/* Interview Prep — public UI styles */
:root {
    --ip-bg: #f5f7fa;
    --ip-panel: #fbfcfd;
    --ip-panel-2: #eef2f7;
    --ip-border: #e2e8f0;
    --ip-border-strong: #cbd5e1;
    --ip-text: #334155;
    --ip-muted: #64748b;
    --ip-accent: #0f766e;         /* teal-700 — distinct from CodeArena violet */
    --ip-accent-hover: #0d9488;   /* teal-600 */
    --ip-accent-soft: #f0fdfa;    /* teal-50 */
    --ip-on-accent: #ffffff;
    --ip-strong: #16a34a;
    --ip-strong-soft: #dcfce7;
    --ip-adequate: #d97706;
    --ip-adequate-soft: #fef3c7;
    --ip-needs-work: #dc2626;
    --ip-needs-work-soft: #fee2e2;
    --ip-pill-lang: #0f766e;
    --ip-pill-level: #7c3aed;
    --ip-pill-type: #2563eb;
    --ip-pill-freq: #475569;
    --ip-pill-tag: #64748b;
    --ip-pill-done: #16a34a;
    --ip-shadow: 0 1px 3px rgba(15,23,42,0.06);
    --ip-radius: 8px;
}

[data-theme="dark"] {
    --ip-bg: #0d1117;
    --ip-panel: #161b22;
    --ip-panel-2: #1c222b;
    --ip-border: #30363d;
    --ip-border-strong: #4b5563;
    --ip-text: #e6edf3;
    --ip-muted: #9ca3af;
    --ip-accent: #2dd4bf;
    --ip-accent-hover: #5eead4;
    --ip-accent-soft: rgba(45,212,191,0.12);
    --ip-on-accent: #022c22;
    --ip-strong: #3fb950;
    --ip-strong-soft: rgba(63,185,80,0.15);
    --ip-adequate: #d29922;
    --ip-adequate-soft: rgba(210,153,34,0.15);
    --ip-needs-work: #f85149;
    --ip-needs-work-soft: rgba(248,81,73,0.12);
    --ip-pill-lang: #2dd4bf;
    --ip-pill-level: #a78bfa;
    --ip-pill-type: #79c0ff;
    --ip-pill-freq: #9ca3af;
    --ip-pill-tag: #8b949e;
    --ip-pill-done: #3fb950;
    --ip-shadow: none;
}

/* ---- Layout shell ---- */
.ip-shell {
    display: block !important;
    width: 100% !important;
    max-width: 900px !important;
    margin: 24px auto !important;
    padding: 0 16px !important;
    box-sizing: border-box !important;
    color: var(--ip-text);
    overflow-x: clip;
}
.ip-quiz-shell { max-width: 1100px !important; }

/* ---- Hero ---- */
.ip-hero {
    text-align: center;
    padding: 40px 0 32px;
    border-bottom: 1px solid var(--ip-border);
    margin-bottom: 24px;
}
.ip-hero h1 {
    font-size: clamp(1.6rem, 4vw, 2.4rem);
    font-weight: 700;
    margin: 0 0 8px;
}
.ip-hero-sub {
    color: var(--ip-muted);
    margin: 0 0 20px;
    font-size: 1.05rem;
}
.ip-cta-btn {
    display: inline-block;
    background: var(--ip-accent);
    color: var(--ip-on-accent) !important;
    font-weight: 600;
    padding: 10px 22px;
    border-radius: var(--ip-radius);
    text-decoration: none;
    border: none;
    cursor: pointer;
    font-size: 0.95rem;
    transition: background 0.15s;
}
.ip-cta-btn:hover { background: var(--ip-accent-hover); }
.ip-cta-secondary { background: var(--ip-panel-2); color: var(--ip-text) !important; border: 1px solid var(--ip-border); }
.ip-cta-secondary:hover { background: var(--ip-border); }

/* ---- Filter bar ---- */
.ip-filters {
    display: flex;
    flex-wrap: wrap;
    gap: 12px 20px;
    padding: 16px 0;
    border-bottom: 1px solid var(--ip-border);
    margin-bottom: 28px;
}
.ip-filter-group {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 6px;
}
.ip-filter-label {
    font-size: 0.78rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--ip-muted);
    margin-right: 4px;
}
.ip-filter-chip {
    display: inline-block;
    padding: 4px 12px;
    border-radius: 99px;
    background: var(--ip-panel-2);
    border: 1px solid var(--ip-border);
    color: var(--ip-text);
    font-size: 0.82rem;
    text-decoration: none;
    transition: background 0.12s, border-color 0.12s;
}
.ip-filter-chip:hover { background: var(--ip-accent-soft); border-color: var(--ip-accent); color: var(--ip-accent); }
.ip-filter-chip.active { background: var(--ip-accent); border-color: var(--ip-accent); color: var(--ip-on-accent); }

