/* =============================================
   AUTO SERVICE YUGO — Base / Design Tokens
   ============================================= */

:root {
  /* === PALETTE === */
  --color-bg:               #0e0d0c;
  --color-surface:          #151412;
  --color-surface-2:        #1c1a18;
  --color-surface-offset:   #221f1c;
  --color-surface-dynamic:  #2c2926;
  --color-divider:          #2f2b28;
  --color-border:           #3d3835;

  --color-text:             #edeae5;
  --color-text-muted:       #8a8580;
  --color-text-faint:       #4d4a46;
  --color-text-inverse:     #0e0d0c;

  /* Amber — automotive energy */
  --color-accent:           #e8640a;
  --color-accent-hover:     #d4550a;
  --color-accent-dark:      #b84408;
  --color-accent-subtle:    rgba(232, 100, 10, 0.10);
  --color-accent-glow:      rgba(232, 100, 10, 0.22);

  /* Light mode overrides */
  --color-bg-light:         #f4f2ee;
  --color-surface-light:    #faf9f7;
  --color-text-light:       #1a1815;
  --color-text-muted-light: #6b6760;

  /* === TYPE SCALE === */
  --text-xs:   clamp(0.75rem,  0.7rem  + 0.25vw, 0.875rem);
  --text-sm:   clamp(0.875rem, 0.8rem  + 0.35vw, 1rem);
  --text-base: clamp(1rem,     0.95rem + 0.25vw, 1.125rem);
  --text-lg:   clamp(1.125rem, 1rem    + 0.75vw, 1.5rem);
  --text-xl:   clamp(1.5rem,   1.2rem  + 1.25vw, 2.25rem);
  --text-2xl:  clamp(2rem,     1.2rem  + 2.5vw,  3.5rem);
  --text-3xl:  clamp(2.5rem,   1rem    + 4vw,    5rem);
  --text-hero: clamp(3rem,     0.5rem  + 7vw,    7.5rem);

  /* === SPACING === */
  --s1:  0.25rem;  --s2:  0.5rem;   --s3:  0.75rem;
  --s4:  1rem;     --s5:  1.25rem;  --s6:  1.5rem;
  --s8:  2rem;     --s10: 2.5rem;   --s12: 3rem;
  --s16: 4rem;     --s20: 5rem;     --s24: 6rem;
  --s32: 8rem;

  /* === FONT === */
  --font-display: 'Clash Display', 'Helvetica Neue', sans-serif;
  --font-body:    'Satoshi', 'Inter', sans-serif;

  /* === MISC === */
  --radius-sm:   0.375rem;
  --radius-md:   0.5rem;
  --radius-lg:   0.75rem;
  --radius-xl:   1rem;
  --radius-full: 9999px;
  --transition:  180ms cubic-bezier(0.16, 1, 0.3, 1);
  --transition-slow: 400ms cubic-bezier(0.16, 1, 0.3, 1);
  --shadow-sm:   0 1px 3px rgba(0,0,0,0.3);
  --shadow-md:   0 4px 16px rgba(0,0,0,0.4);
  --shadow-lg:   0 12px 40px rgba(0,0,0,0.55);
  --shadow-accent: 0 4px 24px rgba(232,100,10,0.25);
  --content-sm:  640px;
  --content-md:  960px;
  --content-lg:  1280px;
}

/* Light mode */
[data-theme="light"] {
  --color-bg:              #f4f2ee;
  --color-surface:         #faf9f7;
  --color-surface-2:       #ffffff;
  --color-surface-offset:  #edeae5;
  --color-surface-offset-2:#e5e2dc;
  --color-surface-dynamic: #dad7d0;
  --color-divider:         #d4d1ca;
  --color-border:          #c6c3bb;
  --color-text:            #1a1815;
  --color-text-muted:      #6b6760;
  --color-text-faint:      #b0ada7;
  --color-text-inverse:    #faf9f7;
  --color-accent:          #c8520a;
  --color-accent-hover:    #b04208;
  --color-accent-dark:     #943506;
  --color-accent-subtle:   rgba(200, 82, 10, 0.09);
  --color-accent-glow:     rgba(200, 82, 10, 0.18);
  --shadow-sm:  0 1px 3px rgba(0,0,0,0.07);
  --shadow-md:  0 4px 16px rgba(0,0,0,0.09);
  --shadow-lg:  0 12px 40px rgba(0,0,0,0.13);
}

