:root {
  --ink: #172126;
  --muted: #5e6a70;
  --line: #dce3e7;
  --paper: #f7f8f4;
  --panel: #ffffff;
  --green: #1f7a62;
  --green-soft: #e4f2ec;
  --gold: #b7791f;
  --blue: #28628f;
  --red: #b54747;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--ink);
  background: var(--paper);
}
body.locked .app-shell { filter: blur(3px); pointer-events: none; user-select: none; }
.activation-gate {
  position: fixed; inset: 0; z-index: 1000; display: none; place-items: center;
  background: rgba(247, 248, 244, .84); backdrop-filter: blur(12px); padding: 20px;
}
body.locked .activation-gate { display: grid; }
.activation-box {
  width: min(420px, 100%); background: #fff; border: 1px solid var(--line);
  border-radius: 8px; padding: 24px; box-shadow: 0 20px 60px rgba(23, 33, 38, .16);
}
.activation-box h2 { margin: 0 0 8px; font-size: 24px; }
.activation-box p { margin: 0 0 18px; color: var(--muted); line-height: 1.6; }
.activation-box label { display: grid; gap: 8px; color: var(--muted); font-size: 13px; }
.activation-box input { text-transform: uppercase; letter-spacing: 1px; }
.activation-box button {
  width: 100%; margin-top: 14px; border: 1px solid var(--green); border-radius: 8px;
  background: var(--green); color: #fff; padding: 12px; cursor: pointer; font-weight: 700;
}
.activation-box .activation-error { min-height: 22px; margin: 12px 0 0; color: var(--red); }
button, input, select { font: inherit; }
.app-shell { min-height: 100vh; display: grid; grid-template-columns: 292px 1fr; }
.sidebar {
  position: sticky; top: 0; height: 100vh; overflow-y: auto;
  background: #eef3ef; border-right: 1px solid var(--line); padding: 18px;
}
.brand { display: flex; gap: 12px; align-items: center; margin-bottom: 24px; }
.brand-mark {
  width: 42px; height: 42px; border-radius: 8px; display: grid; place-items: center;
  background: var(--green); color: white; font-weight: 800; font-size: 22px;
}
.brand h1 { font-size: 18px; margin: 0; line-height: 1.25; }
.brand p { margin: 4px 0 0; color: var(--muted); font-size: 13px; }
.course-select {
  display: grid; gap: 6px; color: var(--muted); font-size: 13px; margin-bottom: 16px;
}
.filter-panel {
  background: rgba(255,255,255,.78); border: 1px solid var(--line); border-radius: 8px;
  padding: 16px; margin: 16px 0 18px;
}
.hidden { display: none !important; }
.filter-panel h2 { margin: 0; font-size: 17px; }
.filter-panel p { margin: 4px 0 14px; color: var(--muted); font-size: 13px; }
.filters { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 14px; }
.filters label { display: grid; gap: 6px; color: var(--muted); font-size: 13px; }
.filters label[hidden] { display: none !important; }
.filter-panel.real-mode .filters { grid-template-columns: repeat(4, minmax(0, 1fr)); }
select, input {
  width: 100%; border: 1px solid var(--line); border-radius: 8px; background: white;
  color: var(--ink); padding: 11px 12px; outline: none;
}
.nav-tabs { display: grid; gap: 6px; margin-top: 22px; }
.tab-btn {
  text-align: left; border: 1px solid transparent; border-radius: 8px;
  background: transparent; padding: 11px 12px; cursor: pointer; color: var(--ink);
}
.tab-btn.active, .tab-btn:hover { background: white; border-color: var(--line); }
.tab-btn.parent-active { background: rgba(255,255,255,.55); border-color: #c9d8d0; color: var(--green); }
.nav-parent { margin-top: 8px; font-size: 15px; font-weight: 800; }
.nav-parent:first-child { margin-top: 0; }
.nav-child {
  margin-left: 18px; padding: 8px 10px; font-size: 13px; color: var(--muted);
  border-left: 2px solid #cfdad4; border-radius: 0 8px 8px 0;
}
.nav-child.active, .nav-child:hover { color: var(--green); border-left-color: var(--green); }
.content { min-width: 0; padding: 18px 24px 36px; }
.topbar {
  position: sticky; top: 0; z-index: 4; display: grid; grid-template-columns: auto 1fr;
