/* ==========================================================================
   Hub: hero, rails, library, footer
   ========================================================================== */

/* ---------------- hero ---------------- */

.hero {
  position: relative; overflow: hidden;
  border-bottom: 1.5px solid var(--border-soft);
  background:
    radial-gradient(760px 380px at 82% 10%, color-mix(in srgb, var(--turquoise) 20%, transparent), transparent 65%),
    radial-gradient(680px 420px at 12% 90%, color-mix(in srgb, var(--gold) 24%, transparent), transparent 62%),
    var(--surface);
}
.hero .wrap { padding-block: clamp(2rem, 5vw, 3.6rem); position: relative; z-index: 1; }
.hero-grid { display: grid; gap: 2rem; align-items: center; grid-template-columns: 1.15fr .85fr; }
.hero h1 { font-size: clamp(2.1rem, 5.2vw, 3.4rem); margin-bottom: .5rem; }
.hero h1 em { font-style: normal; color: var(--gold-deep); }
.hero-sub { font-size: clamp(1rem, 1.9vw, 1.2rem); color: var(--ink-2); max-width: 52ch; margin-bottom: 1.3rem; }
.hero-cta { display: flex; gap: .6rem; flex-wrap: wrap; }
.hero-facts { display: flex; gap: 1.6rem; margin-top: 1.6rem; flex-wrap: wrap; }
.hero-fact b { display: block; font-family: var(--font-display); font-weight: 800; font-size: 1.5rem; line-height: 1; }
.hero-fact span { font-size: .8rem; color: var(--ink-2); text-transform: uppercase; letter-spacing: .05em; font-weight: 700; }

.hero-art {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: .6rem;
  transform: rotate(-3deg);
}
.hero-chip {
  aspect-ratio: 1; border-radius: var(--r-lg); display: grid; place-items: center;
  font-size: clamp(24px, 4vw, 40px);
  background: var(--surface); border: 1.5px solid var(--border-soft);
  box-shadow: var(--shadow-2);
  animation: hero-bob 6s ease-in-out infinite;
}
.hero-chip:nth-child(2n) { animation-delay: -1.4s; }
.hero-chip:nth-child(3n) { animation-delay: -2.9s; background: var(--surface-2); }
@keyframes hero-bob { 50% { transform: translateY(-8px); } }

/* signed-in variant */
.welcome { background: var(--surface); border-bottom: 1.5px solid var(--border-soft); }
.welcome .wrap { padding-block: 1.4rem; }
.welcome-grid { display: flex; gap: 1.2rem; align-items: center; flex-wrap: wrap; }
.welcome-avatar {
  width: 62px; height: 62px; border-radius: var(--r-lg); flex: none;
  display: grid; place-items: center; font-size: 32px;
  background: var(--lapis-soft); border: 2px solid var(--border);
}
.welcome-name { font-family: var(--font-display); font-weight: 800; font-size: 1.5rem; line-height: 1.1; }
.welcome-meta { display: flex; gap: .5rem; flex-wrap: wrap; margin-top: .3rem; }
.welcome-xp { margin-left: auto; min-width: 190px; }

/* ---------------- rails ---------------- */

.rail { margin-top: 1.75rem; }
.rail-head { display: flex; align-items: baseline; gap: .7rem; margin-bottom: .75rem; flex-wrap: wrap; }
.rail-head h2 { margin: 0; font-size: 1.3rem; }
.rail-head p { margin: 0; color: var(--ink-2); font-size: .9rem; }
.rail-scroll {
  display: grid; grid-auto-flow: column; grid-auto-columns: minmax(228px, 1fr);
  gap: 1rem; overflow-x: auto; padding-bottom: .6rem; scroll-snap-type: x proximity;
  scrollbar-width: thin;
}
.rail-scroll > * { scroll-snap-align: start; }

