/* Emma's Notes V2 — calm paper-and-ink look to match the calligraphic brand */
:root {
  --paper: #faf9f6; --card: #ffffff; --ink: #1b1b1f; --muted: #6f6f76;
  --line: #e7e4dc; --accent: #23405f; --accent-soft: #eef3f8;
  --good: #2c7a4b; --warn: #a04b12; --bad: #b3372f;
  --radius: 14px;
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--paper); color: var(--ink);
  font: 16px/1.55 -apple-system, "SF Pro Text", "Segoe UI", Roboto, "PingFang SC", sans-serif;
  padding-bottom: 60px;
}
h1, h2, h3 { font-family: Georgia, "Songti SC", serif; font-weight: 600; margin: 0 0 .4em; }
h1 { font-size: 1.5rem; } h2 { font-size: 1.2rem; } h3 { font-size: 1.05rem; }
.muted { color: var(--muted); } .small { font-size: .85rem; }
button {
  font: inherit; border: 0; border-radius: 10px; padding: 9px 16px; cursor: pointer;
  background: var(--accent); color: #fff;
}
button.ghost { background: transparent; color: var(--accent); border: 1px solid var(--line); }
button.danger { background: transparent; color: var(--bad); border: 1px solid var(--line); }
button:disabled { opacity: .5; cursor: default; }
input, textarea, select {
  font: inherit; width: 100%; padding: 10px 12px; margin: 6px 0;
  border: 1px solid var(--line); border-radius: 10px; background: #fff; color: var(--ink);
}
textarea { min-height: 110px; resize: vertical; }

header#topbar {
  display: flex; align-items: center; gap: 10px;
  padding: 10px 16px; background: var(--card); border-bottom: 1px solid var(--line);
  position: sticky; top: 0; z-index: 5;
}
.brand-icon { width: 30px; height: 30px; border-radius: 8px; }
.brand { font-family: Georgia, serif; font-size: 1.15rem; font-weight: 600; }
.who { margin-left: auto; color: var(--muted); font-size: .9rem; }

main#app { max-width: 860px; margin: 0 auto; padding: 18px 14px; }

/* auth */
.auth { text-align: center; padding-top: 4vh; }
.auth .logo { width: 190px; max-width: 60vw; margin-bottom: 6px; }
.auth .card { max-width: 380px; margin: 0 auto; text-align: left; }
.err { color: var(--bad); min-height: 1.2em; margin: 6px 0 0; font-size: .9rem; }
#authSwitch a { color: var(--accent); cursor: pointer; text-decoration: underline; }

.card {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 18px; margin: 14px 0;
}
.rowhead { display: flex; align-items: center; justify-content: space-between; gap: 10px; flex-wrap: wrap; }
.rowhead h2 { margin: 0; }

.statrow { display: grid; grid-template-columns: repeat(auto-fit, minmax(120px, 1fr)); gap: 10px; margin: 14px 0; }
.stat { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 14px; text-align: center; }
.stat b { display: block; font-size: 1.6rem; font-family: Georgia, serif; }
.stat span { color: var(--muted); font-size: .85rem; }

.tabs { display: flex; gap: 8px; margin: 10px 0 4px; flex-wrap: wrap; }
.tab { background: transparent; color: var(--muted); border: 1px solid transparent; padding: 8px 14px; }
.tab.active { background: var(--card); color: var(--ink); border-color: var(--line); }
.badge { background: var(--bad); color: #fff; border-radius: 99px; font-size: .72rem; padding: 1px 7px; vertical-align: 2px; }

.item { border-top: 1px solid var(--line); padding: 12px 2px; }
.item:first-child { border-top: 0; }
.item .title { font-weight: 600; }
.item .meta { color: var(--muted); font-size: .82rem; }
.item .actions { margin-top: 6px; display: flex; gap: 8px; flex-wrap: wrap; }

.notice { background: var(--accent-soft); border: 1px solid var(--line); border-radius: 10px; padding: 12px; margin: 10px 0; word-break: break-all; }

.matbody { white-space: pre-wrap; background: var(--accent-soft); border-radius: 10px; padding: 14px; margin: 10px 0; }
.readline { margin: 0 0 12px; font-size: 1.08rem; }
.readline:last-child { margin-bottom: 0; }
.readline .ipa { color: var(--accent); font-family: Georgia, "Times New Roman", serif; font-size: .95rem; margin-top: 2px; white-space: normal; }

/* AI panel inside a submission */
.ai-panel { background: #f6f2ea; border: 1px solid #e8dfcd; border-radius: 10px; padding: 12px; margin: 10px 0; }
.ai-panel .score { font-family: Georgia, serif; font-size: 1.3rem; }
.ai-panel ul { margin: 6px 0; padding-left: 20px; }
.chip { display: inline-block; border-radius: 99px; padding: 2px 10px; font-size: .78rem; margin-right: 6px; }
.chip.good { background: #e3f2e8; color: var(--good); }
.chip.warn { background: #fbeee2; color: var(--warn); }
.chip.new { background: #fdeaea; color: var(--bad); }
.chip.grey { background: #eee; color: var(--muted); }
.fix { background: #fff; border-left: 3px solid var(--warn); padding: 6px 10px; margin: 6px 0; border-radius: 0 8px 8px 0; }
.fix .ex { color: var(--bad); text-decoration: line-through; text-decoration-thickness: 1px; }
.fix .ok { color: var(--good); }

