:root {
    --topics-ink: #14233b;
    --topics-paper: #fffdf9;
    --topics-coral: #ff694f;
    --topics-blue: #2868d7;
    --topics-gold: #e6aa3b;
    --topics-muted: #607087;
    --topics-line: #dce3ed;
}

html { scroll-behavior: smooth; }

body.writing-topics-page {
    margin: 0;
    padding: 0;
    color: var(--topics-ink);
    background:
        linear-gradient(rgba(20,35,59,.026) 1px, transparent 1px),
        linear-gradient(90deg, rgba(20,35,59,.026) 1px, transparent 1px),
        #f4f7fb;
    background-size: 30px 30px;
    font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
}

.writing-topics-page > .container {
    width: min(1180px, calc(100% - 40px));
    max-width: none;
    margin: 0 auto;
    padding: 36px 0 84px;
}

.writing-topics-page .header {
    position: relative;
    margin: 0 0 24px;
    padding: 50px 48px;
    color: #fff;
    background: var(--topics-ink);
    border-radius: 22px;
    text-align: left;
    overflow: hidden;
    box-shadow: 12px 12px 0 #d7e3f7;
}

.writing-topics-page .header::before {
    content: "";
    position: absolute;
    left: 0;
    top: 48px;
    width: 6px;
    height: 76px;
    background: var(--topics-coral);
    border-radius: 0 7px 7px 0;
}

.writing-topics-page .header::after {
    content: "30";
    position: absolute;
    right: 20px;
    bottom: -55px;
    color: rgba(255,255,255,.055);
    font: 900 210px/1 Georgia, serif;
    pointer-events: none;
}

.writing-topics-page .header h1 {
    position: relative;
    z-index: 1;
    margin: 0 0 12px;
    color: #fff;
    font: 700 clamp(38px, 5vw, 62px)/1.03 Georgia, "Songti SC", serif;
    letter-spacing: -.045em;
}

.writing-topics-page .header p {
    position: relative;
    z-index: 1;
    margin: 0;
    color: #b8c5d8;
    font-size: 15px;
}

/* 30-topic catalogue */
.writing-topics-index .overall-progress {
    margin: 32px 0 20px;
    padding: 24px 28px;
    color: var(--topics-ink);
    border: 1px solid var(--topics-line);
    border-radius: 18px;
    background: #fff;
    backdrop-filter: none;
    box-shadow: 0 18px 50px rgba(20,35,59,.07);
}

.writing-topics-index .stat-item { min-width: 120px; }
.writing-topics-index .stat-number { color: var(--topics-blue); font: 700 42px/1 Georgia, serif; }
.writing-topics-index .stat-label { margin-top: 7px; color: #748197; opacity: 1; }
.writing-topics-index .progress-bar-container { height: 10px; background: #e7ecf3; }
.writing-topics-index .progress-bar-fill { background: linear-gradient(90deg, var(--topics-coral), var(--topics-gold)); }
.writing-topics-index .progress-text { color: #67768c; }

.writing-topics-index .controls,
.writing-topics-index .filter-tabs { justify-content: flex-start; }

.writing-topics-index .control-btn,
.writing-topics-index .filter-tab {
    min-height: 42px;
    padding: 0 18px;
    color: var(--topics-ink);
    border: 1px solid #cfd8e5;
    border-radius: 10px;
    background: #fff;
    backdrop-filter: none;
    font-weight: 800;
}

.writing-topics-index .control-btn:hover,
.writing-topics-index .filter-tab:hover { color: var(--topics-blue); border-color: #8eaddf; background: #f3f7ff; }
.writing-topics-index .control-btn.danger { color: #b54332; border-color: #e6b2a9; }
.writing-topics-index .control-btn.danger:hover { background: #fff0ed; }
.writing-topics-index .filter-tab.active { color: #fff; border-color: var(--topics-ink); background: var(--topics-ink); }

.writing-topics-index .topics-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 14px; }
.writing-topics-index .topic-card {
    min-height: 225px;
    display: flex;
    flex-direction: column;
    padding: 23px;
    border: 1px solid #dfe5ee;
    border-radius: 16px;
    box-shadow: none;
}

.writing-topics-index .topic-card:nth-child(3n+2) { background: #f2f7ff; }
.writing-topics-index .topic-card:nth-child(3n) { background: #fff3ef; }
.writing-topics-index .topic-card:hover { border-color: #9ab3d8; box-shadow: 0 18px 36px rgba(20,35,59,.09); transform: translateY(-4px); }
.writing-topics-index .topic-card.completed::before { background: #3c9b6a; }
.writing-topics-index .topic-card.in-progress::before { background: var(--topics-gold); }
.writing-topics-index .topic-emoji { font-size: 31px; }
.writing-topics-index .topic-title { color: var(--topics-ink); font: 700 21px/1.2 Georgia, "Songti SC", serif; }
.writing-topics-index .topic-subtitle { color: #6d7b90; }
.writing-topics-index .topic-meta { margin-top: auto; padding-top: 20px; border-top: 1px solid #e3e8ef; }
.writing-topics-index .vocab-count { color: var(--topics-blue); background: #eaf1fd; }

/* Individual topic pages */
.writing-topic-detail > .container {
    width: min(1080px, calc(100% - 40px));
    padding-bottom: 84px;
    border: 1px solid var(--topics-line);
    border-top: 0;
    border-radius: 0 0 22px 22px;
    background: #fff;
    overflow: hidden;
    box-shadow: 0 24px 65px rgba(20,35,59,.09);
}

.writing-topic-detail .header {
    margin: 0;
    border-radius: 0;
    box-shadow: none;
}

