:root {
  --ink: #20233b;
  --muted: #70758e;
  --line: #e7e8f2;
  --surface: #ffffff;
  --canvas: #f7f8fc;
  --primary: #5b5bd6;
  --primary-dark: #4646bb;
  --primary-soft: #eeeeff;
  --mint: #dff8ef;
  --mint-strong: #29a77c;
  --peach: #fff0e7;
  --orange: #ed7b42;
  --yellow: #fff7cf;
  --red: #d95467;
  --shadow: 0 18px 45px rgba(45, 49, 93, 0.11);
  --radius: 22px;
}

* { box-sizing: border-box; }
html { font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif; color: var(--ink); background: var(--canvas); }
body { margin: 0; min-width: 320px; min-height: 100vh; }
button, input, textarea, select { font: inherit; }
button { cursor: pointer; }
.hidden { display: none !important; }
.muted { color: var(--muted); }
.hint { margin: -3px 0 0; color: var(--muted); font-size: 0.82rem; line-height: 1.5; }
.eyebrow, .page-kicker { color: var(--primary); font-size: 0.72rem; font-weight: 800; letter-spacing: 0.14em; text-transform: uppercase; }
.eyebrow.light { color: #d9dafd; }
.brand { display: flex; align-items: center; gap: 11px; font-weight: 850; letter-spacing: -0.02em; }
.brand-mark { display: grid; width: 38px; height: 38px; place-items: center; border-radius: 12px 12px 18px 12px; background: var(--primary); color: #fff; font-family: Georgia, serif; font-size: 1.25rem; box-shadow: 0 8px 20px rgba(91,91,214,.28); }
.brand-large { position: relative; z-index: 1; color: white; font-size: 1.1rem; }
.brand-large .brand-mark { background: #fff; color: var(--primary); box-shadow: none; }

.auth-page { min-height: 100vh; display: grid; grid-template-columns: minmax(480px, 1.05fr) minmax(440px, .95fr); background: #fff; }
.auth-hero { position: relative; overflow: hidden; display: flex; flex-direction: column; justify-content: space-between; padding: 52px 8vw 50px 6vw; background: #5656c9; color: #fff; }
.auth-hero::after { content: ""; position: absolute; inset: 0; opacity: .1; background-image: radial-gradient(#fff 1.1px, transparent 1.1px); background-size: 23px 23px; mask-image: linear-gradient(to bottom right, transparent 10%, #000 85%); }
.hero-orb { position: absolute; border-radius: 999px; border: 55px solid rgba(255,255,255,.07); }
.orb-one { width: 320px; height: 320px; right: -110px; top: 70px; }
.orb-two { width: 240px; height: 240px; left: -100px; bottom: -100px; }
.hero-copy { position: relative; z-index: 1; max-width: 650px; margin: 80px 0 50px; }
.hero-copy h1 { margin: 13px 0 22px; font-size: clamp(2.8rem, 4.4vw, 5.1rem); line-height: .99; letter-spacing: -.055em; }
.hero-copy p { max-width: 560px; color: #e4e4ff; font-size: 1.08rem; line-height: 1.7; }
.hero-card-row { position: relative; z-index: 2; height: 140px; margin-left: 20px; }
.mini-card { position: absolute; width: 250px; height: 125px; padding: 28px; border-radius: 22px; box-shadow: var(--shadow); display: flex; flex-direction: column; justify-content: center; }
.mini-card span { font-size: 1.55rem; font-weight: 800; }
.mini-card small { margin-top: 8px; line-height: 1.45; }
.card-a { left: 0; top: 0; background: #fff; color: var(--primary); transform: rotate(-5deg); }
.card-b { left: 200px; top: 3px; background: #fff3cf; color: #4c3d24; transform: rotate(5deg); }
.auth-panel { display: grid; place-items: center; padding: 44px; }
.auth-box { width: min(100%, 430px); }
.auth-mobile-brand { display: none; margin-bottom: 45px; }
.login-role-switch { display: grid; grid-template-columns: 1fr 1fr; gap: 9px; }
.login-role-switch label { position: relative; display: block; cursor: pointer; }
.login-role-switch input { position: absolute; width: 1px; height: 1px; opacity: 0; pointer-events: none; }
.login-role-switch span { min-height: 73px; padding: 12px 13px; display: flex; flex-direction: column; justify-content: center; border: 1px solid var(--line); border-radius: 14px; background: #fff; transition: .2s; }
