/* Math Practice Design System */
@import url('https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@400;500;600;700&family=Geist:wght@400;500;600;700&display=swap');

:root {
  --background: #F2F3F0;
  --foreground: #111111;
  --card: #FFFFFF;
  --card-foreground: #111111;
  --primary: #FF8400;
  --primary-hover: #E67700;
  --primary-foreground: #111111;
  --secondary: #E7E8E5;
  --secondary-foreground: #111111;
  --muted: #F2F3F0;
  --muted-foreground: #666666;
  --border: #CBCCC9;
  --input: #CBCCC9;
  --destructive: #D93C15;
  --ring: #666666;

  --color-error: #E5DCDA;
  --color-error-foreground: #8C1C00;
  --color-success: #DFE6E1;
  --color-success-foreground: #004D1A;
  --color-warning: #E9E3D8;
  --color-warning-foreground: #804200;
  --color-info: #DFDFE6;
  --color-info-foreground: #000066;

  --sidebar: #E7E8E5;
  --sidebar-accent: #CBCCC9;
  --sidebar-accent-foreground: #18181b;
  --sidebar-border: #CBCCC9;
  --sidebar-foreground: #666666;

  --radius-m: 16px;
  --radius-pill: 999px;

  --font-primary: 'JetBrains Mono', monospace;
  --font-secondary: 'Geist', -apple-system, BlinkMacSystemFont, sans-serif;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: var(--font-secondary);
  color: var(--foreground);
  background: var(--background);
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
}

a { color: inherit; text-decoration: none; }

/* ── Buttons ── */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  height: 40px; padding: 0 24px; border-radius: var(--radius-pill);
  font-family: var(--font-primary); font-size: 14px; font-weight: 500;
  cursor: pointer; transition: all 0.15s ease; border: none;
}
.btn-primary { background: var(--primary); color: var(--foreground); }
.btn-primary:hover { background: var(--primary-hover); }
.btn-primary:disabled { opacity: 0.5; cursor: not-allowed; }
.btn-outline {
  background: var(--background); border: 1px solid var(--border); color: var(--foreground);
  box-shadow: 0 1px 1.75px #0000000d;
}
.btn-outline:hover { background: var(--secondary); }
.btn-ghost { background: none; border: none; color: var(--foreground); padding: 0 16px; }
.btn-ghost:hover { background: var(--secondary); }
.btn-danger { background: var(--destructive); color: #fff; }
.btn-danger:hover { opacity: 0.9; }
.btn-sm { height: 32px; padding: 0 16px; font-size: 12px; }
.btn-lg { height: 48px; padding: 0 32px; font-size: 16px; }

/* ── Cards ── */
.card {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius-m);
  box-shadow: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
  padding: 24px;
}

/* ── Badges ── */
.badge {
  display: inline-flex; align-items: center;
  font-family: var(--font-secondary); font-size: 12px; font-weight: 700;
  padding: 4px 12px; border-radius: var(--radius-pill); width: fit-content;
}
.badge-primary { background: var(--primary); color: var(--foreground); }
.badge-success { background: var(--color-success); color: var(--color-success-foreground); }
.badge-warning { background: var(--color-warning); color: var(--color-warning-foreground); }
.badge-error { background: var(--color-error); color: var(--color-error-foreground); }
.badge-info { background: var(--color-info); color: var(--color-info-foreground); }
.badge-secondary { background: var(--secondary); color: var(--foreground); }

/* ── Form ── */
.form-group { display: flex; flex-direction: column; gap: 6px; }
.form-group label { font-size: 14px; font-weight: 500; color: var(--foreground); }
.form-group input, .form-group select {
  height: 40px; background: var(--muted); border: 1px solid var(--border);
  border-radius: var(--radius-pill); padding: 0 16px;
  font-family: var(--font-secondary); font-size: 14px; color: var(--foreground); outline: none;
  transition: border-color 0.15s ease;
}
.form-group input::placeholder { color: #999; }
.form-group input:focus, .form-group select:focus { border-color: var(--primary); }

