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

:root {
  --bg-primary: #0a0e1a;
  --bg-secondary: #111827;
  --glass-bg: rgba(255, 255, 255, 0.04);
  --glass-border: rgba(255, 255, 255, 0.08);
  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --accent-blue: #3b82f6;
  --accent-purple: #8b5cf6;
  --accent-cyan: #06b6d4;
  --cope-red: #ef4444;
  --cope-orange: #f97316;
  --hope-green: #10b981;
  --hope-teal: #14b8a6;
  --radius: 16px;
  --radius-sm: 10px;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  overflow-x: hidden;
  line-height: 1.6;
}

/* ===== Background Glow ===== */
.bg-glow {
  position: fixed;
  top: -200px;
  left: 50%;
  transform: translateX(-50%);
  width: 800px;
  height: 800px;
  background: radial-gradient(circle, rgba(59, 130, 246, 0.12) 0%, rgba(139, 92, 246, 0.06) 40%, transparent 70%);
  pointer-events: none;
  z-index: 0;
}

/* ===== Layout ===== */
.container {
  position: relative;
  z-index: 1;
  max-width: 720px;
  margin: 0 auto;
  padding: 60px 24px 80px;
}

/* ===== Hero ===== */
.hero {
  text-align: center;
  margin-bottom: 48px;
}

.hero h1 {
  font-size: 3.2rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple), var(--accent-cyan));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 12px;
}

.hero .amp {
  font-weight: 300;
  opacity: 0.7;
}

.subtitle {
  font-size: 1.1rem;
  color: var(--text-secondary);
  font-weight: 300;
}

/* ===== Glass Card ===== */
.glass {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
}

/* ===== Search Card ===== */
.search-card {
  padding: 32px;
  margin-bottom: 32px;
}

.input-row {
  display: flex;
  gap: 20px;
  margin-bottom: 24px;
}

.input-group {
  flex: 1;
}

.input-group label,
.mode-toggle label:first-child {
  display: block;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 8px;
}

.input-group input {
  width: 100%;
  padding: 14px 18px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 1rem;
  font-family: inherit;
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.input-group input:focus {
  border-color: var(--accent-blue);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15);
}

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

/* ===== Toggle Buttons ===== */
.toggle-group {
  display: flex;
  gap: 0;
  background: rgba(255, 255, 255, 0.04);
  border-radius: var(--radius-sm);
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.toggle-group input[type="radio"] {
  display: none;
}

.toggle-btn {
  padding: 14px 24px;
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  color: var(--text-muted);
  transition: all 0.25s ease;
  text-align: center;
  flex: 1;
  user-select: none;
}

.toggle-group input:checked + .toggle-btn {
  background: rgba(59, 130, 246, 0.15);
  color: var(--accent-blue);
}

/* ===== Submit Button ===== */
button[type="submit"] {
  width: 100%;
  padding: 16px;
  background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
  border: none;
  border-radius: var(--radius-sm);
  color: white;
  font-size: 1rem;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  transition: transform 0.15s, box-shadow 0.25s;
  position: relative;
}

button[type="submit"]:hover:not(:disabled) {
  transform: translateY(-1px);
  box-shadow: 0 8px 30px rgba(59, 130, 246, 0.3);
}

button[type="submit"]:active:not(:disabled) {
  transform: translateY(0);
}

button[type="submit"]:disabled {
  opacity: 0.7;
  cursor: wait;
}

.btn-loader {
  display: inline-block;
  width: 18px;
  height: 18px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-top-color: white;
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
  vertical-align: middle;
  margin-left: 8px;
}

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

/* ===== Results ===== */
.results {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.result-card {
  padding: 28px 32px;
  position: relative;
  overflow: hidden;
}

.card-label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.result-card h2 {
  font-size: 1.6rem;
  font-weight: 600;
  margin-bottom: 4px;
}

.temp-display {
  margin: 12px 0;
}

.temp {
  font-size: 3rem;
  font-weight: 700;
  letter-spacing: -0.03em;
}

.unit {
  font-size: 1.4rem;
  font-weight: 300;
  color: var(--text-secondary);
  vertical-align: super;
}

.description {
  font-size: 1rem;
  color: var(--text-secondary);
  text-transform: capitalize;
}

.humidity {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 4px;
}

/* ===== Cope/Hope Card Highlights ===== */
.cope-highlight {
  border-color: rgba(239, 68, 68, 0.2);
  background: linear-gradient(135deg, rgba(239, 68, 68, 0.06), rgba(249, 115, 22, 0.04));
}

.cope-highlight .temp {
  color: var(--cope-orange);
}

.hope-highlight {
  border-color: rgba(16, 185, 129, 0.2);
  background: linear-gradient(135deg, rgba(16, 185, 129, 0.06), rgba(20, 184, 166, 0.04));
}

.hope-highlight .temp {
  color: var(--hope-green);
}

/* ===== Arrow Divider ===== */
.arrow-divider {
  text-align: center;
  font-size: 2rem;
  padding: 4px 0;
}

/* ===== Message Card ===== */
.message-card {
  padding: 24px 32px;
  text-align: center;
}

.message-card p {
  font-size: 1.05rem;
  font-style: italic;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ===== Error Card ===== */
.error-card {
  padding: 20px 28px;
  border-color: rgba(239, 68, 68, 0.2);
  background: rgba(239, 68, 68, 0.06);
  text-align: center;
}

.error-card p {
  color: var(--cope-red);
  font-weight: 500;
}

/* ===== Animations ===== */
.fade-in {
  animation: fadeIn 0.4s ease-out;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ===== Responsive ===== */
@media (max-width: 600px) {
  .hero h1 {
    font-size: 2.2rem;
  }

  .input-row {
    flex-direction: column;
    gap: 16px;
  }

  .container {
    padding: 40px 16px 60px;
  }

  .result-card {
    padding: 24px 20px;
  }

  .temp {
    font-size: 2.4rem;
  }
}