/* ============================
   CSS Custom Properties
   ============================ */
:root {
  --primary: #4F46E5;
  --primary-dark: #3730A3;
  --primary-light: #EEF2FF;
  --success: #10B981;
  --success-light: #ECFDF5;
  --warning: #F59E0B;
  --warning-light: #FFFBEB;
  --danger: #EF4444;
  --danger-light: #FEF2F2;
  --info: #3B82F6;
  --info-light: #EFF6FF;

  /* Error type colors */
  --grammar-color: #3B82F6;
  --grammar-bg: #DBEAFE;
  --spelling-color: #EF4444;
  --spelling-bg: #FEE2E2;
  --punctuation-color: #F59E0B;
  --punctuation-bg: #FEF3C7;
  --syntax-color: #8B5CF6;
  --syntax-bg: #EDE9FE;

  --gray-50: #F9FAFB;
  --gray-100: #F3F4F6;
  --gray-200: #E5E7EB;
  --gray-300: #D1D5DB;
  --gray-500: #6B7280;
  --gray-600: #4B5563;
  --gray-700: #374151;
  --gray-800: #1F2937;
  --gray-900: #111827;

  --radius: 10px;
  --radius-sm: 6px;
  --radius-lg: 16px;
  --shadow: 0 1px 3px rgba(0,0,0,0.1), 0 1px 2px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -2px rgba(0,0,0,0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -4px rgba(0,0,0,0.1);

  --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
  --font-serif: 'Merriweather', Georgia, serif;
}

/* ============================
   Reset & Base
   ============================ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { font-size: 16px; scroll-behavior: smooth; }

body {
  font-family: var(--font-sans);
  background: var(--gray-50);
  color: var(--gray-800);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  line-height: 1.6;
}

a { color: var(--primary); text-decoration: none; }
a:hover { color: var(--primary-dark); }

/* ============================
   Navbar
   ============================ */
.navbar {
  background: #fff;
  border-bottom: 1px solid var(--gray-200);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow);
}

.nav-container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 1.5rem;
  height: 64px;
  display: flex;
  align-items: center;
  gap: 2rem;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 700;
  font-size: 1.2rem;
  color: var(--gray-900);
  text-decoration: none;
}

.brand-icon { font-size: 1.4rem; }
.brand-text { color: var(--primary); }

.nav-links {
  list-style: none;
  display: flex;
  gap: 0.25rem;
  margin-left: auto;
}

.nav-link {
  padding: 0.4rem 0.9rem;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--gray-600);
  transition: all 0.15s;
  text-decoration: none;
}

.nav-link:hover { background: var(--gray-100); color: var(--gray-900); }
.nav-link.active { background: var(--primary-light); color: var(--primary); font-weight: 600; }

.nav-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.4rem;
  cursor: pointer;
  color: var(--gray-600);
  margin-left: auto;
}

/* ============================
   Main Content
   ============================ */
.main-content { flex: 1; padding-bottom: 3rem; }

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* ============================
   Hero
   ============================ */
.hero {
  background: linear-gradient(135deg, var(--primary) 0%, #7C3AED 100%);
  color: #fff;
  padding: 3.5rem 1.5rem 3rem;
  text-align: center;
  margin-bottom: 2rem;
}

.hero-content { max-width: 640px; margin: 0 auto; }

.hero-title {
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 700;
  margin-bottom: 0.75rem;
  letter-spacing: -0.02em;
}

.hero-subtitle {
  font-size: 1.05rem;
  opacity: 0.9;
  max-width: 520px;
  margin: 0 auto;
}

/* ============================
   Cards
   ============================ */
.card {
  background: #fff;
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  box-shadow: var(--shadow);
  border: 1px solid var(--gray-200);
  margin-bottom: 1.25rem;
}

.card-header { margin-bottom: 1.5rem; }
.card-header-sm { margin-bottom: 1rem; }
.card-title { font-size: 1.2rem; font-weight: 600; display: flex; align-items: center; gap: 0.5rem; margin-bottom: 0.4rem; }
.card-title-sm { font-size: 1rem; font-weight: 600; margin-bottom: 1rem; color: var(--gray-700); }
.card-icon { font-size: 1.3rem; }
.card-desc { color: var(--gray-500); font-size: 0.9rem; }

/* ============================
   Forms
   ============================ */
.form-group { margin-bottom: 1.25rem; }

.form-label {
  display: block;
  font-weight: 500;
  font-size: 0.9rem;
  color: var(--gray-700);
  margin-bottom: 0.4rem;
}