/* ── Progress Bar ── */
.progress-bar { width: 100%; height: 8px; background: var(--secondary); border-radius: var(--radius-pill); overflow: hidden; }
.progress-bar .fill { height: 100%; border-radius: var(--radius-pill); background: var(--primary); transition: width 0.3s ease; }

/* ── Metric Card ── */
.metric-card {
  flex: 1; background: var(--card); border: 1px solid var(--border);
  padding: 20px 24px; display: flex; flex-direction: column; gap: 4px;
  box-shadow: 0 1px 1.75px #0000000d; border-radius: var(--radius-m);
}
.metric-label { font-size: 13px; color: var(--muted-foreground); }
.metric-value { font-family: var(--font-primary); font-size: 28px; font-weight: 700; color: var(--foreground); }
.metric-sub { font-size: 13px; color: var(--muted-foreground); }
.metric-sub.success { color: var(--color-success-foreground); }
.metric-sub.warning { color: var(--color-warning-foreground); }

/* ── Login Page ── */
.login-page { display: flex; min-height: 100vh; }
.login-left {
  flex: 1; background: var(--primary); display: flex; flex-direction: column;
  align-items: center; justify-content: center; padding: 48px; gap: 32px;
}
.login-left h1 { font-family: var(--font-primary); font-size: 28px; font-weight: 700; color: #fff; text-align: center; }
.login-left p { font-size: 16px; color: rgba(255,255,255,0.8); text-align: center; }
.login-left .icon-big { width: 64px; height: 64px; color: #fff; }
.bullet-list { list-style: none; display: flex; flex-direction: column; gap: 16px; }
.bullet-item { display: flex; align-items: center; gap: 12px; font-size: 14px; color: #fff; }
.bullet-item .lucide { width: 20px; height: 20px; flex-shrink: 0; }

.login-right { flex: 1; display: flex; align-items: center; justify-content: center; padding: 48px; }
.login-card {
  width: 400px; max-width: 100%; background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius-m); box-shadow: 0 1px 3px rgba(0,0,0,0.06);
  padding: 32px; display: flex; flex-direction: column; align-items: center; gap: 24px;
}
.login-card .icon-circle {
  width: 56px; height: 56px; border-radius: 50%; background: var(--primary);
  display: flex; align-items: center; justify-content: center;
}
.login-card .icon-circle .lucide { width: 28px; height: 28px; color: var(--foreground); }
.login-card h2 { font-family: var(--font-primary); font-size: 24px; font-weight: 700; text-align: center; }
.login-card .subtitle { font-size: 14px; color: var(--muted-foreground); text-align: center; margin-top: -16px; }
.login-card .form-fields { width: 100%; display: flex; flex-direction: column; gap: 16px; }
.login-card .btn { width: 100%; height: 48px; }
.login-card .divider { width: 100%; height: 1px; background: var(--border); }
.info-note {
  width: 100%; background: var(--color-info); border-radius: 10px; padding: 12px 16px;
  display: flex; gap: 10px; align-items: flex-start;
}
.info-note .lucide { width: 18px; height: 18px; color: var(--color-info-foreground); flex-shrink: 0; margin-top: 1px; }
.info-note p { font-size: 13px; color: var(--foreground); line-height: 1.5; }
.error-message { color: var(--color-error-foreground); font-size: 13px; text-align: center; display: none; }

