:root {
  --ink: #17283f;
  --muted: #7d8da5;
  --blue: #2c71e8;
  --blue-deep: #1555be;
  --blue-soft: #eaf3ff;
  --cyan: #36c7d7;
  --orange: #ff9b62;
  --orange-soft: #fff0e9;
  --green: #36ba8b;
  --green-soft: #e8fbf4;
  --purple: #896cf2;
  --purple-soft: #f0edff;
  --line: #e8eef6;
  --card: #ffffff;
  --bg: #f7faff;
  --shadow: 0 12px 30px rgba(35, 84, 148, .08);
  font-family: "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  color: var(--ink);
  background: var(--bg);
  font-synthesis: none;
}

* { box-sizing: border-box; }
body { margin: 0; background: #edf4fc; color: var(--ink); }
button { font: inherit; color: inherit; cursor: pointer; border: 0; }
#app-shell { min-height: 100vh; max-width: 1180px; margin: 0 auto; background: var(--bg); }
.topbar { height: 76px; display: flex; align-items: center; justify-content: space-between; padding: 0 28px; background: rgba(247,250,255,.92); position: sticky; top: 0; z-index: 10; backdrop-filter: blur(16px); }
.brand-lockup { display: flex; align-items: center; gap: 11px; }
.brand-mark { width: 38px; height: 38px; display: grid; place-items: center; border-radius: 13px; color: #fff; font-size: 19px; font-weight: 800; background: linear-gradient(145deg, #4e9cff, #2762dd); box-shadow: 0 8px 16px rgba(44,113,232,.22); }
.brand-name { font-size: 17px; font-weight: 800; letter-spacing: 1px; }
.brand-subtitle { color: var(--muted); font-size: 11px; margin-top: 2px; }
.icon-button { width: 38px; height: 38px; background: transparent; position: relative; display: grid; place-items: center; }
.notification-button i { position: absolute; top: 7px; right: 6px; width: 6px; height: 6px; border-radius: 50%; background: #ff7e68; border: 2px solid var(--bg); }
.icon, .nav-icon { display: inline-block; position: relative; width: 20px; height: 20px; }
.icon::before, .icon::after, .nav-icon::before, .nav-icon::after { content: ""; position: absolute; }
.icon-bell::before { left: 5px; top: 3px; width: 10px; height: 12px; border: 1.8px solid currentColor; border-radius: 7px 7px 4px 4px; }
.icon-bell::after { left: 3px; top: 15px; width: 14px; height: 2px; border-radius: 2px; background: currentColor; }
.icon-home::before { left: 3px; top: 7px; width: 13px; height: 10px; border: 1.7px solid currentColor; border-radius: 3px; }
.icon-home::after { left: 3px; top: 3px; width: 11px; height: 11px; border-left: 1.7px solid currentColor; border-top: 1.7px solid currentColor; transform: rotate(45deg); border-radius: 2px; }
.icon-book::before { left: 3px; top: 2px; width: 13px; height: 16px; border: 1.7px solid currentColor; border-radius: 3px; }
.icon-book::after { left: 7px; top: 5px; width: 6px; height: 1.7px; background: currentColor; box-shadow: 0 4px currentColor; }
.icon-mistake::before { left: 3px; top: 2px; width: 14px; height: 16px; border: 1.7px solid currentColor; border-radius: 4px; }
.icon-mistake::after { content: "!"; left: 8px; top: 2px; font-weight: 800; font-size: 13px; }
.icon-user::before { left: 6px; top: 2px; width: 7px; height: 7px; border: 1.7px solid currentColor; border-radius: 50%; }
.icon-user::after { left: 3px; bottom: 2px; width: 13px; height: 8px; border: 1.7px solid currentColor; border-radius: 9px 9px 4px 4px; }
.main-content { padding: 24px 28px 110px; }
.page-heading { display: flex; align-items: flex-start; justify-content: space-between; gap: 16px; margin: 7px 0 22px; }
.eyebrow { color: var(--blue); font-size: 13px; font-weight: 700; margin: 0 0 8px; }
h1, h2, h3, p { margin: 0; }
