: 1.4;
  margin-bottom: 32px;
}

.dark-section-text {
  font-size: 0.9rem;
  line-height: 2;
  color: rgba(255,255,255,0.55);
  max-width: 600px;
}

.dark-section-text p + p { margin-top: 16px; }

/* ── Spec Tables ── */
.spec-tables {
  background: #000;
  padding: 80px clamp(24px, 5vw, 80px);
}

.spec-tables-inner {
  max-width: 960px;
  margin: 0 auto;
}

.spec-group { margin-bottom: 48px; }
.spec-group:last-child { margin-bottom: 0; }

.spec-group-title {
  font-size: 0.65rem;
  letter-spacing: 0.3em;
  color: rgba(255,255,255,0.3);
  padding-bottom: 16px;
  border-bottom: 1px solid rgba(255,255,255,0.08);
  margin-bottom: 0;
}

.spec-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: 18px 0;
  border-bottom: 1px solid rgba(255,255,255,0.05);
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.spec-row.visible { opacity: 1; transform: translateY(0); }

.spec-row-label {
  font-size: 0.85rem;
  color: rgba(255,255,255,0.5);
  font-weight: 400;
}

.spec-row-value {
  font-size: 0.9rem;
  font-weight: 500;
  letter-spacing: 0.02em;
}

/* ── Bottom CTA Grid (4 cards) ── */
.bottom-grid {
  background: #0a0a0a;
  padding: 80px clamp(24px, 5vw, 80px);
}

.bottom-grid-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2px;
}

.bottom-card {
  position: relative;
  background: #111;
  min-height: 280px;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 32px;
  text-decoration: none;
  color: #fff;
  overflow: hidden;
  transition: background 0.3s;
}

.bottom-card:hover { background: #1a1a1a; }

.bottom-card-label {
  font-size: 0.6rem;
  letter-spacing: 0.25em;
  color: rgba(255,255,255,0.35);
  margin-bottom: 8px;
}

.bottom-card-title {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 16px;
}

.bottom-card-cta {
  font-size: 0.65rem;
  letter-spacing: 0.15em;
  color: #00665e;
  font-weight: 600;
}

.bottom-card:hover .bottom-card-cta { color: #00c4b0; }

/* ── Footer ── */
.vd-footer {
  background: #000;
  border-top: 1px solid rgba(255,255,255,0.06);
  padding: 48px clamp(24px, 5vw, 80px);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.vd-footer .logo {
  font-weight: 900;
  font-size: 0.9rem;
  letter-spacing: 0.18em;
  color: #fff;
  text-decoration: none;
  display: block;
  margin-bottom: 8px;
}

.vd-footer .copyright {
  font-size: 0.7rem;
  color: rgba(255,255,255,0.2);
  letter-spacing: 0.04em;
}

.back-link {
  font-size: 0.7rem;
  letter-spacing: 0.15em;
  color: rgba(255,255,255,0.4);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  line-height: 1;
  gap: 8px;
  transition: color 0.3s;
}

.back-link:hover { color: #fff; }
.back-link::before { content: none; }

.vd-footer .back-link[href*="orientation.html"] {
  position: relative;
  top: -1px;
}

/* ── Keyframes ── */
@keyframes fadeUp {
  to { opacity: 1; transform: translateY(0); }
}

@keyframes scrollDown {
  0%   { top: -100%; }
  100% { top: 100%; }
}

/* ── Responsive ── */
@media (max-width: 1024px) {
  .bottom-grid-inner { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .top-bar-right a:not(.btn-cta-green) { display: none; }
  .mob-toggle { display: flex; }
  .mob-nav { display: flex; }

  .hero { height: 100svh; }
  .hero-content { bottom: 60px; }
  .hero-title { font-size: clamp(2.2rem, 10vw, 3.5rem); }

  .section-nav { top: 60px; }
  .section-nav a { padding: 14px 16px; font-size: 0.65rem; }

  .perf-grid { grid-template-columns: 1fr; gap: 0; }
  .perf-item { border-right: none; border-bottom: 1px solid rgba(255,255,255,0.06); padding: 32px 20px; }
  .perf-item:last-child { border-bottom: none; }

  .eng-tile-grid { grid-template-columns: 1fr; }
  .eng-hero { height: 40vh; min-height: 280px; }

  .bottom-grid-inner { grid-template-columns: 1fr; }
  .bottom-card { min-height: 200px; }

  .vd-footer { flex-direction: column; gap: 24px; text-align: center; }
}