/* StudyMate demo site. Light and dark both, because a study app that burns your
   retinas at midnight has already lost the argument. */

:root {
  --bg: #f7f7fb;
  --card: #fff;
  --ink: #17172b;
  --muted: #62627a;
  --line: #e3e3ee;
  --accent: #6366f1;
  --accent-ink: #fff;
  --good: #0f7a4d;
  --good-bg: #e8f7ef;
  --bad: #b4232b;
  --bad-bg: #fdeced;
  --warn-bg: #fff8e6;
  --warn-line: #f0d590;
  --radius: 14px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0e0e16;
    --card: #17172a;
    --ink: #eeeef6;
    --muted: #9a9ab5;
    --line: #2a2a44;
    --good: #5ddba0;
    --good-bg: #12291f;
    --bad: #ff8b90;
    --bad-bg: #2c1418;
    --warn-bg: #2a2313;
    --warn-line: #5c4a1e;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 16px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3 { line-height: 1.2; margin: 0 0 12px; }
p { margin: 0 0 12px; }
.muted, .sub, .fine { color: var(--muted); }
.fine { font-size: 13px; }
.sub { font-size: 14px; }

section { max-width: 1000px; margin: 0 auto; padding: 64px 20px; }

/* ------------------------------------------------------------------ chrome */

.nav {
  position: sticky; top: 0; z-index: 5;
  display: flex; align-items: center; justify-content: space-between;
  gap: 16px; padding: 14px 20px;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.logo { font-weight: 700; letter-spacing: -0.01em; }
.nav nav { display: flex; align-items: center; gap: 18px; }
.nav a { color: var(--ink); text-decoration: none; font-size: 14px; }

.btn {
  display: inline-block; padding: 11px 18px; border-radius: 10px;
  border: 1px solid var(--line); background: var(--card); color: var(--ink);
  font-weight: 600; font-size: 15px; text-decoration: none; cursor: pointer;
}
.btn.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); }
.btn.small { padding: 7px 13px; font-size: 14px; }
.btn.big { padding: 15px 26px; font-size: 17px; }
.btn:hover { filter: brightness(1.06); }

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

.hero { text-align: center; padding-top: 80px; padding-bottom: 40px; }
.hero h1 { font-size: clamp(30px, 5.2vw, 52px); letter-spacing: -0.025em; }
.lede { font-size: clamp(16px, 2.1vw, 20px); color: var(--muted); max-width: 640px; margin: 0 auto 26px; }
.cta { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; margin-bottom: 14px; }

/* -------------------------------------------------------------------- demo */

.demo h2 { font-size: clamp(24px, 3.4vw, 34px); letter-spacing: -0.02em; }
.demo > .sub { max-width: 640px; margin-bottom: 24px; }

.panel {
  background: var(--card); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 22px;
}

.row { display: flex; gap: 12px; align-items: center; flex-wrap: wrap; }
.spread { justify-content: space-between; }

.hours-card { border: 1px solid var(--line); border-radius: 12px; padding: 14px 16px; margin-bottom: 18px; }
.tot { font-variant-numeric: tabular-nums; color: var(--muted); font-size: 14px; }
.hours { display: grid; grid-template-columns: repeat(7, minmax(0, 1fr)); gap: 10px; margin-top: 12px; }
@media (max-width: 640px) { .hours { grid-template-columns: repeat(4, minmax(0, 1fr)); } }

.hcell { display: flex; flex-direction: column; align-items: center; gap: 6px; font-size: 13px; }
.hcell span { color: var(--muted); }
.hcell output { font-variant-numeric: tabular-nums; font-weight: 600; }
.hcell input[type=range] { width: 100%; accent-color: var(--accent); }