/* ── Dashboard Layout (Student Home / Teacher) ── */
.dashboard { display: flex; min-height: 100vh; }
.sidebar {
  width: 240px; min-width: 240px; background: var(--sidebar);
  display: flex; flex-direction: column; border-right: 1px solid var(--sidebar-border);
  position: sticky; top: 0; height: 100vh;
}
.sidebar-header { padding: 16px; display: flex; align-items: center; gap: 8px; }
.sidebar-logo {
  width: 32px; height: 32px; background: var(--primary); border-radius: 8px;
  display: flex; align-items: center; justify-content: center;
}
.sidebar-logo .lucide { width: 18px; height: 18px; color: var(--primary-foreground); }
.sidebar-brand { font-family: var(--font-primary); font-size: 14px; font-weight: 700; letter-spacing: 1px; }
.sidebar-content { flex: 1; padding: 8px 0; overflow-y: auto; }
.sidebar-section-title {
  padding: 8px 24px; font-size: 12px; font-weight: 500;
  color: var(--sidebar-foreground); text-transform: uppercase; letter-spacing: 0.5px;
}
.sidebar-item {
  display: flex; align-items: center; gap: 12px; padding: 10px 24px;
  cursor: pointer; color: var(--sidebar-foreground); font-size: 14px; transition: background 0.15s;
}
.sidebar-item:hover { background: var(--sidebar-accent); }
.sidebar-item.active {
  background: var(--sidebar-accent); color: var(--sidebar-accent-foreground);
  font-weight: 500; border-radius: 8px; margin: 0 8px; padding: 10px 16px;
}
.sidebar-item .lucide { width: 20px; height: 20px; }
.sidebar-footer {
  padding: 16px; border-top: 1px solid var(--sidebar-border);
  display: flex; align-items: center; gap: 12px; margin-top: auto;
}
.sidebar-avatar {
  width: 36px; height: 36px; border-radius: 50%; background: var(--secondary);
  display: flex; align-items: center; justify-content: center;
  font-size: 13px; font-weight: 600;
}
.sidebar-user-name { font-size: 13px; font-weight: 600; }
.sidebar-user-role { font-size: 11px; color: var(--muted-foreground); }

.main-content { flex: 1; padding: 32px 48px; display: flex; flex-direction: column; gap: 32px; }
.page-header { display: flex; align-items: flex-start; justify-content: space-between; }
.page-title { font-family: var(--font-primary); font-size: 28px; font-weight: 700; }
.page-subtitle { font-size: 14px; color: var(--muted-foreground); margin-top: 4px; }

/* ── Student Home Cards ── */
.mode-cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 20px; }
.mode-card {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius-m);
  padding: 32px; display: flex; flex-direction: column; gap: 16px;
  cursor: pointer; transition: all 0.2s ease;
  box-shadow: 0 1px 3px rgba(0,0,0,0.06);
}
.mode-card:hover { border-color: var(--primary); box-shadow: 0 4px 12px rgba(255,132,0,0.15); transform: translateY(-2px); }
.mode-card .icon-wrap {
  width: 48px; height: 48px; border-radius: 12px; background: var(--primary);
  display: flex; align-items: center; justify-content: center;
}
.mode-card .icon-wrap .lucide { width: 24px; height: 24px; color: var(--foreground); }
.mode-card h3 { font-family: var(--font-primary); font-size: 18px; font-weight: 700; }
.mode-card p { font-size: 14px; color: var(--muted-foreground); line-height: 1.5; }

/* ── Exam Selection ── */
.exam-list { display: flex; flex-direction: column; gap: 12px; }
.exam-item {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius-m);
  padding: 20px 24px; display: flex; align-items: center; justify-content: space-between;
  cursor: pointer; transition: all 0.15s; box-shadow: 0 1px 1.75px #0000000d;
}
.exam-item:hover { border-color: var(--primary); }
.exam-item-left { display: flex; flex-direction: column; gap: 4px; }
.exam-item-title { font-family: var(--font-primary); font-size: 16px; font-weight: 600; }
.exam-item-meta { font-size: 13px; color: var(--muted-foreground); }

/* ── Exam Page ── */
.exam-page { display: flex; flex-direction: column; min-height: 100vh; }
.exam-header {
  display: flex; align-items: center; padding: 16px 48px;
  border-bottom: 1px solid var(--border); background: var(--background);
}
.exam-header-inner { display: flex; align-items: center; justify-content: space-between; width: 100%; }
.exam-header-title { font-family: var(--font-primary); font-size: 16px; font-weight: 600; position: absolute; left: 50%; transform: translateX(-50%); }
.exam-header-back, .exam-header-close {
  display: flex; align-items: center; justify-content: center; width: 32px; height: 32px;
  cursor: pointer; background: none; border: none; color: var(--foreground); border-radius: 8px;
}
.exam-header-back:hover, .exam-header-close:hover { background: var(--secondary); }
.exam-body { display: flex; gap: 24px; padding: 32px 48px; flex: 1; align-items: flex-start; }

