/* ============================================================
   IELTS Writing Coach — Oxford Examination Hall Theme
   Palette: warm ivory · deep navy ink · burnished gold
   Fonts: Playfair Display (headings) + Source Serif 4 (body) + DM Mono (numbers)
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Playfair+Display:ital,wght@0,600;0,700;0,800;1,600&family=Source+Serif+4:ital,opsz,wght@0,8..60,300;0,8..60,400;0,8..60,600;1,8..60,400&family=DM+Mono:wght@400;500&display=swap');

/* ── Reset ── */
.iwc-wrap *, .iwc-wrap *::before, .iwc-wrap *::after {
    box-sizing: border-box; margin: 0; padding: 0;
}

/* ── Tokens ── */
.iwc-wrap {
    --ivory:       #faf8f2;
    --ivory-dark:  #f0ece0;
    --ivory-deep:  #e8e0cc;
    --ink:         #1a1a2a;
    --ink-mid:     #2e2e42;
    --ink-soft:    #4a4860;
    --ink-muted:   #8a8898;
    --gold:        #b8912a;
    --gold-light:  #e8c96e;
    --gold-dim:    rgba(184,145,42,0.12);
    --gold-mid:    rgba(184,145,42,0.35);
    --green:       #2d7a4f;
    --green-dim:   rgba(45,122,79,0.1);
    --red:         #a83232;
    --red-dim:     rgba(168,50,50,0.1);
    --blue:        #2a5a8a;
    --blue-dim:    rgba(42,90,138,0.1);
    --purple:      #6a3a8a;
    --purple-dim:  rgba(106,58,138,0.1);
    --teal:        #2a7a72;
    --teal-dim:    rgba(42,122,114,0.1);
    --radius:      12px;
    --radius-sm:   8px;
    --shadow:      0 4px 32px rgba(26,26,42,0.1);
    --shadow-lg:   0 8px 48px rgba(26,26,42,0.15);
    --border:      rgba(26,26,42,0.1);
    --border-gold: rgba(184,145,42,0.25);

    font-family: 'Source Serif 4', Georgia, serif;
    font-size: 15px;
    line-height: 1.7;
    color: var(--ink);
    background: var(--ivory);
    border-radius: 20px;
    max-width: 900px;
    margin: 32px auto;
    border: 1px solid var(--border-gold);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
    position: relative;
}

/* Top rule — gold line */
.iwc-wrap::before {
    content: '';
    display: block;
    height: 4px;
    background: linear-gradient(90deg, var(--gold) 0%, var(--gold-light) 50%, var(--gold) 100%);
}

/* ── Header ── */
.iwc-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 24px 32px 20px;
    border-bottom: 1px solid var(--border);
    background: linear-gradient(180deg, var(--ivory) 0%, var(--ivory-dark) 100%);
}
.iwc-header-left { display: flex; align-items: center; gap: 16px; }

.iwc-logo {
    width: 52px; height: 52px; border-radius: 14px;
    background: var(--ink);
    border: 1px solid var(--ink-mid);
    display: flex; align-items: center; justify-content: center;
    color: var(--gold-light);
    flex-shrink: 0;
    box-shadow: 0 4px 16px rgba(26,26,42,0.25);
}
.iwc-title {
    font-family: 'Playfair Display', Georgia, serif;
    font-size: 1.45rem; font-weight: 700;
    color: var(--ink); letter-spacing: -0.01em; line-height: 1.2;
}
.iwc-subtitle {
    font-size: 0.8rem; color: var(--ink-muted);
    font-style: italic; margin-top: 2px;
    font-family: 'Source Serif 4', Georgia, serif;
}
.iwc-band-target {
    display: flex; flex-direction: column; align-items: flex-end;
    gap: 2px;
}
.iwc-band-label {
    font-size: 0.65rem; font-weight: 600; letter-spacing: 0.12em;
    text-transform: uppercase; color: var(--ink-muted);
    font-family: 'DM Mono', monospace;
}
.iwc-band-num {
    font-family: 'Playfair Display', Georgia, serif;
    font-size: 1.1rem; font-weight: 700;
    color: var(--gold);
    background: var(--gold-dim);
    border: 1px solid var(--gold-mid);
    border-radius: 8px;
    padding: 4px 12px;
}