/* ---- Pill tags ---- */
.ip-pill {
    display: inline-block;
    padding: 2px 8px;
    border-radius: 99px;
    font-size: 0.75rem;
    font-weight: 500;
    line-height: 1.5;
}
.ip-pill-lang     { background: color-mix(in srgb, var(--ip-pill-lang) 12%, transparent);  color: var(--ip-pill-lang); }
.ip-pill-level    { background: color-mix(in srgb, var(--ip-pill-level) 12%, transparent); color: var(--ip-pill-level); }
.ip-pill-type     { background: color-mix(in srgb, var(--ip-pill-type) 12%, transparent);  color: var(--ip-pill-type); }
.ip-pill-freq     { background: var(--ip-panel-2); color: var(--ip-pill-freq); border: 1px solid var(--ip-border); }
.ip-pill-tag      { background: var(--ip-panel-2); color: var(--ip-pill-tag); border: 1px solid var(--ip-border); }
.ip-pill-done     { background: var(--ip-strong-soft); color: var(--ip-strong); }

/* ---- Question list ---- */
.ip-lang-section { margin-bottom: 36px; }
.ip-lang-heading {
    font-size: 1.25rem;
    font-weight: 700;
    border-bottom: 2px solid var(--ip-accent);
    padding-bottom: 6px;
    margin: 0 0 16px;
    color: var(--ip-accent);
}
.ip-level-group { margin-bottom: 24px; }
.ip-level-heading {
    font-size: 0.9rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--ip-muted);
    margin: 0 0 10px;
}
.ip-question-list { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 8px; }
.ip-question-card {
    background: var(--ip-panel);
    border: 1px solid var(--ip-border);
    border-radius: var(--ip-radius);
    padding: 14px 18px;
    box-shadow: var(--ip-shadow);
    transition: border-color 0.12s;
}
.ip-question-card:hover { border-color: var(--ip-accent); }
.ip-question-card.attempted { border-left: 3px solid var(--ip-strong); }
.ip-question-title {
    display: block;
    font-weight: 600;
    color: var(--ip-text);
    text-decoration: none;
    margin-bottom: 8px;
    font-size: 0.97rem;
}
.ip-question-title:hover { color: var(--ip-accent); }
.ip-question-meta { display: flex; flex-wrap: wrap; gap: 5px; align-items: center; }
.ip-empty { color: var(--ip-muted); padding: 40px 0; text-align: center; }

/* ---- Single question page ---- */
.ip-question-page { max-width: 820px !important; }
.ip-breadcrumb {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.82rem;
    color: var(--ip-muted);
    margin-bottom: 20px;
}
.ip-breadcrumb a { color: var(--ip-muted); text-decoration: none; }
.ip-breadcrumb a:hover { color: var(--ip-accent); }
.ip-question-header { margin-bottom: 28px; }
.ip-question-header h1 { font-size: clamp(1.3rem, 3.5vw, 1.9rem); margin: 10px 0 6px; }
.ip-question-pills { display: flex; flex-wrap: wrap; gap: 5px; margin-bottom: 10px; }
.ip-question-id { font-size: 0.78rem; color: var(--ip-muted); margin: 0; }

.ip-quiz-section { margin-bottom: 28px; }
.ip-quiz-section h2 { font-size: 1rem; font-weight: 700; margin: 0 0 8px; }
.ip-quiz-hint { font-size: 0.85rem; color: var(--ip-muted); margin: 0 0 10px; }
.ip-quiz-section textarea,
.ip-quiz-shell textarea {
    width: 100%;
    box-sizing: border-box;
    padding: 12px 14px;
    border: 1px solid var(--ip-border);
    border-radius: var(--ip-radius);
    background: var(--ip-panel);
    color: var(--ip-text);
    font-family: inherit;
    font-size: 0.9rem;
    resize: vertical;
    transition: border-color 0.12s;
}
.ip-quiz-section textarea:focus,
.ip-quiz-shell textarea:focus { outline: none; border-color: var(--ip-accent); }
.ip-quiz-actions { display: flex; align-items: center; gap: 16px; margin-top: 12px; flex-wrap: wrap; }
.ip-quiz-note { font-size: 0.82rem; color: var(--ip-muted); }
.ip-quiz-note a { color: var(--ip-accent); }