/* The verdict. Big, plain, and permitted to be bad news. */
.verdict { border-radius: 12px; padding: 16px 18px; margin-bottom: 18px; border: 1px solid var(--line); }
/* Only the headline is a block. The bold bits inside a sentence ("9 h 45 min
   short") have to stay inline, or the verdict reads like a ransom note. */
.verdict > strong { display: block; font-size: 19px; margin-bottom: 6px; }
.verdict p { margin: 0 0 6px; font-size: 15px; }
.verdict p:last-child { margin-bottom: 0; }
.verdict.good { background: var(--good-bg); border-color: color-mix(in srgb, var(--good) 35%, transparent); }
.verdict.good > strong { color: var(--good); }
.verdict.bad { background: var(--bad-bg); border-color: color-mix(in srgb, var(--bad) 35%, transparent); }
.verdict.bad > strong { color: var(--bad); }

.tbl { width: 100%; border-collapse: collapse; margin-bottom: 26px; font-size: 15px; }
.tbl th {
  text-align: left; font-size: 12px; text-transform: uppercase; letter-spacing: 0.05em;
  color: var(--muted); font-weight: 600; padding: 8px 10px; border-bottom: 1px solid var(--line);
}
.tbl td { padding: 11px 10px; border-bottom: 1px solid var(--line); vertical-align: middle; }
.tbl td .sub { display: block; }
.tbl tr:last-child td { border-bottom: 0; }
.row-bad td:first-child { box-shadow: inset 3px 0 0 var(--bad); }

.pill { display: inline-block; padding: 3px 10px; border-radius: 999px; font-size: 13px; font-weight: 600; white-space: nowrap; }
.pill.ok { background: var(--good-bg); color: var(--good); }
.pill.no { background: var(--bad-bg); color: var(--bad); }

/* Week grid. minmax(0,1fr) on purpose: a plain 1fr track floors at min-content,
   and one long topic name would shove the grid out of its own card. */
.week { display: grid; grid-template-columns: repeat(7, minmax(0, 1fr)); gap: 8px; margin-bottom: 12px; }
@media (max-width: 760px) { .week { grid-template-columns: repeat(2, minmax(0, 1fr)); } }

.day { min-width: 0; border: 1px solid var(--line); border-radius: 10px; padding: 8px; min-height: 90px; }
.dhead { display: flex; justify-content: space-between; font-size: 12px; font-weight: 600; margin-bottom: 6px; }
.dhead .sub { color: var(--muted); font-weight: 400; }
.empty { color: var(--muted); font-size: 12px; padding: 6px 2px; }

.blk {
  display: block; min-width: 0; overflow: hidden;
  border-left: 4px solid var(--accent);
  background: color-mix(in srgb, var(--accent) 8%, var(--card));
  border-radius: 6px; padding: 6px 8px; margin-bottom: 6px;
}
.blk.rev { border-left-color: var(--good); background: color-mix(in srgb, var(--good) 9%, var(--card)); }
.blk .subj { display: block; font-size: 9px; font-weight: 700; letter-spacing: 0.07em; text-transform: uppercase; color: var(--accent); }
.blk.rev .subj { color: var(--good); }
.blk .topic { display: block; font-size: 12px; font-weight: 600; line-height: 1.25; margin: 1px 0 2px; }
.blk .when { display: block; font-size: 11px; color: var(--muted); font-variant-numeric: tabular-nums; }

/* --------------------------------------------------------------------- why */

.why h2 { font-size: clamp(24px, 3.4vw, 34px); letter-spacing: -0.02em; margin-bottom: 22px; }
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 16px; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 20px; }
.card h3 { font-size: 17px; }
.card p { margin: 0; color: var(--muted); font-size: 15px; }

/* --------------------------------------------------------------------- get */

.get { text-align: center; }
.get h2 { font-size: clamp(24px, 3.4vw, 34px); letter-spacing: -0.02em; }
.get > .sub { margin-bottom: 20px; }
.get .fine { max-width: 560px; margin: 18px auto 0; }

.warnbox {
  text-align: left; max-width: 620px; margin: 32px auto 0;
  background: var(--warn-bg); border: 1px solid var(--warn-line);
  border-radius: var(--radius); padding: 20px;
}
.warnbox h3 { font-size: 16px; }
.warnbox p { font-size: 14px; margin-bottom: 8px; }
.warnbox p:last-child { margin-bottom: 0; }

footer { border-top: 1px solid var(--line); padding: 26px 20px; text-align: center; }
footer p { margin: 0; color: var(--muted); font-size: 14px; }