/* ── Task Tabs ── */
.iwc-task-tabs {
    display: flex;
    gap: 0;
    background: var(--ivory-dark);
    border-bottom: 1px solid var(--border);
}
.iwc-tab-btn {
    flex: 1; display: flex; flex-direction: column; align-items: center;
    gap: 2px; padding: 14px 20px;
    background: transparent; border: none;
    cursor: pointer; transition: all .2s;
    font-family: 'Source Serif 4', Georgia, serif;
    border-bottom: 3px solid transparent;
    color: var(--ink-muted);
    position: relative;
}
.iwc-tab-btn span:nth-child(2) { font-size: 0.92rem; font-weight: 600; color: var(--ink-soft); }
.iwc-tab-btn .iwc-tab-sub { font-size: 0.72rem; color: var(--ink-muted); font-style: italic; }
.iwc-tab-icon { font-size: 1.3rem; }
.iwc-tab-btn:hover { background: var(--ivory); }
.iwc-tab-btn.is-active {
    background: var(--ivory);
    border-bottom-color: var(--gold);
    color: var(--ink);
}
.iwc-tab-btn.is-active span:nth-child(2) { color: var(--ink); }

/* ── Writing Panel ── */
.iwc-writing-panel { padding: 28px 32px; }

.iwc-section-label {
    display: flex; align-items: center; justify-content: space-between;
    margin-bottom: 10px;
    font-family: 'DM Mono', monospace;
    font-size: 0.72rem; font-weight: 500;
    letter-spacing: 0.1em; text-transform: uppercase;
    color: var(--ink-muted);
}

/* ── Generate Prompt Button ── */
.iwc-gen-prompt-btn {
    display: inline-flex; align-items: center; gap: 6px;
    padding: 6px 14px; border-radius: var(--radius-sm);
    border: 1px solid var(--gold-mid);
    background: var(--gold-dim);
    color: var(--gold);
    font-family: 'Source Serif 4', Georgia, serif;
    font-size: 0.78rem; font-weight: 600;
    cursor: pointer; transition: all .18s;
}
.iwc-gen-prompt-btn:hover {
    background: rgba(184,145,42,0.2);
    box-shadow: 0 0 16px rgba(184,145,42,0.2);
}
.iwc-gen-prompt-btn:disabled { opacity: 0.45; cursor: not-allowed; }

/* ── Textareas ── */
.iwc-prompt-textarea,
.iwc-essay-textarea {
    width: 100%; border-radius: var(--radius-sm);
    border: 1px solid var(--border);
    background: #fff;
    color: var(--ink);
    font-family: 'Source Serif 4', Georgia, serif;
    font-size: 0.95rem; line-height: 1.8;
    padding: 16px 18px;
    resize: vertical; outline: none;
    transition: border-color .2s, box-shadow .2s;
    box-shadow: 0 2px 8px rgba(26,26,42,0.05);
}
.iwc-prompt-textarea:focus,
.iwc-essay-textarea:focus {
    border-color: var(--gold);
    box-shadow: 0 0 0 3px var(--gold-dim), 0 2px 8px rgba(26,26,42,0.05);
}
.iwc-prompt-textarea::placeholder,
.iwc-essay-textarea::placeholder { color: var(--ink-muted); font-style: italic; }

.iwc-prompt-section { margin-bottom: 20px; }
.iwc-essay-section  { margin-bottom: 20px; }

/* ── Word counter ── */
.iwc-word-counter {
    font-family: 'DM Mono', monospace;
    font-size: 0.78rem; color: var(--gold);
    background: var(--gold-dim);
    border: 1px solid var(--gold-mid);
    border-radius: 20px;
    padding: 3px 10px;
}

