:root {
  --bg-color: #fafafa;
  --card-bg: #ffffff;
  --text-main: #18181b;
  --text-muted: #71717a;
  --border-color: #e4e4e7;
  --accent: #18181b;
  --accent-hover: #27272a;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
  --radius: 16px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg-color: #09090b;
    --card-bg: #18181b;
    --text-main: #f4f4f5;
    --text-muted: #a1a1aa;
    --border-color: #27272a;
    --accent: #f4f4f5;
    --accent-hover: #e4e4e7;
  }
}

* { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: var(--font-sans); background-color: var(--bg-color); color: var(--text-main); min-height: 100vh; display: flex; justify-content: center; padding: 40px 20px; transition: background-color 0.3s; }
.app-container { width: 100%; max-width: 800px; display: flex; flex-direction: column; gap: 32px; }

.hero { text-align: center; }
.hero h1 { font-size: 2.25rem; font-weight: 800; letter-spacing: -0.05em; margin-bottom: 8px; }
.hero p { color: var(--text-muted); font-size: 0.95rem; }

.creation-card { background: var(--card-bg); border: 1px solid var(--border-color); border-radius: var(--radius); padding: 24px; box-shadow: var(--shadow-md); display: flex; flex-direction: column; gap: 20px; }

.tabs-selector { display: flex; background: var(--bg-color); padding: 4px; border-radius: 10px; border: 1px solid var(--border-color); }
.tab-btn { flex: 1; border: none; background: transparent; padding: 10px; border-radius: 8px; color: var(--text-muted); font-weight: 600; font-size: 0.9rem; cursor: pointer; display: flex; align-items: center; justify-content: center; gap: 8px; transition: all 0.2s; }
.tab-btn svg { width: 16px; height: 16px; }
.tab-btn.active { background: var(--card-bg); color: var(--text-main); box-shadow: 0 1px 3px rgba(0,0,0,0.05); }

.tab-content { display: flex; flex-direction: column; gap: 16px; }

.input-wrapper { position: relative; display: flex; align-items: center; }
.input-wrapper input { width: 100%; background: transparent; border: 1px solid var(--border-color); padding: 16px 64px 16px 16px; font-size: 1.1rem; border-radius: var(--radius); color: var(--text-main); outline: none; }
#char-counter { position: absolute; right: 16px; font-size: 0.8rem; color: var(--text-muted); font-weight: 600; }
#char-counter.warning { color: #ef4444; }
.color-selector { display: flex; gap: 10px; justify-content: center; }
.color-btn { width: 26px; height: 26px; border-radius: 50%; border: 2px solid transparent; cursor: pointer; box-shadow: inset 0 0 0 1px rgba(0, 0, 0, 0.08); }
.color-btn.active { border-color: var(--text-main); transform: scale(1.1); }

.upload-wrapper { border: 2px dashed var(--border-color); border-radius: var(--radius); padding: 30px; text-align: center; cursor: pointer; position: relative; min-height: 140px; display: flex; align-items: center; justify-content: center; }
.upload-wrapper.dragover { border-color: var(--text-main); }
.upload-content { display: flex; flex-direction: column; align-items: center; gap: 8px; color: var(--text-muted); font-size: 0.9rem; }
.upload-content svg { width: 28px; height: 28px; }
.preview-container { width: 100%; height: 100%; position: absolute; top: 0; left: 0; }
.preview-container img { width: 100%; height: 100%; object-fit: cover; border-radius: var(--radius); }
#remove-preview-btn { position: absolute; top: 8px; right: 8px; background: rgba(0,0,0,0.6); border: none; color: white; padding: 4px; border-radius: 50%; cursor: pointer; display: flex; }

#submit-btn { background: var(--accent); color: var(--bg-color); border: none; border-radius: var(--radius); padding: 14px; font-weight: 600; cursor: pointer; display: flex; align-items: center; justify-content: center; gap: 8px; }
#submit-btn:disabled { opacity: 0.3; cursor: not-allowed; }
#cooldown-message { text-align: center; font-size: 0.85rem; color: #ef4444; font-weight: 500; }

.hidden { display: none !important; }

.wall-controls { display: flex; justify-content: space-between; align-items: center; gap: 16px; }
.search-bar { position: relative; flex: 1; }
.search-bar svg { position: absolute; left: 14px; top: 50%; transform: translateY(-50%); width: 16px; color: var(--text-muted); }
.search-bar input { width: 100%; background: var(--card-bg); border: 1px solid var(--border-color); padding: 10px 12px 10px 40px; border-radius: var(--radius); color: var(--text-main); outline: none; }
.stats { font-size: 0.85rem; color: var(--text-muted); font-weight: 500; }

.grid-wall { display: grid; grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); gap: 16px; }

.wall-item { background: var(--card-bg); border: 1px solid var(--border-color); border-radius: var(--radius); overflow: hidden; aspect-ratio: 1 / 1; box-shadow: 0 2px 4px rgba(0,0,0,0.02); display: flex; align-items: center; justify-content: center; transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.3s; }
.wall-item:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }

.item-word { padding: 16px; font-size: 1.1rem; font-weight: 700; color: #1a1a1a; text-align: center; border: 1px solid rgba(0,0,0,0.05); transform: rotate(var(--rotation, 0deg)); }

.item-image img { width: 100%; height: 100%; object-fit: cover; }

@keyframes pop { 0% { transform: scale(0.95); opacity: 0; } 100% { transform: scale(1); opacity: 1; } }
.pop-in { animation: pop 0.4s cubic-bezier(0.16, 1, 0.3, 1) forwards; }