.login-role-switch b { font-size: .86rem; }
.login-role-switch small { margin-top: 5px; color: var(--muted); font-size: .68rem; font-weight: 550; }
.login-role-switch input:checked + span { border-color: var(--primary); color: var(--primary); background: var(--primary-soft); box-shadow: 0 0 0 3px rgba(91,91,214,.08); }
.login-role-switch input:focus-visible + span { outline: 2px solid var(--primary); outline-offset: 2px; }
.stack { display: flex; flex-direction: column; gap: 18px; }
.stack h2 { margin: 8px 0 5px; font-size: 2.1rem; letter-spacing: -.035em; }
.stack p { margin: 0; line-height: 1.55; }
label { display: flex; flex-direction: column; gap: 8px; font-size: .88rem; font-weight: 700; color: #3f435b; }
input, textarea, select { width: 100%; border: 1px solid var(--line); border-radius: 13px; background: #fff; color: var(--ink); padding: 13px 14px; outline: none; transition: .2s; }
input:focus, textarea:focus, select:focus { border-color: var(--primary); box-shadow: 0 0 0 4px rgba(91,91,214,.1); }
textarea { resize: vertical; min-height: 90px; line-height: 1.55; }
.button { border: 0; border-radius: 13px; padding: 12px 17px; display: inline-flex; align-items: center; justify-content: center; gap: 9px; font-weight: 800; color: var(--ink); background: #f0f1f6; transition: transform .15s, background .2s, box-shadow .2s; }
.button:hover { transform: translateY(-1px); }
.button:disabled { cursor: not-allowed; opacity: .58; transform: none; }
.button.primary { color: #fff; background: var(--primary); box-shadow: 0 9px 22px rgba(91,91,214,.22); }
.button.primary:hover { background: var(--primary-dark); }
.button.soft { color: var(--primary); background: var(--primary-soft); }
.button.ghost { color: var(--muted); background: transparent; border: 1px solid var(--line); }
.button.danger-soft { color: var(--red); background: #fff0f2; }
.button.small { padding: 9px 13px; font-size: .82rem; border-radius: 11px; }
.button.full { width: 100%; min-height: 49px; margin-top: 4px; }
.center-state { min-height: 160px; display: grid; place-items: center; align-content: center; gap: 14px; color: var(--muted); }
.center-state p { margin: 0; }
.spinner { width: 27px; height: 27px; border: 3px solid var(--line); border-top-color: var(--primary); border-radius: 50%; animation: spin .8s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }

.app { min-height: 100vh; display: grid; grid-template-columns: 258px 1fr; }
.sidebar { position: sticky; top: 0; height: 100vh; z-index: 20; display: flex; flex-direction: column; padding: 28px 20px 20px; background: #fff; border-right: 1px solid var(--line); }
.sidebar .brand { padding: 0 9px 27px; }
.side-nav { display: flex; flex-direction: column; gap: 7px; margin-top: 8px; }
.nav-button { width: 100%; border: 0; border-radius: 13px; padding: 12px 13px; display: flex; align-items: center; gap: 12px; color: var(--muted); background: transparent; text-align: left; font-weight: 750; }
.nav-button:hover { color: var(--ink); background: var(--canvas); }
.nav-button.active { color: var(--primary); background: var(--primary-soft); }
.nav-icon { display: grid; place-items: center; width: 25px; font-size: 1.05rem; }
.sidebar-foot { display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: 10px; margin-top: auto; padding: 17px 6px 2px; border-top: 1px solid var(--line); }
.user-avatar, .avatar { display: grid; place-items: center; border-radius: 13px; background: var(--mint); color: #18785a; font-weight: 900; }
.user-avatar { width: 39px; height: 39px; }
.user-meta { min-width: 0; display: flex; flex-direction: column; }
.user-meta strong { overflow: hidden; white-space: nowrap; text-overflow: ellipsis; font-size: .85rem; }
.user-meta small { margin-top: 2px; color: var(--muted); font-size: .73rem; }
