:root {
    --bg: #f7f7f5;
    --paper: #ffffff;
    --ink: #171a18;
    --muted: #777d78;
    --line: #e7e9e6;
    --green: #28664e;
    --green2: #1f513e;
    --orange: #b76b43;
    --soft: #eef4f0;
    --shadow: 0 18px 50px rgba(22, 29, 25, .06);
}

body {
    letter-spacing: -.01em;
}

.topbar {
    position: relative;
    top: auto;
    height: 72px;
    max-width: 1180px;
    margin: 0 auto;
    padding: 0 30px;
    border-bottom: 0;
    background: transparent;
    backdrop-filter: none;
}

.brand {
    gap: 10px;
}

.brand-mark {
    width: 34px;
    height: 34px;
    border-radius: 10px;
    transform: none;
    background: var(--ink);
    font-size: 16px;
}

.brand b {
    font-size: 17px;
    letter-spacing: .03em;
}

.brand small {
    display: none;
}

nav {
    gap: 3px;
    padding: 4px;
    border: 1px solid var(--line);
    border-radius: 13px;
    background: rgba(255, 255, 255, .7);
}

.nav-item {
    padding: 8px 14px;
    border-radius: 9px;
    font-size: 13px;
    transition: background .2s, color .2s, box-shadow .2s;
}

.nav-item.active {
    background: var(--paper);
    color: var(--ink);
    box-shadow: 0 2px 8px rgba(23, 26, 24, .08);
}

.nav-item span {
    background: var(--green);
}

.icon-button {
    width: 34px;
    height: 34px;
    border-radius: 10px;
    background: rgba(255, 255, 255, .55);
}

main {
    max-width: 1120px;
    padding: 0 30px 70px;
}

.hero {
    max-width: 680px;
    padding: 76px 0 40px;
}

.eyebrow {
    color: var(--green);
    font-size: 10px;
    letter-spacing: .18em;
}

.hero h1,
.section-head h1 {
    font-family: "Songti SC", "STSong", Georgia, serif;
    font-weight: 500;
    letter-spacing: -.045em;
}

.hero h1 {
    margin: 13px 0 16px;
    font-size: clamp(40px, 5vw, 62px);
}

.hero h1 em {
    color: var(--ink);
    font-style: normal;
    box-shadow: inset 0 -.27em 0 #dbe9df;
}

.hero > p:last-child,
.section-head > div > p:last-child {
    color: var(--muted);
    font-size: 15px;
}

.reader-layout {
    grid-template-columns: minmax(0, 1.55fr) minmax(300px, .85fr);
    gap: 18px;
}

.paper,
.lookup-card,
.flashcard {
    border: 1px solid var(--line);
    background: var(--paper);
    box-shadow: var(--shadow);
}

.paper {
    min-height: 0;
    overflow: hidden;
    border-radius: 18px;
}

.paper-toolbar {
    padding: 18px 24px;
    color: var(--muted);
    font-size: 12px;
}

.paper-toolbar b {
    color: var(--ink);
    font-weight: 600;
}

.status-dot {
    width: 6px;
    height: 6px;
    margin-right: 8px;
    background: #4b9675;
}

.manual-form {
    padding: 30px 32px 32px;
}

.manual-form > label {
    color: var(--ink);
    font-size: 12px;
    font-weight: 600;
}

.manual-form textarea {
    min-height: 150px;
    padding: 20px;
    border: 1px solid #dfe3df;
    border-radius: 13px;
    background: #fafbf9;
    font-family: "Iowan Old Style", Georgia, serif;
    font-size: 23px;
    line-height: 1.55;
    transition: border .2s, box-shadow .2s, background .2s;
}

.manual-form textarea::placeholder {
    color: #adb2ae;
}

.manual-form textarea:focus {
    border-color: #89ad9b;
    background: #fff;
    box-shadow: 0 0 0 4px rgba(40, 102, 78, .08);
}

.quick-examples {
    margin: 14px 0 26px;
    gap: 7px;
}

.quick-examples button {
    padding: 6px 11px;
    border: 0;
    border-radius: 8px;
    background: #f2f4f1;
    color: #5f6761;
    transition: background .2s, color .2s;
}

.quick-examples button:hover {
    background: var(--soft);
    color: var(--green);
}

.primary-button {
    border-radius: 10px;
    background: var(--ink);
    font-size: 13px;
    font-weight: 600;
    transition: transform .18s, background .18s;
}

.primary-button:hover {
    background: var(--green2);
    transform: translateY(-1px);
}