.reply-box { background: var(--accent-soft); border-radius: 10px; padding: 12px; margin-top: 10px; }
audio { width: 100%; margin-top: 8px; }
label.chk { display: flex; gap: 8px; align-items: center; margin: 8px 0; color: var(--muted); font-size: .9rem; }
label.chk input { width: auto; margin: 0; }

.modal { position: fixed; inset: 0; background: rgba(20,20,25,.45); display: flex; align-items: center; justify-content: center; z-index: 20; padding: 14px; }
.modal[hidden] { display: none; }
.modal-card.wide { max-width: 920px; }

/* ---- V1 annotation markup (the teaching slide) ---- */
.layerrow { display: flex; flex-wrap: wrap; gap: 2px 14px; margin: 8px 0 4px; }
.layerrow label.chk { margin: 2px 0; font-size: .82rem; }
.slide {
  --sl-bg: #1d3f5e; --sl-content: #ffd94d; --sl-weak: #cfe3f4; --sl-ipa: #bfe0ff;
  --sl-arc: #ffb35c; --sl-glide: #7fd3a8; --sl-bar: #e0a6f0; --sl-arrow: #7fc4ff;
  --sl-nuc: #ff9d5c; --sl-elide: #9fb9d0; --sl-zh: #ffe9a8; --sl-fg: #fff;
  background: var(--sl-bg); color: var(--sl-fg); border-radius: 12px;
  padding: clamp(14px, 3vw, 26px); margin: 10px 0;
  font-size: var(--slide-size, clamp(19px, 2.6vw, 26px));
  line-height: var(--slide-lh, 2.05); overflow-wrap: break-word;
}
.slide.th-dark { --sl-bg: #16161c; }
.slide.th-paper {
  --sl-bg: #ffffff; --sl-fg: #222; --sl-content: #14406e; --sl-weak: #8a8a8a;
  --sl-ipa: #3a6ea5; --sl-arc: #b3691a; --sl-glide: #2c7a4b; --sl-bar: #9b59b6;
  --sl-arrow: #2f7fd0; --sl-nuc: #d06018; --sl-elide: #999; --sl-zh: #7a6420;
  border: 1px solid var(--line);
}
.slide .line { margin: 0 0 12px; }
.slide .line:last-child { margin-bottom: 0; }
.slide ruby { ruby-align: center; }
.slide ruby rt { color: var(--sl-ipa); font-size: calc(var(--ipa-size, .55) * 1em); font-weight: 400; line-height: 1.1; }
.slide .tok { cursor: pointer; }
.slide .tok:hover { filter: brightness(1.28); text-decoration: underline; text-decoration-thickness: 1px; text-underline-offset: 5px; }
.slide .tok.content { color: var(--sl-content); font-weight: 500; }
.slide .tok.content.stress { font-weight: 800; font-size: 1.06em; }
.slide .tok.content.nuc { text-decoration: underline; text-decoration-color: var(--sl-nuc); text-decoration-thickness: 2px; text-underline-offset: 5px; }
.slide .tok.weak { color: var(--sl-weak); font-size: .55em; vertical-align: .32em; font-weight: 400; }
.slide .tok .elide { color: var(--sl-elide); }
.slide .arc { color: var(--sl-arc); font-weight: 700; display: inline-block; transform: translateY(.12em); }
.slide .glide { color: var(--sl-glide); font-size: .5em; vertical-align: .5em; font-weight: 700; margin-left: -.05em; }
.slide .bar { color: var(--sl-bar); margin: 0 .16em; font-size: 1.05em; }
.slide .arrow { color: var(--sl-arrow); font-weight: 800; margin: 0 .05em; font-size: .72em; vertical-align: .2em; }
.slide .ipa { color: var(--sl-ipa); font-size: calc(var(--ipa-size, .55) * 1em); margin-top: 2px; line-height: 1.6; cursor: pointer; }
.slide .ipa::before { content: "🔊 "; font-size: .9em; opacity: .55; }
.slide .zh { color: var(--sl-zh); font-size: .48em; margin-top: 3px; line-height: 1.5; }

/* ---- full-screen studio layout ---- */
.studio { display: grid; grid-template-columns: 290px 1fr; gap: 14px; align-items: start; }
.stside .card { margin: 0 0 12px; padding: 14px; }
.stside h3 { margin-bottom: 6px; }
.stside input[type=range] { margin: 2px 0 8px; }
.stmain { min-width: 0; }
#stOut .slide { margin: 0; }
.studio-top { position: sticky; top: 54px; z-index: 4; background: var(--paper); padding: 8px 0; }
@media (max-width: 760px) { .studio { grid-template-columns: 1fr; } }
.modal-card { background: var(--card); border-radius: var(--radius); padding: 20px; width: 100%; max-width: 480px; max-height: 88vh; overflow: auto; }

.spin { display: inline-block; width: 14px; height: 14px; border: 2px solid var(--line); border-top-color: var(--accent); border-radius: 50%; animation: sp 0.8s linear infinite; vertical-align: -2px; }
@keyframes sp { to { transform: rotate(360deg); } }

@media (max-width: 560px) {
  main#app { padding: 12px 8px; }
  .card { padding: 14px; }
}