/* InterviewLab — dark, code-centric UI */
:root {
  --bg: #0d1117;
  --bg-soft: #161b22;
  --bg-card: #1c2330;
  --border: #2d3748;
  --text: #e6edf3;
  --text-dim: #8b949e;
  --accent: #58e6c9;
  --accent-2: #7c8cff;
  --danger: #f47067;
  --warn: #d4a72c;
  --mono: 'JetBrains Mono', ui-monospace, monospace;
  --sans: 'Noto Sans SC', -apple-system, 'PingFang SC', sans-serif;
  --radius: 12px;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ---------- nav ---------- */
.nav {
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 28px; height: 60px;
  background: rgba(13,17,23,.85); backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  position: sticky; top: 0; z-index: 50;
}
.nav-brand {
  font-family: var(--mono); font-weight: 700; font-size: 18px; color: var(--text);
}
.nav-brand:hover { text-decoration: none; }
.brand-logo { color: var(--accent); margin-right: 4px; }
.nav-links { display: flex; align-items: center; gap: 20px; font-size: 14px; }
.nav-links a { color: var(--text-dim); }
.nav-links a:hover, .nav-links a.active { color: var(--text); text-decoration: none; }
.nav-cta {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #0d1117 !important; font-weight: 600;
  padding: 6px 16px; border-radius: 8px;
}
.nav-user { font-family: var(--mono); font-size: 13px; color: var(--accent); }

/* ---------- layout ---------- */
.container { flex: 1; width: 100%; max-width: 1100px; margin: 0 auto; padding: 32px 24px 64px; }
.footer { text-align: center; color: var(--text-dim); font-size: 13px; padding: 24px; border-top: 1px solid var(--border); }
.page-head { display: flex; align-items: center; justify-content: space-between; margin-bottom: 24px; }
.page-head h1 { font-size: 26px; margin: 0; }
.hidden { display: none !important; }
.hint { color: var(--text-dim); font-size: 13px; }

/* ---------- flash ---------- */
.flash-wrap { max-width: 1100px; margin: 16px auto 0; padding: 0 24px; }
.flash { padding: 10px 16px; border-radius: 8px; margin-bottom: 8px; font-size: 14px; }
.flash-success { background: rgba(88,230,201,.12); border: 1px solid rgba(88,230,201,.4); color: var(--accent); }
.flash-error { background: rgba(244,112,103,.12); border: 1px solid rgba(244,112,103,.4); color: var(--danger); }

/* ---------- buttons ---------- */
.btn {
  display: inline-block; border: 1px solid var(--border); border-radius: 8px;
  padding: 8px 18px; font-size: 14px; font-family: var(--sans); cursor: pointer;
  background: var(--bg-soft); color: var(--text); transition: all .15s ease;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn:disabled { opacity: .5; cursor: not-allowed; transform: none; }
.btn-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  border: none; color: #0d1117; font-weight: 600;
}
.btn-ghost { background: transparent; }
.btn-danger { background: transparent; border-color: var(--danger); color: var(--danger); }
.btn-lg { padding: 12px 28px; font-size: 15px; }
.btn-sm { padding: 4px 12px; font-size: 13px; }
.btn-block { width: 100%; }
.inline-form { display: inline; }

/* ---------- hero ---------- */
.hero { text-align: center; padding: 64px 0 40px; }
.hero-badge {
  display: inline-block; font-family: var(--mono); font-size: 12px; letter-spacing: 2px;
  color: var(--accent); border: 1px solid rgba(88,230,201,.4); border-radius: 999px;
  padding: 4px 14px; margin-bottom: 24px;
}
.hero h1 { font-size: 52px; line-height: 1.2; margin: 0 0 16px; font-weight: 700; }
.grad {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero-sub { color: var(--text-dim); font-size: 17px; margin-bottom: 32px; }
.hero-actions { display: flex; gap: 16px; justify-content: center; margin-bottom: 48px; }
.hero-stats { display: flex; gap: 48px; justify-content: center; }
.stat { display: flex; flex-direction: column; }
.stat-num { font-family: var(--mono); font-size: 30px; font-weight: 700; color: var(--accent); }
.stat-label { color: var(--text-dim); font-size: 13px; }

.features { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 20px; margin-top: 32px; }
.feature-card {
  background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 24px; transition: border-color .2s;
}
.feature-card:hover { border-color: var(--accent); }
.feature-icon { font-size: 26px; margin-bottom: 12px; color: var(--accent); }
.feature-card h3 { margin: 0 0 8px; font-size: 17px; }
.feature-card p { margin: 0; color: var(--text-dim); font-size: 14px; }