  gap: 12px; align-items: center; background: rgba(247,248,244,.92); backdrop-filter: blur(10px);
  padding: 0 0 14px;
}
.menu-btn { display: none; }
.icon-btn, .small-btn {
  border: 1px solid var(--line); background: white; border-radius: 8px; cursor: pointer;
}
.icon-btn { width: 42px; height: 42px; }
.search-wrap {
  display: flex; align-items: center; gap: 8px; background: white; border: 1px solid var(--line);
  border-radius: 8px; padding: 0 12px;
}
.search-wrap input { border: 0; padding-left: 0; }
.hero {
  min-height: 360px; display: grid; grid-template-columns: 1.45fr .65fr; gap: 28px; align-items: stretch;
  padding: 28px; border: 1px solid var(--line); border-radius: 8px;
  background:
    linear-gradient(120deg, rgba(255,255,255,.95), rgba(255,255,255,.70)),
    radial-gradient(circle at 78% 28%, rgba(31,122,98,.22), transparent 34%),
    linear-gradient(135deg, #eff6f0, #f6efe4);
}
.hero-main { min-height: 304px; display: flex; flex-direction: column; justify-content: space-between; }
.exam-countdown {
  width: min(280px, 70%); min-height: 150px; position: relative; display: flex;
  align-items: center; justify-content: center; gap: 10px; padding: 16px;
  border: 1px solid var(--line); border-radius: 8px; background: rgba(255,255,255,.86); color: var(--muted);
}
.exam-countdown strong { font-size: 44px; line-height: 1; color: var(--green); }
.exam-countdown span { font-size: 24px; color: var(--muted); }
.exam-countdown p { position: absolute; top: 14px; left: 16px; margin: 0; font-weight: 400; font-size: 15px; color: var(--muted); }
.eyebrow { margin: 0 0 10px; color: var(--green); font-weight: 700; font-size: 13px; }
.hero h2 { margin: 0; font-size: 30px; line-height: 1.22; max-width: 760px; letter-spacing: 0; }
.stats { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; align-content: center; }
.stat { background: rgba(255,255,255,.86); border: 1px solid var(--line); border-radius: 8px; padding: 12px; text-align: left; cursor: pointer; min-height: 74px; }
.stat:hover { border-color: var(--green); }
.stat strong { display: block; font-size: 28px; line-height: 1.1; }
.stat span { color: var(--muted); font-size: 13px; }
.stat.wide { grid-column: 1 / -1; }
.stat.left { grid-column: 1; }
.stat.right { grid-column: 2; }
.stat .stat-bar { display: block; height: 9px; margin-top: 9px; border-radius: 999px; background: #e8eeea; overflow: hidden; }
.stat .stat-fill { display: block; height: 100%; border-radius: inherit; background: var(--green); }
.stat.action { min-height: 74px; background: var(--green); color: white; border-color: var(--green); display: flex; align-items: center; justify-content: center; }
.stat.action span, .stat.action strong { color: white; }
.stat.action strong, .stat.secondary strong { font-size: 20px; }
.stat.action span { display: none; }
.stat.secondary { min-height: 74px; background: var(--green-soft); border-color: #b7d8c8; display: flex; align-items: center; justify-content: center; }
.stat.secondary span { display: none; }
.result-head { display: flex; justify-content: space-between; gap: 16px; align-items: center; margin: 24px 0 12px; }
.result-head h2 { margin: 0; font-size: 22px; }
.result-head p { margin: 5px 0 0; color: var(--muted); }
.content-list { display: grid; gap: 14px; }
.group-title { margin: 22px 0 2px; font-size: 18px; color: var(--green); }
.card {
  background: var(--panel); border: 1px solid var(--line); border-radius: 8px; padding: 16px;
}
.card-top { display: flex; justify-content: space-between; gap: 12px; align-items: flex-start; }
.card h3 { margin: 0; font-size: 18px; line-height: 1.38; }
.meta { display: flex; flex-wrap: wrap; gap: 7px; margin: 10px 0; }
.tag {
  display: inline-flex; align-items: center; min-height: 26px; border-radius: 999px;
  background: #edf3f1; color: var(--green); padding: 4px 9px; font-size: 12px;
