/* =================================================================
   Motion Studio KZ — Premium design system
   Foundations: Apple-inspired modern. WCAG 2.2 AA. Inter.
   Type scale: 12/14/16/18/24/30/36 (+ display tokens)
   Spacing scale: 4/8/12/16/24/32 (+ 48/64/96 layout tokens)
   ================================================================= */

:root {
  /* --- surfaces --- */
  --surface:         #ffffff;
  --surface-2:       #fafaf9;
  --surface-3:       #f5f5f4;

  /* --- ink / neutrals --- */
  --ink:             #111827;
  --ink-soft:        #1f2937;
  --neutral-500:     #6b7280;
  --neutral-400:     #9ca3af;
  --neutral-300:     #d1d5db;
  --neutral-200:     #e5e7eb;
  --neutral-100:     #f3f4f6;
  --hairline:        rgba(17, 24, 39, 0.08);

  /* --- accents (premium monochrome w/ one blue) --- */
  --primary:         #111827;
  --primary-hover:   #000000;
  --link:            #3b82f6;

  /* --- type scale --- */
  --t-xs:  12px;
  --t-sm:  14px;
  --t-md:  16px;
  --t-lg:  18px;
  --t-xl:  24px;
  --t-2xl: 30px;
  --t-3xl: 36px;

  /* --- display (fluid, scroll-scale) --- */
  --display-hero:   clamp(44px, 9vw, 120px);
  --display-cta:    clamp(28px, 3.6vw, 52px);

  /* --- spacing scale --- */
  --s-1:  4px;
  --s-2:  8px;
  --s-3:  12px;
  --s-4:  16px;
  --s-5:  24px;
  --s-6:  32px;
  --s-7:  48px;
  --s-8:  64px;
  --s-9:  96px;
  --s-10: 128px;

  /* --- radii --- */
  --r-sm:  6px;
  --r-md:  10px;
  --r-lg:  14px;
  --r-xl:  20px;
  --r-pill: 9999px;

  /* --- elevation (premium: soft, almost-no shadow) --- */
  --elev-1: 0 1px 2px rgba(17, 24, 39, 0.04);
  --elev-2: 0 2px 8px rgba(17, 24, 39, 0.06), 0 1px 2px rgba(17, 24, 39, 0.04);
  --elev-3: 0 12px 28px rgba(17, 24, 39, 0.10), 0 2px 6px rgba(17, 24, 39, 0.05);

  /* --- motion --- */
  --ease-out:  cubic-bezier(0.22, 1, 0.36, 1);
  --ease-in-out: cubic-bezier(0.65, 0, 0.35, 1);
  --dur-fast:  150ms;
  --dur-base:  280ms;
  --dur-slow:  640ms;

  /* --- layout --- */
  --container: 1280px;
  --nav-h:    64px;
}

/* =================================================================
   Reset / base
   ================================================================= */
*, *::before, *::after { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--surface);
  color: var(--ink);
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'SF Pro Text',
    'Helvetica Neue', Arial, sans-serif;
  font-size: var(--t-md);
  line-height: 1.55;
  font-feature-settings: 'ss01', 'cv11';
  letter-spacing: -0.01em;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

img, svg, video { display: block; max-width: 100%; }
ul { list-style: none; margin: 0; padding: 0; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }

.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--s-7);
  width: 100%;
}

/* =================================================================
   Accessibility — visible keyboard focus (WCAG 2.2 AA)
   ================================================================= */
:focus { outline: none; }
:focus-visible {
  outline: 2px solid var(--ink);
  outline-offset: 3px;
  border-radius: var(--r-sm);
}
.btn:focus-visible { outline-offset: 4px; border-radius: var(--r-pill); }
.card:focus-visible { outline-offset: 6px; border-radius: var(--r-xl); }

/* =================================================================
   Atoms
   ================================================================= */
.arrow { width: 18px; height: 18px; flex-shrink: 0; }

.dot {
  display: inline-block;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--ink);
  flex-shrink: 0;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--s-3);
  font-size: var(--t-xs);
  line-height: 1;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--ink);
  font-weight: 500;
}