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

html {
  -webkit-text-size-adjust: none;
  text-size-adjust: none;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  scroll-behavior: smooth;
  scroll-padding-top: 5rem;
}

body {
  min-height: 100dvh;
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: 1.65;
  color: var(--color-text);
  background: var(--color-bg);
  transition: background var(--transition-slow), color var(--transition-slow);
  overflow-x: hidden;
}

img, video, svg, canvas { display: block; max-width: 100%; height: auto; }
ul[role="list"], ol[role="list"] { list-style: none; }
input, button, textarea, select { font: inherit; color: inherit; }
button { cursor: pointer; background: none; border: none; }
a { color: inherit; text-decoration: none; }
address { font-style: normal; }
h1,h2,h3,h4,h5,h6 { text-wrap: balance; line-height: 1.1; }
p, li, figcaption { text-wrap: pretty; max-width: 72ch; }

::selection { background: var(--color-accent-subtle); color: var(--color-text); }
:focus-visible { outline: 2px solid var(--color-accent); outline-offset: 3px; border-radius: var(--radius-sm); }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

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

/* =============================================
   LAYOUT
   ============================================= */
.container {
  width: 100%;
  max-width: var(--content-lg);
  margin: 0 auto;
  padding-inline: clamp(var(--s5), 5vw, var(--s16));
}
.section {
  padding-block: clamp(var(--s16), 8vw, var(--s32));
}

/* =============================================
   TYPOGRAPHY HELPERS
   ============================================= */
.label {
  display: inline-block;
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: var(--s3);
}
.section-title {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--s4);
  letter-spacing: -0.02em;
}
.section-sub {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  line-height: 1.7;
  max-width: 60ch;
}
.section-header { margin-bottom: clamp(var(--s10), 5vw, var(--s16)); }

/* =============================================
   BUTTONS
   ============================================= */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--s2);
  font-family: var(--font-body);
  font-weight: 600;
  font-size: var(--text-sm);
  letter-spacing: 0.02em;
  border-radius: var(--radius-md);
  border: 2px solid transparent;
  padding: var(--s3) var(--s6);
  transition: all var(--transition);
  white-space: nowrap;
  cursor: pointer;
}
.btn-primary {
  background: var(--color-accent);
  color: #fff;
  border-color: var(--color-accent);
}
.btn-primary:hover {
  background: var(--color-accent-hover);
  border-color: var(--color-accent-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow-accent);
}
.btn-ghost {
  background: transparent;
  color: var(--color-text);
  border-color: var(--color-border);
}
.btn-ghost:hover { border-color: var(--color-accent); color: var(--color-accent); }
.btn-outline {
  background: transparent;
  color: var(--color-accent);
  border-color: var(--color-accent);
}
.btn-outline:hover { background: var(--color-accent); color: #fff; }
.btn-lg { padding: var(--s4) var(--s10); font-size: var(--text-base); }
.btn-sm { padding: var(--s2) var(--s4); font-size: var(--text-xs); }
.btn-full { width: 100%; justify-content: center; }

/* =============================================
   HEADER / NAV
   ============================================= */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  height: 4.5rem;
  display: flex;
  align-items: center;
  background: transparent;
  transition: background var(--transition-slow), box-shadow var(--transition-slow), transform 0.3s ease;
}
.site-header.scrolled {
  background: color-mix(in oklab, var(--color-bg) 88%, transparent);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  box-shadow: 0 1px 0 var(--color-divider);
}
.site-header.hidden { transform: translateY(-100%); }
.site-header .container { display: flex; align-items: center; justify-content: space-between; gap: var(--s6); }