.icon-button { border: 0; width: 36px; height: 36px; border-radius: 11px; display: grid; place-items: center; color: var(--muted); background: transparent; font-size: 1.1rem; }
.icon-button:hover { color: var(--ink); background: var(--canvas); }
.main-area { min-width: 0; }
.topbar { min-height: 91px; padding: 20px clamp(22px,4vw,54px); display: flex; align-items: center; justify-content: space-between; gap: 20px; background: rgba(247,248,252,.92); border-bottom: 1px solid var(--line); backdrop-filter: blur(10px); }
.topbar h2 { margin: 2px 0 0; font-size: 1.5rem; letter-spacing: -.025em; }
.page-kicker { margin: 0; }
.topbar-actions { display: flex; align-items: center; gap: 10px; }
.date-chip, .count-pill, .tag { display: inline-flex; align-items: center; border-radius: 999px; padding: 8px 12px; color: var(--muted); background: #fff; border: 1px solid var(--line); font-size: .78rem; font-weight: 750; }
.menu-button { display: none; }
.content { max-width: 1480px; margin: 0 auto; padding: 34px clamp(22px,4vw,54px) 70px; outline: none; }
.section-head { display: flex; align-items: end; justify-content: space-between; gap: 20px; margin-bottom: 22px; }
.section-head h3 { margin: 0 0 5px; font-size: 1.35rem; letter-spacing: -.025em; }
.section-head p { margin: 0; color: var(--muted); line-height: 1.55; }
.welcome { position: relative; overflow: hidden; min-height: 180px; padding: 32px 35px; display: flex; align-items: center; justify-content: space-between; border-radius: var(--radius); color: #fff; background: #5b5bd6; box-shadow: var(--shadow); }
.welcome::after { content: "Aa"; position: absolute; right: 35px; top: -24px; color: rgba(255,255,255,.08); font-family: Georgia,serif; font-size: 13rem; font-weight: 900; }
.welcome > * { position: relative; z-index: 1; }
.welcome h3 { margin: 7px 0 9px; font-size: clamp(1.75rem,3vw,2.55rem); letter-spacing: -.04em; }
.welcome p { margin: 0; max-width: 620px; color: #e4e4ff; line-height: 1.6; }
.welcome .button { background: #fff; color: var(--primary); flex-shrink: 0; }
.stats-grid { margin: 22px 0 34px; display: grid; grid-template-columns: repeat(3,1fr); gap: 18px; }
.stat-card, .panel, .class-card, .lesson-card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: 0 7px 25px rgba(45,49,93,.045); }
.stat-card { min-height: 128px; padding: 23px; display: grid; grid-template-columns: auto 1fr; gap: 17px; align-items: center; }
.stat-icon { width: 52px; height: 52px; display: grid; place-items: center; border-radius: 17px; background: var(--primary-soft); font-size: 1.35rem; }
.stat-icon.mint { background: var(--mint); }
.stat-icon.peach { background: var(--peach); }
.stat-value { display: block; font-size: 1.9rem; font-weight: 900; letter-spacing: -.04em; }
.stat-label { color: var(--muted); font-size: .84rem; }
.grid-two { display: grid; grid-template-columns: minmax(0,1.5fr) minmax(280px,.75fr); gap: 20px; }
.panel { padding: 24px; }
.panel-title { display: flex; align-items: center; justify-content: space-between; margin-bottom: 16px; }
.panel-title h3 { margin: 0; font-size: 1.05rem; }
.empty { padding: 35px 15px; display: grid; place-items: center; text-align: center; color: var(--muted); }
.empty-icon { width: 55px; height: 55px; margin-bottom: 12px; display: grid; place-items: center; border-radius: 18px; background: var(--primary-soft); font-size: 1.5rem; }
.list { display: flex; flex-direction: column; }
.list-row { min-height: 64px; display: grid; grid-template-columns: auto minmax(0,1fr) auto; align-items: center; gap: 13px; border-bottom: 1px solid var(--line); }
.list-row:last-child { border-bottom: 0; }
.list-row .avatar { width: 39px; height: 39px; }
.list-main { min-width: 0; }
.list-main strong, .list-main span { display: block; overflow: hidden; white-space: nowrap; text-overflow: ellipsis; }
.list-main small { display: block; margin-top: 4px; color: var(--muted); }