/* =================================================================
   Buttons — Premium
   States: default / hover / focus-visible / active / disabled
   ================================================================= */
.btn {
  --btn-bg: var(--ink);
  --btn-fg: var(--surface);
  --btn-border: var(--ink);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--s-3);
  padding: 14px var(--s-6);
  font-size: var(--t-sm);
  font-weight: 500;
  line-height: 1;
  letter-spacing: -0.005em;
  background: var(--btn-bg);
  color: var(--btn-fg);
  border: 1px solid var(--btn-border);
  border-radius: var(--r-pill);
  white-space: nowrap;
  transition:
    transform var(--dur-fast) var(--ease-out),
    background var(--dur-base) var(--ease-out),
    color var(--dur-base) var(--ease-out),
    border-color var(--dur-base) var(--ease-out),
    box-shadow var(--dur-base) var(--ease-out);
}
.btn .arrow { transition: transform var(--dur-base) var(--ease-out); }
.btn:hover .arrow { transform: translate(2px, -2px); }
.btn:active { transform: translateY(1px); }
.btn[disabled],
.btn[aria-disabled="true"] {
  opacity: 0.5;
  pointer-events: none;
}

.btn-primary {
  --btn-bg: var(--ink);
  --btn-fg: var(--surface);
  --btn-border: var(--ink);
  box-shadow: var(--elev-2);
}
.btn-primary:hover {
  --btn-bg: var(--primary-hover);
  box-shadow: var(--elev-3);
}

.btn-ghost {
  --btn-bg: transparent;
  --btn-fg: var(--ink);
  --btn-border: transparent;
  padding: 10px var(--s-4);
}
.btn-ghost:hover {
  --btn-bg: var(--neutral-100);
}

.btn-outline {
  --btn-bg: transparent;
  --btn-fg: var(--ink);
  --btn-border: var(--ink);
}
.btn-outline:hover {
  --btn-bg: var(--ink);
  --btn-fg: var(--surface);
}

/* =================================================================
   Navigation — sticky translucent (Apple-style)
   ================================================================= */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--nav-h);
  background: rgba(255, 255, 255, 0);
  border-bottom: 1px solid transparent;
  backdrop-filter: saturate(180%) blur(0px);
  -webkit-backdrop-filter: saturate(180%) blur(0px);
  transition:
    background var(--dur-base) var(--ease-out),
    border-color var(--dur-base) var(--ease-out),
    backdrop-filter var(--dur-base) var(--ease-out);
}
.nav.is-scrolled {
  background: rgba(255, 255, 255, 0.72);
  border-bottom-color: var(--hairline);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
}

.nav-inner {
  max-width: var(--container);
  margin: 0 auto;
  height: 100%;
  padding: 0 var(--s-7);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--s-5);
}

.nav-brand {
  display: inline-flex;
  align-items: center;
  border-radius: var(--r-md);
  transition: opacity var(--dur-fast) var(--ease-out);
}
.nav-brand:hover { opacity: 0.75; }

.nav-logo {
  display: block;
  height: 28px;
  width: auto;
  object-fit: contain;
}
@media (max-width: 640px) {
  .nav-logo { height: 24px; }
}

.nav-cta { font-size: var(--t-sm); }

/* =================================================================
   Hero
   ================================================================= */
.hero {
  position: relative;
  min-height: 100vh;
  min-height: 100svh;
  display: flex;
  flex-direction: column;
  padding: calc(var(--nav-h) + var(--s-5)) var(--s-7) var(--s-5);
  overflow: hidden;
  isolation: isolate;
  background: var(--surface);
}

.hero-bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 62%;
  z-index: -1;
  pointer-events: none;
}

.hero-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding-bottom: 28vh;
}

.hero-title {
  margin: 0;
  font-size: var(--display-hero);
  line-height: 0.95;
  letter-spacing: -0.04em;
  font-weight: 500;
  display: inline-flex;
  align-items: baseline;
  gap: 0.22em;
  white-space: nowrap;
}

.hero-title-word {
  display: inline-block;
  opacity: 0;
  transform: translateY(18px);
  animation: riseIn 900ms var(--ease-out) forwards;
}
.hero-title-word:nth-child(2) { animation-delay: 80ms; }

.hero-title-tld {
  font-size: 0.22em;
  font-weight: 400;
  letter-spacing: 0.02em;
  color: var(--neutral-500);
  align-self: flex-start;
  padding-top: 0.1em;
  opacity: 0;
  animation: fadeIn 900ms 280ms var(--ease-out) forwards;
}

.hero-sub {
  margin: var(--s-5) 0 var(--s-5);
  font-size: clamp(var(--t-sm), 1.3vw, var(--t-lg));
  color: var(--neutral-500);
  max-width: 44ch;
  opacity: 0;
  animation: riseIn 900ms 180ms var(--ease-out) forwards;
}