/* Logo */
.site-logo { display: flex; align-items: center; gap: var(--s3); text-decoration: none; }
.site-logo__icon { width: 36px; height: 36px; flex-shrink: 0; color: #ffffff; }
[data-theme="light"] .site-header.scrolled .site-logo__icon { color: #1c1c1c; }
.site-logo__text { display: flex; flex-direction: column; line-height: 1.1; }
.site-logo__name { font-family: var(--font-display); font-size: 1.1rem; font-weight: 700; color: #ffffff; letter-spacing: -0.02em; }
[data-theme="light"] .site-header.scrolled .site-logo__name { color: var(--color-text); }
.site-logo__sub { font-size: 0.62rem; font-weight: 600; letter-spacing: 0.18em; text-transform: uppercase; color: var(--color-accent); }

/* Nav */
.site-nav { display: flex; align-items: center; gap: var(--s2); }
.site-nav__link {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  padding: var(--s2) var(--s3);
  border-radius: var(--radius-md);
  transition: color var(--transition), background var(--transition);
  position: relative;
}
.site-nav__link:hover, .site-nav__link.active { color: var(--color-text); background: var(--color-surface-dynamic); }
.site-nav__link.active::after {
  content: '';
  position: absolute;
  bottom: 4px; left: 50%;
  transform: translateX(-50%);
  width: 4px; height: 4px;
  border-radius: 50%;
  background: var(--color-accent);
}

.site-header__actions { display: flex; align-items: center; gap: var(--s3); }

.theme-toggle {
  width: 2.2rem; height: 2.2rem;
  display: flex; align-items: center; justify-content: center;
  border-radius: var(--radius-full);
  border: 1px solid var(--color-border);
  color: var(--color-text-muted);
  background: var(--color-surface);
  transition: all var(--transition);
}
.theme-toggle:hover { color: var(--color-accent); border-color: var(--color-accent); }

.mobile-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  width: 2.2rem; height: 2.2rem;
  align-items: center; justify-content: center;
  border-radius: var(--radius-md);
}
.mobile-toggle span {
  display: block; width: 22px; height: 2px;
  background: var(--color-text);
  border-radius: 1px;
  transition: all 0.3s ease;
}
.mobile-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.mobile-toggle.open span:nth-child(2) { opacity: 0; transform: scaleX(0); }
.mobile-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* Mobile menu overlay */
.mobile-menu {
  display: none;
  position: fixed;
  inset: 0;
  top: 4.5rem;
  background: var(--color-bg);
  z-index: 99;
  padding: var(--s8) clamp(var(--s5), 5vw, var(--s16));
  flex-direction: column;
  gap: var(--s2);
  border-top: 1px solid var(--color-divider);
}
.mobile-menu.open { display: flex; }
.mobile-menu a {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 600;
  color: var(--color-text);
  padding: var(--s4) 0;
  border-bottom: 1px solid var(--color-divider);
  transition: color var(--transition);
}
.mobile-menu a:hover { color: var(--color-accent); }

/* =============================================
   FOOTER
   ============================================= */
.site-footer {
  background: var(--color-surface);
  border-top: 1px solid var(--color-divider);
}
.site-footer__main {
  display: grid;
  grid-template-columns: 1.6fr repeat(3, 1fr);
  gap: clamp(var(--s8), 4vw, var(--s16));
  padding-block: clamp(var(--s12), 6vw, var(--s24));
}
.site-footer__brand p {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  margin-top: var(--s4);
  line-height: 1.7;
  max-width: 30ch;
}
.site-footer__social {
  display: flex; gap: var(--s3);
  margin-top: var(--s6);
}
.social-btn {
  width: 2.2rem; height: 2.2rem;
  border-radius: var(--radius-full);
  border: 1px solid var(--color-border);
  display: flex; align-items: center; justify-content: center;
  color: var(--color-text-muted);
  transition: all var(--transition);
}
.social-btn:hover { border-color: var(--color-accent); color: var(--color-accent); transform: translateY(-2px); }
.site-footer__col h4 {
  font-family: var(--font-display);
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text);
  margin-bottom: var(--s5);
}
.site-footer__col ul { display: flex; flex-direction: column; gap: var(--s3); list-style: none; }
.site-footer__col a { font-size: var(--text-sm); color: var(--color-text-muted); transition: color var(--transition); }
.site-footer__col a:hover { color: var(--color-accent); }
.site-footer__bottom {
  border-top: 1px solid var(--color-divider);
  padding-block: var(--s5);
  display: flex; align-items: center; justify-content: space-between;
  flex-wrap: wrap; gap: var(--s4);
}
.site-footer__bottom p { font-size: var(--text-xs); color: var(--color-text-faint); }
.site-footer__legal { display: flex; gap: var(--s6); }
.site-footer__legal a { font-size: var(--text-xs); color: var(--color-text-faint); transition: color var(--transition); }
.site-footer__legal a:hover { color: var(--color-text); }