h1 { font-size: clamp(24px, 3vw, 32px); letter-spacing: -.6px; line-height: 1.18; }
h2 { font-size: 19px; letter-spacing: -.25px; }
h3 { font-size: 15px; }
.page-note { color: var(--muted); font-size: 13px; margin-top: 9px; }
.grade-switch { display: inline-flex; align-items: center; gap: 6px; border: 1px solid var(--line); background: var(--card); border-radius: 11px; padding: 9px 11px; color: var(--blue-deep); font-size: 12px; white-space: nowrap; box-shadow: var(--shadow); }
.grade-switch span { color: var(--muted); font-size: 10px; font-weight: 700; }
.grade-switch strong { font-size: 12px; }
.grade-switch i { color: var(--blue); font-style: normal; font-size: 13px; }
.grid { display: grid; gap: 16px; }
.home-grid { grid-template-columns: 1.32fr .88fr; align-items: start; }
.card { background: var(--card); border: 1px solid rgba(227,235,246,.8); border-radius: 20px; box-shadow: var(--shadow); }
.hero-card { position: relative; overflow: hidden; padding: 24px; min-height: 222px; background: linear-gradient(128deg, #2978e9 0%, #5ca1ff 100%); color: #fff; border: none; }
.hero-card::after { content: ""; position: absolute; width: 190px; height: 190px; right: -32px; top: -45px; border: 1px solid rgba(255,255,255,.22); border-radius: 50%; box-shadow: 0 0 0 22px rgba(255,255,255,.06), 0 0 0 48px rgba(255,255,255,.04); }
.hero-card h2 { max-width: 330px; font-size: 24px; line-height: 1.35; position: relative; z-index: 1; }
.hero-card .hero-caption { color: rgba(255,255,255,.8); font-size: 13px; margin-top: 10px; position: relative; z-index: 1; }
.hero-stats { display: flex; gap: 28px; margin-top: 25px; position: relative; z-index: 1; }
.hero-stat strong { display: block; font-size: 23px; }
.hero-stat span { display: block; color: rgba(255,255,255,.75); font-size: 11px; margin-top: 3px; }
.hero-action { position: absolute; right: 23px; bottom: 22px; z-index: 1; background: #fff; color: var(--blue-deep); border-radius: 11px; padding: 10px 15px; font-size: 12px; font-weight: 800; }
.streak-card { padding: 19px 20px; }
.streak-head, .section-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.streak-head span, .section-link { color: var(--blue); font-size: 12px; font-weight: 700; }
.streak-number { margin: 17px 0 13px; display: flex; align-items: baseline; gap: 7px; }
.streak-number strong { font-size: 38px; line-height: 1; }
.streak-number span { color: var(--muted); font-size: 12px; }
.week-dots { display: flex; justify-content: space-between; gap: 5px; }
.week-dot { display: flex; flex-direction: column; align-items: center; gap: 7px; color: var(--muted); font-size: 10px; }
.week-dot b { display: grid; place-items: center; width: 26px; height: 26px; border-radius: 50%; font-size: 11px; font-weight: 700; background: #f3f6fa; color: #a9b6c7; }
.week-dot.is-done b { color: #fff; background: var(--cyan); }
.section-block { margin-top: 25px; }
.recommend-card { padding: 15px; display: flex; align-items: center; gap: 14px; margin-top: 13px; border-radius: 16px; transition: transform .2s, box-shadow .2s; }
.recommend-card:hover, .subject-card:hover, .paper-card:hover { transform: translateY(-2px); box-shadow: 0 14px 26px rgba(35,84,148,.12); }
.subject-icon { flex: 0 0 45px; height: 45px; display: grid; place-items: center; border-radius: 14px; font-weight: 800; font-size: 17px; }
.math { color: #2774e6; background: var(--blue-soft); } .chinese { color: #f28b53; background: #fff0e4; } .english { color: #37a99c; background: #e8faf7; } .biology { color: #42a873; background: #e9f9ee; } .geography { color: #4f98b5; background: #e8f7fb; } .civics { color: #9b7a45; background: #fff6e1; } .physics { color: #8068e8; background: var(--purple-soft); } .chemistry { color: #eb6c84; background: #ffedf1; } .history { color: #be8a3c; background: #fff7df; }
