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

:root {
  --primary:        #6366f1;
  --primary-dark:   #4f46e5;
  --primary-light:  #a5b4fc;
  --success:        #10b981;
  --error:          #ef4444;
  --bg:             #f1f5f9;
  --card:           #ffffff;
  --text:           #0f172a;
  --text-muted:     #64748b;
  --border:         #e2e8f0;
  --radius:         0.75rem;
  --shadow:         0 1px 3px 0 rgb(0 0 0 / .1), 0 1px 2px -1px rgb(0 0 0 / .1);
  --shadow-lg:      0 10px 15px -3px rgb(0 0 0 / .1), 0 4px 6px -4px rgb(0 0 0 / .06);
  --shadow-xl:      0 20px 25px -5px rgb(0 0 0 / .1), 0 8px 10px -6px rgb(0 0 0 / .06);
  --transition:     all 0.2s ease;
}

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

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

/* ── Navbar ───────────────────────────────────────────────────────────────── */
.navbar {
  background: var(--card);
  border-bottom: 1px solid var(--border);
  padding: 0 2rem;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow);
}

.navbar-brand {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--primary);
  text-decoration: none;
}

.navbar-brand svg { flex-shrink: 0; }

.navbar-links {
  display: flex;
  gap: 1.5rem;
  list-style: none;
}

.navbar-links a {
  color: var(--text-muted);
  font-size: 0.95rem;
  font-weight: 500;
  transition: var(--transition);
}

.navbar-links a:hover { color: var(--primary); text-decoration: none; }

/* ── Hero ─────────────────────────────────────────────────────────────────── */
.hero {
  background: linear-gradient(135deg, #4f46e5 0%, #7c3aed 50%, #a855f7 100%);
  color: #fff;
  padding: 5rem 2rem 4rem;
  text-align: center;
}

.hero h1 {
  font-size: clamp(2rem, 5vw, 3.25rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 1rem;
  text-shadow: 0 2px 4px rgb(0 0 0 / .15);
}

.hero p {
  font-size: 1.15rem;
  opacity: 0.88;
  max-width: 540px;
  margin: 0 auto 2.5rem;
}

/* ── Shortener card ───────────────────────────────────────────────────────── */
.shortener-wrap {
  max-width: 700px;
  margin: 0 auto;
  width: 100%;
}

.shortener-card {
  background: var(--card);
  border-radius: var(--radius);
  padding: 2rem;
  box-shadow: var(--shadow-xl);
}

.input-row {
  display: flex;
  gap: 0.75rem;
}

.url-input {
  flex: 1;
  padding: 0.85rem 1.1rem;
  border: 2px solid var(--border);
  border-radius: 0.6rem;
  font-size: 1rem;
  color: var(--text);
  background: var(--bg);
  transition: var(--transition);
  outline: none;
}

.url-input::placeholder { color: var(--text-muted); }

.url-input:focus {
  border-color: var(--primary);
  background: #fff;
  box-shadow: 0 0 0 3px rgb(99 102 241 / .15);
}

/* ── Buttons ──────────────────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.85rem 1.5rem;
  border: none;
  border-radius: 0.6rem;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  white-space: nowrap;
}

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

.btn-primary:hover:not(:disabled) {
  background: var(--primary-dark);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgb(99 102 241 / .4);
}

.btn-primary:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.btn-ghost {
  background: transparent;
  color: var(--primary);
  border: 2px solid var(--border);
}

.btn-ghost:hover { border-color: var(--primary); background: rgb(99 102 241 / .05); }

.btn-sm { padding: 0.5rem 1rem; font-size: 0.85rem; }

.btn-success { background: var(--success); color: #fff; }
.btn-success:hover { background: #059669; }

/* ── Result box ───────────────────────────────────────────────────────────── */
.result-box {
  margin-top: 1.25rem;
  padding: 1.25rem 1.5rem;
  background: #f0fdf4;
  border: 1.5px solid #86efac;
  border-radius: 0.6rem;
  display: none;
}

.result-box.show { display: block; }

.result-label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--success);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.5rem;
}

.result-url-row {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.result-url {
  flex: 1;
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--primary-dark);
  word-break: break-all;
}

.result-actions { display: flex; gap: 0.5rem; flex-shrink: 0; }

/* ── Error box ────────────────────────────────────────────────────────────── */
.error-box {
  margin-top: 1rem;
  padding: 0.9rem 1.2rem;
  background: #fef2f2;
  border: 1.5px solid #fca5a5;
  border-radius: 0.6rem;
  color: var(--error);
  font-size: 0.9rem;
  display: none;
}