/* ── Tips bar ── */
.iwc-tips-bar {
    background: var(--ivory-dark);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 10px 14px;
    margin-top: 8px;
    font-size: 0.8rem; color: var(--ink-soft);
    font-style: italic;
}

/* ── Submit row ── */
.iwc-submit-row {
    display: flex; align-items: center; gap: 20px; flex-wrap: wrap;
}
.iwc-submit-btn {
    display: inline-flex; align-items: center; gap: 10px;
    padding: 14px 32px; border-radius: var(--radius);
    border: none;
    background: var(--ink);
    color: var(--gold-light);
    font-family: 'Playfair Display', Georgia, serif;
    font-size: 1rem; font-weight: 700;
    cursor: pointer; transition: all .22s;
    box-shadow: 0 4px 20px rgba(26,26,42,0.3);
    letter-spacing: 0.01em;
    position: relative; overflow: hidden;
}
.iwc-submit-btn::after {
    content: '';
    position: absolute; inset: 0;
    background: linear-gradient(135deg, transparent, rgba(232,201,110,0.08));
    opacity: 0; transition: opacity .2s;
}
.iwc-submit-btn:hover { transform: translateY(-2px); box-shadow: 0 8px 28px rgba(26,26,42,0.4); }
.iwc-submit-btn:hover::after { opacity: 1; }
.iwc-submit-btn:active { transform: translateY(0); }
.iwc-submit-btn:disabled { opacity: 0.45; cursor: not-allowed; transform: none; box-shadow: none; }

.iwc-spinner {
    display: flex; align-items: center; gap: 10px;
    color: var(--ink-soft); font-size: 0.88rem; font-style: italic;
}
.iwc-spin-ring {
    width: 20px; height: 20px;
    border: 2px solid var(--ivory-deep);
    border-top-color: var(--gold);
    border-radius: 50%;
    animation: iwc-spin 0.7s linear infinite;
}
@keyframes iwc-spin { to { transform: rotate(360deg); } }

.iwc-error-msg {
    padding: 12px 16px; border-radius: var(--radius-sm);
    background: var(--red-dim); border: 1px solid rgba(168,50,50,0.25);
    color: var(--red); font-size: 0.88rem; width: 100%;
}

/* ── Results ── */
.iwc-results {
    border-top: 1px solid var(--border);
    animation: iwc-fade-up 0.5s cubic-bezier(.16,1,.3,1);
}
@keyframes iwc-fade-up {
    from { opacity: 0; transform: translateY(16px); }
    to   { opacity: 1; transform: translateY(0); }
}

/* ── Score Banner ── */
.iwc-score-banner {
    padding: 32px;
    background: linear-gradient(160deg, var(--ink) 0%, var(--ink-mid) 100%);
    display: flex; flex-direction: column; gap: 24px;
}
.iwc-overall-score { display: flex; align-items: center; gap: 28px; }

.iwc-score-ring-wrap { position: relative; width: 120px; height: 120px; flex-shrink: 0; }
.iwc-ring-svg { width: 100%; height: 100%; transform: rotate(-90deg); }
.iwc-ring-track { fill: none; stroke: rgba(255,255,255,0.08); stroke-width: 10; }
.iwc-ring-fill  {
    fill: none; stroke: var(--gold);
    stroke-width: 10; stroke-linecap: round;
    transition: stroke-dashoffset 1.4s cubic-bezier(.4,0,.2,1);
    filter: drop-shadow(0 0 8px rgba(184,145,42,0.6));
}
.iwc-ring-inner {
    position: absolute; inset: 0;
    display: flex; flex-direction: column;
    align-items: center; justify-content: center;
}
.iwc-band-display {
    font-family: 'Playfair Display', Georgia, serif;
    font-size: 2rem; font-weight: 800;
    color: var(--gold-light); line-height: 1;
}
.iwc-band-word {
    font-family: 'DM Mono', monospace;
    font-size: 0.62rem; letter-spacing: 0.12em;
    text-transform: uppercase; color: rgba(255,255,255,0.4);
    margin-top: 2px;
}
.iwc-score-meta { flex: 1; }
.iwc-score-headline {
    font-family: 'DM Mono', monospace;
    font-size: 0.65rem; letter-spacing: 0.12em; text-transform: uppercase;
    color: rgba(255,255,255,0.4); margin-bottom: 8px;
}
.iwc-score-summary { color: rgba(255,255,255,0.8); font-size: 0.92rem; line-height: 1.7; font-style: italic; }
.iwc-wc-display {
    margin-top: 10px;
    font-family: 'DM Mono', monospace;
    font-size: 0.78rem; color: rgba(255,255,255,0.35);
}

