/* ============================================================
   Design Lab — learndesign.tech
   Theme tokens
   ============================================================ */
:root {
  --bg:        #faf4ea;
  --surface:   #fffdf8;
  --surface-2: #f3e9d8;
  --ink:       #2a2018;
  --ink-soft:  #6e5e50;
  --ink-faint: #a3917f;
  --line:      #ece0cd;
  --accent:    #e8623c;
  --accent-2:  #e0962f;
  --accent-soft: #fdeee4;
  --radius:    18px;
  --radius-sm: 12px;
  --shadow:    0 1px 2px rgba(74,52,32,.05), 0 12px 32px -12px rgba(74,52,32,.18);
  --shadow-lg: 0 24px 60px -20px rgba(74,52,32,.32);
  --maxw:      1120px;
  --font-display: "Space Grotesk", system-ui, sans-serif;
  --font-body: "Inter", system-ui, -apple-system, sans-serif;
}

[data-theme="dark"] {
  --bg:        #17120e;
  --surface:   #201a15;
  --surface-2: #29211b;
  --ink:       #f6ede1;
  --ink-soft:  #c8b6a4;
  --ink-faint: #8f7d6c;
  --line:      #342a22;
  --accent:    #f2774d;
  --accent-2:  #eda849;
  --accent-soft: #2e1f16;
  --shadow:    0 1px 2px rgba(0,0,0,.3), 0 12px 32px -12px rgba(0,0,0,.6);
  --shadow-lg: 0 24px 60px -20px rgba(0,0,0,.7);
}

/* ============================================================
   Base
   ============================================================ */
* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; scroll-padding-top: 88px; }

body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--ink);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  transition: background .3s ease, color .3s ease;
}

.container { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }

h1, h2, h3 { font-family: var(--font-display); font-weight: 700; line-height: 1.1; letter-spacing: -.02em; }

a { color: inherit; text-decoration: none; }

.grad {
  background: linear-gradient(100deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}

/* ============================================================
   Buttons
   ============================================================ */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  gap: .5rem; padding: .72rem 1.4rem; border-radius: 999px;
  font-family: var(--font-display); font-weight: 600; font-size: .95rem;
  cursor: pointer; border: 1px solid transparent; transition: transform .15s ease, box-shadow .2s ease, background .2s ease, border-color .2s ease;
}
.btn:active { transform: translateY(1px); }
.btn--primary { background: var(--accent); color: #fff; box-shadow: 0 8px 20px -8px var(--accent); }
.btn--primary:hover { transform: translateY(-2px); box-shadow: 0 14px 28px -10px var(--accent); }
.btn--ghost { background: transparent; color: var(--ink); border-color: var(--line); }
.btn--ghost:hover { background: var(--surface-2); border-color: var(--ink-faint); }

/* ============================================================
   Nav
   ============================================================ */
.nav {
  position: sticky; top: 0; z-index: 50;
  backdrop-filter: saturate(180%) blur(14px);
  background: color-mix(in srgb, var(--bg) 80%, transparent);
  border-bottom: 1px solid transparent;
  transition: border-color .3s ease, background .3s ease;
}
.nav.is-scrolled { border-color: var(--line); }
.nav__inner { display: flex; align-items: center; justify-content: space-between; height: 68px; }

.brand { display: inline-flex; align-items: center; gap: .55rem; font-family: var(--font-display); font-weight: 700; font-size: 1.18rem; }
.brand__mark {
  display: grid; place-items: center; width: 32px; height: 32px;
  background: var(--ink); color: var(--bg); border-radius: 9px; font-size: 1rem;
}
.brand__dot { color: var(--accent); }

.nav__links { display: flex; gap: 1.8rem; }
.nav__links a { font-size: .95rem; color: var(--ink-soft); font-weight: 500; transition: color .2s; }
.nav__links a:hover { color: var(--ink); }

