/* =========================================================================
   Massa Baali — Academic portfolio
   Design system. Signature motif: spectrogram / waveform (speech & audio).
   Palette: deep ink navy ground, warm spectrogram coral→amber accent.
   Type:   Fraunces (display serif) · Inter (body grotesque) · JetBrains Mono (data)
   ========================================================================= */

:root {
  /* ---- Light theme ---- */
  --bg:            #faf8f4;   /* warm paper */
  --bg-raised:     #ffffff;
  --bg-sunken:     #f1ede4;
  --ink:           #16181d;   /* near-black ink */
  --ink-soft:      #41454e;
  --ink-faint:     #6b7280;
  --line:          #e3ddd0;
  --line-strong:   #cdc6b6;

  /* spectrogram accent ramp (cool low → hot high) */
  --accent:        #e0533d;   /* coral — primary */
  --accent-deep:   #c23a2b;
  --accent-warm:   #f0a23c;   /* amber */
  --accent-cool:   #2e6f95;   /* the cold end of the map */
  --accent-tint:   #fbe9e4;

  --ok:            #2f7d5b;

  --radius:        14px;
  --radius-sm:     9px;
  --radius-lg:     22px;
  --shadow-sm:     0 1px 2px rgba(20,24,29,.05), 0 2px 6px rgba(20,24,29,.04);
  --shadow:        0 4px 14px rgba(20,24,29,.07), 0 14px 38px rgba(20,24,29,.07);
  --shadow-lg:     0 12px 40px rgba(20,24,29,.13);

  --maxw:          1120px;
  --ease:          cubic-bezier(.22,.61,.36,1);

  --ff-display: "Fraunces", Georgia, "Times New Roman", serif;
  --ff-body:    "Inter", system-ui, -apple-system, "Segoe UI", sans-serif;
  --ff-mono:    "JetBrains Mono", ui-monospace, "SF Mono", Menlo, monospace;

  --header-h: 66px;
}

html[data-theme="dark"] {
  --bg:            #0e1014;
  --bg-raised:     #16191f;
  --bg-sunken:     #0a0c0f;
  --ink:           #f3f1ec;
  --ink-soft:      #c4c8d0;
  --ink-faint:     #8b919c;
  --line:          #262a32;
  --line-strong:   #363c46;
  --accent:        #f2705a;
  --accent-deep:   #e0533d;
  --accent-warm:   #f6b256;
  --accent-cool:   #58a6cf;
  --accent-tint:   #2a1916;
  --ok:            #5cc093;
  --shadow-sm:     0 1px 2px rgba(0,0,0,.4);
  --shadow:        0 6px 22px rgba(0,0,0,.45);
  --shadow-lg:     0 16px 50px rgba(0,0,0,.55);
}

/* ---------------------------------------------------------------- reset */
*,*::before,*::after { box-sizing: border-box; }
* { margin: 0; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *,*::before,*::after { animation-duration:.001ms !important; animation-iteration-count:1 !important; transition-duration:.001ms !important; }
}
body {
  font-family: var(--ff-body);
  background: var(--bg);
  color: var(--ink);
  line-height: 1.65;
  font-size: 17px;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  font-feature-settings: "kern","liga","cv05","ss01";
  transition: background .4s var(--ease), color .3s var(--ease);
  overflow-x: hidden;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
:focus-visible { outline: 2.5px solid var(--accent); outline-offset: 3px; border-radius: 3px; }

/* ---------------------------------------------------------------- type */
h1,h2,h3,h4 { font-family: var(--ff-display); font-weight: 540; line-height: 1.1; letter-spacing: -.01em; color: var(--ink); }
h1 { font-size: clamp(2.4rem, 5.4vw, 4.1rem); font-weight: 560; letter-spacing: -.025em; }
h2 { font-size: clamp(1.7rem, 3.4vw, 2.5rem); }
h3 { font-size: 1.28rem; }
p  { color: var(--ink-soft); }
.eyebrow {
  font-family: var(--ff-mono); font-size: .74rem; font-weight: 500;
  letter-spacing: .22em; text-transform: uppercase; color: var(--accent);
  display: inline-flex; align-items: center; gap: .55rem;
}
.eyebrow::before { content:""; width: 26px; height: 2px; background: var(--accent); display:inline-block; }
.lede { font-size: clamp(1.05rem, 1.7vw, 1.22rem); color: var(--ink-soft); }
.mono { font-family: var(--ff-mono); }