/* =============================================
   BACK TO TOP
   ============================================= */
.back-to-top {
  position: fixed; bottom: var(--s8); right: var(--s8);
  width: 3rem; height: 3rem;
  border-radius: var(--radius-full);
  background: var(--color-accent); color: #fff;
  display: flex; align-items: center; justify-content: center;
  box-shadow: var(--shadow-lg);
  opacity: 0; transform: translateY(20px); pointer-events: none;
  transition: all var(--transition);
  z-index: 50;
}
.back-to-top.visible { opacity: 1; transform: translateY(0); pointer-events: auto; }
.back-to-top:hover { background: var(--color-accent-hover); transform: translateY(-3px); }

/* =============================================
   REVEAL ANIMATION
   ============================================= */
[data-reveal] {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.65s cubic-bezier(0.16,1,0.3,1), transform 0.65s cubic-bezier(0.16,1,0.3,1);
}
[data-reveal].revealed { opacity: 1; transform: translateY(0); }

/* =============================================
   TOAST
   ============================================= */
.toast {
  position: fixed; bottom: var(--s8); left: 50%;
  transform: translateX(-50%) translateY(80px);
  background: var(--color-surface-2);
  color: var(--color-text);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--s4) var(--s8);
  font-size: var(--text-sm); font-weight: 500;
  box-shadow: var(--shadow-lg);
  z-index: 200; opacity: 0; pointer-events: none;
  transition: all 0.4s cubic-bezier(0.16,1,0.3,1);
  white-space: nowrap;
}
.toast.visible { opacity: 1; transform: translateX(-50%) translateY(0); }

/* =============================================
   PAGE HERO (inner pages)
   ============================================= */
.page-hero {
  position: relative;
  padding-block: clamp(var(--s20), 10vw, var(--s32));
  padding-top: calc(clamp(var(--s20), 10vw, var(--s32)) + 4.5rem);
  background: var(--color-surface);
  overflow: hidden;
}
.page-hero__bg {
  position: absolute; inset: 0;
  background-image: linear-gradient(135deg, var(--color-accent-subtle) 0%, transparent 50%);
  pointer-events: none;
}
.page-hero__bg::after {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--color-border) 1px, transparent 1px),
    linear-gradient(90deg, var(--color-border) 1px, transparent 1px);
  background-size: 48px 48px;
  opacity: 0.2;
  mask-image: radial-gradient(ellipse at 30% 60%, black 20%, transparent 70%);
}
.page-hero__content { position: relative; z-index: 1; }
.page-hero__label { display: block; margin-bottom: var(--s3); }
.page-hero__title {
  font-family: var(--font-display);
  font-size: var(--text-3xl);
  font-weight: 700;
  letter-spacing: -0.03em;
  margin-bottom: var(--s4);
}
.page-hero__sub {
  font-size: var(--text-lg);
  color: var(--color-text-muted);
  line-height: 1.6;
  max-width: 55ch;
}

/* =============================================
   IMAGE UTILITIES
   ============================================= */
.img-cover {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}
.img-rounded { border-radius: var(--radius-xl); overflow: hidden; }

/* =============================================
   RESPONSIVE
   ============================================= */
@media (max-width: 1024px) {
  .site-nav, .site-header__actions .btn { display: none; }
  .mobile-toggle { display: flex; }
  .site-footer__main { grid-template-columns: 1fr 1fr; }
  .site-footer__brand { grid-column: 1 / -1; }
}
@media (max-width: 640px) {
  .site-footer__main { grid-template-columns: 1fr; }
}