.nav__actions { display: flex; align-items: center; gap: .8rem; }

.theme-toggle {
  display: grid; place-items: center; width: 38px; height: 38px;
  border-radius: 10px; border: 1px solid var(--line); background: var(--surface);
  color: var(--ink); cursor: pointer; transition: background .2s, border-color .2s;
}
.theme-toggle:hover { background: var(--surface-2); }
.theme-toggle .icon-moon { display: none; }
[data-theme="dark"] .theme-toggle .icon-sun { display: none; }
[data-theme="dark"] .theme-toggle .icon-moon { display: block; }

/* ============================================================
   Hero
   ============================================================ */
.hero { position: relative; overflow: hidden; padding: clamp(60px, 12vw, 140px) 0 clamp(50px, 8vw, 90px); }
.hero__bg {
  position: absolute; inset: -20% -10% auto -10%; height: 120%;
  background:
    radial-gradient(45% 55% at 16% 18%, rgba(232,98,60,.26), transparent 70%),
    radial-gradient(40% 50% at 88% 12%, rgba(224,150,47,.24), transparent 70%),
    radial-gradient(50% 60% at 60% 90%, rgba(232,98,60,.10), transparent 70%);
  filter: blur(4px); z-index: 0;
}
.hero__bg::after {
  content: ""; position: absolute; inset: 0;
  background-image: linear-gradient(var(--line) 1px, transparent 1px), linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 48px 48px; opacity: .35;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 30%, #000 30%, transparent 75%);
}
.hero__inner { position: relative; z-index: 1; max-width: 760px; }

.eyebrow {
  display: inline-block; font-family: var(--font-display); font-weight: 600;
  font-size: .82rem; letter-spacing: .04em; text-transform: uppercase;
  color: var(--accent); background: var(--accent-soft);
  padding: .4rem .85rem; border-radius: 999px; margin-bottom: 1.4rem;
}
.hero__title { font-size: clamp(2.6rem, 7vw, 4.6rem); margin-bottom: 1.3rem; }
.hero__lede { font-size: clamp(1.05rem, 2.2vw, 1.3rem); color: var(--ink-soft); max-width: 600px; margin-bottom: 2rem; }
.hero__cta { display: flex; flex-wrap: wrap; gap: .9rem; margin-bottom: 3rem; }

.hero__stats { display: flex; gap: 2.6rem; flex-wrap: wrap; }
.hero__stats div { display: flex; flex-direction: column; }
.hero__stats strong { font-family: var(--font-display); font-size: 1.6rem; line-height: 1; }
.hero__stats span { font-size: .85rem; color: var(--ink-faint); margin-top: .25rem; }

/* ============================================================
   Sections
   ============================================================ */
.section { padding: clamp(56px, 9vw, 110px) 0; }
.section--alt { background: var(--surface-2); }
.section__head { max-width: 640px; margin-bottom: 3rem; }
.section__head h2 { font-size: clamp(1.9rem, 4vw, 2.8rem); margin-bottom: .8rem; }
.section__head p { color: var(--ink-soft); font-size: 1.08rem; }

/* ============================================================
   Topics
   ============================================================ */
.topics { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.1rem; }
.topic {
  position: relative; background: var(--surface); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 1.6rem; transition: transform .2s ease, box-shadow .25s ease, border-color .2s;
  display: flex; flex-direction: column; min-height: 188px;
}
.topic:hover { transform: translateY(-4px); box-shadow: var(--shadow); border-color: transparent; }
.topic__icon { font-size: 1.7rem; margin-bottom: .9rem; }
.topic h3 { font-size: 1.22rem; margin-bottom: .45rem; }
.topic p { color: var(--ink-soft); font-size: .95rem; flex: 1; }
.topic__arrow { color: var(--accent); font-size: 1.2rem; margin-top: 1rem; transition: transform .2s; align-self: flex-start; }
.topic:hover .topic__arrow { transform: translateX(5px); }
.topic--cta { background: var(--ink); color: var(--bg); border-color: var(--ink); }
.topic--cta p { color: color-mix(in srgb, var(--bg) 75%, transparent); }
.topic--cta .topic__icon { color: var(--accent); }