/* Question Panel */
.question-panel { flex: 1; display: flex; flex-direction: column; gap: 20px; }
.question-card {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius-m);
  box-shadow: 0 1px 3px rgba(0,0,0,0.06); padding: 32px; display: flex; flex-direction: column; gap: 24px;
}
.question-number { font-family: var(--font-primary); font-size: 14px; font-weight: 600; color: var(--muted-foreground); }
.question-text { font-size: 18px; font-weight: 500; line-height: 1.6; color: var(--foreground); }
.question-text p { margin-bottom: 8px; }

/* MCQ Options */
.options-list { display: flex; flex-direction: column; gap: 12px; }
.option {
  display: flex; align-items: center; gap: 14px; padding: 16px 20px;
  border-radius: 12px; cursor: pointer; transition: all 0.15s ease;
  background: var(--muted); border: 1px solid var(--border);
}
.option:hover { background: #ECEEED; }
.option.selected { background: #FFF7ED; border: 2px solid var(--primary); }
.option.correct { background: var(--color-success); border: 2px solid var(--color-success-foreground); }
.option.incorrect { background: var(--color-error); border: 2px solid var(--color-error-foreground); }
.radio-circle {
  width: 20px; height: 20px; min-width: 20px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center; flex-shrink: 0;
  background: var(--muted); border: 2px solid var(--foreground); transition: all 0.15s;
}
.option.selected .radio-circle { background: var(--foreground); border-color: var(--foreground); }
.option.selected .radio-circle::after { content: ''; width: 8px; height: 8px; border-radius: 50%; background: #fff; }
.option-label { font-size: 15px; font-weight: 500; }

/* Fill-in */
.fill-in-input {
  width: 100%; max-width: 300px; height: 48px; background: var(--muted);
  border: 2px solid var(--border); border-radius: 12px; padding: 0 16px;
  font-family: var(--font-primary); font-size: 18px; font-weight: 600; outline: none;
  transition: border-color 0.15s;
}
.fill-in-input:focus { border-color: var(--primary); }
.fill-in-input.correct { border-color: var(--color-success-foreground); background: var(--color-success); }
.fill-in-input.incorrect { border-color: var(--color-error-foreground); background: var(--color-error); }
.fill-in-row { display: flex; align-items: center; gap: 12px; }
.answer-unit { font-size: 16px; color: var(--muted-foreground); font-weight: 500; }

/* Essay */
.essay-actions { display: flex; gap: 12px; flex-wrap: wrap; }

/* Figure */
.figure-container { margin: 16px 0; padding: 16px; background: var(--muted); border-radius: 12px; text-align: center; }
.figure-container img { max-width: 100%; height: auto; border-radius: 8px; }
.figure-label { font-family: var(--font-primary); font-size: 11px; font-weight: 600; color: var(--primary); text-transform: uppercase; letter-spacing: 0.5px; margin-bottom: 6px; }
.figure-alt { font-size: 13px; color: var(--muted-foreground); font-style: italic; line-height: 1.5; }

/* Solution Panel */
.solution-panel {
  background: var(--color-success); border-radius: 12px; padding: 20px;
  display: flex; flex-direction: column; gap: 12px;
}
.solution-panel.incorrect-bg { background: var(--color-error); }
.solution-panel h4 { font-family: var(--font-primary); font-size: 14px; font-weight: 700; }
.solution-panel .steps { font-size: 14px; line-height: 1.8; }
.solution-panel .steps li { margin-left: 20px; margin-bottom: 4px; }

/* Hint Box */
.hint-box {
  background: #FFF8E1; border: 1px solid #FFE082; border-radius: 10px;
  padding: 14px 18px; font-size: 14px; line-height: 1.7; color: #5D4037;
}
.hint-box strong { color: #F57F17; }

/* Question Toolbar */
.question-toolbar .btn-sm {
  font-size: 12px; padding: 4px 10px; display: inline-flex; align-items: center; gap: 4px;
}