/* ---------- auth ---------- */
.auth-card {
  max-width: 420px; margin: 48px auto; background: var(--bg-card);
  border: 1px solid var(--border); border-radius: var(--radius); padding: 36px;
}
.auth-card h2 { margin: 0 0 4px; }
.auth-sub { color: var(--text-dim); font-size: 14px; margin: 0 0 24px; }
.auth-card label { display: block; margin-bottom: 16px; font-size: 14px; color: var(--text-dim); }
.auth-card input {
  width: 100%; margin-top: 6px; padding: 10px 12px; border-radius: 8px;
  border: 1px solid var(--border); background: var(--bg); color: var(--text); font-size: 14px;
}
.auth-card input:focus { outline: none; border-color: var(--accent); }
.auth-alt { text-align: center; font-size: 14px; color: var(--text-dim); margin-top: 20px; }

/* ---------- filter bar / tags ---------- */
.filter-bar { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; margin-bottom: 24px; }
.chip {
  padding: 5px 14px; border-radius: 999px; font-size: 13px;
  border: 1px solid var(--border); color: var(--text-dim); background: var(--bg-soft);
}
.chip:hover { text-decoration: none; color: var(--text); }
.chip-active { border-color: var(--accent); color: var(--accent); }
.search-form { margin-left: auto; }
.search-form input {
  padding: 7px 14px; border-radius: 999px; border: 1px solid var(--border);
  background: var(--bg-soft); color: var(--text); font-size: 13px; width: 200px;
}
.search-form input:focus { outline: none; border-color: var(--accent); }
.tag { font-size: 12px; padding: 2px 10px; border-radius: 999px; font-family: var(--mono); }
.tag-cat { background: rgba(124,140,255,.15); color: var(--accent-2); }
.tag-diff-easy { background: rgba(88,230,201,.15); color: var(--accent); }
.tag-diff-medium { background: rgba(212,167,44,.15); color: var(--warn); }
.tag-diff-hard { background: rgba(244,112,103,.15); color: var(--danger); }

/* ---------- question grid ---------- */
.question-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); gap: 20px; }
.question-card {
  background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 20px; display: flex; flex-direction: column; transition: border-color .2s, transform .15s;
}
.question-card:hover { border-color: var(--accent); transform: translateY(-2px); }
.question-card-top { display: flex; gap: 8px; margin-bottom: 10px; }
.question-title { margin: 0 0 8px; font-size: 17px; }
.question-preview { color: var(--text-dim); font-size: 13px; flex: 1; overflow: hidden; max-height: 110px; }
.question-card-actions { display: flex; gap: 8px; margin-top: 16px; align-items: center; }
.empty-state { text-align: center; padding: 80px 0; color: var(--text-dim); }
.empty-state p { font-size: 17px; margin-bottom: 20px; }

/* ---------- forms / editor ---------- */
.qform .form-row { display: flex; gap: 16px; margin-bottom: 20px; flex-wrap: wrap; }
.form-field { display: flex; flex-direction: column; font-size: 14px; color: var(--text-dim); }
.form-field.grow { flex: 1; min-width: 240px; }
.form-field input, .form-field select, .side-block select {
  margin-top: 6px; padding: 10px 12px; border-radius: 8px;
  border: 1px solid var(--border); background: var(--bg-soft); color: var(--text); font-size: 14px;
}
.form-field input:focus, .form-field select:focus { outline: none; border-color: var(--accent); }
.field-label { display: block; margin: 18px 0 8px; font-size: 14px; color: var(--text-dim); }
.form-actions { margin-top: 24px; display: flex; gap: 12px; }

/* EasyMDE dark theme overrides */
.editor-toolbar { background: var(--bg-soft); border-color: var(--border) !important; }
.editor-toolbar button { color: var(--text-dim) !important; }
.editor-toolbar button:hover, .editor-toolbar button.active { background: var(--bg-card) !important; border-color: var(--border) !important; }
.CodeMirror { background: var(--bg-soft); color: var(--text); border-color: var(--border) !important; border-radius: 0 0 10px 10px; font-family: var(--mono) !important; font-size: 14px; }
.CodeMirror-cursor { border-left-color: var(--accent); }
.editor-preview, .editor-preview-side { background: var(--bg); color: var(--text); }
.editor-statusbar { color: var(--text-dim); }
.cm-s-easymde .cm-header, .cm-s-easymde .cm-strong { color: var(--accent); }
.cm-s-easymde .cm-url, .cm-s-easymde .cm-link { color: var(--accent-2); }