.form-input, .form-textarea, .form-select {
  width: 100%;
  padding: 0.65rem 0.9rem;
  border: 1.5px solid var(--gray-300);
  border-radius: var(--radius-sm);
  font-family: var(--font-sans);
  font-size: 0.95rem;
  color: var(--gray-800);
  background: #fff;
  transition: border-color 0.15s, box-shadow 0.15s;
  outline: none;
}

.form-input:focus, .form-textarea:focus, .form-select:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.form-textarea {
  resize: vertical;
  font-family: var(--font-sans);
  line-height: 1.7;
}

.char-counter {
  text-align: right;
  font-size: 0.8rem;
  color: var(--gray-500);
  margin-top: 0.3rem;
}

/* ============================
   Buttons
   ============================ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.5rem 1.1rem;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  border: 1.5px solid transparent;
  transition: all 0.15s;
  text-decoration: none;
  white-space: nowrap;
}

.btn-primary {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}
.btn-primary:hover { background: var(--primary-dark); border-color: var(--primary-dark); color: #fff; }

.btn-outline {
  background: transparent;
  color: var(--primary);
  border-color: var(--primary);
}
.btn-outline:hover { background: var(--primary-light); }

.btn-ghost {
  background: transparent;
  color: var(--gray-600);
  border-color: var(--gray-200);
}
.btn-ghost:hover { background: var(--gray-100); color: var(--gray-800); }

.btn-lg { padding: 0.75rem 1.75rem; font-size: 1rem; }
.btn-sm { padding: 0.35rem 0.75rem; font-size: 0.8rem; }
.btn-full { width: 100%; justify-content: center; margin-bottom: 0.5rem; }
.btn-row { display: flex; gap: 0.5rem; margin-top: 0.75rem; }

/* ============================
   Alerts / Flash
   ============================ */
.flash-container { max-width: 1100px; margin: 1rem auto; padding: 0 1.5rem; }

.alert {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 1rem;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  margin-bottom: 0.5rem;
  border: 1px solid transparent;
}

.alert-success { background: var(--success-light); color: #065F46; border-color: #A7F3D0; }
.alert-danger { background: var(--danger-light); color: #991B1B; border-color: #FECACA; }
.alert-warning { background: var(--warning-light); color: #92400E; border-color: #FDE68A; }

.alert-close {
  background: none;
  border: none;
  font-size: 1.2rem;
  cursor: pointer;
  opacity: 0.6;
  line-height: 1;
  padding: 0 0.2rem;
}
.alert-close:hover { opacity: 1; }

/* ============================
   Features grid (home page)
   ============================ */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
  margin-top: 1.5rem;
}

.feature-card {
  background: #fff;
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  padding: 1.25rem;
  text-align: center;
  box-shadow: var(--shadow);
}

.feature-icon { font-size: 2rem; margin-bottom: 0.6rem; }
.feature-card h3 { font-size: 0.95rem; font-weight: 600; margin-bottom: 0.4rem; }
.feature-card p { font-size: 0.85rem; color: var(--gray-500); line-height: 1.5; }

/* ============================
   Loading Overlay
   ============================ */
.loading-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: 999;
  display: flex;
  align-items: center;
  justify-content: center;
}

.loading-card {
  background: #fff;
  border-radius: var(--radius-lg);
  padding: 2.5rem 3rem;
  text-align: center;
  box-shadow: var(--shadow-lg);
}

.spinner {
  width: 48px;
  height: 48px;
  border: 4px solid var(--gray-200);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.9s linear infinite;
  margin: 0 auto 1rem;
}

@keyframes spin { to { transform: rotate(360deg); } }

.loading-text { font-size: 1.1rem; font-weight: 600; margin-bottom: 0.25rem; }
.loading-sub { font-size: 0.85rem; color: var(--gray-500); }

/* ============================
   Feedback page
   ============================ */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  color: var(--gray-500);
  padding: 1.25rem 0 0;
  margin-bottom: 1.25rem;
}
.breadcrumb a { color: var(--primary); }

.feedback-header {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.25rem;
}

.page-title { font-size: 1.6rem; font-weight: 700; margin-bottom: 0.4rem; }
.page-desc { color: var(--gray-500); font-size: 0.95rem; }
.page-header { padding: 1.5rem 0 1.25rem; }

.meta-row { display: flex; flex-wrap: wrap; gap: 1rem; font-size: 0.85rem; color: var(--gray-600); }
.meta-item { white-space: nowrap; }