.manual-submit {
    max-width: 280px;
}

.manual-form .reader-hint {
    margin: 20px 0 0;
    padding: 0;
    border: 0;
    color: #9a9f9b;
    font-size: 11px;
}

.lookup-card {
    top: 24px;
    min-height: 365px;
    padding: 30px;
    border-radius: 18px;
}

.empty-lookup {
    padding: 66px 10px;
}

.big-icon,
.empty-state > span {
    width: 66px;
    height: 66px;
    border: 0;
    border-radius: 18px;
    background: var(--soft);
    font-size: 27px;
}

.empty-lookup h2 {
    margin: 22px 0 8px;
    font-family: "Songti SC", Georgia, serif;
    font-size: 22px;
}

.word-heading {
    margin: 14px 0 28px;
}

.word-heading h2 {
    max-width: 250px;
    font-size: clamp(28px, 3vw, 38px);
    line-height: 1.16;
    overflow-wrap: anywhere;
}

.sound-button {
    flex: 0 0 auto;
    width: 42px;
    height: 42px;
    background: var(--soft);
    font-size: 11px;
}

.translation-box {
    padding: 16px 0;
    border: 0;
    border-top: 1px solid var(--line);
    border-bottom: 1px solid var(--line);
    background: transparent;
}

.translation-box p {
    margin-top: 8px;
    font-size: 19px;
}

.source-sentence {
    min-height: 20px;
    margin: 16px 0;
    font-family: inherit;
    font-style: normal;
}

.section-head {
    padding: 76px 0 35px;
}

.section-head h1 {
    margin: 10px 0 8px;
    font-size: 48px;
}

.stat-card {
    padding: 14px 18px;
    border: 1px solid var(--line);
    border-radius: 14px;
    background: var(--paper);
}

.stat-card b {
    font-size: 40px;
    color: var(--ink);
}

.word-toolbar {
    padding: 12px;
    border: 1px solid var(--line);
    border-radius: 14px;
    background: var(--paper);
}

.search-box,
select {
    border: 0;
    border-radius: 9px;
    background: #f5f6f4;
}

.word-list {
    margin-top: 16px;
    border: 1px solid var(--line);
    border-radius: 16px;
    background: var(--paper);
    overflow: hidden;
}

.word-row {
    padding: 22px 24px;
    border-color: var(--line);
}

.word-row:last-child {
    border-bottom: 0;
}

.word-main b {
    font-size: 23px;
}

.mini-sound,
.delete-word {
    border-color: var(--line);
    background: #fafbfa;
}

.mastery {
    padding: 7px 11px;
    border-radius: 8px;
}

.review-shell {
    max-width: 640px;
}

.flashcard {
    min-height: 390px;
    border-radius: 20px;
    box-shadow: var(--shadow);
}

.flash-front h2 {
    margin: 34px 0 10px;
    font-size: clamp(40px, 7vw, 58px);
}

.review-actions button {
    border-radius: 10px;
}

.empty-state {
    margin-top: 15px;
    border: 1px solid var(--line);
    border-radius: 18px;
    background: var(--paper);
}

.toast {
    border-radius: 10px;
    box-shadow: 0 10px 28px rgba(0, 0, 0, .18);
}

body.dark {
    --bg: #151816;
    --paper: #1d211e;
    --ink: #f2f3ef;
    --muted: #9da39e;
    --line: #303531;
    --soft: #27342d;
}

body.dark nav,
body.dark .icon-button {
    background: rgba(29, 33, 30, .75);
}

body.dark .manual-form textarea,
body.dark .search-box,
body.dark select,
body.dark .quick-examples button,
body.dark .mini-sound,
body.dark .delete-word {
    background: #181b19;
}

body.dark .manual-form textarea:focus {
    background: #1b201d;
}

@media (max-width: 850px) {
    .topbar {
        padding: 0 18px;
    }

    main {
        padding: 0 18px 50px;
    }

    .hero {
        padding: 48px 0 30px;
    }

    .lookup-card {
        min-height: 260px;
    }
}

@media (max-width: 560px) {
    .topbar {
        height: 64px;
    }

    .brand {
        display: none;
    }

    nav {
        margin: 0 auto;
    }

    .hero h1 {
        font-size: 39px;
    }

    .manual-form {
        padding: 24px 20px;
    }

    .manual-form textarea {
        min-height: 130px;
        font-size: 20px;
    }

    .quick-examples span {
        width: 100%;
    }

    .section-head h1 {
        font-size: 40px;
    }
}