.recommend-copy { flex: 1; min-width: 0; }
.recommend-copy h3 { font-size: 14px; }
.recommend-copy p { color: var(--muted); font-size: 12px; margin-top: 5px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.progress-bar { height: 5px; overflow: hidden; border-radius: 6px; background: #edf1f6; margin-top: 11px; }
.progress-bar i { display: block; height: 100%; border-radius: inherit; background: var(--blue); }
.recommend-meta { color: var(--muted); font-size: 11px; white-space: nowrap; align-self: flex-start; }
.subjects-card { padding: 20px; }
.subject-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 11px; margin-top: 15px; }
.subject-card { min-height: 105px; border: 1px solid var(--line); background: #fff; border-radius: 15px; text-align: left; padding: 13px; transition: transform .2s, box-shadow .2s; }
.subject-card .subject-icon { width: 34px; height: 34px; border-radius: 10px; font-size: 14px; }
.subject-card strong { display: block; font-size: 13px; margin-top: 9px; }
.subject-card span { display: block; font-size: 10px; color: var(--muted); margin-top: 3px; }
.small-progress { margin-top: 10px; }
.small-progress i { background: var(--green); }
.quick-card { padding: 19px; margin-top: 16px; }
.quick-row { display: flex; gap: 10px; margin-top: 14px; }
.quick-action { flex: 1; padding: 13px 8px; border-radius: 13px; background: #f6f9fd; text-align: center; color: var(--blue-deep); font-size: 12px; font-weight: 700; }
.quick-action .mini-symbol { display: block; font-size: 20px; margin-bottom: 7px; }
.bottom-nav { height: 76px; position: fixed; bottom: 0; left: 50%; transform: translateX(-50%); width: min(1180px, 100%); display: flex; justify-content: space-around; align-items: center; padding: 7px 12px max(7px, env(safe-area-inset-bottom)); background: rgba(255,255,255,.94); border-top: 1px solid var(--line); backdrop-filter: blur(17px); z-index: 20; }
.nav-item { min-width: 74px; height: 58px; border-radius: 15px; background: transparent; display: flex; position: relative; flex-direction: column; justify-content: center; align-items: center; gap: 4px; color: #9aa8ba; font-size: 11px; font-weight: 600; }
.nav-item.is-active { color: var(--blue); background: var(--blue-soft); }
.nav-item b { position: absolute; top: 5px; right: 14px; display: grid; place-items: center; width: 16px; height: 16px; border-radius: 50%; background: #ff7967; color: #fff; font-size: 9px; }
.nav-icon { width: 19px; height: 19px; }
.nav-item.is-active .nav-icon { transform: translateY(-1px); }
.toast { position: fixed; left: 50%; bottom: 92px; transform: translate(-50%, 14px); padding: 10px 14px; border-radius: 11px; background: rgba(23,40,63,.92); color: #fff; font-size: 12px; opacity: 0; pointer-events: none; transition: .25s; z-index: 50; white-space: nowrap; }
.toast.show { opacity: 1; transform: translate(-50%, 0); }
.filter-row { display: flex; align-items: center; gap: 9px; overflow-x: auto; padding-bottom: 3px; scrollbar-width: none; }
.filter-row::-webkit-scrollbar { display: none; }
.filter-pill { flex: 0 0 auto; background: #fff; border: 1px solid var(--line); color: var(--muted); border-radius: 10px; padding: 8px 13px; font-size: 12px; font-weight: 700; }
.filter-pill.is-active { color: #fff; background: var(--blue); border-color: var(--blue); box-shadow: 0 7px 14px rgba(44,113,232,.18); }