.error-type-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  align-items: center;
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 0.3rem;
  font-size: 0.8rem;
  color: var(--gray-600);
  font-weight: 500;
}

.legend-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  flex-shrink: 0;
}
.dot-grammar { background: var(--grammar-color); }
.dot-spelling { background: var(--spelling-color); }
.dot-punctuation { background: var(--punctuation-color); }
.dot-syntax { background: var(--syntax-color); }

/* Summary card */
.summary-card {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
  background: var(--primary-light);
  border-color: #C7D2FE;
}
.summary-icon { font-size: 1.6rem; flex-shrink: 0; margin-top: 0.1rem; }
.summary-content h3 { font-size: 0.9rem; font-weight: 600; color: var(--primary); margin-bottom: 0.3rem; }
.summary-content p { font-size: 0.9rem; color: var(--gray-700); line-height: 1.6; }

/* Perfect card */
.perfect-card {
  text-align: center;
  background: var(--success-light);
  border-color: #A7F3D0;
  padding: 2rem;
}
.perfect-icon { font-size: 2.5rem; margin-bottom: 0.75rem; }
.perfect-card h2 { color: #065F46; font-size: 1.3rem; margin-bottom: 0.4rem; }
.perfect-card p { color: #047857; font-size: 0.9rem; }

/* Two column layout */
.two-col { display: grid; grid-template-columns: 1fr 320px; gap: 1.25rem; align-items: start; }
.col-main {}
.col-side {}

/* Writing display */
.writing-display {
  font-family: var(--font-serif);
  font-size: 1rem;
  line-height: 1.9;
  color: var(--gray-800);
  padding: 0.5rem 0;
}

.writing-display p { margin: 0; }

/* Highlights */
.highlight {
  border-radius: 3px;
  padding: 1px 2px;
  cursor: pointer;
  border-bottom: 2.5px solid;
  position: relative;
  transition: opacity 0.15s;
}
.highlight:hover { opacity: 0.8; }

.highlight-grammar { background: var(--grammar-bg); border-bottom-color: var(--grammar-color); }
.highlight-spelling { background: var(--spelling-bg); border-bottom-color: var(--spelling-color); }
.highlight-punctuation { background: var(--punctuation-bg); border-bottom-color: var(--punctuation-color); }
.highlight-syntax { background: var(--syntax-bg); border-bottom-color: var(--syntax-color); }

.hint { font-size: 0.82rem; color: var(--gray-500); margin-top: 0.25rem; }
.tag {
  display: inline-block;
  background: var(--gray-100);
  color: var(--gray-500);
  font-size: 0.72rem;
  font-weight: 500;
  padding: 1px 7px;
  border-radius: 99px;
  margin-left: 0.4rem;
  vertical-align: middle;
}

/* Issues list */
.issues-list { display: flex; flex-direction: column; gap: 0.75rem; }

.issue-item {
  border-radius: var(--radius-sm);
  padding: 0.75rem 1rem;
  border-left: 4px solid;
}
.issue-grammar { background: #F0F7FF; border-left-color: var(--grammar-color); }
.issue-spelling { background: #FFF5F5; border-left-color: var(--spelling-color); }
.issue-punctuation { background: #FFFBF0; border-left-color: var(--punctuation-color); }
.issue-syntax { background: #F5F3FF; border-left-color: var(--syntax-color); }

.issue-header { display: flex; align-items: center; gap: 0.75rem; margin-bottom: 0.5rem; }

.issue-badge, .mini-badge {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 99px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.badge-grammar { background: var(--grammar-bg); color: #1E3A8A; }
.badge-spelling { background: var(--spelling-bg); color: #7F1D1D; }
.badge-punctuation { background: var(--punctuation-bg); color: #78350F; }
.badge-syntax { background: var(--syntax-bg); color: #4C1D95; }

.issue-original {
  font-family: monospace;
  font-size: 0.85rem;
  background: rgba(0,0,0,0.05);
  padding: 1px 6px;
  border-radius: 3px;
}

.issue-suggestion { font-size: 0.85rem; margin-bottom: 0.25rem; color: var(--gray-700); }
.issue-explanation { font-size: 0.85rem; color: var(--gray-600); }

/* Breakdown */
.breakdown-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.3rem 0;
  border-bottom: 1px solid var(--gray-100);
  font-size: 0.88rem;
}
.breakdown-label { display: flex; align-items: center; gap: 0.4rem; }
.breakdown-count { font-weight: 600; color: var(--gray-700); }