}
.tag.type-noun { background: #eef4ff; color: #2456a6; }
.tag.type-short { background: #fff3db; color: #9a5b00; }
.tag.type-essay { background: #f4e9ff; color: #6f3aa7; }
.tag.real { background: #f8e8e8; color: var(--red); }
.tag.review-wait { background: #f2f5f4; color: var(--muted); }
.tag.review-due { background: #ffe7e7; color: var(--red); border: 1px solid #f1b7b7; }
.actions { display: flex; gap: 8px; flex-wrap: wrap; justify-content: flex-end; }
.small-btn { padding: 8px 10px; white-space: nowrap; }
.small-btn.active { background: var(--green-soft); border-color: var(--green); color: var(--green); }
.answer { display: none; white-space: pre-wrap; color: #263238; line-height: 1.78; border-top: 1px solid var(--line); margin-top: 12px; padding-top: 12px; }
.answer.open { display: block; }
.answer-media { display: none; gap: 12px; margin-top: 14px; white-space: normal; }
.knowledge-summary.open + .answer-media, .answer .answer-media { display: grid; }
.answer-media figure { margin: 0; }
.answer-media img {
  display: block; max-width: 100%; height: auto; border: 1px solid var(--line);
  border-radius: 8px; background: white;
}
.answer-media.inline-small {
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  max-width: 980px;
}
.answer-media.inline-small img {
  width: 100%;
  max-height: 260px;
  object-fit: contain;
}
.answer-section {
  padding: 0 0 14px;
  margin: 0 0 14px;
  border-bottom: 1px solid var(--line);
}
.answer-section:last-child {
  border-bottom: 0;
  margin-bottom: 0;
  padding-bottom: 0;
}
.answer-section h4 {
  margin: 0 0 8px;
  font-size: 16px;
  line-height: 1.35;
}
.answer-section h4 span {
  margin-left: 6px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 600;
}
.summary { color: var(--muted); line-height: 1.7; margin: 10px 0 0; }
.knowledge-summary {
  color: #334247; line-height: 1.72; margin-top: 10px; white-space: pre-wrap;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
}
.knowledge-summary.open { display: block; overflow: visible; }
.link-btn { border: 0; background: transparent; color: var(--green); padding: 8px 0 0; cursor: pointer; font-weight: 700; }
.chapter-progress {
  background: white; border: 1px solid var(--line); border-radius: 8px; padding: 14px; margin: 0 0 16px;
}
.chapter-progress.hidden { display: none; }
.chapter-progress h3 { margin: 0 0 12px; font-size: 17px; }
.progress-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 10px; }
.progress-row {
  display: grid; grid-template-columns: 1fr auto; gap: 8px 10px;
  align-items: center; border: 1px solid var(--line); border-radius: 8px; padding: 10px; background: #fbfcfa; cursor: pointer;
}
.progress-row:hover { border-color: var(--green); }
.progress-title { grid-column: 1 / -1; font-size: 13px; color: var(--ink); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.progress-track { height: 9px; border-radius: 999px; background: #e7ece8; overflow: hidden; }
.progress-fill { display: block; width: 100%; height: 100%; background: var(--green); border-radius: inherit; transform-origin: left center; }
.progress-count { color: var(--muted); font-size: 13px; text-align: right; }
.progress-toggle { margin-top: 10px; border: 1px solid var(--line); background: #fff; border-radius: 8px; padding: 8px 12px; cursor: pointer; }
.mindmap-visual { width: 100%; overflow-x: auto; padding: 10px 0; }
.mindmap-svg { min-width: 980px; width: 100%; height: auto; }
.mindmap-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 14px; }
.mindmap-thumb {
  min-height: 218px; max-height: 218px; border: 1px solid var(--line); border-radius: 8px; background: #fff;
  padding: 14px; text-align: left; cursor: pointer; display: grid; grid-template-rows: auto auto 1fr; gap: 7px;
}
.mindmap-thumb:hover, .mindmap-thumb.active { border-color: var(--green); box-shadow: 0 8px 24px rgba(23,33,38,.08); }