/* ---------- practice ---------- */
.practice-layout { display: grid; grid-template-columns: 230px 1fr; gap: 24px; align-items: start; }
.practice-side {
  position: sticky; top: 84px; background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 18px; display: flex; flex-direction: column; gap: 18px;
}
.side-label { display: block; font-size: 12px; color: var(--text-dim); margin-bottom: 8px; font-family: var(--mono); letter-spacing: 1px; }
.mode-switch { display: flex; border: 1px solid var(--border); border-radius: 8px; overflow: hidden; }
.mode-btn, .input-mode-btn {
  flex: 1; padding: 7px 0; background: transparent; border: none; color: var(--text-dim);
  cursor: pointer; font-size: 13px; font-family: var(--sans);
}
.mode-btn.active, .input-mode-btn.active { background: rgba(88,230,201,.12); color: var(--accent); }
.practice-main { display: flex; flex-direction: column; gap: 20px; min-width: 0; }
.panel {
  background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); padding: 22px;
}
.panel-head { display: flex; align-items: center; justify-content: space-between; margin-bottom: 14px; }
.panel-title { font-family: var(--mono); font-size: 13px; letter-spacing: 1px; color: var(--text-dim); }
.q-meta { font-family: var(--mono); font-size: 13px; color: var(--accent-2); }
.q-title { margin: 0 0 14px; font-size: 22px; }
.answer-actions { display: flex; align-items: center; gap: 14px; margin-top: 14px; }
.plain-answer {
  width: 100%; min-height: 200px; padding: 14px; border-radius: 10px; resize: vertical;
  border: 1px solid var(--border); background: var(--bg-soft); color: var(--text);
  font-family: var(--mono); font-size: 14px;
}
.plain-answer:focus { outline: none; border-color: var(--accent); }

/* streaming output */
.thinking-box {
  border: 1px dashed rgba(124,140,255,.5); border-radius: 10px;
  background: rgba(124,140,255,.06); margin-bottom: 18px; overflow: hidden;
}
.thinking-head {
  padding: 8px 14px; font-size: 13px; color: var(--accent-2); font-family: var(--mono);
  border-bottom: 1px dashed rgba(124,140,255,.3);
}
.thinking-dot { display: inline-block; width: 8px; height: 8px; border-radius: 50%; background: var(--accent-2); animation: pulse 1s infinite; }
@keyframes pulse { 0%,100% { opacity: 1; } 50% { opacity: .25; } }
.thinking-content {
  padding: 12px 14px; font-family: var(--mono); font-size: 13px; color: var(--text-dim);
  white-space: pre-wrap; max-height: 220px; overflow-y: auto;
}
.ai-output { min-height: 40px; }
.ai-output.streaming::after {
  content: '▋'; color: var(--accent); animation: pulse .8s infinite;
}
.score-badge {
  font-family: var(--mono); font-size: 20px; font-weight: 700; padding: 4px 18px; border-radius: 999px;
}
.score-high, .score-badge.score-high { background: rgba(88,230,201,.15); color: var(--accent); }
.score-mid, .score-badge.score-mid { background: rgba(212,167,44,.15); color: var(--warn); }
.score-low, .score-badge.score-low { background: rgba(244,112,103,.15); color: var(--danger); }
.ref-divider {
  display: flex; align-items: center; gap: 14px; margin: 28px 0 16px;
  color: var(--accent-2); font-family: var(--mono); font-size: 13px; letter-spacing: 1px;
}
.ref-divider::before, .ref-divider::after { content: ''; flex: 1; height: 1px; background: var(--border); }
.result-actions { display: flex; gap: 12px; margin-top: 20px; }

/* ---------- markdown body ---------- */
.md-body { font-size: 15px; line-height: 1.75; word-break: break-word; }
.md-body h1, .md-body h2, .md-body h3 { border-bottom: 1px solid var(--border); padding-bottom: 6px; }
.md-body code { font-family: var(--mono); background: rgba(88,230,201,.1); color: var(--accent); padding: 2px 6px; border-radius: 5px; font-size: .9em; }
.md-body pre { background: #0a0e14; border: 1px solid var(--border); border-radius: 10px; padding: 16px; overflow-x: auto; }
.md-body pre code { background: none; color: var(--text); padding: 0; }
.md-body img { max-width: 100%; border-radius: 8px; border: 1px solid var(--border); }
.md-body blockquote { border-left: 3px solid var(--accent-2); margin-left: 0; padding: 4px 16px; color: var(--text-dim); background: rgba(124,140,255,.06); border-radius: 0 8px 8px 0; }
.md-body table { border-collapse: collapse; width: 100%; }
.md-body th, .md-body td { border: 1px solid var(--border); padding: 8px 12px; }
.md-body th { background: var(--bg-soft); }

/* ---------- history ---------- */
.history-stats { margin-bottom: 28px; }
.history-list { display: flex; flex-direction: column; gap: 10px; }
.history-row {
  display: flex; align-items: center; gap: 16px; padding: 14px 18px;
  background: var(--bg-card); border: 1px solid var(--border); border-radius: 10px;
  color: var(--text); transition: border-color .15s;
}
.history-row:hover { border-color: var(--accent); text-decoration: none; }
.history-score {
  font-family: var(--mono); font-weight: 700; font-size: 17px; width: 52px; text-align: center;
  padding: 4px 0; border-radius: 8px;
}
.history-title { flex: 1; font-size: 15px; }
.history-time { color: var(--text-dim); font-size: 13px; font-family: var(--mono); }
.detail-grid { display: flex; flex-direction: column; gap: 20px; }

@media (max-width: 860px) {
  .practice-layout { grid-template-columns: 1fr; }
  .practice-side { position: static; flex-direction: row; flex-wrap: wrap; }
  .hero h1 { font-size: 36px; }
  .hero-stats { gap: 24px; flex-wrap: wrap; }
}