/* Rewrite */
.rewrite-saved-badge {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--success);
  margin-bottom: 0.75rem;
}
.rewrite-display { font-size: 0.9rem; line-height: 1.7; color: var(--gray-700); padding: 0; margin-bottom: 0.75rem; }

/* Nav card */
.nav-card { display: flex; flex-direction: column; gap: 0.1rem; }

/* Badges */
.badge {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 99px;
  font-size: 0.75rem;
  font-weight: 600;
}
.badge-success { background: var(--success-light); color: #065F46; }
.badge-warning { background: var(--warning-light); color: #78350F; }
.badge-info { background: var(--info-light); color: #1E40AF; }

/* Tooltip */
.tooltip-popup {
  position: fixed;
  z-index: 500;
  width: 300px;
  background: #fff;
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--gray-200);
  font-size: 0.88rem;
  pointer-events: auto;
  animation: fadeIn 0.15s ease;
}

@keyframes fadeIn { from { opacity: 0; transform: translateY(-4px); } to { opacity: 1; transform: none; } }

.tooltip-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.6rem 0.9rem;
  border-bottom: 1px solid var(--gray-100);
}

.tooltip-type {
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 2px 8px;
  border-radius: 99px;
}
.tooltip-type.type-grammar { background: var(--grammar-bg); color: #1E3A8A; }
.tooltip-type.type-spelling { background: var(--spelling-bg); color: #7F1D1D; }
.tooltip-type.type-punctuation { background: var(--punctuation-bg); color: #78350F; }
.tooltip-type.type-syntax { background: var(--syntax-bg); color: #4C1D95; }

.tooltip-close {
  background: none;
  border: none;
  font-size: 1.1rem;
  cursor: pointer;
  color: var(--gray-400);
  line-height: 1;
  padding: 0 0.2rem;
}
.tooltip-close:hover { color: var(--gray-700); }

.tooltip-body { padding: 0.75rem 0.9rem; }
.tooltip-section { margin-bottom: 0.6rem; }
.tooltip-section:last-child { margin-bottom: 0; }
.tooltip-label { font-size: 0.7rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.06em; color: var(--gray-400); display: block; margin-bottom: 0.2rem; }
.tooltip-suggestion { font-weight: 600; color: var(--gray-800); margin: 0; }
.tooltip-explanation { color: var(--gray-600); margin: 0; line-height: 1.5; }

/* ============================
   History page
   ============================ */
.filter-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  background: #fff;
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  padding: 0.75rem 1rem;
  margin-bottom: 1.25rem;
  box-shadow: var(--shadow);
}

.filter-form { display: flex; align-items: center; gap: 0.75rem; flex-wrap: wrap; }
.filter-label { font-size: 0.85rem; font-weight: 500; color: var(--gray-600); white-space: nowrap; }
.form-select { width: auto; min-width: 160px; }
.filter-count { font-size: 0.82rem; color: var(--gray-500); white-space: nowrap; }

.submissions-list { display: flex; flex-direction: column; gap: 1rem; }

.submission-card { padding: 1.25rem; }

.submission-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 0.6rem;
  gap: 1rem;
}

.submission-student { font-weight: 600; font-size: 1rem; margin-bottom: 0.15rem; }
.submission-date { font-size: 0.8rem; color: var(--gray-500); }

.submission-stats { display: flex; gap: 0.4rem; flex-wrap: wrap; }
.stat-pill {
  font-size: 0.75rem;
  font-weight: 600;
  padding: 2px 9px;
  border-radius: 99px;
  white-space: nowrap;
}
.stat-success { background: var(--success-light); color: #065F46; }
.stat-warning { background: var(--warning-light); color: #78350F; }
.stat-info { background: var(--info-light); color: #1E40AF; }

.submission-preview {
  font-size: 0.88rem;
  color: var(--gray-600);
  line-height: 1.5;
  margin-bottom: 0.6rem;
}

.submission-types { display: flex; gap: 0.35rem; flex-wrap: wrap; margin-bottom: 0.75rem; }
.mini-grammar { background: var(--grammar-bg); color: #1E3A8A; }
.mini-spelling { background: var(--spelling-bg); color: #7F1D1D; }
.mini-punctuation { background: var(--punctuation-bg); color: #78350F; }
.mini-syntax { background: var(--syntax-bg); color: #4C1D95; }