.mindmap-thumb strong { font-size: 15px; line-height: 1.35; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.mindmap-thumb span { color: var(--green); font-size: 12px; }
.thumb-lines { display: grid; gap: 5px; align-content: start; overflow: hidden; max-height: 132px; }
.thumb-lines i {
  display: block; color: #52656c; font-size: 12px; font-style: normal; overflow: hidden;
  text-overflow: ellipsis; white-space: nowrap; border-left: 2px solid #c8d8cf; padding-left: 7px;
}
.mindmap-detail { border-color: #b7d8c8; }
.map-line { fill: none; stroke: #b7c8bf; stroke-width: 2; }
.map-node rect { fill: #ffffff; stroke: #bfd2c8; stroke-width: 1.5; rx: 8; }
.map-node.root rect { fill: var(--green); stroke: var(--green); }
.map-node.section rect { fill: #eef6f1; }
.map-node text { fill: var(--ink); font-size: 13px; dominant-baseline: middle; }
.map-node.root text { fill: #fff; font-weight: 700; }
.empty { text-align: center; color: var(--muted); padding: 40px 10px; }
.backdrop { display: none; }
.home-grid { display: grid; grid-template-columns: 1.35fr .65fr; gap: 16px; }
.home-intro, .login-card, .feature-card, .subject-card, .ai-card, .plan-block, .check-card, .metric-card, .calendar-card {
  background: var(--panel); border: 1px solid var(--line); border-radius: 8px; padding: 18px;
}
.home-intro {
  min-height: 310px; display: flex; flex-direction: column; justify-content: center;
  background: linear-gradient(120deg, rgba(255,255,255,.94), rgba(255,255,255,.72)), linear-gradient(135deg, #eef6f1, #f7efe2);
}
.home-intro h2 { margin: 0; max-width: 720px; font-size: 32px; line-height: 1.2; }
.home-intro p, .login-card p, .feature-card p, .ai-card p, .phase p, .check-card p { color: var(--muted); line-height: 1.7; }
.home-actions, .form-actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 16px; }
.primary-btn, .ghost-btn {
  border: 1px solid var(--green); border-radius: 8px; padding: 11px 14px; cursor: pointer; font-weight: 700;
}
.primary-btn { background: var(--green); color: #fff; }
.ghost-btn { background: #fff; color: var(--green); }
.login-card { display: grid; align-content: center; gap: 12px; }
.login-card h3, .feature-card h3, .subject-card h3, .ai-card h3, .plan-block h3, .check-card h3 { margin: 0; }
.login-card label, .subject-card label, .lead-box label, .check-card label, .model-settings label {
  display: grid; gap: 6px; color: var(--muted); font-size: 13px;
}
.rule-preview {
  margin: 0; border-top: 1px solid var(--line); padding-top: 10px; color: var(--muted); line-height: 1.6;
}
.rule-preview strong, .rule-preview span { display: block; }
.rule-preview strong { color: var(--green); }
.feature-grid, .subject-grid, .analytics-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 14px; margin-top: 14px; }
.section-list { display: grid; gap: 12px; margin-top: 14px; }
.section-card {
  display: grid; grid-template-columns: 42px 1fr auto; gap: 14px; align-items: center;
  background: var(--panel); border: 1px solid var(--line); border-radius: 8px; padding: 16px;
}
.section-index {
  width: 34px; height: 34px; border-radius: 50%; display: grid; place-items: center;
  background: var(--green-soft); color: var(--green); font-weight: 800;
}
.section-card h3 { margin: 0; font-size: 17px; }
.section-card p { margin: 5px 0 0; color: var(--muted); line-height: 1.6; }
.model-form, .plan-stack { display: grid; gap: 14px; }
.model-settings {
  display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 14px;
  background: var(--panel); border: 1px solid var(--line); border-radius: 8px; padding: 16px;
}
.step-line {
  display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 8px;
  color: var(--muted); font-size: 13px;
}
.step-line span { border: 1px solid var(--line); border-radius: 8px; background: #fff; padding: 10px; text-align: center; }