.practice-banner { padding: 20px; display: flex; align-items: center; justify-content: space-between; gap: 18px; background: linear-gradient(135deg, #eff7ff, #f4f8ff); border-color: #dceaff; margin-top: 18px; }
.practice-banner p { color: #6e829f; font-size: 12px; margin-top: 7px; line-height: 1.6; }
.banner-emblem { width: 66px; height: 66px; flex: 0 0 auto; display: grid; place-items: center; border-radius: 22px; background: #dcecff; font-size: 32px; }
.tab-row { display: flex; gap: 22px; border-bottom: 1px solid var(--line); margin-top: 25px; }
.tab-button { background: transparent; padding: 0 0 13px; color: var(--muted); font-size: 13px; font-weight: 700; position: relative; }
.tab-button.is-active { color: var(--blue); }
.tab-button.is-active::after { content: ""; position: absolute; bottom: -1px; left: 0; right: 0; height: 3px; background: var(--blue); border-radius: 5px; }
.paper-list { margin-top: 15px; display: grid; gap: 12px; }
.paper-card { padding: 17px 18px; display: flex; align-items: center; gap: 14px; transition: transform .2s, box-shadow .2s; }
.paper-main { flex: 1; min-width: 0; }
.paper-main h3 { font-size: 14px; line-height: 1.4; }
.paper-main p { color: var(--muted); font-size: 11px; margin-top: 6px; }
.paper-tags { display: flex; gap: 6px; margin-top: 10px; }
.tag { display: inline-flex; padding: 4px 7px; border-radius: 6px; background: #f3f6fa; color: #74859c; font-size: 10px; }
.tag.blue { background: var(--blue-soft); color: var(--blue); } .tag.orange { background: var(--orange-soft); color: #e77b40; } .tag.purple { background: var(--purple-soft); color: #7760d9; }
.paper-arrow { color: #b4c1d0; font-size: 20px; }
.mistake-top { display: grid; grid-template-columns: 1fr 1.35fr; gap: 16px; margin-top: 8px; }
.score-card { padding: 21px; background: linear-gradient(145deg, #fff4ee, #fff); border-color: #ffe4d5; }
.score-card p { color: var(--muted); font-size: 12px; }
.score-value { display: flex; align-items: baseline; gap: 5px; margin-top: 13px; }
.score-value strong { font-size: 38px; color: #ef8c58; }
.score-value span { color: var(--muted); font-size: 11px; }
.score-card .progress-bar { margin-top: 14px; } .score-card .progress-bar i { background: var(--orange); }
.score-foot { display: flex; justify-content: space-between; color: var(--muted); font-size: 10px; margin-top: 9px; }
.weak-card { padding: 21px; }
.weak-lines { display: grid; gap: 12px; margin-top: 16px; }
.weak-line { display: grid; grid-template-columns: 50px 1fr 38px; align-items: center; gap: 8px; font-size: 11px; }
.weak-line > span:first-child { color: #677b95; }
.weak-line .progress-bar { margin-top: 0; height: 7px; } .weak-line .progress-bar i { background: var(--purple); }
.weak-line em { color: var(--purple); font-style: normal; text-align: right; font-weight: 800; }
.mistake-section { margin-top: 26px; }
.mistake-filters { margin-top: 13px; }
.mistake-list { display: grid; gap: 11px; margin-top: 13px; }
.mistake-item { padding: 16px 17px; display: flex; gap: 12px; align-items: flex-start; }
.mistake-status { width: 8px; height: 8px; background: #ff8a68; border-radius: 50%; margin-top: 5px; flex: 0 0 auto; }
.mistake-item-main { flex: 1; min-width: 0; }
.mistake-item h3 { font-size: 13px; line-height: 1.5; font-weight: 700; }
.mistake-item p { color: var(--muted); font-size: 11px; margin-top: 7px; }
.mistake-item .section-link { margin-top: 9px; display: inline-block; }
.profile-hero { padding: 23px; display: flex; align-items: center; gap: 16px; background: linear-gradient(135deg, #eaf3ff, #f5f8ff); border-color: #dceaff; }
