/* ============================================
   DRIVE LINE MOTORS — Main Stylesheet
   ============================================
   Edit CSS variables in :root to customize colors,
   fonts, spacing globally. Dark mode is automatic.
   ============================================ */

/* ── Google Fonts ─────────────────────────── */
@import url('https://fonts.googleapis.com/css2?family=Cormorant+Garamond:ital,wght@0,300;0,400;0,600;1,300;1,400&family=DM+Sans:wght@300;400;500;600&display=swap');

/* ── CSS Variables ────────────────────────── */
:root {
  /* Colors */
  --c-bg:          #0a0a0a;
  --c-surface:     #121212;
  --c-surface2:    #1a1a1a;
  --c-border:      rgba(255,255,255,0.08);
  --c-text:        #f0ede8;
  --c-text-muted:  #8a8a8a;
  --c-accent:      #22c55e;       /* ← Emerald green — change here */
  --c-accent-dim:  rgba(34,197,94,0.12);
  --c-accent-glow: rgba(34,197,94,0.25);

  /* Typography */
  --font-display: 'Cormorant Garamond', Georgia, serif;
  --font-body:    'DM Sans', system-ui, sans-serif;

  /* Spacing scale */
  --space-xs:  0.5rem;
  --space-sm:  1rem;
  --space-md:  2rem;
  --space-lg:  4rem;
  --space-xl:  8rem;

  /* Transitions */
  --ease:      cubic-bezier(0.25, 0.46, 0.45, 0.94);
  --ease-out:  cubic-bezier(0.16, 1, 0.3, 1);

  /* Layout */
  --navbar-h: 72px;
  --max-w:    1280px;
  --radius:   4px;
  --radius-lg:12px;
}

/* Light mode override */
@media (prefers-color-scheme: light) {
  :root {
    --c-bg:         #f7f5f2;
    --c-surface:    #ffffff;
    --c-surface2:   #f0ede8;
    --c-border:     rgba(0,0,0,0.08);
    --c-text:       #0a0a0a;
    --c-text-muted: #6b6b6b;
    --c-accent-dim: rgba(22,163,74,0.08);
    --c-accent-glow:rgba(22,163,74,0.18);
  }
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-body);
  background: var(--c-bg);
  color: var(--c-text);
  line-height: 1.7;
  overflow-x: hidden;
  min-height: 100vh;
}

/* RTL support */
[dir="rtl"] body { font-family: 'DM Sans', 'Segoe UI', Tahoma, Arial, sans-serif; }

img { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
button { cursor: pointer; border: none; background: none; font-family: inherit; color: inherit; }

/* ── Typography ───────────────────────────── */
h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 300;
  line-height: 1.15;
  letter-spacing: -0.01em;
}

h1 { font-size: clamp(2.8rem, 7vw, 6rem); }
h2 { font-size: clamp(2rem, 4vw, 3.5rem); }
h3 { font-size: clamp(1.3rem, 2.5vw, 1.9rem); }
h4 { font-size: 1.1rem; font-weight: 400; }

p { color: var(--c-text-muted); max-width: 65ch; }

/* ── Layout Helpers ───────────────────────── */
.container {
  width: 100%;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 var(--space-md);
}

.section {
  padding: var(--space-xl) 0;
  text-align: center;
}

.section-label {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--c-accent);
  margin-bottom: var(--space-sm);
}

.section-title {
  margin-bottom: var(--space-sm);
  color: var(--c-text);
}

.section-subtitle {
  font-size: 1.05rem;
  color: var(--c-text-muted);
  max-width: 55ch;
  margin: 0 auto var(--space-lg);
}

/* ── Navbar ───────────────────────────────── */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  height: var(--navbar-h);
  display: flex;
  align-items: center;
  background: rgba(10,10,10,0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--c-border);
  transition: background 0.3s var(--ease), border-color 0.3s var(--ease);
}

@media (prefers-color-scheme: light) {
  .navbar { background: rgba(247,245,242,0.9); }
}

.navbar.scrolled { background: var(--c-bg); border-color: var(--c-border); }

.navbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 var(--space-md);
  position: relative;
}