/* ---------------------------------------------------------------- layout */
.wrap { width: 100%; max-width: var(--maxw); margin-inline: auto; padding-inline: clamp(20px, 5vw, 44px); }
.section { padding-block: clamp(56px, 9vw, 104px); }
.section--tight { padding-block: clamp(40px, 6vw, 70px); }
.section-head { max-width: 720px; margin-bottom: clamp(30px, 5vw, 54px); }
.section-head h2 { margin: .5rem 0 .7rem; }
.section-head p { font-size: 1.06rem; }

/* ---------------------------------------------------------------- header / nav */
.site-header {
  position: sticky; top: 0; z-index: 100;
  height: var(--header-h);
  display: flex; align-items: center;
  backdrop-filter: saturate(150%) blur(14px);
  -webkit-backdrop-filter: saturate(150%) blur(14px);
  background: color-mix(in srgb, var(--bg) 80%, transparent);
  border-bottom: 1px solid transparent;
  transition: border-color .3s, background .3s;
}
.site-header.scrolled { border-bottom-color: var(--line); }
.site-header .wrap { display: flex; align-items: center; justify-content: space-between; gap: 1rem; }
.brand { display: flex; align-items: center; gap: .6rem; font-family: var(--ff-display); font-weight: 600; font-size: 1.12rem; letter-spacing: -.01em; }
.brand .glyph {
  width: 34px; height: 34px; border-radius: 9px; flex: none;
  background: linear-gradient(135deg, var(--accent), var(--accent-warm));
  display: grid; place-items: center; color: #fff; box-shadow: var(--shadow-sm);
  position: relative; overflow: hidden;
}
.brand .glyph svg { width: 20px; height: 20px; }
.nav { display: flex; align-items: center; gap: .15rem; }
.nav a {
  font-size: .93rem; font-weight: 500; color: var(--ink-soft);
  padding: .5rem .72rem; border-radius: 8px; transition: color .2s, background .2s;
}
.nav a:hover { color: var(--ink); background: var(--bg-sunken); }
.nav a.active { color: var(--accent); }
.nav-tools { display: flex; align-items: center; gap: .4rem; }
.icon-btn {
  width: 38px; height: 38px; border-radius: 9px; border: 1px solid var(--line);
  background: var(--bg-raised); color: var(--ink-soft); cursor: pointer;
  display: grid; place-items: center; transition: all .2s var(--ease);
}
.icon-btn:hover { color: var(--accent); border-color: var(--line-strong); transform: translateY(-1px); }
.icon-btn svg { width: 18px; height: 18px; }
.theme-toggle .moon { display: none; }
html[data-theme="dark"] .theme-toggle .sun { display: none; }
html[data-theme="dark"] .theme-toggle .moon { display: block; }
.menu-btn { display: none; }

/* mobile nav */
@media (max-width: 860px) {
  .menu-btn { display: grid; }
  .nav {
    position: fixed; inset: var(--header-h) 0 auto 0;
    flex-direction: column; align-items: stretch; gap: 0;
    background: var(--bg-raised); border-bottom: 1px solid var(--line);
    padding: .6rem clamp(20px,5vw,44px) 1rem;
    box-shadow: var(--shadow);
    transform: translateY(-130%); transition: transform .35s var(--ease);
  }
  .nav.open { transform: translateY(0); }
  .nav a { padding: .8rem .4rem; font-size: 1rem; border-bottom: 1px solid var(--line); }
  .nav a:last-child { border-bottom: 0; }
}

/* ---------------------------------------------------------------- buttons */
.btn {
  display: inline-flex; align-items: center; gap: .5rem;
  font-family: var(--ff-body); font-size: .94rem; font-weight: 550;
  padding: .7rem 1.2rem; border-radius: 10px; cursor: pointer;
  border: 1px solid transparent; transition: all .2s var(--ease); white-space: nowrap;
}
.btn svg { width: 16px; height: 16px; }
.btn--primary { background: var(--ink); color: var(--bg); }
.btn--primary:hover { background: var(--accent); transform: translateY(-2px); box-shadow: var(--shadow); }
.btn--ghost { background: transparent; color: var(--ink); border-color: var(--line-strong); }
.btn--ghost:hover { border-color: var(--accent); color: var(--accent); transform: translateY(-2px); }
.btn--sm { padding: .42rem .8rem; font-size: .84rem; border-radius: 8px; }

