/* Tīngshuō: mobile-first, system fonts only (no Chinese web fonts to download). */

:root {
  --paper: #faf7f2;
  --card: #ffffff;
  --ink: #1f1b16;
  --muted: #6b645a;
  --line: #e7e0d5;
  --accent: #b23a2b;
  --accent-soft: #f6e4df;
  --ok: #2f7d4f;
  --radius: 14px;
  --font-latin: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-zh: "PingFang SC", "Hiragino Sans GB", "Noto Sans CJK SC", "Microsoft YaHei", sans-serif;
  --font-my: "Myanmar Sangam MN", "Noto Sans Myanmar", "Padauk", sans-serif;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #171512;
    --card: #221f1b;
    --ink: #f1ece4;
    --muted: #a59d91;
    --line: #36312a;
    --accent: #e0705f;
    --accent-soft: #3a2421;
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-latin);
  line-height: 1.5;
}

[lang="zh-Hans"], .zh, .vocab-zh, .path-hanzi { font-family: var(--font-zh), var(--font-latin); }
[lang="my"] { font-family: var(--font-my); }

a { color: var(--accent); }

/* Top bar */
.topbar {
  position: sticky; top: 0; z-index: 5;
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  padding: calc(10px + env(safe-area-inset-top)) 16px 10px;
  background: color-mix(in srgb, var(--paper) 88%, transparent);
  backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.brand { display: flex; align-items: baseline; gap: 8px; text-decoration: none; color: var(--ink); }
.brand-hanzi { font-family: var(--font-zh); font-size: 1.35rem; font-weight: 700; color: var(--accent); }
.brand-latin { font-size: .95rem; color: var(--muted); }
.topbar-actions { display: flex; gap: 8px; align-items: center; }
.topbar-actions form { margin: 0; }

.chip {
  font: inherit; font-size: .85rem;
  padding: 6px 12px; border-radius: 999px;
  border: 1px solid var(--line); background: var(--card); color: var(--ink);
  cursor: pointer;
}
.chip[aria-pressed="true"] { border-color: var(--accent); color: var(--accent); }
.chip-quiet { color: var(--muted); }

/* Page */
.page { max-width: 720px; margin: 0 auto; padding: 16px 16px calc(40px + env(safe-area-inset-bottom)); }
.section-title { font-size: .8rem; letter-spacing: .08em; text-transform: uppercase; color: var(--muted); margin: 28px 0 10px; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 14px 16px; }

/* Ruby: pinyin above characters */
ruby { ruby-position: over; }
rt { font-family: var(--font-latin); font-size: .5em; color: var(--muted); letter-spacing: 0; }
body.pinyin-off rt { display: none; }
.word { display: inline-block; margin-right: .08em; }
.punct { color: var(--muted); }

/* Login */
.login { max-width: 380px; margin: 8vh auto 0; text-align: center; }
.login-hanzi { font-size: 3.2rem; font-weight: 700; color: var(--accent); margin: 0; line-height: 2; }
.login-tagline { color: var(--muted); margin: 0 0 24px; }
.form { display: grid; gap: 14px; text-align: left; }
.form label { display: grid; gap: 6px; font-size: .9rem; color: var(--muted); }
.form input {
  font: inherit; font-size: 1rem; color: var(--ink);
  padding: 12px; border-radius: 10px; border: 1px solid var(--line); background: var(--paper);
}
.form input:focus { outline: 2px solid var(--accent); outline-offset: 1px; }
.button {
  font: inherit; font-weight: 600; font-size: 1rem;
  padding: 12px; border: 0; border-radius: 10px; background: var(--accent); color: #fff; cursor: pointer;
}
.alert { margin: 0; padding: 10px 12px; border-radius: 10px; background: var(--accent-soft); color: var(--accent); }

/* Lesson path */
.greeting { font-size: 1.5rem; margin: 8px 0 0; }
.path { list-style: none; margin: 0; padding: 0; display: grid; gap: 10px; }
.path-link {
  display: grid; grid-template-columns: 44px 1fr; grid-template-areas: "num text" "num meta";
  column-gap: 12px; align-items: center;
  padding: 12px 14px; border-radius: var(--radius); border: 1px solid var(--line);
  background: var(--card); color: var(--ink); text-decoration: none;
}
.path-number {
  grid-area: num; width: 44px; height: 44px; border-radius: 50%;
  display: grid; place-items: center; font-weight: 700;
  background: var(--accent); color: #fff;
}
.path-text { grid-area: text; display: flex; flex-wrap: wrap; align-items: baseline; gap: 4px 10px; }
.path-hanzi { font-size: 1.25rem; font-weight: 600; }
.path-pinyin { color: var(--accent); }
.path-en { color: var(--muted); width: 100%; font-size: .9rem; }
.path-meta { grid-area: meta; font-size: .8rem; color: var(--muted); }
.is-soon .path-link { opacity: .55; }
.is-soon .path-number { background: var(--line); color: var(--muted); }
.is-ready .path-link:active { transform: scale(.99); }

/* Lesson page */
.back { display: inline-block; margin: 4px 0 8px; text-decoration: none; font-size: .9rem; }
.lesson-head h1 { font-size: 2.4rem; margin: 0; line-height: 1.9; }
.lesson-number { margin: 0; color: var(--muted); font-size: .85rem; text-transform: uppercase; letter-spacing: .08em; }
.lesson-en { margin: 0; font-size: 1.1rem; }
.practice-soon { margin: 12px 0 0; padding: 8px 12px; border-radius: 10px; background: var(--accent-soft); color: var(--accent); font-size: .85rem; }

.cards { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 10px; }
.vocab { display: grid; gap: 2px; }
.vocab-zh { font-size: 1.6rem; line-height: 1.9; }
.vocab-en { font-size: .9rem; }
.vocab-my { font-size: .85rem; color: var(--muted); }

.patterns, .examples { list-style: none; padding: 0; margin: 0; display: grid; gap: 10px; }
.patterns .card { display: grid; gap: 2px; }
.pattern-zh { font-size: 1.15rem; font-weight: 600; }
.pattern-py { color: var(--accent); font-size: .9rem; }
.pattern-en { color: var(--muted); font-size: .9rem; }

.zh { font-size: 1.35rem; line-height: 2.1; margin: 0; overflow-wrap: anywhere; }
.card, .line > div { min-width: 0; }
.en { margin: 0 0 6px; color: var(--muted); font-size: .9rem; }

.dialogue { list-style: none; padding: 0; margin: 0; display: grid; gap: 10px; }
.line { display: grid; grid-template-columns: 34px 1fr; gap: 10px; align-items: start; }
.speaker {
  width: 34px; height: 34px; border-radius: 50%; display: grid; place-items: center;
  font-weight: 700; font-size: .85rem; margin-top: 14px;
}
.speaker-a .speaker { background: var(--accent); color: #fff; }
.speaker-b .speaker { background: var(--ink); color: var(--paper); }
.line > div { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 6px 14px; }
.reading { display: grid; gap: 4px; }

.error-page { text-align: center; margin-top: 10vh; }