:root {
    --bg: #f8fafc;
    --panel: #ffffff;
    --text: #111827;
    --muted: #6b7280;
    --border: #e5e7eb;
    --blue: #1d4ed8;
    --green: #16a34a;
    --red: #dc2626;
    --shadow: 0 10px 25px rgba(0, 0, 0, 0.08);
    --mono: Consolas, "Fira Code", ui-monospace, SFMono-Regular, Menlo, Monaco, monospace;
    --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Arial, sans-serif;
}

* { box-sizing: border-box; }

/* ✅ fixed-height column layout */
html, body { height: 100%; }

body {
    margin: 0;
    font-family: var(--sans);
    background: var(--bg);
    color: var(--text);

    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.dr-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 14px 22px;
    background: var(--panel);
    border-bottom: 1px solid var(--border);
    flex: 0 0 auto;
}

.dr-header-left {
    display: flex;
    align-items: center;
    gap: 12px;
}

.dr-logo { height: 30px; }

.dr-title {
    font-size: 1.05rem;
    font-weight: 700;
}

.dr-header-right {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: 6px;
}

.dr-badge {
    padding: 5px 10px;
    border-radius: 999px;
    border: 1px solid #bbf7d0;
    background: #f0fdf4;
    color: #166534;
    font-size: 0.78rem;
    font-weight: 700;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

.dr-candidate-display {
    font-size: 0.9rem;
    color: var(--muted);
}

.dr-session-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding: 10px 22px;
    background: var(--panel);
    border-bottom: 1px solid var(--border);
    flex: 0 0 auto;
}

.dr-session-status {
    color: var(--muted);
    font-size: 0.9rem;
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.dr-recording-status {
    font-size: 0.85rem;
    color: var(--muted);
}

.dr-recording-status.on {
    color: var(--red);
    font-weight: 700;
}

.dr-session-link-block {
    flex: 2;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

.dr-session-label {
    font-size: 0.85rem;
    color: var(--muted);
}

#session-link {
    width: 100%;
    max-width: 520px;
    padding: 7px 10px;
    border-radius: 8px;
    border: 1px solid var(--border);
    background: #f9fafb;
    color: #374151;
    font-size: 0.85rem;
}

.dr-session-actions {
    display: flex;
    align-items: center;
    gap: 10px;
    flex: 1;
    justify-content: flex-end;
    flex-wrap: wrap;
}

.dr-link {
    font-size: 0.85rem;
    color: var(--blue);
    text-decoration: none;
}
.dr-link:hover { text-decoration: underline; }

/* ✅ Main fills remaining height */
.dr-main {
    display: flex;
    flex: 1 1 auto;
    min-height: 0;
}

.dr-left {
    flex: 3;
    padding: 14px 18px;
    display: flex;
    flex-direction: column;
    gap: 10px;
    min-height: 0;
}

.dr-right {
    flex: 2;
    padding: 14px 18px;
    border-left: 1px solid var(--border);
    background: #fbfdff;

    display: flex;
    flex-direction: column;
    gap: 10px;
    min-height: 0;
    overflow: hidden;
}

.dr-toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
}

.dr-toolbar-left {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--muted);
    font-size: 0.9rem;
}

#language {
    padding: 7px 10px;
    border-radius: 8px;
    border: 1px solid var(--border);
    background: var(--panel);
    color: var(--text);
}

.dr-buttons {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
}

button {
    border: 1px solid var(--border);
    background: var(--panel);
    color: var(--text);
    padding: 7px 12px;
    border-radius: 10px;
    font-weight: 650;
    cursor: pointer;
    box-shadow: 0 1px 0 rgba(0, 0, 0, 0.03);
}
button:hover { border-color: #cbd5e1; }
button:disabled { opacity: 0.55; cursor: not-allowed; }

button#run {
    background: var(--green);
    border-color: #16a34a;
    color: #ffffff;
}

button#hint {
    background: #eff6ff;
    border-color: #bfdbfe;
    color: #1d4ed8;
}

/* ✅ Editor area now hosts Monaco */
.dr-editor-wrap {
    flex: 1;
    display: flex;
    border: 1px solid var(--border);
    border-radius: 12px;
    overflow: hidden;
    background: #ffffff;
    box-shadow: var(--shadow);
    min-height: 0;
}