.cards-grid { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); gap: 18px; }
.class-card, .lesson-card { padding: 22px; }
.class-card-top, .lesson-card-top { display: flex; align-items: start; justify-content: space-between; gap: 14px; }
.class-badge { width: 46px; height: 46px; display: grid; place-items: center; border-radius: 15px; color: var(--primary); background: var(--primary-soft); font-weight: 900; }
.class-card h4, .lesson-card h4 { margin: 17px 0 5px; font-size: 1.05rem; }
.class-card p, .lesson-card p { min-height: 39px; margin: 0; color: var(--muted); font-size: .84rem; line-height: 1.5; }
.card-metrics { display: flex; gap: 18px; margin: 18px 0; padding-top: 15px; border-top: 1px solid var(--line); color: var(--muted); font-size: .8rem; }
.card-metrics strong { color: var(--ink); }
.table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: 16px; background: #fff; }
table { width: 100%; border-collapse: collapse; }
th, td { padding: 14px 16px; border-bottom: 1px solid var(--line); text-align: left; font-size: .84rem; }
th { color: var(--muted); background: #fafafe; font-size: .73rem; text-transform: uppercase; letter-spacing: .06em; }
tr:last-child td { border-bottom: 0; }
.rank { display: grid; width: 30px; height: 30px; place-items: center; border-radius: 10px; background: #f1f2f7; font-weight: 900; }
.rank.top-1 { color: #7b5900; background: #fff0ae; }
.rank.top-2 { color: #536173; background: #e9eef4; }
.rank.top-3 { color: #8c4f33; background: #f8dfd1; }
.badge { display: inline-flex; padding: 5px 9px; border-radius: 999px; font-size: .72rem; font-weight: 800; color: #23785c; background: var(--mint); }
.badge.warning { color: #9a5b1b; background: var(--yellow); }
.lesson-layout { display: grid; grid-template-columns: minmax(0,1.15fr) minmax(320px,.85fr); gap: 22px; align-items: start; }
.import-panel { position: sticky; top: 22px; }
.field-row { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.dropzone { position: relative; padding: 22px; border: 1.5px dashed #c9cbe0; border-radius: 16px; color: var(--muted); background: #fafaff; text-align: center; }
.dropzone input { position: absolute; inset: 0; opacity: 0; cursor: pointer; }
.dropzone strong { color: var(--primary); }
.or { display: flex; align-items: center; gap: 12px; color: #9a9db1; font-size: .75rem; }
.or::before, .or::after { content: ""; height: 1px; flex: 1; background: var(--line); }
.word-preview { max-height: 370px; overflow: auto; display: flex; flex-direction: column; gap: 8px; }
.word-row { display: grid; grid-template-columns: 30px minmax(100px,.8fr) minmax(120px,1.2fr) auto; gap: 9px; align-items: center; padding: 9px; border-radius: 12px; background: #fafafe; }
.word-row input { padding: 9px 10px; border-radius: 9px; }
.word-index { color: var(--muted); font-size: .76rem; text-align: center; }
.progress-track { height: 8px; overflow: hidden; border-radius: 99px; background: #e9eaf3; }
.progress-track span { display: block; height: 100%; border-radius: inherit; background: var(--primary); transition: width .3s; }
.lesson-progress { margin: 15px 0 7px; }
.lesson-progress-label { display: flex; justify-content: space-between; margin-top: 7px; color: var(--muted); font-size: .76rem; }
.lesson-card .button { width: 100%; }
.lesson-card-actions { margin-top: 13px; display: grid; grid-template-columns: repeat(auto-fit,minmax(120px,1fr)); gap: 8px; }
.review-hub { margin: 0 0 34px; padding: 20px 22px; display: flex; align-items: center; justify-content: space-between; gap: 20px; border: 1px solid #ddd9ff; border-radius: var(--radius); background: linear-gradient(135deg,#f2f0ff,#fffaf0); }
.review-hub > div:first-child { display: flex; align-items: center; gap: 14px; }
.review-hub-icon { width: 50px; height: 50px; display: grid; flex: 0 0 auto; place-items: center; border-radius: 16px; background: #fff; font-size: 1.45rem; box-shadow: 0 8px 20px rgba(70,70,150,.09); }
