/* 
 * Korea ZipCode Hub - Premium Claymorphism Design System 
 * Based on AI Word Studio Design System
 */

:root {
  /* Light Theme */
  --clay-bg: #f0f4f8;
  --clay-card-bg: rgba(255, 255, 255, 0.85);
  --text-main: #1e293b;
  --text-muted: #64748b;
  --accent-color: #3b82f6;
  --shadow-outer: 12px 12px 24px rgba(163, 177, 198, 0.5), -12px -12px 24px rgba(255, 255, 255, 0.8);
  --shadow-inner: inset 4px 4px 8px rgba(0,0,0,0.05), inset -4px -4px 8px rgba(255,255,255,0.9);
  --glass-border: rgba(255, 255, 255, 0.4);
}

[data-theme='dark'] {
  --clay-bg: #0f172a;
  --clay-card-bg: rgba(30, 41, 59, 0.8);
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --accent-color: #60a5fa;
  --shadow-outer: 8px 8px 20px rgba(0, 0, 0, 0.4), -4px -4px 15px rgba(255, 255, 255, 0.03);
  --shadow-inner: inset 4px 4px 8px rgba(0,0,0,0.3), inset -2px -2px 5px rgba(255,255,255,0.05);
  --glass-border: rgba(255, 255, 255, 0.05);
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'Pretendard', -apple-system, BlinkMacSystemFont, system-ui, Roboto, sans-serif;
}

body {
  background-color: var(--clay-bg);
  color: var(--text-main);
  min-height: 100vh;
  transition: background-color 0.4s ease, color 0.4s ease;
  overflow-x: hidden;
}

/* Layout Containers */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem;
}

/* Clay Card */
.clay-card {
  background: var(--clay-card-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--glass-border);
  border-radius: 2rem;
  shadow: var(--shadow-outer);
  padding: 2.5rem;
  margin-bottom: 2rem;
  box-shadow: var(--shadow-outer);
  transition: transform 0.3s ease;
}

/* Clay Input */
.clay-input-wrapper {
  position: relative;
  width: 100%;
  margin-bottom: 1.5rem;
}

.clay-input {
  width: 100%;
  padding: 1.25rem 1.5rem;
  background: var(--clay-bg);
  border: none;
  border-radius: 1.25rem;
  color: var(--text-main);
  font-size: 1.1rem;
  font-weight: 600;
  box-shadow: var(--shadow-inner);
  outline: none;
  transition: box-shadow 0.3s ease, ring 0.3s ease;
}

.clay-input:focus {
  ring: 2px solid var(--accent-color);
  box-shadow: var(--shadow-inner), 0 0 0 2px var(--accent-color);
}

/* Clay Button */
.clay-button {
  padding: 1rem 2rem;
  border: none;
  border-radius: 1.25rem;
  font-weight: 800;
  cursor: pointer;
  background: var(--accent-color);
  color: white;
  box-shadow: var(--shadow-outer);
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
}

.clay-button:hover {
  transform: translateY(-2px) scale(1.02);
  filter: brightness(1.1);
}

.clay-button:active {
  transform: translateY(1px) scale(0.98);
  box-shadow: var(--shadow-inner);
}

.clay-button.secondary {
  background: var(--clay-card-bg);
  color: var(--text-main);
  border: 1px solid var(--glass-border);
}

/* Data Table / List Styling */
.list-container {
  width: 100%;
  overflow-x: auto;
  border-radius: 1.5rem;
  box-shadow: var(--shadow-inner);
  background: var(--clay-bg);
  margin-top: 1.5rem;
}

table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
}

thead {
  background: rgba(var(--accent-color), 0.1);
}

th {
  padding: 1.25rem;
  font-weight: 700;
  color: var(--text-muted);
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  border-bottom: 1px solid var(--glass-border);
  cursor: pointer;
  white-space: nowrap;
}

th:hover {
  color: var(--accent-color);
}

td {
  padding: 1.25rem;
  border-bottom: 1px solid var(--glass-border);
  font-size: 1rem;
  color: var(--text-main);
}

tr:last-child td {
  border-bottom: none;
}

tr:hover td {
  background: rgba(255, 255, 255, 0.05);
}

/* Toggle Switch */
.theme-switch {
  position: fixed;
  top: 2rem;
  right: 2rem;
  z-index: 1000;
}

/* Responsive */
@media (max-width: 768px) {
  .container {
    padding: 1rem;
  }
  .clay-card {
    padding: 1.5rem;
    border-radius: 1.5rem;
  }
}

/* Loading Animation */
.spinner {
  width: 40px;
  height: 40px;
  border: 4px solid rgba(var(--accent-color), 0.1);
  border-left-color: var(--accent-color);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

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