.step-line .active { color: var(--green); border-color: #b7d8c8; background: var(--green-soft); }
.subject-card { display: grid; gap: 12px; }
.ai-card { max-width: 900px; }
.soft-lead { margin-top: 14px; font-size: 14px; }
.inline-lead {
  border: 0; border-bottom: 1px solid #b7d8c8; background: transparent; color: var(--green);
  padding: 0 1px; cursor: pointer;
}
.lead-box { display: grid; grid-template-columns: 1fr auto; gap: 10px; align-items: end; margin-top: 12px; }
.phase-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px; }
.phase { border: 1px solid var(--line); border-radius: 8px; padding: 12px; background: #fbfcfa; }
.phase strong, .phase span { display: block; }
.phase span { color: var(--green); margin-top: 4px; font-size: 13px; }
.availability-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 10px; margin-top: 12px; }
.availability-grid span {
  border: 1px solid var(--line); border-radius: 8px; padding: 10px 12px; background: #fbfcfa;
  color: var(--muted); font-size: 13px;
}
.availability-grid strong { display: block; color: var(--green); margin-top: 4px; font-size: 18px; }
.plan-summary-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; margin-top: 12px; }
.plan-summary-grid div { border: 1px solid var(--line); border-radius: 8px; padding: 12px; background: #fbfcfa; }
.plan-summary-grid strong, .plan-summary-grid span { display: block; }
.plan-summary-grid span { margin-top: 4px; color: var(--green); font-size: 13px; }
.plan-summary-grid p { margin: 8px 0 0; color: var(--muted); line-height: 1.65; }
.adjust-list { display: grid; gap: 10px; margin-top: 12px; }
.adjust-row {
  display: grid; grid-template-columns: 120px 120px 1fr; gap: 12px; align-items: end;
  border-top: 1px solid var(--line); padding-top: 10px;
}
.adjust-row:first-child { border-top: 0; padding-top: 0; }
.adjust-row label { display: grid; gap: 6px; color: var(--muted); font-size: 13px; }
.plan-row, .share-row {
  display: grid; grid-template-columns: 150px 1fr; gap: 12px; align-items: center;
  border-top: 1px solid var(--line); padding: 11px 0;
}
.plan-row:first-of-type, .share-row:first-of-type { border-top: 0; }
.plan-row strong, .share-row strong { color: var(--muted); font-size: 14px; text-align: right; }
.weekly-row {
  display: grid; grid-template-columns: 220px 1fr 56px; gap: 12px; align-items: center;
  border-top: 1px solid var(--line); padding: 12px 0;
}
.weekly-row:first-of-type { border-top: 0; }
.weekly-row span, .weekly-row strong { display: block; }
.weekly-row strong { margin-top: 4px; color: var(--muted); font-size: 13px; font-weight: 600; }
.weekly-row em { color: var(--green); font-style: normal; font-weight: 800; text-align: right; }
.weekly-track { height: 10px; border-radius: 999px; background: #e8eeea; overflow: hidden; }
.weekly-track i { display: block; height: 100%; border-radius: inherit; background: var(--green); }
.todo-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 9px; }
.todo-list li { display: grid; grid-template-columns: 34px 1fr; gap: 10px; align-items: center; }
.todo-list button, .check-dot {
  width: 34px; height: 34px; border-radius: 8px; border: 1px solid var(--line); background: #fff; color: var(--green);
  cursor: pointer; font-weight: 800;
}
.todo-list button.done, .check-card.done .check-dot { background: var(--green); border-color: var(--green); color: #fff; }
.checkin-layout { display: grid; grid-template-columns: minmax(360px, 520px) 1fr; gap: 18px; align-items: start; }
.checkin-grid { display: grid; grid-template-columns: 1fr; gap: 14px; }
.check-card { display: grid; grid-template-columns: 42px 1fr 120px; gap: 12px; align-items: center; }
.check-card.done { border-color: #b7d8c8; background: #fbfffd; }
.calendar-card { max-width: 520px; margin-bottom: 0; }
.calendar-head {
  display: grid; grid-template-columns: 42px 1fr 42px; gap: 8px; align-items: center; margin-bottom: 12px;