/* ============================================================
   Filters
   ============================================================ */
.filters { display: flex; flex-wrap: wrap; gap: .6rem; margin-bottom: 2.4rem; }
.chip {
  font-family: var(--font-display); font-weight: 500; font-size: .9rem;
  padding: .5rem 1.1rem; border-radius: 999px; cursor: pointer;
  background: var(--surface); border: 1px solid var(--line); color: var(--ink-soft);
  transition: all .18s ease;
}
.chip:hover { color: var(--ink); border-color: var(--ink-faint); }
.chip.is-active { background: var(--ink); color: var(--bg); border-color: var(--ink); }

/* ============================================================
   Lesson grid
   ============================================================ */
.grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.4rem; }
.card {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius);
  overflow: hidden; transition: transform .2s ease, box-shadow .25s ease, border-color .2s;
  display: flex; flex-direction: column;
}
.card:hover { transform: translateY(-4px); box-shadow: var(--shadow); border-color: transparent; }
.card.is-hidden { display: none; }

.card__media {
  position: relative; width: 100%; aspect-ratio: 16/9; border: none; padding: 0;
  cursor: pointer; background: var(--surface-2); overflow: hidden; display: block;
}
.card__media img { width: 100%; height: 100%; object-fit: cover; transition: transform .4s ease; display: block; }
.card:hover .card__media img { transform: scale(1.05); }
.card__play {
  position: absolute; inset: 0; margin: auto; width: 56px; height: 56px;
  display: grid; place-items: center; border-radius: 50%;
  background: rgba(20,23,26,.55); color: #fff; font-size: 1.1rem; padding-left: 4px;
  backdrop-filter: blur(2px); transition: transform .2s, background .2s;
}
.card__media:hover .card__play { transform: scale(1.1); background: var(--accent); }

.card__body { padding: 1.3rem; display: flex; flex-direction: column; flex: 1; }
.card__body h3 { font-size: 1.15rem; margin: .6rem 0 .45rem; }
.card__body p { color: var(--ink-soft); font-size: .93rem; flex: 1; }
.card__meta { color: var(--ink-faint); font-size: .82rem; margin-top: 1rem; }

.tag {
  align-self: flex-start; font-family: var(--font-display); font-weight: 600;
  font-size: .72rem; letter-spacing: .03em; text-transform: uppercase;
  padding: .28rem .7rem; border-radius: 999px; background: var(--surface-2); color: var(--ink-soft);
}
.tag--3d      { background: #fbecc9; color: #a9781a; }
.tag--fusion  { background: #fde4d9; color: #cf5530; }
.tag--laser   { background: #fadfd6; color: #bf402a; }
.tag--projects{ background: #edefd2; color: #6c7a2c; }
.tag--howto   { background: #f5e1da; color: #a85f3e; }
[data-theme="dark"] .tag--3d      { background: #2e2410; color: #e0ac4d; }
[data-theme="dark"] .tag--fusion  { background: #2e1d14; color: #f2885f; }
[data-theme="dark"] .tag--laser   { background: #2f1a13; color: #f17a5d; }
[data-theme="dark"] .tag--projects{ background: #232711; color: #b6c45c; }
[data-theme="dark"] .tag--howto   { background: #2d1e15; color: #e09a6f; }

.grid__empty { text-align: center; color: var(--ink-faint); padding: 3rem 0; font-size: 1.05rem; }

/* ============================================================
   About
   ============================================================ */
.about { display: grid; grid-template-columns: 1.3fr 1fr; gap: 3rem; align-items: center; }
.about__text h2 { font-size: clamp(1.9rem, 4vw, 2.8rem); margin-bottom: 1.2rem; }
.about__text p { color: var(--ink-soft); font-size: 1.08rem; margin-bottom: 1rem; }
.about__cta { display: flex; flex-wrap: wrap; gap: .9rem; margin-top: 1.6rem; }