/* Hamburger — left */
.hamburger {
  display: flex;
  flex-direction: column;
  gap: 5px;
  width: 28px;
  padding: 4px 0;
  z-index: 1001;
  flex-shrink: 0;
  aria-label: "Toggle menu";
}

.hamburger span {
  display: block;
  height: 1.5px;
  background: var(--c-text);
  border-radius: 2px;
  transition: transform 0.4s var(--ease-out), opacity 0.3s, width 0.3s;
  transform-origin: left center;
}

.hamburger span:nth-child(2) { width: 18px; }

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

/* Logo — center */
.navbar-logo {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  line-height: 1;
  text-align: center;
}

.logo-wordmark {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--c-text);
  white-space: nowrap;
}

.logo-wordmark span { color: var(--c-accent); }

.logo-tagline {
  font-size: 0.55rem;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--c-text-muted);
  margin-top: 2px;
}

/* Language switcher — right */
.lang-switcher {
  position: relative;
  flex-shrink: 0;
}

.lang-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.05em;
  color: var(--c-text-muted);
  padding: 6px 12px;
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  transition: color 0.2s, border-color 0.2s;
}

.lang-btn:hover { color: var(--c-text); border-color: var(--c-accent); }

.lang-btn svg { transition: transform 0.3s var(--ease); }
.lang-btn[aria-expanded="true"] svg { transform: rotate(180deg); }

.lang-dropdown {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  min-width: 130px;
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  opacity: 0;
  pointer-events: none;
  transform: translateY(-8px);
  transition: opacity 0.25s var(--ease), transform 0.25s var(--ease);
  box-shadow: 0 20px 40px rgba(0,0,0,0.4);
  text-align: center;
}

[dir="rtl"] .lang-dropdown { right: auto; left: 0; }

.lang-dropdown.open { opacity: 1; pointer-events: all; transform: translateY(0); }

.lang-dropdown a {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 16px;
  font-size: 0.85rem;
  color: var(--c-text-muted);
  transition: background 0.2s, color 0.2s;
}

.lang-dropdown a:hover { background: var(--c-accent-dim); color: var(--c-text); }
.lang-dropdown a.active { color: var(--c-accent); }

/* Nav menu */
.nav-menu {
  position: fixed;
  top: 0; left: 0;
  width: min(340px, 90vw);
  height: 100dvh;
  background: var(--c-surface);
  border-right: 1px solid var(--c-border);
  z-index: 999;
  transform: translateX(-100%);
  transition: transform 0.5s var(--ease-out);
  display: flex;
  flex-direction: column;
  padding-top: var(--navbar-h);
}

.nav-menu.open { transform: translateX(0); }

.nav-menu-inner { padding: var(--space-lg) var(--space-md); flex: 1; overflow-y: auto; }

.nav-links-list { display: flex; flex-direction: column; gap: 4px; }

.nav-links-list a {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  font-size: 1rem;
  font-weight: 400;
  color: var(--c-text-muted);
  border-radius: var(--radius);
  transition: color 0.2s, background 0.2s, padding-left 0.3s;
  letter-spacing: 0.02em;
}

.nav-links-list a:hover,
.nav-links-list a.active {
  color: var(--c-text);
  background: var(--c-accent-dim);
  padding-left: 20px;
}

.nav-links-list a .nav-num {
  font-family: var(--font-display);
  font-size: 0.75rem;
  color: var(--c-accent);
  min-width: 20px;
}

.nav-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.6);
  backdrop-filter: blur(4px);
  z-index: 998;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.4s;
}

.nav-overlay.open { opacity: 1; pointer-events: all; }

/* Pre-order floating button */
.preorder-btn {
  position: fixed;
  bottom: var(--space-md);
  right: var(--space-md);
  z-index: 900;
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--c-accent);
  color: #fff;
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 12px 20px;
  border-radius: 100px;
  box-shadow: 0 8px 32px var(--c-accent-glow);
  transition: transform 0.25s var(--ease-out), box-shadow 0.25s;
  animation: floatBtn 3s ease-in-out infinite;
}