}
.calendar-head h3 { margin: 0; text-align: center; font-size: 18px; }
.calendar-weekdays, .calendar-grid { display: grid; grid-template-columns: repeat(7, 1fr); gap: 8px; }
.calendar-weekdays { color: var(--muted); font-size: 12px; text-align: center; margin-bottom: 8px; }
.calendar-day {
  width: 42px; height: 42px; border-radius: 50%; justify-self: center;
  border: 1px solid transparent; background: #eef2f4; color: #53616a; cursor: pointer;
  display: grid; place-items: center; align-content: center; padding: 0;
}
.calendar-day b { font-size: 13px; line-height: 1; }
.calendar-day small { display: block; font-size: 9px; line-height: 1; margin-top: 2px; }
.calendar-day.done { background: #d9eee4; color: var(--green); }
.calendar-day.partial { background: #fff3db; color: #9a5b00; }
.calendar-day.missed { background: #f9e7e7; color: var(--red); }
.calendar-day.future { background: #eef2f4; color: #9aa6ad; }
.calendar-day.today { border-color: #172126; box-shadow: inset 0 0 0 2px #fff; }
.calendar-day.selected { outline: 2px solid var(--green); outline-offset: 2px; }
.calendar-day.outside { background: transparent; border: 0; cursor: default; }
.calendar-legend { display: flex; gap: 16px; color: var(--muted); font-size: 13px; margin-top: 12px; }
.calendar-legend span { display: inline-flex; gap: 6px; align-items: center; }
.calendar-legend i { width: 12px; height: 12px; border-radius: 50%; display: inline-block; }
.calendar-legend i.done { background: #d9eee4; }
.calendar-legend i.partial { background: #fff3db; }
.calendar-legend i.missed { background: #f9e7e7; }
.metric-card strong { display: block; font-size: 34px; color: var(--green); }
.metric-card span { color: var(--muted); }
.share-row { grid-template-columns: 120px 1fr 120px; }
.share-track { height: 12px; border-radius: 999px; background: #e8eeea; overflow: hidden; }
.share-track i { display: block; height: 100%; border-radius: inherit; }
@media (max-width: 820px) {
  .app-shell { grid-template-columns: 1fr; }
  .sidebar {
    position: fixed; z-index: 10; width: 84vw; max-width: 320px; transform: translateX(-105%);
    transition: transform .2s ease; box-shadow: 18px 0 40px rgba(23,33,38,.18);
  }
  .sidebar.open { transform: translateX(0); }
  .backdrop.open { display: block; position: fixed; inset: 0; z-index: 9; background: rgba(0,0,0,.28); }
  .content { padding: 12px 14px 28px; }
  .menu-btn { display: inline-grid; place-items: center; }
  .topbar { grid-template-columns: auto 1fr; }
  .hero { grid-template-columns: 1fr; min-height: 0; padding: 18px; }
  .hero-main { min-height: 260px; }
  .exam-countdown { width: 100%; }
  .hero h2 { font-size: 22px; }
  .stats { grid-template-columns: repeat(2, minmax(0,1fr)); }
  .filters { grid-template-columns: 1fr; }
  .progress-grid { grid-template-columns: 1fr; }
  .progress-row { grid-template-columns: 1fr auto; gap: 6px; }
  .progress-count { text-align: left; }
  .result-head { align-items: stretch; flex-direction: column; }
  .card-top { flex-direction: column; }
  .actions { justify-content: flex-start; }
  .home-grid, .feature-grid, .subject-grid, .analytics-grid, .phase-grid, .checkin-grid, .checkin-layout, .model-settings, .availability-grid, .plan-summary-grid { grid-template-columns: 1fr; }
  .mindmap-grid { grid-template-columns: 1fr 1fr; }
  .home-intro { min-height: 260px; }
  .home-intro h2 { font-size: 24px; }
  .step-line { grid-template-columns: 1fr 1fr; }
  .lead-box, .check-card, .plan-row, .share-row, .adjust-row, .weekly-row { grid-template-columns: 1fr; }
  .section-card { grid-template-columns: 1fr; }
  .plan-row strong, .share-row strong, .weekly-row em { text-align: left; }
  .calendar-card { max-width: none; }
  .calendar-weekdays, .calendar-grid { gap: 6px; }
  .calendar-day { width: 36px; height: 36px; }
}