.about__card {
  background: linear-gradient(150deg, #2a2018, #4a382a); border-radius: var(--radius);
  padding: 2.5rem; box-shadow: var(--shadow-lg); aspect-ratio: 4/3; display: flex;
  flex-direction: column; justify-content: space-between; position: relative; overflow: hidden;
}
.about__card::before {
  content: ""; position: absolute; top: -40%; right: -20%; width: 70%; height: 90%;
  background: radial-gradient(circle, rgba(255,106,61,.5), transparent 70%); filter: blur(10px);
}
.about__badge {
  width: 64px; height: 64px; border-radius: 16px; background: var(--accent); color: #fff;
  display: grid; place-items: center; font-family: var(--font-display); font-weight: 700;
  font-size: 1.5rem; position: relative; z-index: 1;
}
.about__lines { display: flex; flex-direction: column; gap: .7rem; position: relative; z-index: 1; }
.about__lines span { height: 10px; border-radius: 6px; background: rgba(255,255,255,.18); }
.about__lines span:nth-child(1) { width: 80%; }
.about__lines span:nth-child(2) { width: 60%; }
.about__lines span:nth-child(3) { width: 70%; }

/* ============================================================
   Footer
   ============================================================ */
.footer { background: var(--surface-2); border-top: 1px solid var(--line); padding: 3rem 0; }
.footer__inner { display: flex; flex-direction: column; align-items: center; gap: 1rem; text-align: center; }
.footer__tag { color: var(--ink-soft); }
.footer__links { display: flex; gap: 1.6rem; flex-wrap: wrap; justify-content: center; }
.footer__links a { color: var(--ink-soft); font-size: .95rem; transition: color .2s; }
.footer__links a:hover { color: var(--accent); }
.footer__copy { color: var(--ink-faint); font-size: .85rem; }

/* ============================================================
   Lightbox
   ============================================================ */
.lightbox { position: fixed; inset: 0; z-index: 100; display: grid; place-items: center; padding: 24px; }
.lightbox[hidden] { display: none; }
.lightbox__backdrop { position: absolute; inset: 0; background: rgba(8,10,12,.8); backdrop-filter: blur(6px); animation: fade .25s ease; }
.lightbox__frame { position: relative; width: min(960px, 100%); animation: pop .3s cubic-bezier(.2,.9,.3,1.2); }
.lightbox__video { position: relative; aspect-ratio: 16/9; border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow-lg); background: #000; }
.lightbox__video iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; }
.lightbox__close {
  position: absolute; top: -48px; right: 0; width: 38px; height: 38px; border-radius: 50%;
  background: rgba(255,255,255,.12); color: #fff; border: none; cursor: pointer; font-size: 1rem;
  transition: background .2s;
}
.lightbox__close:hover { background: var(--accent); }

@keyframes fade { from { opacity: 0; } }
@keyframes pop { from { opacity: 0; transform: scale(.95) translateY(10px); } }

/* ============================================================
   Reveal on scroll
   ============================================================ */
.reveal { opacity: 0; transform: translateY(22px); transition: opacity .6s ease, transform .6s ease; }
.reveal.is-in { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
}

/* ============================================================
   Responsive
   ============================================================ */
@media (max-width: 860px) {
  .topics { grid-template-columns: repeat(2, 1fr); }
  .grid { grid-template-columns: repeat(2, 1fr); }
  .about { grid-template-columns: 1fr; }
  .about__card { display: none; }
  .nav__links { display: none; }
}
@media (max-width: 560px) {
  .topics, .grid { grid-template-columns: 1fr; }
  .hero__stats { gap: 1.6rem; }
  .nav__actions .btn { display: none; }
}