.ip-answer-block { border-top: 1px solid var(--ip-border); padding-top: 28px; }
.ip-model-answer h2,
.ip-code-section h2,
.ip-followup-section h2,
.ip-related h2 { font-size: 1rem; font-weight: 700; margin: 0 0 10px; }
.ip-model-answer { margin-bottom: 28px; }
.ip-answer-text {
    line-height: 1.75;
    font-size: 0.95rem;
    margin: 0;
    white-space: pre-wrap;
}
.ip-code-section {
    background: var(--ip-panel-2);
    border: 1px solid var(--ip-border);
    border-radius: var(--ip-radius);
    padding: 20px;
    margin-bottom: 28px;
    overflow-x: auto;
}
.ip-code-section pre { margin: 0; }
.ip-code-section code { font-size: 0.85rem; }
.ip-followup-section { margin-bottom: 28px; }
.ip-followup-text {
    border-left: 3px solid var(--ip-accent);
    margin: 0;
    padding: 12px 16px;
    background: var(--ip-accent-soft);
    border-radius: 0 var(--ip-radius) var(--ip-radius) 0;
    font-size: 0.92rem;
    white-space: pre-wrap;
}
.ip-related { margin-bottom: 28px; }
.ip-related-list { padding-left: 20px; font-size: 0.88rem; color: var(--ip-muted); }
.ip-related-list li { margin-bottom: 4px; }

/* ---- Self-score ---- */
.ip-self-score { margin-bottom: 28px; }
.ip-self-score h2, .ip-self-score h3 { font-size: 1rem; font-weight: 700; margin: 0 0 12px; }
.ip-score-options { display: flex; gap: 10px; flex-wrap: wrap; }
.ip-score-btn {
    padding: 8px 18px;
    border-radius: var(--ip-radius);
    border: 1px solid var(--ip-border);
    background: var(--ip-panel);
    color: var(--ip-text);
    font-size: 0.88rem;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.12s, border-color 0.12s, color 0.12s;
}
.ip-score-btn:hover { border-color: var(--ip-accent); color: var(--ip-accent); }
.ip-score-btn[data-score="Strong"]:hover,
.ip-score-btn.selected-strong { background: var(--ip-strong-soft); border-color: var(--ip-strong); color: var(--ip-strong); }
.ip-score-btn[data-score="Adequate"]:hover,
.ip-score-btn.selected-adequate { background: var(--ip-adequate-soft); border-color: var(--ip-adequate); color: var(--ip-adequate); }
.ip-score-btn[data-score="NeedsWork"]:hover,
.ip-score-btn.selected-needswork { background: var(--ip-needs-work-soft); border-color: var(--ip-needs-work); color: var(--ip-needs-work); }
.ip-score-confirm { font-size: 0.85rem; color: var(--ip-muted); margin: 10px 0 0; }

/* ---- Prev / Next nav ---- */
.ip-prev-next {
    display: flex;
    justify-content: space-between;
    padding-top: 24px;
    border-top: 1px solid var(--ip-border);
    margin-top: 8px;
}
.ip-nav-btn {
    display: inline-block;
    padding: 8px 16px;
    border-radius: var(--ip-radius);
    border: 1px solid var(--ip-border);
    color: var(--ip-text);
    font-size: 0.88rem;
    text-decoration: none;
    transition: border-color 0.12s, color 0.12s;
}
.ip-nav-btn:hover { border-color: var(--ip-accent); color: var(--ip-accent); }