/* Monaco container */
.dr-monaco {
    flex: 1;
    min-height: 0;
}

/* Fallback textarea */
#editor-textarea {
    flex: 1;
    border: none;
    padding: 12px 12px;
    font-family: var(--mono);
    font-size: 0.95rem;
    line-height: 1.35rem;
    outline: none;
    resize: none;
    background: #ffffff;
    color: #111827;
    height: 100%;
    min-height: 0;
}

/* Right headings */
.dr-right h3 {
    margin: 0;
    font-size: 0.95rem;
    color: #111827;
    flex: 0 0 auto;
}

/* ✅ Challenge box: wraps, no scroll, clamps lines */
#challenge-box {
    flex: 0 0 auto;
    min-height: 0;

    white-space: pre-wrap;
    word-break: break-word;

    line-height: 1.35rem;
    max-height: calc(1.35rem * 8);

    overflow: hidden;

    display: -webkit-box;
    -webkit-line-clamp: 8;
    -webkit-box-orient: vertical;
}

/* ✅ Output takes remaining space and scrolls */
#output {
    flex: 1 1 auto;
    min-height: 0;
    margin: 0;
    padding: 12px;
    border-radius: 12px;
    border: 1px solid var(--border);
    background: #ffffff;
    box-shadow: var(--shadow);
    font-family: var(--mono);
    font-size: 0.92rem;
    line-height: 1.35rem;

    overflow: auto;
    white-space: pre-wrap;
    word-break: break-word;
}

/* ===== Processing pill ===== */
.dr-processing {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 10px;
    border-radius: 999px;
    border: 1px solid #c7d2fe;
    background: #eef2ff;
    color: #1d4ed8;
    font-size: 0.85rem;
    font-weight: 700;
}

.dr-spinner {
    width: 12px;
    height: 12px;
    border-radius: 999px;
    border: 2px solid #cbd5e1;
    border-top-color: #1d4ed8;
    animation: drspin 0.9s linear infinite;
}

@keyframes drspin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

/* ===== Candidate name modal ===== */
.dr-modal {
    position: fixed;
    inset: 0;
    background: rgba(15, 23, 42, 0.55);
    display: none;
    align-items: center;
    justify-content: center;
    padding: 16px;
    z-index: 9999;
}
.dr-modal.show {
    display: flex;
}

.dr-modal-card {
    width: 100%;
    max-width: 520px;
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 18px;
    box-shadow: var(--shadow);
}

.dr-modal-title {
    font-size: 1.05rem;
    font-weight: 800;
    margin-bottom: 6px;
}

.dr-modal-sub {
    font-size: 0.9rem;
    color: var(--muted);
    margin-bottom: 14px;
}

.dr-modal-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}

.dr-field-label {
    display: block;
    font-size: 0.85rem;
    color: var(--muted);
    margin-bottom: 6px;
}

#cand-first,
#cand-last {
    width: 100%;
    padding: 9px 10px;
    border-radius: 10px;
    border: 1px solid var(--border);
    background: #ffffff;
    color: var(--text);
    font-size: 0.95rem;
}

.dr-modal-actions {
    display: flex;
    justify-content: flex-end;
    margin-top: 14px;
}

.dr-primary {
    background: var(--blue);
    border-color: var(--blue);
    color: #ffffff;
}

.dr-modal-hint {
    margin-top: 10px;
    font-size: 0.85rem;
    color: #b91c1c;
}

/* ===== Solve modal (iframe) ===== */
.dr-solve-modal {
    background: rgba(0, 0, 0, 0.75);
}

.dr-solve-card {
    max-width: 1200px;
    width: 95vw;
    height: 88vh;
    padding: 12px;
    border-radius: 16px;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.dr-solve-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    flex: 0 0 auto;
}

.dr-solve-title {
    font-weight: 800;
    font-size: 0.95rem;
    color: #111827;
}

.dr-solve-close {
    padding: 7px 12px;
    border-radius: 10px;
}

.dr-solve-frame {
    flex: 1 1 auto;
    min-height: 0;
    border: 1px solid var(--border);
    border-radius: 12px;
    width: 100%;
    background: #000;
}