/* ── Criteria grid ── */
.iwc-criteria-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(190px, 1fr));
    gap: 10px;
}
.iwc-criterion {
    background: rgba(255,255,255,0.05);
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: var(--radius-sm);
    padding: 14px 16px;
}
.iwc-crit-name {
    font-family: 'DM Mono', monospace;
    font-size: 0.65rem; letter-spacing: 0.08em;
    text-transform: uppercase; color: rgba(255,255,255,0.45);
    margin-bottom: 8px;
}
.iwc-crit-score-row { display: flex; align-items: center; gap: 10px; }
.iwc-crit-score {
    font-family: 'Playfair Display', Georgia, serif;
    font-size: 1.5rem; font-weight: 700; color: var(--gold-light);
    line-height: 1;
}
.iwc-crit-bar-wrap { flex: 1; height: 4px; background: rgba(255,255,255,0.1); border-radius: 2px; overflow: hidden; }
.iwc-crit-bar { height: 100%; background: var(--gold); border-radius: 2px; transition: width 1.2s cubic-bezier(.4,0,.2,1); width: 0; }
.iwc-crit-desc { font-size: 0.76rem; color: rgba(255,255,255,0.4); margin-top: 6px; font-style: italic; line-height: 1.4; }

/* ── Results Body ── */
.iwc-results-body { padding: 28px 32px; display: flex; flex-direction: column; gap: 0; }

.iwc-result-section {
    padding: 22px 0;
    border-bottom: 1px solid var(--border);
}
.iwc-result-section:last-child { border-bottom: none; }

.iwc-result-section-head {
    display: flex; align-items: center; gap: 12px; margin-bottom: 16px;
}
.iwc-section-icon {
    width: 28px; height: 28px; border-radius: 8px;
    display: flex; align-items: center; justify-content: center;
    font-size: 0.8rem; font-weight: 700; flex-shrink: 0;
}
.iwc-icon-green  { background: var(--green-dim);  color: var(--green);  border: 1px solid rgba(45,122,79,0.25); }
.iwc-icon-red    { background: var(--red-dim);    color: var(--red);    border: 1px solid rgba(168,50,50,0.25); }
.iwc-icon-gold   { background: var(--gold-dim);   color: var(--gold);   border: 1px solid var(--gold-mid); }
.iwc-icon-blue   { background: var(--blue-dim);   color: var(--blue);   border: 1px solid rgba(42,90,138,0.25); }
.iwc-icon-purple { background: var(--purple-dim); color: var(--purple); border: 1px solid rgba(106,58,138,0.25); }
.iwc-icon-teal   { background: var(--teal-dim);   color: var(--teal);   border: 1px solid rgba(42,122,114,0.25); }

.iwc-result-section-title {
    font-family: 'Playfair Display', Georgia, serif;
    font-size: 1rem; font-weight: 700; color: var(--ink);
    letter-spacing: -0.01em;
}