/* ---- Quiz mode layout ---- */
.ip-quiz-header { text-align: center; padding: 32px 0 20px; }
.ip-quiz-header h1 { font-size: clamp(1.4rem, 3.5vw, 2rem); font-weight: 700; margin: 0 0 6px; }
.ip-quiz-sub { color: var(--ip-muted); margin: 0; font-size: 0.95rem; }
.ip-quiz-filters {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 6px;
    padding: 12px 0 16px;
    border-bottom: 1px solid var(--ip-border);
    margin-bottom: 24px;
}
.ip-filter-sep { color: var(--ip-border-strong); font-size: 1.1rem; margin: 0 4px; }
.ip-quiz-layout {
    display: grid;
    grid-template-columns: 1fr 240px;
    gap: 28px;
    align-items: start;
}
@media (max-width: 680px) {
    .ip-quiz-layout { grid-template-columns: 1fr; }
}
.ip-quiz-main {
    background: var(--ip-panel);
    border: 1px solid var(--ip-border);
    border-radius: var(--ip-radius);
    padding: 28px 24px;
    box-shadow: var(--ip-shadow);
}
.ip-quiz-question-pills { display: flex; flex-wrap: wrap; gap: 5px; margin-bottom: 14px; }
.ip-quiz-question-title { font-size: clamp(1.05rem, 2.5vw, 1.35rem); font-weight: 700; margin: 0 0 20px; }
.ip-quiz-step { }
.ip-quiz-instruction { font-size: 0.85rem; color: var(--ip-muted); margin: 0 0 10px; }
.ip-quiz-reveal-btn,
.ip-quiz-next-actions { margin-top: 16px; display: flex; gap: 12px; align-items: center; flex-wrap: wrap; }
.ip-quiz-detail-link { font-size: 0.82rem; color: var(--ip-muted); text-decoration: none; }
.ip-quiz-detail-link:hover { color: var(--ip-accent); }
.ip-quiz-login-note { font-size: 0.85rem; color: var(--ip-muted); margin: 14px 0 0; }
.ip-quiz-login-note a { color: var(--ip-accent); }
.ip-quiz-model-answer {
    padding: 20px;
    background: var(--ip-panel-2);
    border-radius: var(--ip-radius);
    border: 1px solid var(--ip-border);
    margin-bottom: 24px;
}
.ip-quiz-model-answer h3 { font-size: 0.95rem; font-weight: 700; margin: 0 0 10px; }
.ip-quiz-model-answer p { font-size: 0.9rem; line-height: 1.75; margin: 0 0 14px; white-space: pre-wrap; }
.ip-quiz-model-answer pre {
    background: var(--ip-panel);
    border: 1px solid var(--ip-border);
    border-radius: 6px;
    padding: 14px;
    overflow-x: auto;
    font-size: 0.82rem;
    margin: 0 0 14px;
}
.ip-quiz-model-answer blockquote {
    border-left: 3px solid var(--ip-accent);
    margin: 0;
    padding: 10px 14px;
    background: var(--ip-accent-soft);
    border-radius: 0 6px 6px 0;
    font-size: 0.88rem;
    white-space: pre-wrap;
}
.ip-loading { color: var(--ip-muted); font-size: 0.88rem; }

/* ---- Progress sidebar ---- */
.ip-quiz-sidebar {
    background: var(--ip-panel);
    border: 1px solid var(--ip-border);
    border-radius: var(--ip-radius);
    padding: 20px 18px;
    box-shadow: var(--ip-shadow);
}
.ip-quiz-sidebar h3 { font-size: 0.9rem; font-weight: 700; margin: 0 0 14px; }
.ip-progress-stat { text-align: center; margin-bottom: 16px; }
.ip-stat-num { display: block; font-size: 2rem; font-weight: 700; color: var(--ip-accent); line-height: 1; }
.ip-stat-label { font-size: 0.78rem; color: var(--ip-muted); text-transform: uppercase; letter-spacing: 0.05em; }
.ip-progress-breakdown { margin-bottom: 14px; }
.ip-breakdown-row {
    display: flex;
    justify-content: space-between;
    font-size: 0.85rem;
    padding: 5px 8px;
    border-radius: 6px;
    margin-bottom: 4px;
}
.ip-strong    { background: var(--ip-strong-soft); color: var(--ip-strong); }
.ip-adequate  { background: var(--ip-adequate-soft); color: var(--ip-adequate); }
.ip-needs-work { background: var(--ip-needs-work-soft); color: var(--ip-needs-work); }
.ip-by-lang { margin-bottom: 14px; }
.ip-lang-row {
    display: flex;
    justify-content: space-between;
    font-size: 0.83rem;
    color: var(--ip-muted);
    padding: 3px 0;
    border-bottom: 1px solid var(--ip-border);
}
.ip-sidebar-browse {
    display: block;
    text-align: center;
    font-size: 0.82rem;
    color: var(--ip-accent);
    text-decoration: none;
    margin-top: 12px;
}
.ip-sidebar-browse:hover { text-decoration: underline; }

@media (max-width: 600px) {
    .ip-shell { margin: 16px auto !important; }
    .ip-hero { padding: 24px 0 20px; }
    .ip-filters { gap: 8px; }
    .ip-quiz-main { padding: 18px 14px; }
}