.writing-topic-detail .header h1 { padding-left: 104px; font-size: clamp(34px, 4.4vw, 54px); }
.writing-topic-detail .header p { padding-left: 104px; }
.writing-topic-detail .back-link {
    z-index: 2;
    top: 50%;
    left: 46px;
    display: grid;
    place-items: center;
    width: 70px;
    height: 70px;
    padding: 0;
    color: #fff;
    border: 1px solid rgba(255,255,255,.36);
    border-radius: 50%;
    background: rgba(255,255,255,.07);
    text-decoration: none;
    transform: translateY(-50%);
}
.writing-topic-detail .back-link:hover { color: var(--topics-ink); border-color: #fff; background: #fff; }

.writing-topic-detail .progress-bar {
    margin: 0;
    padding: 22px 34px;
    border-radius: 0;
    background: #f5f8fc;
    box-shadow: inset 0 -1px #e1e7ef;
}
.writing-topic-detail .step-dot { border: 1px solid #cbd4e1; background: #fff; }
.writing-topic-detail .step-dot.active { color: #fff; background: var(--topics-blue); }
.writing-topic-detail .step-dot.completed { color: #fff; background: #3c9b6a; }
.writing-topic-detail .step-label { color: #6f7d91; }
.writing-topic-detail .content-area { padding: 34px; }
.writing-topic-detail .step-panel > h3,
.writing-topic-detail .reading-card h3 { color: var(--topics-blue) !important; font-family: Georgia, "Songti SC", serif; }
.writing-topic-detail .reading-card { padding: 24px; border: 1px solid #dfe5ee; border-radius: 14px; background: #fbfcfe; }
.writing-topic-detail .english-text { color: #253650; }
.writing-topic-detail .chinese-text { border-left-color: var(--topics-coral); background: #fff4f0; }
.writing-topic-detail .highlight-word { color: #a14331; border-bottom-color: var(--topics-coral); background: #fff0eb; }
.writing-topic-detail .toggle-btn { color: var(--topics-blue); }

.writing-topic-detail .btn {
    min-height: 44px;
    padding: 11px 20px;
    color: #fff;
    border: 1px solid var(--topics-ink);
    border-radius: 9px;
    background: var(--topics-ink);
    box-shadow: none;
    font-weight: 850;
}
.writing-topic-detail .btn:hover { background: #243856; box-shadow: 0 8px 22px rgba(20,35,59,.16); }
.writing-topic-detail .btn-secondary { color: var(--topics-ink); border-color: #cfd8e5; background: #fff; }
.writing-topic-detail .btn-secondary:hover { color: var(--topics-blue); border-color: #8eaddf; background: #f3f7ff; }
.writing-topic-detail .btn-success { border-color: #2f8658; background: #2f8658; }
.writing-topic-detail .btn-success:hover { background: #28764d; }

.writing-topic-detail .score-display { color: var(--topics-blue); }
.writing-topic-detail .vocab-item { color: #33445c; border-color: #d6deea; border-radius: 10px; background: #fff; }
.writing-topic-detail .vocab-item:hover { color: var(--topics-blue); border-color: #87a7db; background: #f2f6fd; }
.writing-topic-detail .vocab-item.selected { color: #fff; border-color: var(--topics-blue); background: var(--topics-blue); }
.writing-topic-detail .vocab-item.matched { color: #216643; border-color: #60ad81; background: #eaf6ef; }
.writing-topic-detail .cloze-text { border-left-color: var(--topics-blue); border-radius: 12px; background: #f6f9fd; }
.writing-topic-detail .cloze-input { color: var(--topics-ink); border-bottom-color: #7f9fce; }
.writing-topic-detail .cloze-input:focus { border-color: var(--topics-blue); }
.writing-topic-detail .result-summary { border: 1px solid #c9d8ee; border-radius: 14px; background: #f2f7ff; }
.writing-topic-detail .result-summary h3 { color: var(--topics-blue); }
.writing-topic-detail .completion-badge { background: #2f8658; }

@media (max-width: 900px) {
    .writing-topics-index .topics-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 640px) {
    .writing-topics-page > .container,
    .writing-topic-detail > .container { width: calc(100% - 18px); padding-top: 9px; }
    .writing-topics-page .header { padding: 36px 24px; border-radius: 16px; box-shadow: 7px 7px 0 #d7e3f7; }
    .writing-topics-page .header h1 { font-size: 38px; }
    .writing-topics-page .header::after { right: -26px; font-size: 132px; }
    .writing-topics-index .progress-stats { display: grid; grid-template-columns: repeat(2, 1fr); }
    .writing-topics-index .topics-grid { grid-template-columns: 1fr; }
    .writing-topics-index .topic-card { min-height: 205px; }
    .writing-topic-detail > .container { border-radius: 0 0 16px 16px; }
    .writing-topic-detail .header { min-height: 210px; padding: 86px 24px 32px; border-radius: 0; box-shadow: none; }
    .writing-topic-detail .header h1,
    .writing-topic-detail .header p { padding-left: 0; }
    .writing-topic-detail .back-link { top: 24px; left: 24px; width: auto; height: 40px; padding: 0 14px; border-radius: 9px; transform: none; }
    .writing-topic-detail .progress-bar { padding: 18px 14px; }
    .writing-topic-detail .content-area { padding: 22px 16px; }
    .writing-topic-detail .reading-card { padding: 18px; }
    .writing-topic-detail #step2 > div[style*="grid-template-columns"],
    .writing-topic-detail .reading-card > div[style*="grid-template-columns"] { grid-template-columns: 1fr !important; }
    .writing-topic-detail .cloze-input { max-width: 100%; }
}

@media (prefers-reduced-motion: reduce) {
    .writing-topics-page * { animation: none !important; transition: none !important; }
}