/* study.mindworkz.ai: landing + sign-in pages. Same tokens as the app (shell.css). */
:root {
  --bg: #f8faf5; --paper: #ffffff; --ink: #191c1a; --ink-soft: #5e655d; --line: #e2e5e1;
  --accent: #0d5026; --accent-2: #1d7a3c; --accent-ink: #ffffff; --tint: #eaf4ed;
  --hum: #a13d3c; --sci: #c96f00; --ai: #6000d2; --ai-bg: rgba(96, 0, 210, .07);
  --bad: #a13d3c; --bad-bg: #ffe4e1; --good-bg: #eaf4ed;
  --shadow: 0 12px 32px -8px rgba(13, 80, 38, .16), 0 2px 6px rgba(0, 0, 0, .04);
  --ui: "Plus Jakarta Sans", "PingFang HK", "Noto Sans TC", "Microsoft JhengHei", system-ui, sans-serif;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #101412; --paper: #181d1a; --ink: #e3e6e1; --ink-soft: #a5ada3; --line: #2c332e;
    --accent: #94d69e; --accent-2: #94d69e; --accent-ink: #0b1a10; --tint: #1d2d22;
    --hum: #ffb3af; --sci: #ffc277; --ai: #c79bff; --ai-bg: rgba(199, 155, 255, .1);
    --bad: #ffb3af; --bad-bg: #3b1d1c; --good-bg: #1d2d22;
    --shadow: 0 12px 32px rgb(0 0 0 / .45); color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #101412; --paper: #181d1a; --ink: #e3e6e1; --ink-soft: #a5ada3; --line: #2c332e;
  --accent: #94d69e; --accent-2: #94d69e; --accent-ink: #0b1a10; --tint: #1d2d22;
  --hum: #ffb3af; --sci: #ffc277; --ai: #c79bff; --ai-bg: rgba(199, 155, 255, .1);
  --bad: #ffb3af; --bad-bg: #3b1d1c; --good-bg: #1d2d22;
  --shadow: 0 12px 32px rgb(0 0 0 / .45); color-scheme: dark;
}
* { box-sizing: border-box; }
html, body { margin: 0; }
body { background: var(--bg); color: var(--ink); font: 16px/1.55 var(--ui); -webkit-font-smoothing: antialiased; }
a { color: var(--accent); }
.zh { font-weight: 500; color: var(--ink-soft); }

/* top bar */
.top { max-width: 1120px; margin: 0 auto; padding: 18px 20px; display: flex; align-items: center; gap: 12px; }
.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--ink); text-decoration: none; font-weight: 800; }
.brand .mark svg { width: 34px; height: 34px; display: block; border-radius: 9px; }
.brand .word svg { height: 20px; width: auto; display: block; }
.brand .tag { font-weight: 700; color: var(--accent); border-left: 1px solid var(--line); padding-left: 10px; }
.top nav { margin-left: auto; display: flex; gap: 8px; }
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; min-height: 44px; padding: 0 20px; border-radius: 999px; border: 1px solid var(--line);
  background: var(--paper); color: var(--ink); font: 700 15px var(--ui); text-decoration: none; cursor: pointer; transition: transform .15s, box-shadow .15s, background .15s; }
.btn:hover { transform: translateY(-1px); box-shadow: var(--shadow); }
.btn.primary { background: var(--accent); color: var(--accent-ink); border-color: transparent; }
.btn.block { width: 100%; }
.btn[disabled] { opacity: .6; cursor: progress; transform: none; box-shadow: none; }

/* landing */
.hero { max-width: 1120px; margin: 0 auto; padding: 40px 20px 56px; display: grid; grid-template-columns: 1.05fr .95fr; gap: 48px; align-items: center; }
.eyebrow { display: inline-block; font-size: 13px; font-weight: 700; letter-spacing: .04em; color: var(--accent); background: var(--tint); padding: 6px 12px; border-radius: 999px; }
.hero h1 { font-size: clamp(34px, 5vw, 56px); line-height: 1.08; letter-spacing: -.02em; margin: 18px 0 16px; }
.hero h1 em { font-style: normal; color: var(--accent); }
.hero p.lead { font-size: 18px; color: var(--ink-soft); max-width: 34em; margin: 0 0 28px; }
.cta { display: flex; flex-wrap: wrap; gap: 10px; }
.cta .btn { min-height: 50px; padding: 0 26px; font-size: 16px; }
.small { font-size: 14px; color: var(--ink-soft); margin-top: 14px; }