.review-hub h3 { margin: 0 0 4px; font-size: 1.05rem; }
.review-hub p { margin: 0; color: var(--muted); font-size: .82rem; }
.review-hub-actions { display: flex; flex: 0 0 auto; gap: 8px; }
.personal-intro { margin-bottom: 30px; padding: 27px 30px; display: flex; align-items: center; justify-content: space-between; gap: 22px; border: 1px solid #cdeedf; border-radius: var(--radius); background: linear-gradient(135deg,#effcf7,#fffdf3); }
.personal-intro h3 { margin: 6px 0 7px; font-size: 1.45rem; }
.personal-intro p { max-width: 680px; margin: 0; color: var(--muted); line-height: 1.55; }
.personal-intro .button { flex: 0 0 auto; }
.personal-folder-icon { width: 46px; height: 46px; display: grid; place-items: center; border-radius: 15px; color: #15795b; background: var(--mint); font-size: 1.25rem; font-weight: 900; }
.personal-set-actions { margin-top: 13px; display: grid; grid-template-columns: repeat(auto-fit,minmax(88px,1fr)); gap: 7px; }
.personal-set-actions .button { min-width: 0; padding: 10px 6px; font-size: .74rem; }
.callout { padding: 13px 14px; border-radius: 12px; color: #76501b; background: var(--yellow); font-size: .84rem; }
.quick-tip { padding: 18px; border-radius: 17px; background: var(--yellow); }
.quick-tip h4 { margin: 0 0 7px; }
.quick-tip p { margin: 0; color: #746541; font-size: .84rem; line-height: 1.6; }

.modal { width: min(92vw,520px); max-height: 90vh; padding: 0; border: 0; border-radius: 23px; background: transparent; box-shadow: var(--shadow); }
.modal.modal-wide { width: min(94vw,980px); }
.modal::backdrop { background: rgba(27,29,49,.48); backdrop-filter: blur(3px); }
.modal-card { padding: 27px; background: #fff; overflow-y: auto; }
.modal-card h3 { margin: 6px 0 0; font-size: 1.45rem; }
.modal-head { display: flex; align-items: start; justify-content: space-between; }
.form-actions { display: flex; justify-content: flex-end; gap: 10px; margin-top: 5px; }
.student-list { max-height: 180px; overflow: auto; display: flex; flex-direction: column; gap: 7px; }
.student-chip { display: flex; align-items: center; gap: 9px; padding: 10px; border-radius: 11px; background: var(--canvas); }
.student-chip .avatar { width: 31px; height: 31px; font-size: .76rem; }
.editor-heading { display: flex; align-items: end; justify-content: space-between; gap: 18px; padding-top: 4px; }
.editor-heading p { margin: 4px 0 0; color: var(--muted); font-size: .8rem; font-weight: 500; }
.edit-card-list { max-height: 48vh; overflow-y: auto; padding-right: 5px; display: flex; flex-direction: column; gap: 12px; }
.edit-card { padding: 15px; border: 1px solid var(--line); border-radius: 16px; background: #fafafe; }
.edit-card-top { display: grid; grid-template-columns: 34px minmax(120px,.8fr) minmax(140px,1.1fr) minmax(110px,.7fr) minmax(95px,.6fr) 104px auto; gap: 9px; align-items: center; }
.edit-card-examples { margin: 10px 0 0 43px; display: grid; grid-template-columns: 1fr 1fr minmax(155px,.8fr); gap: 9px; }
.edit-card input { padding: 10px 11px; border-radius: 10px; background: #fff; }
.edit-card .edit-emoji { padding-left: 7px; padding-right: 7px; text-align: center; font-size: 1.15rem; }
.edit-visual-control { min-width: 0; display: grid; grid-template-columns: minmax(52px,1fr) 36px; gap: 5px; align-items: center; }
.edit-visual-control .ai-visual-button { color: var(--primary); background: var(--primary-soft); }
.edit-card-number { color: var(--primary); font-size: .78rem; font-weight: 900; text-align: center; }
.review-select-all-row, .review-lesson-option { flex-direction: row; align-items: center; cursor: pointer; }
.review-select-all-row { padding: 12px 14px; border-radius: 12px; color: var(--primary); background: var(--primary-soft); }