.hero-content .btn {
  opacity: 0;
  animation: riseIn 900ms 360ms var(--ease-out) forwards;
}

.scroll-hint {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--s-2);
  color: var(--neutral-500);
  font-size: var(--t-xs);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  opacity: 0;
  animation: fadeIn 900ms 560ms var(--ease-out) forwards;
}
.scroll-hint svg {
  width: 16px;
  height: 16px;
  animation: bob 2.4s var(--ease-in-out) infinite;
}

@keyframes riseIn {
  from { opacity: 0; transform: translateY(18px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes fadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}
@keyframes bob {
  0%, 100% { transform: translateY(0); }
  50%      { transform: translateY(4px); }
}

/* =================================================================
   About
   ================================================================= */
.about {
  padding: var(--s-10) 0 var(--s-7);
  background: var(--surface);
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--s-7);
  align-items: start;
}

.about-copy {
  display: flex;
  flex-direction: column;
  gap: var(--s-6);
}

.about-side {
  position: relative;
  border-radius: var(--r-xl);
  overflow: hidden;
}

.about-video {
  width: 100%;
  height: auto;
  display: block;
}

.about-text {
  margin: 0;
  font-size: clamp(var(--t-lg), 1.6vw, var(--t-xl));
  line-height: 1.7;
  letter-spacing: -0.018em;
  max-width: 52ch;
}

/* =================================================================
   Projects
   ================================================================= */
.projects {
  padding: var(--s-7) 0 var(--s-10);
}

.projects-head {
  border-top: 1px solid var(--hairline);
  padding: var(--s-6) 0 var(--s-6);
  margin-bottom: var(--s-5);
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--s-5);
}

.card {
  display: flex;
  flex-direction: column;
  gap: var(--s-4);
  text-align: left;
  isolation: isolate;
  transition: transform var(--dur-base) var(--ease-out);
}
.card:hover { transform: translateY(-4px); }

.card-media-frame {
  position: relative;
  aspect-ratio: 16 / 9;
  border-radius: var(--r-xl);
  overflow: hidden;
  background: var(--surface-3);
  box-shadow: var(--elev-1);
  transition:
    box-shadow var(--dur-base) var(--ease-out),
    transform var(--dur-base) var(--ease-out);
}
.card:hover .card-media-frame {
  box-shadow: var(--elev-3);
}

.card-media {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 700ms var(--ease-out);
}
.card:hover .card-media { transform: scale(1.03); }

.card-body { padding: 0 var(--s-1); }

.card-title {
  margin: 0 0 var(--s-1);
  font-size: var(--t-md);
  font-weight: 500;
  letter-spacing: -0.012em;
  color: var(--ink);
}

.card-lead {
  margin: 0 0 var(--s-2);
  font-size: var(--t-sm);
  color: var(--ink-soft);
}

.card-desc {
  margin: 0 0 var(--s-4);
  font-size: var(--t-xs);
  line-height: 1.55;
  color: var(--neutral-500);
}

.card-tag {
  display: block;
  padding-top: var(--s-3);
  border-top: 1px solid var(--hairline);
  font-size: var(--t-xs);
  color: var(--neutral-500);
  letter-spacing: 0.02em;
}

/* =================================================================
   CTA
   ================================================================= */
.cta {
  padding: var(--s-8) 0 var(--s-8);
  background: var(--surface);
  text-align: center;
}

.cta-box {
  position: relative;
  overflow: hidden;
  isolation: isolate;
  border-radius: 28px;
  padding: var(--s-9) var(--s-7);
  box-shadow: var(--elev-2);
}

.cta-bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center center;
  z-index: -1;
  pointer-events: none;
}

.cta-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.cta-title {
  margin: 0 auto var(--s-7);
  font-size: var(--display-cta);
  line-height: 1.1;
  letter-spacing: -0.028em;
  font-weight: 500;
  max-width: 18ch;
  color: var(--ink);
}

/* =================================================================
   Footer — single-line
   ================================================================= */
.footer {
  border-top: 1px solid var(--hairline);
  background: var(--surface);
}

.footer-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--s-5);
  padding-top: var(--s-8);
  padding-bottom: var(--s-8);
  font-size: var(--t-sm);
  color: var(--neutral-500);
}

.f-copy { letter-spacing: -0.005em; }

.f-links {
  display: flex;
  align-items: center;
  gap: var(--s-6);
}

.f-link {
  display: inline-flex;
  align-items: center;
  gap: var(--s-2);
  color: var(--ink);
  transition: opacity var(--dur-fast) var(--ease-out);
}
.f-link:hover,
.f-link:focus-visible { opacity: 0.6; }