/* ---------------------------------------------------------------- waveform divider (signature) */
.wave-rule { display: flex; align-items: center; gap: 3px; height: 26px; opacity: .5; }
.wave-rule span { width: 3px; border-radius: 2px; background: var(--accent); animation: wv 2.6s var(--ease) infinite; }
@keyframes wv { 0%,100% { height: 20%; } 50% { height: 100%; } }

/* ---------------------------------------------------------------- footer */
.site-footer { border-top: 1px solid var(--line); background: var(--bg-sunken); padding-block: 48px 36px; margin-top: 40px; }
.site-footer .wrap { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 2.5rem; }
.site-footer h4 { font-family: var(--ff-mono); font-size: .76rem; font-weight: 600; letter-spacing: .16em; text-transform: uppercase; color: var(--ink-faint); margin-bottom: 1rem; }
.site-footer a { color: var(--ink-soft); font-size: .94rem; display: block; padding: .25rem 0; transition: color .2s; }
.site-footer a:hover { color: var(--accent); }
.foot-brand { font-family: var(--ff-display); font-size: 1.3rem; margin-bottom: .5rem; }
.foot-bottom { border-top: 1px solid var(--line); margin-top: 36px; padding-top: 22px; font-size: .82rem; color: var(--ink-faint); display:flex; justify-content: space-between; flex-wrap: wrap; gap: .5rem; }
@media (max-width: 740px){ .site-footer .wrap { grid-template-columns: 1fr 1fr; } .foot-brand-col { grid-column: 1 / -1; } }

/* ---------------------------------------------------------------- cards / chips */
.chip {
  display: inline-flex; align-items: center; gap: .4rem;
  font-size: .82rem; font-weight: 500; padding: .32rem .7rem;
  border-radius: 100px; background: var(--bg-sunken); color: var(--ink-soft);
  border: 1px solid var(--line);
}
.chip--accent { background: var(--accent-tint); color: var(--accent-deep); border-color: transparent; }
html[data-theme="dark"] .chip--accent { color: var(--accent); }
.tag-mono { font-family: var(--ff-mono); font-size: .72rem; letter-spacing: .04em; }

.card {
  background: var(--bg-raised); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 1.5rem;
  transition: transform .3s var(--ease), box-shadow .3s var(--ease), border-color .3s;
}
.card:hover { transform: translateY(-4px); box-shadow: var(--shadow); border-color: var(--line-strong); }

/* ---------------------------------------------------------------- reveal anim */
.reveal { opacity: 0; transform: translateY(22px); transition: opacity .7s var(--ease), transform .7s var(--ease); }
.reveal.in { opacity: 1; transform: none; }
.reveal[data-d="1"]{ transition-delay:.07s } .reveal[data-d="2"]{ transition-delay:.14s }
.reveal[data-d="3"]{ transition-delay:.21s } .reveal[data-d="4"]{ transition-delay:.28s }
.no-js .reveal { opacity: 1 !important; transform: none !important; }

/* ---------------------------------------------------------------- utilities */
.grid { display: grid; gap: 1.25rem; }
.cols-2 { grid-template-columns: repeat(2,1fr); }
.cols-3 { grid-template-columns: repeat(3,1fr); }
@media (max-width: 820px){ .cols-3 { grid-template-columns: 1fr 1fr; } }
@media (max-width: 600px){ .cols-2,.cols-3 { grid-template-columns: 1fr; } }
.center { text-align: center; }
.muted { color: var(--ink-faint); }
.accent { color: var(--accent); }
.skip-link { position: absolute; left: -999px; top: 8px; background: var(--ink); color: var(--bg); padding: .6rem 1rem; border-radius: 8px; z-index: 200; }
.skip-link:focus { left: 12px; }

/* page hero (interior pages) */
.page-hero { padding-block: clamp(46px,8vw,86px) clamp(28px,4vw,44px); border-bottom: 1px solid var(--line); position: relative; overflow: hidden; }
.page-hero h1 { margin: .6rem 0 .8rem; }
.page-hero .lede { max-width: 680px; }
.page-hero .spec-bg { position:absolute; inset:0; opacity:.5; pointer-events:none; -webkit-mask-image: linear-gradient(90deg,transparent, #000 40%); mask-image: linear-gradient(90deg,transparent,#000 40%); }