/* ===== CSS Variables / Theming ===== */
:root {
  --bg: #ffffff;
  --bg-card: #f8f9fa;
  --bg-header: #1a1a2e;
  --text: #1a1a2e;
  --text-muted: #6c757d;
  --text-header: #ffffff;
  --border: #dee2e6;
  --accent: #6c5ce7;
  --accent-hover: #5a4bd1;
  --tag-bg: #e9ecef;
  --tag-text: #495057;
  --badge-free: #28a745;
  --badge-freemium: #007bff;
  --badge-paid: #fd7e14;
  --shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
  --radius: 10px;
}

[data-theme="dark"] {
  --bg: #0f0f1a;
  --bg-card: #1a1a2e;
  --bg-header: #16213e;
  --text: #e4e4e4;
  --text-muted: #a0a0b0;
  --border: #2a2a3e;
  --tag-bg: #2a2a3e;
  --tag-text: #c0c0d0;
  --shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  transition: background 0.3s, color 0.3s;
}

a {
  color: var(--accent);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

/* ===== Header ===== */
header {
  background: var(--bg-header);
  color: var(--text-header);
  padding: 2.5rem 1.5rem 2rem;
  text-align: center;
}

.header-content {
  max-width: 900px;
  margin: 0 auto;
}

header h1 {
  font-size: 2.2rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.tagline {
  font-size: 1.1rem;
  opacity: 0.85;
  margin-bottom: 1.2rem;
}

.header-actions {
  display: flex;
  justify-content: center;
  gap: 0.75rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.5rem 1.2rem;
  border-radius: 6px;
  font-size: 0.9rem;
  font-weight: 500;
  border: none;
  cursor: pointer;
  transition: background 0.2s;
}

.btn-github {
  background: rgba(255, 255, 255, 0.15);
  color: #fff;
}

.btn-github:hover {
  background: rgba(255, 255, 255, 0.25);
  text-decoration: none;
}

.btn-theme {
  background: rgba(255, 255, 255, 0.15);
  color: #fff;
  font-size: 1.1rem;
}

.btn-theme:hover {
  background: rgba(255, 255, 255, 0.25);
}

/* ===== Main ===== */
main {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem 1.5rem;
}

/* ===== Controls ===== */
.controls {
  margin-bottom: 2rem;
}

#search-input {
  width: 100%;
  padding: 0.75rem 1rem;
  font-size: 1rem;
  border: 2px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg);
  color: var(--text);
  margin-bottom: 1rem;
  transition: border-color 0.2s;
}

#search-input:focus {
  outline: none;
  border-color: var(--accent);
}

.filters {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  align-items: center;
}

.filter-group {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.filter-group label {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-muted);
}

.filter-group select {
  padding: 0.4rem 0.8rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg);
  color: var(--text);
  font-size: 0.9rem;
}

.checkbox-label {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  cursor: pointer;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.results-count {
  margin-top: 0.75rem;
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* ===== Category Section ===== */
.category-section {
  margin-bottom: 2.5rem;
}

.category-header {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.4rem;
}

.category-header h2 {
  font-size: 1.5rem;
  font-weight: 600;
}

.category-description {
  color: var(--text-muted);
  margin-bottom: 1rem;
  font-size: 0.95rem;
}

/* ===== Tool Cards Grid ===== */
.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1rem;
}

.tool-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.2rem;
  box-shadow: var(--shadow);
  transition: transform 0.15s, box-shadow 0.15s;
  display: flex;
  flex-direction: column;
}

.tool-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.12);
}

.tool-card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 0.5rem;
}

.tool-name {
  font-size: 1.1rem;
  font-weight: 600;
}

.tool-name a {
  color: var(--text);
}

.tool-name a:hover {
  color: var(--accent);
}

.tool-badges {
  display: flex;
  gap: 0.4rem;
  flex-shrink: 0;
}

.badge {
  font-size: 0.7rem;
  font-weight: 600;
  padding: 0.15rem 0.5rem;
  border-radius: 20px;
  color: #fff;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.badge-free { background: var(--badge-free); }
.badge-freemium { background: var(--badge-freemium); }
.badge-paid { background: var(--badge-paid); }
.badge-oss {
  background: transparent;
  border: 1px solid var(--badge-free);
  color: var(--badge-free);
}

.tool-details {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.5;
}

.tool-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.tag {
  font-size: 0.75rem;
  padding: 0.15rem 0.6rem;
  border-radius: 20px;
  background: var(--tag-bg);
  color: var(--tag-text);
}

/* ===== Empty State ===== */
.empty-state {
  text-align: center;
  padding: 3rem 1rem;
  color: var(--text-muted);
}

.empty-state p {
  font-size: 1.1rem;
}

/* ===== Footer ===== */
footer {
  text-align: center;
  padding: 2rem 1.5rem;
  border-top: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 0.9rem;
}

/* ===== Responsive ===== */
@media (max-width: 600px) {
  header h1 {
    font-size: 1.6rem;
  }

  .tools-grid {
    grid-template-columns: 1fr;
  }

  .filters {
    flex-direction: column;
    align-items: flex-start;
  }
}