.error-box.show { display: block; }

/* ── Features strip ───────────────────────────────────────────────────────── */
.features {
  display: flex;
  justify-content: center;
  gap: 3rem;
  padding: 3rem 2rem;
  max-width: 900px;
  margin: 0 auto;
  flex-wrap: wrap;
}

.feature {
  text-align: center;
  max-width: 200px;
}

.feature-icon {
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background: rgb(99 102 241 / .1);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 0.85rem;
  color: var(--primary);
}

.feature h3 { font-size: 0.95rem; font-weight: 700; margin-bottom: 0.3rem; }
.feature p  { font-size: 0.85rem; color: var(--text-muted); }

/* ── Main content area ────────────────────────────────────────────────────── */
.content {
  max-width: 900px;
  margin: 0 auto;
  padding: 2.5rem 1.5rem;
  width: 100%;
  flex: 1;
}

/* ── Stats page ───────────────────────────────────────────────────────────── */
.page-header {
  margin-bottom: 2rem;
}

.page-header h2 {
  font-size: 1.6rem;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.page-header p { color: var(--text-muted); margin-top: 0.25rem; }

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 1rem;
  margin-bottom: 2rem;
}

.stat-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem 1.5rem;
  box-shadow: var(--shadow);
}

.stat-label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  margin-bottom: 0.4rem;
}

.stat-value {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--text);
}

.stat-value.accent { color: var(--primary); }

.url-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: var(--shadow);
  margin-bottom: 2rem;
}

.url-field { margin-bottom: 1rem; }
.url-field:last-child { margin-bottom: 0; }

.url-field-label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  margin-bottom: 0.3rem;
}

.url-field-value {
  font-size: 0.95rem;
  color: var(--text);
  word-break: break-all;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.url-field-value.primary { font-weight: 600; color: var(--primary-dark); }

/* ── Table ────────────────────────────────────────────────────────────────── */
.table-section { margin-top: 1.5rem; }

.table-title {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 1rem;
}

.table-wrap {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
}

thead { background: #f8fafc; }

th {
  padding: 0.85rem 1.25rem;
  text-align: left;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  border-bottom: 1px solid var(--border);
}

td {
  padding: 0.85rem 1.25rem;
  border-bottom: 1px solid var(--border);
  color: var(--text);
}

tr:last-child td { border-bottom: none; }
tr:hover td { background: #f8fafc; }

.badge {
  display: inline-block;
  padding: 0.2rem 0.6rem;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 600;
  background: rgb(99 102 241 / .1);
  color: var(--primary-dark);
}

.empty-state {
  text-align: center;
  padding: 3rem 1.5rem;
  color: var(--text-muted);
}

.empty-state svg { opacity: 0.4; margin-bottom: 0.75rem; }

/* ── Back link ────────────────────────────────────────────────────────────── */
.back-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-bottom: 1.5rem;
  transition: var(--transition);
}

.back-link:hover { color: var(--primary); text-decoration: none; }

/* ── Footer ───────────────────────────────────────────────────────────────── */
footer {
  text-align: center;
  padding: 1.5rem;
  font-size: 0.82rem;
  color: var(--text-muted);
  border-top: 1px solid var(--border);
  background: var(--card);
  margin-top: auto;
}

/* ── Spinner ──────────────────────────────────────────────────────────────── */
.spinner {
  width: 18px;
  height: 18px;
  border: 2px solid rgba(255,255,255,.4);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
  display: none;
}

.spinner.show { display: inline-block; }
@keyframes spin { to { transform: rotate(360deg); } }

/* ── Utility ──────────────────────────────────────────────────────────────── */
.hidden { display: none !important; }
.text-muted { color: var(--text-muted); }
.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }

/* ── Responsive ───────────────────────────────────────────────────────────── */
@media (max-width: 600px) {
  .navbar { padding: 0 1rem; }
  .hero { padding: 3rem 1rem 2.5rem; }
  .shortener-card { padding: 1.25rem; }
  .input-row { flex-direction: column; }
  .result-url-row { flex-direction: column; align-items: flex-start; }
  .result-actions { width: 100%; }
  .features { gap: 1.5rem; }
  th, td { padding: 0.7rem 0.9rem; }
  .stats-grid { grid-template-columns: 1fr 1fr; }
}