/* ── Strengths ── */
.iwc-strengths-list { list-style: none; display: flex; flex-direction: column; gap: 10px; }
.iwc-strengths-list li {
    display: flex; align-items: flex-start; gap: 12px;
    font-size: 0.92rem; color: var(--ink-soft); line-height: 1.6;
}
.iwc-strengths-list li::before {
    content: '✓'; flex-shrink: 0;
    width: 22px; height: 22px; border-radius: 50%;
    background: var(--green-dim); border: 1px solid rgba(45,122,79,0.25);
    color: var(--green); font-size: 0.72rem; font-weight: 700;
    display: flex; align-items: center; justify-content: center;
    margin-top: 1px;
}

/* ── Error cards ── */
.iwc-errors-list { display: flex; flex-direction: column; gap: 12px; }
.iwc-error-card {
    background: #fff; border: 1px solid var(--border);
    border-left: 3px solid var(--red);
    border-radius: var(--radius-sm); padding: 16px 18px;
    position: relative;
}
.iwc-error-type {
    display: inline-block; font-family: 'DM Mono', monospace;
    font-size: 0.62rem; letter-spacing: 0.1em; text-transform: uppercase;
    padding: 2px 8px; border-radius: 20px;
    background: var(--red-dim); color: var(--red);
    border: 1px solid rgba(168,50,50,0.2);
    margin-bottom: 10px;
}
.iwc-error-compare {
    display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-bottom: 10px;
}
.iwc-error-original, .iwc-error-corrected {
    padding: 10px 12px; border-radius: 6px; font-size: 0.88rem; line-height: 1.6;
    font-family: 'Source Serif 4', Georgia, serif;
}
.iwc-error-original {
    background: var(--red-dim); border: 1px solid rgba(168,50,50,0.15);
    color: var(--red); text-decoration: line-through; text-decoration-color: rgba(168,50,50,0.4);
}
.iwc-error-corrected {
    background: var(--green-dim); border: 1px solid rgba(45,122,79,0.2);
    color: var(--green);
}
.iwc-error-label {
    font-family: 'DM Mono', monospace; font-size: 0.62rem;
    letter-spacing: 0.08em; text-transform: uppercase;
    color: var(--ink-muted); margin-bottom: 4px;
}
.iwc-error-explanation { font-size: 0.84rem; color: var(--ink-soft); line-height: 1.65; }

/* ── Rewrites ── */
.iwc-rewrites-list { display: flex; flex-direction: column; gap: 14px; }
.iwc-rewrite-card {
    background: #fff; border: 1px solid var(--border-gold);
    border-radius: var(--radius-sm); padding: 18px;
    position: relative; overflow: hidden;
}
.iwc-rewrite-card::before {
    content: ''; position: absolute;
    top: 0; left: 0; right: 0; height: 2px;
    background: linear-gradient(90deg, var(--gold), var(--gold-light));
}
.iwc-rewrite-before, .iwc-rewrite-after {
    padding: 12px 14px; border-radius: 6px;
    font-size: 0.9rem; line-height: 1.75;
    font-family: 'Source Serif 4', Georgia, serif;
    margin-bottom: 8px;
}
.iwc-rewrite-before {
    background: var(--ivory-dark); border: 1px solid var(--border);
    color: var(--ink-soft); font-style: italic;
}
.iwc-rewrite-before-label, .iwc-rewrite-after-label {
    font-family: 'DM Mono', monospace; font-size: 0.6rem;
    letter-spacing: 0.1em; text-transform: uppercase;
    color: var(--ink-muted); margin-bottom: 4px;
}
.iwc-rewrite-after {
    background: var(--gold-dim); border: 1px solid var(--gold-mid);
    color: var(--ink);
}
.iwc-rewrite-after-label { color: var(--gold); }
.iwc-rewrite-why {
    font-size: 0.8rem; color: var(--ink-muted); font-style: italic;
    padding-top: 8px; border-top: 1px solid var(--border);
    line-height: 1.6;
}