/* assignment cards */
.assign {
  display: flex; gap: .8rem; align-items: center;
  padding: .8rem 1rem; border-radius: var(--r-lg);
  background: var(--surface); border: 1.5px solid var(--border-soft);
  box-shadow: var(--shadow-1); text-decoration: none; color: inherit;
  transition: transform .15s, box-shadow .15s;
}
.assign:hover { transform: translateY(-3px); box-shadow: var(--shadow-2); }
.assign-ico { width: 46px; height: 46px; flex: none; border-radius: 12px; display: grid; place-items: center; font-size: 24px; background: var(--surface-3); }
.assign-body { flex: 1; min-width: 0; }
.assign-title { font-family: var(--font-display); font-weight: 800; }
.assign-meta { font-size: .82rem; color: var(--ink-2); }
.assign.done { background: var(--ok-soft); border-color: color-mix(in srgb, var(--ok) 35%, transparent); }
.assign.overdue { border-color: var(--bad); }

/* weak-skill pills */
.weak-row { display: flex; gap: .5rem; flex-wrap: wrap; }
.weak-pill {
  display: flex; align-items: center; gap: .5rem;
  padding: .45rem .8rem; border-radius: var(--r-full);
  background: var(--surface); border: 1.5px solid var(--border);
  font-family: var(--font-display); font-weight: 700; font-size: .88rem;
  cursor: pointer; text-decoration: none; color: inherit;
  transition: transform .13s, border-color .13s;
}
.weak-pill:hover { transform: translateY(-2px); border-color: var(--gold); }
.weak-pill .bar { width: 44px; height: 6px; border-radius: 99px; background: var(--surface-3); overflow: hidden; }
.weak-pill .bar i { display: block; height: 100%; background: var(--warn); }

/* ---------------- library ---------------- */

.lib-head { display: flex; align-items: center; justify-content: space-between; gap: 1rem; flex-wrap: wrap; margin-bottom: .9rem; }
.lib-controls { display: flex; gap: .5rem; align-items: center; flex-wrap: wrap; }
.lib-controls input[type=search] { min-width: 220px; }
.lib-controls select { min-width: 140px; }

.chip-row { display: flex; gap: .4rem; flex-wrap: wrap; }
.subject-chip {
  display: inline-flex; align-items: center; gap: .4rem;
  font-family: var(--font-display); font-weight: 700; font-size: .9rem;
  padding: .42rem .9rem; min-height: 40px; border-radius: var(--r-full);
  background: var(--surface); border: 2px solid var(--border); color: var(--ink);
  cursor: pointer; transition: all .14s;
}
.subject-chip:hover { transform: translateY(-2px); }
.subject-chip[aria-pressed='true'] {
  background: var(--c, var(--lapis)); border-color: var(--c, var(--lapis)); color: #fff;
}

/* ---------------- footer ---------------- */

.site-foot {
  border-top: 1.5px solid var(--border-soft);
  background: var(--surface);
  padding-block: 2.2rem 1.4rem; margin-top: 2rem;
}
.foot-grid { display: grid; grid-template-columns: 1.6fr repeat(3, 1fr); gap: 1.6rem; }
.foot-grid h3 { font-size: .82rem; text-transform: uppercase; letter-spacing: .07em; color: var(--ink-2); margin-bottom: .5rem; }
.foot-grid a { display: block; color: var(--ink-2); text-decoration: none; font-size: .92rem; padding: .16rem 0; }
.foot-grid a:hover { color: var(--lapis); }
.foot-bottom {
  display: flex; justify-content: space-between; gap: 1rem; flex-wrap: wrap;
  border-top: 1.5px solid var(--border-soft); margin-top: 1.6rem; padding-top: 1rem; font-size: .85rem;
}

@media (max-width: 860px) {
  .hero-grid { grid-template-columns: 1fr; }
  .hero-art { display: none; }
  .foot-grid { grid-template-columns: 1fr 1fr; }
  .welcome-xp { margin-left: 0; width: 100%; }
}