.preview { background: var(--paper); border: 1px solid var(--line); border-radius: 24px; box-shadow: var(--shadow); padding: 22px; display: grid; gap: 12px; }
.pv-head { display: flex; align-items: baseline; justify-content: space-between; }
.pv-head b { font-size: 20px; }
.pv-head span { font-size: 13px; color: var(--ink-soft); }
.pv-row { display: grid; grid-template-columns: 44px 1fr auto; gap: 12px; align-items: center; padding: 12px; border-radius: 16px; background: var(--bg); }
.pv-ic { width: 44px; height: 44px; border-radius: 12px; display: grid; place-items: center; font-size: 22px; color: #fff; }
.pv-row small { display: block; color: var(--ink-soft); font-size: 13px; }
.pv-bar { width: 72px; height: 8px; border-radius: 8px; background: var(--line); overflow: hidden; }
.pv-bar i { display: block; height: 100%; background: var(--accent-2); border-radius: 8px; }
.pv-ai { border: 1px dashed var(--ai); background: var(--ai-bg); color: var(--ink); border-radius: 16px; padding: 12px 14px; font-size: 14px; }
.pv-ai b { color: var(--ai); }

.features { max-width: 1120px; margin: 0 auto; padding: 8px 20px 64px; }
.features h2 { font-size: 28px; margin: 0 0 20px; letter-spacing: -.01em; }
.grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.card { background: var(--paper); border: 1px solid var(--line); border-radius: 20px; padding: 20px; }
.card .ic { font-size: 26px; }
.card h3 { margin: 8px 0 6px; font-size: 18px; }
.card p { margin: 0; color: var(--ink-soft); font-size: 15px; }
.trust { max-width: 1120px; margin: 0 auto 56px; padding: 0 20px; }
.trust .card { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; background: var(--tint); border: 0; }
.trust h3 { margin: 0 0 4px; font-size: 16px; }
.trust p { margin: 0; font-size: 14px; color: var(--ink-soft); }
footer { border-top: 1px solid var(--line); color: var(--ink-soft); font-size: 13px; }
footer div { max-width: 1120px; margin: 0 auto; padding: 20px; display: flex; gap: 16px; flex-wrap: wrap; justify-content: space-between; }

/* auth pages */
.auth-wrap { min-height: calc(100vh - 80px); display: grid; place-items: center; padding: 16px 16px 48px; }
.auth { width: 100%; max-width: 420px; background: var(--paper); border: 1px solid var(--line); border-radius: 24px; box-shadow: var(--shadow); padding: 28px; }
.auth h1 { font-size: 26px; margin: 0 0 6px; letter-spacing: -.01em; }
.auth p.sub { margin: 0 0 22px; color: var(--ink-soft); font-size: 15px; }
.field { display: grid; gap: 6px; margin-bottom: 14px; font-weight: 600; font-size: 14px; }
.field input { font: 16px var(--ui); color: var(--ink); background: var(--bg); border: 1px solid var(--line); border-radius: 12px; min-height: 48px; padding: 0 14px; width: 100%; }
.field input:focus { outline: 2px solid var(--accent); outline-offset: 1px; border-color: transparent; }
.pw { position: relative; }
.pw button { position: absolute; right: 6px; top: 50%; transform: translateY(-50%); border: 0; background: none; color: var(--ink-soft); font: 600 13px var(--ui); padding: 8px; cursor: pointer; }
.row-between { display: flex; justify-content: space-between; align-items: center; gap: 8px; margin: -4px 0 16px; font-size: 14px; }
.alt { text-align: center; font-size: 14px; color: var(--ink-soft); margin: 18px 0 0; }
.msg { border-radius: 12px; padding: 10px 12px; font-size: 14px; margin: 0 0 14px; }
.msg.err { background: var(--bad-bg); color: var(--bad); }
.msg.ok { background: var(--good-bg); color: var(--accent); }
.hint { font-size: 13px; color: var(--ink-soft); font-weight: 500; }

@media (max-width: 880px) {
  .hero { grid-template-columns: 1fr; gap: 32px; padding-top: 16px; }
  .grid, .trust .card { grid-template-columns: 1fr; }
  .brand .tag { display: none; }
}
@media (max-width: 420px) {
  .top { padding: 14px 16px; }
  .top nav .btn:not(.primary) { display: none; }
  .auth { padding: 22px 18px; }
}