.review-select-all-row input, .review-lesson-option input { width: 18px; height: 18px; flex: 0 0 auto; padding: 0; accent-color: var(--primary); }
.review-lesson-list { max-height: 43vh; overflow-y: auto; display: flex; flex-direction: column; gap: 8px; padding-right: 4px; }
.review-lesson-option { padding: 12px 13px; border: 1px solid var(--line); border-radius: 13px; background: #fff; }
.review-lesson-option:has(input:checked) { border-color: #bab4f4; background: #f8f7ff; }
.review-lesson-option span { min-width: 0; }
.review-lesson-option strong, .review-lesson-option small { display: block; }
.review-lesson-option small { margin-top: 4px; color: var(--muted); font-size: .74rem; font-weight: 550; }
.review-selected-count { color: var(--primary); font-size: .8rem; font-weight: 800; }

.study-overlay { position: fixed; inset: 0; z-index: 100; display: flex; flex-direction: column; background: #f7f8fc; }
.study-topbar { min-height: 84px; padding: 16px clamp(18px,4vw,50px); display: grid; grid-template-columns: 110px minmax(180px,620px) 110px; align-items: center; justify-content: space-between; gap: 24px; background: #fff; border-bottom: 1px solid var(--line); }
.study-progress-wrap { display: grid; gap: 8px; text-align: center; }
.study-stage { flex: 1; padding: 35px 18px 55px; display: grid; place-items: center; overflow: auto; }
.flash-wrap { width: min(100%,680px); text-align: center; }
.flash-hint { margin: 0 0 16px; color: var(--muted); font-size: .82rem; }
.flashcard { min-height: 390px; padding: 38px; display: flex; flex-direction: column; align-items: center; justify-content: center; border: 1px solid var(--line); border-radius: 30px; background: #fff; box-shadow: var(--shadow); }
.card-illustration { width: 72px; height: 72px; margin: 14px auto 4px; display: grid; flex: 0 0 auto; place-items: center; overflow: hidden; border: 1px solid #e1dcff; border-radius: 18px; background: linear-gradient(145deg,#f1efff,#fff8df); box-shadow: 0 8px 18px rgba(90,82,170,.1); }
.card-illustration > span { font-size: 2.75rem; line-height: 1; filter: drop-shadow(0 3px 5px rgba(32,35,64,.1)); }
.card-illustration.compact { width: 54px; height: 54px; min-height: 0; margin: 0; border-radius: 14px; }
.card-illustration.compact > span { font-size: 2rem; }
.visual-thumbnail-row { width: fit-content; max-width: 100%; margin: 12px auto 3px; display: flex; align-items: center; gap: 10px; }
.visual-thumbnail-row > small { max-width: 170px; color: var(--muted); font-size: .74rem; font-weight: 750; text-align: left; line-height: 1.35; }
.flash-word { margin: 8px 0 4px; color: var(--primary); font-family: Georgia,serif; font-size: clamp(3rem,8vw,5.5rem); letter-spacing: -.045em; overflow-wrap: anywhere; }
.part-of-speech { display: inline-flex; width: fit-content; margin: 3px auto 0; padding: 5px 10px; border-radius: 999px; color: #5f52a9; background: #efecff; font-size: .72rem; font-weight: 850; }
.card-source { display: inline-flex; width: fit-content; max-width: 100%; margin: 0 auto 7px; padding: 5px 9px; overflow: hidden; border-radius: 999px; color: var(--muted); background: #f4f5f9; font-size: .68rem; font-weight: 750; text-overflow: ellipsis; white-space: nowrap; }
.speak-button { border: 0; width: 43px; height: 43px; margin-top: 22px; border-radius: 50%; color: var(--primary); background: var(--primary-soft); font-size: 1.05rem; }
.flash-back { width: 100%; }
.flash-back .flash-word { margin-bottom: 5px; font-size: clamp(2.2rem,6vw,3.8rem); }
.ipa { color: var(--muted); font-size: 1rem; }
.meaning { margin: 24px 0; font-size: clamp(1.6rem,4vw,2.35rem); font-weight: 900; letter-spacing: -.025em; }
.example-box { padding: 18px; border-radius: 17px; background: var(--primary-soft); }
.example-label { display: block; margin-bottom: 8px; color: #6d64a8; font-size: .64rem; font-weight: 900; letter-spacing: .08em; }
.example-en { margin: 0; font-size: 1.15rem; font-weight: 800; }