[dir="rtl"] .preorder-btn { right: auto; left: var(--space-md); }

.preorder-btn:hover {
  transform: translateY(-2px) scale(1.02);
  box-shadow: 0 12px 40px var(--c-accent-glow);
}

@keyframes floatBtn {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-4px); }
}

/* Scroll to top button */
.scroll-top {
  position: fixed;
  bottom: var(--space-md);
  left: var(--space-md);
  z-index: 900;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transform: translateY(16px);
  transition: opacity 0.3s, transform 0.3s var(--ease-out);
  color: var(--c-text-muted);
}

[dir="rtl"] .scroll-top { left: auto; right: var(--space-md); }

.scroll-top:hover { color: var(--c-accent); border-color: var(--c-accent); }
.scroll-top.visible { opacity: 1; pointer-events: all; transform: translateY(0); }

/* ── Buttons ──────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  border-radius: var(--radius);
  transition: all 0.3s var(--ease-out);
  position: relative;
  overflow: hidden;
}

.btn::after {
  content: '';
  position: absolute;
  inset: 0;
  background: rgba(255,255,255,0.06);
  opacity: 0;
  transition: opacity 0.2s;
}

.btn:hover::after { opacity: 1; }

.btn-primary {
  background: var(--c-accent);
  color: #fff;
  box-shadow: 0 4px 20px var(--c-accent-glow);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 32px var(--c-accent-glow);
}

.btn-outline {
  border: 1px solid var(--c-border);
  color: var(--c-text);
}

.btn-outline:hover {
  border-color: var(--c-accent);
  color: var(--c-accent);
  transform: translateY(-2px);
}

/* ── Scroll Animations ────────────────────── */
.reveal {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.8s var(--ease-out), transform 0.8s var(--ease-out);
}

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

.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }
.reveal-delay-4 { transition-delay: 0.4s; }

/* ── Divider ──────────────────────────────── */
.divider {
  width: 48px;
  height: 1px;
  background: var(--c-accent);
  margin: var(--space-sm) auto;
  opacity: 0.6;
}

/* ── Footer ───────────────────────────────── */
.footer {
  border-top: 1px solid var(--c-border);
  padding: var(--space-lg) 0 var(--space-md);
  text-align: center;
}

.footer-logo {
  font-family: var(--font-display);
  font-size: 1.4rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-bottom: var(--space-sm);
}

.footer-logo span { color: var(--c-accent); }

.footer-links {
  display: flex;
  justify-content: center;
  gap: var(--space-md);
  flex-wrap: wrap;
  margin-bottom: var(--space-md);
}

.footer-links a {
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  color: var(--c-text-muted);
  text-transform: uppercase;
  transition: color 0.2s;
}

.footer-links a:hover { color: var(--c-accent); }

.footer-copy {
  font-size: 0.78rem;
  color: var(--c-text-muted);
  opacity: 0.6;
  text-align: center;
  width: 100%;
  max-width: 100%;
  display: block;
  margin-left: auto;
  margin-right: auto;
}

/* ── Focus Styles ─────────────────────────── */
:focus-visible {
  outline: 2px solid var(--c-accent);
  outline-offset: 3px;
  border-radius: 2px;
}

/* ── Utility ──────────────────────────────── */
.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border: 0;
}

/* ── Responsive ───────────────────────────── */
@media (max-width: 768px) {
  :root { --space-xl: 5rem; --space-lg: 3rem; }
  .preorder-btn { bottom: 16px; right: 16px; padding: 10px 16px; font-size: 0.72rem; }
  [dir="rtl"] .preorder-btn { left: 16px; right: auto; }
  .scroll-top { bottom: 16px; left: 16px; }
  [dir="rtl"] .scroll-top { left: auto; right: 16px; }
}

/* Fix small-screen navbar: logo can overlap lang-btn */
@media (max-width: 480px) {
  .navbar-inner { padding: 0 12px; }
  .logo-wordmark { font-size: 0.95rem; letter-spacing: 0.06em; }
  .logo-tagline { display: none; }
  .lang-btn { padding: 5px 8px; font-size: 0.72rem; gap: 3px; }
  .lang-btn svg:first-child { display: none; } /* hide globe icon on very small */
}