/* Action Bar */
.action-bar { display: flex; align-items: center; justify-content: space-between; }

/* Exam Sidebar */
.exam-sidebar {
  width: 320px; min-width: 320px; background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius-m); box-shadow: 0 1px 3px rgba(0,0,0,0.06); overflow: hidden;
  position: sticky; top: 32px;
}
.sidebar-section { padding: 20px; }
.sidebar-section + .sidebar-section { border-top: 1px solid var(--border); }
.sidebar-section-heading { font-family: var(--font-primary); font-size: 14px; font-weight: 700; margin-bottom: 16px; }

.question-grid { display: grid; grid-template-columns: repeat(5, 36px); gap: 8px; }
.question-square {
  width: 36px; height: 36px; border-radius: 8px; display: flex; align-items: center; justify-content: center;
  font-size: 13px; font-weight: 700; cursor: pointer; transition: all 0.15s; border: none;
}
.question-square.done { background: var(--color-success); color: var(--color-success-foreground); }
.question-square.current { background: var(--primary); color: var(--foreground); }
.question-square.not-done { background: var(--secondary); color: var(--muted-foreground); }
.question-square.flagged { background: var(--color-warning); color: var(--color-warning-foreground); }
.question-square.correct-review { background: #16a34a; color: #fff; }
.question-square.incorrect-review { background: var(--destructive); color: #fff; }

.timer-display { display: flex; align-items: center; gap: 10px; }
.timer-display .lucide { width: 20px; height: 20px; color: var(--muted-foreground); }
.timer-value { font-family: var(--font-primary); font-size: 32px; font-weight: 700; }
.timer-value.warning { color: var(--color-warning-foreground); }
.timer-value.danger { color: var(--destructive); }
.timer-note { font-size: 12px; color: var(--muted-foreground); margin-top: 4px; }

/* ── Exam Start Modal ── */
.modal-overlay {
  position: fixed; inset: 0; background: rgba(0,0,0,0.5); display: flex;
  align-items: center; justify-content: center; z-index: 100;
}
.modal-overlay.hidden { display: none; }
.modal {
  background: var(--card); border-radius: var(--radius-m); padding: 32px;
  width: 480px; max-width: 90vw; display: flex; flex-direction: column; gap: 24px;
  box-shadow: 0 20px 60px rgba(0,0,0,0.2);
}
.modal h2 { font-family: var(--font-primary); font-size: 20px; font-weight: 700; }
.modal p { font-size: 14px; color: var(--muted-foreground); line-height: 1.5; }
.modal-actions { display: flex; gap: 12px; justify-content: flex-end; }
.timer-mode-select { display: flex; gap: 12px; }
.timer-mode-option {
  flex: 1; padding: 16px; border: 2px solid var(--border); border-radius: 12px;
  cursor: pointer; text-align: center; transition: all 0.15s;
}
.timer-mode-option.selected { border-color: var(--primary); background: #FFF7ED; }
.timer-mode-option h4 { font-family: var(--font-primary); font-size: 14px; font-weight: 600; margin-bottom: 4px; }
.timer-mode-option p { font-size: 12px; color: var(--muted-foreground); }

/* ── Results ── */
.results-summary {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 16px; margin-bottom: 24px;
}

/* ── Progress Page ── */
.stats-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 16px; }
.chart-bar-container { display: flex; flex-direction: column; gap: 8px; }
.chart-bar-row { display: flex; align-items: center; gap: 12px; }
.chart-bar-label { font-size: 13px; width: 120px; text-align: right; color: var(--muted-foreground); }
.chart-bar-track { flex: 1; height: 24px; background: var(--secondary); border-radius: 4px; overflow: hidden; }
.chart-bar-fill { height: 100%; border-radius: 4px; background: var(--primary); transition: width 0.5s ease; display: flex; align-items: center; justify-content: flex-end; padding-right: 8px; }
.chart-bar-value { font-size: 11px; font-weight: 700; color: var(--foreground); min-width: 36px; text-align: right; }