/* ── Vocabulary ── */
.iwc-vocab-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 10px;
}
.iwc-vocab-card {
    background: #fff; border: 1px solid var(--border);
    border-radius: var(--radius-sm); padding: 14px 16px;
    transition: box-shadow .15s;
}
.iwc-vocab-card:hover { box-shadow: var(--shadow); }
.iwc-vocab-basic {
    font-size: 0.82rem; color: var(--ink-muted);
    text-decoration: line-through; margin-bottom: 4px;
    font-family: 'Source Serif 4', Georgia, serif;
}
.iwc-vocab-advanced {
    font-family: 'Playfair Display', Georgia, serif;
    font-size: 1.05rem; font-weight: 700; color: var(--blue);
    margin-bottom: 8px;
}
.iwc-vocab-example {
    font-size: 0.8rem; color: var(--ink-soft); line-height: 1.55; font-style: italic;
}

/* ── Structure text ── */
.iwc-structure-text {
    font-size: 0.92rem; color: var(--ink-soft); line-height: 1.8;
    background: #fff; border: 1px solid var(--border);
    border-radius: var(--radius-sm); padding: 18px;
    white-space: pre-line;
}

/* ── Model intro ── */
.iwc-model-intro-sec { background: var(--gold-dim); border-radius: var(--radius); padding: 22px; margin: 0 -0px; }
.iwc-model-intro {
    font-family: 'Source Serif 4', Georgia, serif;
    font-size: 0.95rem; line-height: 1.85; color: var(--ink);
    background: var(--ivory); border: 1px solid var(--gold-mid);
    border-radius: var(--radius-sm); padding: 18px 20px;
    font-style: italic;
    position: relative;
}
.iwc-model-intro::before {
    content: '"';
    position: absolute; top: -8px; left: 14px;
    font-family: 'Playfair Display', Georgia, serif;
    font-size: 3rem; color: var(--gold); opacity: 0.5; line-height: 1;
}

/* ── Steps ── */
.iwc-steps-list { list-style: none; display: flex; flex-direction: column; gap: 10px; counter-reset: steps; }
.iwc-steps-list li {
    display: flex; align-items: flex-start; gap: 12px;
    font-size: 0.92rem; color: var(--ink-soft); line-height: 1.6;
    counter-increment: steps;
}
.iwc-steps-list li::before {
    content: counter(steps);
    flex-shrink: 0; width: 24px; height: 24px; border-radius: 50%;
    background: var(--teal-dim); border: 1px solid rgba(42,122,114,0.3);
    color: var(--teal); font-size: 0.72rem; font-weight: 700;
    font-family: 'DM Mono', monospace;
    display: flex; align-items: center; justify-content: center;
    margin-top: 1px;
}

/* ── Retry row ── */
.iwc-retry-row {
    display: flex; justify-content: center;
    padding: 20px 32px 28px;
    border-top: 1px solid var(--border);
    background: var(--ivory-dark);
}
.iwc-retry-btn {
    display: inline-flex; align-items: center; gap: 8px;
    padding: 11px 26px; border-radius: 40px;
    border: 1px solid var(--border);
    background: var(--ivory); color: var(--ink-soft);
    font-family: 'Source Serif 4', Georgia, serif;
    font-size: 0.88rem; font-weight: 600;
    cursor: pointer; transition: all .2s;
}
.iwc-retry-btn:hover {
    border-color: var(--gold); color: var(--gold); background: var(--gold-dim);
}

/* ── Responsive ── */
@media (max-width: 640px) {
    .iwc-writing-panel { padding: 20px 18px; }
    .iwc-header { padding: 18px 18px 16px; flex-direction: column; align-items: flex-start; gap: 12px; }
    .iwc-score-banner { padding: 22px 18px; }
    .iwc-overall-score { flex-direction: column; text-align: center; }
    .iwc-results-body { padding: 20px 18px; }
    .iwc-criteria-grid { grid-template-columns: 1fr 1fr; }
    .iwc-error-compare { grid-template-columns: 1fr; }
    .iwc-vocab-grid { grid-template-columns: 1fr; }
    .iwc-retry-row { padding: 16px 18px 22px; }
}