.example-vi { margin: 7px 0 0; color: var(--muted); }
.reveal-button { min-width: 210px; margin-top: 24px; }
.rating-prompt { margin: 22px 0 11px; color: var(--muted); font-size: .85rem; }
.rating-row { display: grid; grid-template-columns: repeat(3,1fr); gap: 10px; }
.rating-button { min-height: 57px; padding: 10px; border: 1px solid var(--line); border-radius: 14px; background: #fff; font-weight: 850; }
.rating-button.again { color: var(--red); background: #fff3f4; }
.rating-button.fuzzy { color: #a16b18; background: var(--yellow); }
.rating-button.mastered { color: #168060; background: var(--mint); }
.done-state { text-align: center; }
.done-icon { width: 92px; height: 92px; margin: 0 auto 18px; display: grid; place-items: center; border-radius: 29px; background: var(--mint); font-size: 2.5rem; }
.done-state h3 { margin: 0 0 8px; font-size: 2rem; }
.done-state p { margin: 0 0 22px; color: var(--muted); }
.done-actions { display: flex; justify-content: center; flex-wrap: wrap; gap: 10px; }
.toast { position: fixed; left: 50%; bottom: 24px; z-index: 200; max-width: min(90vw,520px); padding: 13px 17px; border-radius: 13px; color: #fff; background: #272a43; box-shadow: var(--shadow); opacity: 0; pointer-events: none; transform: translate(-50%,18px); transition: .25s; font-size: .85rem; font-weight: 700; }
.toast.show { opacity: 1; transform: translate(-50%,0); }
.toast.error { background: #b64153; }

@media (max-width: 1080px) {
  .cards-grid { grid-template-columns: repeat(2,minmax(0,1fr)); }
  .lesson-layout { grid-template-columns: 1fr; }
  .import-panel { position: static; }
}
@media (max-width: 880px) {
  .auth-page { grid-template-columns: 1fr; }
  .auth-hero { display: none; }
  .auth-mobile-brand { display: flex; }
  .auth-panel { min-height: 100vh; padding: 28px; }
  .app { grid-template-columns: 1fr; }
  .sidebar { position: fixed; left: -280px; width: 258px; box-shadow: var(--shadow); transition: left .22s; }
  .sidebar.open { left: 0; }
  .menu-button { display: grid; }
  .topbar { justify-content: flex-start; }
  .topbar-actions { margin-left: auto; }
  .date-chip { display: none; }
}
@media (max-width: 680px) {
  .topbar { padding: 15px 17px; }
  .content { padding: 24px 16px 55px; }
  .topbar-actions .button { display: none; }
  .welcome { padding: 26px; display: block; }
  .welcome .button { margin-top: 20px; }
  .review-hub { align-items: stretch; flex-direction: column; }
  .review-hub-actions { display: grid; grid-template-columns: 1fr 1fr; }
  .review-hub-actions .button { min-width: 0; padding-left: 9px; padding-right: 9px; font-size: .74rem; }
  .personal-intro { align-items: stretch; flex-direction: column; padding: 24px; }
  .personal-intro .button { width: 100%; }
  .stats-grid, .cards-grid, .grid-two { grid-template-columns: 1fr; }
  .stats-grid { gap: 11px; }
  .stat-card { min-height: 100px; }
  .field-row { grid-template-columns: 1fr; }
  .word-row { grid-template-columns: 24px 1fr auto; }
  .word-row .meaning-input { grid-column: 2 / 3; }
  .study-topbar { min-height: 72px; padding: 12px 14px; grid-template-columns: 75px 1fr 52px; gap: 9px; }
  .study-topbar .button { padding: 8px; font-size: .75rem; }
  .study-stage { padding: 20px 13px 35px; }
  .flashcard { min-height: 355px; padding: 25px 20px; }
  .rating-row { grid-template-columns: repeat(3,minmax(0,1fr)); gap: 6px; }
  .rating-button { min-width: 0; min-height: 48px; padding: 7px 4px; font-size: .7rem; line-height: 1.2; }
  .section-head { align-items: start; }
  .editor-heading { align-items: start; }
  .edit-card-top { grid-template-columns: 25px 1fr auto; }
  .edit-card-top .edit-meaning, .edit-card-top .edit-pos, .edit-card-top .edit-ipa, .edit-card-top .edit-visual-control { grid-column: 2 / 3; }
  .edit-card-examples { margin-left: 34px; grid-template-columns: 1fr; }
}