.avatar { width: 59px; height: 59px; display: grid; place-items: center; border-radius: 19px; background: #4e92f6; color: #fff; font-weight: 800; font-size: 22px; }
.profile-hero h2 { font-size: 19px; } .profile-hero p { color: var(--muted); font-size: 12px; margin-top: 6px; }
.profile-hero .edit-profile { margin-left: auto; background: #fff; color: var(--blue); border-radius: 9px; padding: 8px 11px; font-size: 11px; font-weight: 700; }
.profile-stats { display: grid; grid-template-columns: repeat(3,1fr); margin-top: 15px; padding: 16px 8px; }
.profile-stat { text-align: center; border-right: 1px solid var(--line); } .profile-stat:last-child { border: 0; }
.profile-stat strong { font-size: 19px; display: block; } .profile-stat span { color: var(--muted); font-size: 10px; display: block; margin-top: 5px; }
.settings-list { margin-top: 16px; overflow: hidden; }
.setting-row { min-height: 58px; display: flex; align-items: center; gap: 13px; padding: 0 18px; border-bottom: 1px solid var(--line); }
.setting-row:last-child { border-bottom: 0; }
.setting-row .setting-symbol { width: 30px; height: 30px; display: grid; place-items: center; border-radius: 9px; background: var(--blue-soft); color: var(--blue); font-size: 16px; }
.setting-row p { flex: 1; font-size: 13px; font-weight: 700; } .setting-row small { display: block; color: var(--muted); font-size: 10px; font-weight: 400; margin-top: 3px; }
.chevron { color: #afbdcd; font-size: 18px; }
.install-card { margin-top: 16px; padding: 19px; display: flex; align-items: center; gap: 13px; background: #142944; color: #fff; border: 0; }
.install-card .setting-symbol { width: 36px; height: 36px; border-radius: 11px; background: rgba(255,255,255,.12); font-size: 18px; }
.install-card p { flex: 1; font-weight: 700; font-size: 13px; } .install-card small { display: block; color: #a8c1df; font-size: 10px; font-weight: 400; margin-top: 4px; }
.install-card button { background: #6ca9ff; color: #fff; font-size: 11px; font-weight: 800; border-radius: 9px; padding: 8px 10px; }
.quiz-shell { max-width: 760px; margin: 0 auto; }
.quiz-top { display: flex; align-items: center; gap: 14px; }
.back-button { width: 34px; height: 34px; border-radius: 10px; background: #fff; color: var(--blue); font-size: 20px; }
.quiz-progress { flex: 1; height: 7px; border-radius: 6px; overflow: hidden; background: #dfe8f2; }
.quiz-progress i { display: block; width: 30%; height: 100%; background: var(--blue); border-radius: inherit; }
.quiz-count { color: var(--muted); font-size: 11px; white-space: nowrap; }
.quiz-card { padding: 24px; margin-top: 19px; }
.quiz-label { display: flex; align-items: center; gap: 8px; color: var(--blue); font-size: 12px; font-weight: 800; }
.quiz-label b { padding: 4px 7px; border-radius: 6px; background: var(--blue-soft); }
.quiz-title { font-size: 18px; line-height: 1.65; margin-top: 18px; }
.question-image { margin-top: 17px; height: 102px; display: grid; place-items: center; border-radius: 13px; background: #f7f9fc; border: 1px dashed #cfdae8; color: #8ea0b7; font-size: 12px; }
.options { display: grid; gap: 10px; margin-top: 20px; }
.option { display: flex; gap: 11px; align-items: center; width: 100%; text-align: left; background: #fff; border: 1px solid var(--line); border-radius: 12px; padding: 13px; font-size: 13px; line-height: 1.45; }
.option-key { width: 24px; height: 24px; display: grid; place-items: center; border-radius: 50%; border: 1px solid #dbe4ee; color: #8191a6; font-size: 11px; font-weight: 800; flex: 0 0 auto; }