.f-icon {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
}

/* =================================================================
   Scroll reveal
   ================================================================= */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition:
    opacity var(--dur-slow) var(--ease-out),
    transform var(--dur-slow) var(--ease-out);
  will-change: opacity, transform;
}
.reveal.is-visible { opacity: 1; transform: translateY(0); }

.reveal-stagger > * {
  opacity: 0;
  transform: translateY(22px);
  transition:
    opacity var(--dur-slow) var(--ease-out),
    transform var(--dur-slow) var(--ease-out);
}
.reveal-stagger.is-visible > * { opacity: 1; transform: translateY(0); }
.reveal-stagger.is-visible > *:nth-child(1) { transition-delay: 40ms; }
.reveal-stagger.is-visible > *:nth-child(2) { transition-delay: 150ms; }
.reveal-stagger.is-visible > *:nth-child(3) { transition-delay: 260ms; }
.reveal-stagger.is-visible > *:nth-child(4) { transition-delay: 370ms; }

.slide-over {
  position: relative;
  z-index: 2;
  background: var(--surface);
  transform: translateY(40px);
  opacity: 0;
  transition:
    opacity 900ms var(--ease-out),
    transform 900ms var(--ease-out);
  will-change: opacity, transform;
}
.slide-over.is-visible { transform: translateY(0); opacity: 1; }

/* =================================================================
   Reduced motion
   ================================================================= */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  .reveal, .reveal-stagger > *, .slide-over,
  .hero-title-word, .hero-title-tld, .hero-sub, .hero-content .btn,
  .scroll-hint {
    opacity: 1 !important;
    transform: none !important;
  }
}

/* =================================================================
   Responsive — mobile-first refinements
   ================================================================= */
@media (max-width: 1100px) {
  :root { --s-9: 72px; --s-10: 96px; }
  .footer-grid { gap: var(--s-6); }
}

@media (max-width: 960px) {
  :root { --nav-h: 56px; }
  .container,
  .nav-inner { padding-left: var(--s-5); padding-right: var(--s-5); }
  .hero { padding-left: var(--s-5); padding-right: var(--s-5); }

  .about { padding: var(--s-9) 0 var(--s-6); }
  .about-grid { grid-template-columns: 1fr; gap: var(--s-6); }

  .projects { padding: var(--s-6) 0 var(--s-9); }
  .projects-grid { grid-template-columns: repeat(2, 1fr); gap: var(--s-5); }

  .cta { padding: var(--s-7) 0 var(--s-7); }
  .cta-box { padding: var(--s-8) var(--s-5); border-radius: 24px; }

  .hero-content { padding-bottom: 20vh; }
}

@media (max-width: 640px) {
  .container,
  .nav-inner { padding-left: var(--s-4); padding-right: var(--s-4); }
  .hero { padding-left: var(--s-4); padding-right: var(--s-4); }

  .hero-title {
    white-space: normal;
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.12em 0.22em;
    font-size: clamp(42px, 14vw, 72px);
    letter-spacing: -0.03em;
  }
  .hero-title-tld { font-size: 0.3em; padding-top: 0.2em; }
  .hero-sub { font-size: var(--t-sm); max-width: 34ch; margin: var(--s-4) auto var(--s-5); }
  .hero-content { padding-bottom: 14vh; }

  .about { padding: var(--s-8) 0 var(--s-5); }
  .about-text { font-size: var(--t-lg); }

  .projects { padding: var(--s-5) 0 var(--s-8); }
  .projects-head { padding: var(--s-5) 0; }
  .projects-grid { grid-template-columns: 1fr; gap: var(--s-6); }

  .cta { padding: var(--s-6) 0 var(--s-6); }
  .cta-box { padding: var(--s-7) var(--s-4); border-radius: 20px; }
  .cta-title { font-size: clamp(24px, 6.8vw, 34px); margin-bottom: var(--s-6); }

  .footer-row {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--s-4);
    padding-top: var(--s-6);
    padding-bottom: var(--s-6);
    font-size: var(--t-xs);
  }
  .f-links { gap: var(--s-5); }

  .btn { padding: 12px var(--s-5); }
}

@media (max-width: 420px) {
  .hero-title { font-size: clamp(36px, 15vw, 60px); }
  .cta-title { font-size: 22px; }
}