/* ── Teacher Table ── */
.data-table { width: 100%; border-collapse: collapse; }
.data-table thead th {
  padding: 12px 16px; font-size: 13px; font-weight: 500; color: var(--muted-foreground);
  text-align: left; border-bottom: 1px solid var(--border);
}
.data-table tbody td {
  padding: 14px 16px; font-size: 14px; border-bottom: 1px solid var(--border); vertical-align: middle;
}
.data-table tbody tr:hover { background: var(--muted); }
.student-cell { display: flex; align-items: center; gap: 10px; }
.avatar-sm {
  width: 32px; height: 32px; border-radius: 50%; background: var(--secondary);
  display: flex; align-items: center; justify-content: center;
  font-size: 11px; font-weight: 600; flex-shrink: 0;
}
.progress-bar-sm { width: 80px; height: 8px; background: var(--secondary); border-radius: var(--radius-pill); overflow: hidden; }
.progress-bar-sm .fill { height: 100%; border-radius: var(--radius-pill); }

/* ── Section Divider ── */
.section-divider {
  background: var(--color-info); border-radius: 12px; padding: 16px 20px;
  margin: 8px 0; display: flex; align-items: center; gap: 12px;
}
.section-divider h3 { font-family: var(--font-primary); font-size: 16px; font-weight: 700; color: var(--color-info-foreground); }
.section-divider p { font-size: 13px; color: var(--color-info-foreground); }

/* ── Sub-parts ── */
.sub-parts { display: flex; flex-direction: column; gap: 16px; margin-top: 8px; }
.sub-part { padding: 12px 16px; background: var(--muted); border-radius: 8px; }
.sub-part-label { font-family: var(--font-primary); font-size: 13px; font-weight: 600; color: var(--primary); margin-bottom: 4px; }

/* ── Exam History List ── */
.history-list { display: flex; flex-direction: column; gap: 12px; }
.history-item {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius-m);
  padding: 16px 20px; display: flex; align-items: center; justify-content: space-between;
  box-shadow: 0 1px 1.75px #0000000d;
}
.history-item-left { display: flex; flex-direction: column; gap: 2px; }
.history-item-title { font-family: var(--font-primary); font-size: 14px; font-weight: 600; }
.history-item-meta { font-size: 12px; color: var(--muted-foreground); }
.history-score { font-family: var(--font-primary); font-size: 24px; font-weight: 700; }

/* ── Empty State ── */
.empty-state { text-align: center; padding: 48px; color: var(--muted-foreground); }
.empty-state .lucide { width: 48px; height: 48px; margin-bottom: 16px; opacity: 0.5; }
.empty-state h3 { font-family: var(--font-primary); font-size: 18px; color: var(--foreground); margin-bottom: 8px; }

/* ── Responsive ── */
@media (max-width: 1024px) {
  .sidebar { display: none; }
  .main-content { padding: 24px; }
  .exam-body { padding: 24px; }
}
@media (max-width: 900px) {
  .login-page { flex-direction: column; }
  .login-left { padding: 40px 24px; gap: 24px; }
  .login-right { padding: 40px 24px; }
  .exam-body { flex-direction: column; }
  .exam-sidebar { width: 100%; min-width: unset; position: static; }
  .exam-header { padding: 16px 20px; }
}
@media (max-width: 600px) {
  .login-left { padding: 32px 20px; }
  .login-left h1 { font-size: 20px; }
  .login-right { padding: 24px 16px; }
  .login-card { padding: 24px; }
  .question-text { font-size: 16px; }
  .mode-cards { grid-template-columns: 1fr; }
  .action-bar { flex-wrap: wrap; gap: 12px; justify-content: center; }
  .results-summary { grid-template-columns: 1fr 1fr; }
}

/* ── Utilities ── */
.hidden { display: none !important; }
.text-muted { color: var(--muted-foreground); }
.text-sm { font-size: 13px; }
.text-center { text-align: center; }
.flex-row { display: flex; align-items: center; gap: 8px; }
.gap-16 { gap: 16px; }
.gap-24 { gap: 24px; }
.mt-16 { margin-top: 16px; }
.mt-24 { margin-top: 24px; }
.mb-16 { margin-bottom: 16px; }