.option.is-selected { color: var(--blue-deep); border-color: #72a7f4; background: var(--blue-soft); } .option.is-selected .option-key { color: #fff; border-color: var(--blue); background: var(--blue); }
.option.is-correct { color: #118360; border-color: #8bd8bb; background: var(--green-soft); } .option.is-correct .option-key { color: #fff; border-color: var(--green); background: var(--green); }
.option.is-wrong { color: #c9635d; border-color: #f1b6b0; background: #fff4f2; } .option.is-wrong .option-key { color: #fff; border-color: #df7f76; background: #df7f76; }
.quiz-actions { display: flex; justify-content: flex-end; gap: 9px; margin-top: 20px; }
.primary-button, .secondary-button { border-radius: 11px; padding: 11px 17px; font-size: 12px; font-weight: 800; }
.primary-button { background: var(--blue); color: #fff; box-shadow: 0 8px 16px rgba(44,113,232,.18); } .secondary-button { background: #f1f5fa; color: #74859a; }
.analysis-card { padding: 18px; margin-top: 12px; background: #f2fbf7; border-color: #d0f1e2; }
.analysis-card h3 { color: #168663; } .analysis-card p { color: #668a7d; font-size: 12px; line-height: 1.7; margin-top: 8px; }
.analysis-card .analysis-label { display: inline-block; font-size: 10px; font-weight: 800; color: #168663; background: #d8f5e8; border-radius: 5px; padding: 3px 6px; margin-bottom: 7px; }
.empty-state { text-align: center; padding: 52px 20px; color: var(--muted); } .empty-state span { font-size: 35px; display: block; margin-bottom: 10px; }
.modal-backdrop { position: fixed; inset: 0; z-index: 60; background: rgba(19,37,62,.3); display: grid; align-items: end; }
.sheet { background: #fff; border-radius: 24px 24px 0 0; padding: 21px 21px max(24px, env(safe-area-inset-bottom)); max-width: 560px; width: 100%; margin: 0 auto; box-shadow: 0 -14px 34px rgba(17,45,83,.13); }
.sheet-head { display: flex; justify-content: space-between; align-items: center; } .sheet-head button { background: #f3f6fa; color: var(--muted); width: 28px; height: 28px; border-radius: 50%; }
.sheet p { color: var(--muted); font-size: 12px; line-height: 1.7; margin-top: 12px; } .sheet ol { color: #5e718b; font-size: 12px; line-height: 2.1; padding-left: 21px; }
.stage-choices { display: grid; gap: 15px; margin-top: 17px; }
.stage-group { display: flex; align-items: center; gap: 12px; }
.stage-group > strong { width: 36px; color: var(--blue-deep); font-size: 13px; }
.stage-group-buttons { flex: 1; display: grid; grid-template-columns: repeat(2, 1fr); gap: 8px; }
.stage-choice { padding: 10px 8px; border: 1px solid var(--line); border-radius: 10px; background: #fff; color: var(--muted); font-size: 12px; font-weight: 700; }
.stage-choice.is-active { color: var(--blue); border-color: #8ab6f6; background: var(--blue-soft); }
.stage-hint { margin-bottom: 0; color: var(--muted); font-size: 11px; }
@media (min-width: 800px) { .bottom-nav { width: 390px; border: 1px solid var(--line); border-radius: 20px 20px 0 0; } .main-content { padding-left: 54px; padding-right: 54px; } }
@media (max-width: 720px) { .topbar { padding: 0 18px; } .main-content { padding: 18px 16px 105px; } .home-grid { grid-template-columns: 1fr; } .streak-card { margin-top: 0; } .mistake-top { grid-template-columns: 1fr; } .page-heading { margin-top: 2px; } }
@media (max-width: 390px) { .hero-card { padding: 20px; } .hero-card h2 { font-size: 21px; } .hero-action { position: static; margin-top: 20px; } .hero-card { min-height: 0; } .subject-grid { gap: 7px; } .subject-card { padding: 10px; } }