.submission-footer { display: flex; gap: 0.5rem; }

/* ============================
   Progress page
   ============================ */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 1rem;
  margin-bottom: 1.25rem;
}

.stat-card {
  background: #fff;
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  padding: 1.25rem;
  text-align: center;
  box-shadow: var(--shadow);
}

.stat-value { font-size: 2rem; font-weight: 700; color: var(--primary); line-height: 1; margin-bottom: 0.3rem; }
.stat-label { font-size: 0.8rem; color: var(--gray-500); font-weight: 500; }

.chart-container { position: relative; height: 220px; }
.chart-note { font-size: 0.9rem; color: var(--gray-500); text-align: center; padding: 1.5rem; }

.progress-svg {
  width: 100%;
  height: auto;
  display: block;
  overflow: visible;
}

/* Type bars */
.type-bars { display: flex; flex-direction: column; gap: 0.75rem; }
.type-bar-row { display: grid; grid-template-columns: 120px 1fr 70px; align-items: center; gap: 0.75rem; }
.type-bar-label { display: flex; align-items: center; gap: 0.4rem; font-size: 0.85rem; font-weight: 500; }
.type-bar-track { background: var(--gray-100); border-radius: 99px; height: 10px; overflow: hidden; }
.type-bar-fill { height: 100%; border-radius: 99px; min-width: 8px; }
.fill-grammar { background: var(--grammar-color); }
.fill-spelling { background: var(--spelling-color); }
.fill-punctuation { background: var(--punctuation-color); }
.fill-syntax { background: var(--syntax-color); }
.type-bar-count { font-size: 0.8rem; color: var(--gray-500); text-align: right; }

/* Common mistakes */
.common-mistakes-list { list-style: none; counter-reset: item; display: flex; flex-direction: column; gap: 0.5rem; }
.common-mistake-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.75rem;
  padding: 0.5rem 0.75rem;
  background: var(--gray-50);
  border-radius: var(--radius-sm);
  border: 1px solid var(--gray-200);
  font-size: 0.85rem;
}
.mistake-text { font-family: monospace; color: var(--gray-700); flex: 1; word-break: break-word; }
.mistake-count { font-weight: 700; color: var(--primary); white-space: nowrap; }

/* Tip card */
.tip-card {
  background: var(--warning-light);
  border-color: #FDE68A;
  text-align: center;
  padding: 1.5rem;
}
.tip-icon { font-size: 1.8rem; margin-bottom: 0.6rem; }
.tip-card h3 { font-size: 0.95rem; font-weight: 700; color: #78350F; margin-bottom: 0.4rem; }
.tip-card p { font-size: 0.85rem; color: #92400E; line-height: 1.6; }

/* ============================
   Empty state
   ============================ */
.empty-state {
  text-align: center;
  padding: 4rem 1.5rem;
}
.empty-icon { font-size: 3rem; margin-bottom: 1rem; }
.empty-state h2 { font-size: 1.3rem; margin-bottom: 0.5rem; color: var(--gray-700); }
.empty-state p { color: var(--gray-500); margin-bottom: 1.5rem; font-size: 0.95rem; }

/* ============================
   Footer
   ============================ */
.footer {
  background: #fff;
  border-top: 1px solid var(--gray-200);
  padding: 1.25rem 1.5rem;
  margin-top: auto;
}

.footer-inner {
  max-width: 1100px;
  margin: 0 auto;
  text-align: center;
  font-size: 0.82rem;
  color: var(--gray-500);
}

/* ============================
   Utilities
   ============================ */
.hidden { display: none !important; }

/* ============================
   Responsive
   ============================ */
@media (max-width: 768px) {
  .nav-links { display: none; flex-direction: column; position: absolute; top: 64px; left: 0; right: 0; background: #fff; border-bottom: 1px solid var(--gray-200); padding: 0.75rem; box-shadow: var(--shadow-md); }
  .nav-links.open { display: flex; }
  .nav-toggle { display: block; }
  .nav-container { flex-wrap: wrap; }

  .two-col { grid-template-columns: 1fr; }
  .hero { padding: 2rem 1.25rem; }
  .features-grid { grid-template-columns: 1fr 1fr; }
  .stats-grid { grid-template-columns: 1fr 1fr; }
  .type-bar-row { grid-template-columns: 90px 1fr 55px; }
  .submission-top { flex-direction: column; }

  .container { padding: 0 1rem; }
}

@media (max-width: 480px) {
  .features-grid { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: 1fr 1fr; }
  .filter-form { flex-direction: column; align-items: flex-start; }
}