:root {
    --primary-color: #667eea;
    --secondary-color: #764ba2;
    --success-color: #4caf50;
    --text-dark: #333333;
    --text-light: #ffffff;
    --bg-light: #f4f7f6;
    --card-bg: #ffffff;
    --transition: all 0.3s ease;
    --shadow: 0 10px 20px rgba(0,0,0,0.1);
    --border-radius: 12px;
}

* { margin: 0; padding: 0; box-sizing: border-box; font-family: 'Segoe UI', Roboto, sans-serif; }
body { background: var(--bg-light); color: var(--text-dark); min-height: 100vh; display: flex; flex-direction: column; transition: background-color 0.3s ease, color 0.3s ease; }

header { background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%); color: var(--text-light); padding: 1rem 0; box-shadow: 0 4px 6px rgba(0,0,0,0.1); }
.header-container { max-width: 1200px; margin: 0 auto; padding: 0 2rem; display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 1rem; }
.logo { font-size: 1.5rem; font-weight: 700; }
.header-controls { display: flex; gap: 10px; }
.lang-btn { background: rgba(255,255,255,0.2); border: 1px solid rgba(255,255,255,0.4); color: white; padding: 0.5rem 1rem; border-radius: 20px; cursor: pointer; font-weight: 600; transition: var(--transition); }
.lang-btn:hover { background: rgba(255,255,255,0.3); }

.container { max-width: 1200px; margin: 2rem auto; padding: 0 1rem; flex: 1; width: 100%; }
.card { background: var(--card-bg); border-radius: var(--border-radius); padding: 2rem; box-shadow: var(--shadow); margin-bottom: 2rem; transition: background-color 0.3s ease; }
h2 { color: var(--secondary-color); margin-bottom: 1.5rem; text-align: center; }

.drop-zone { border: 2px dashed var(--primary-color); border-radius: var(--border-radius); padding: 3rem 1rem; text-align: center; cursor: pointer; transition: var(--transition); background: rgba(102, 126, 234, 0.05); }
.drop-zone.dragover { background: rgba(102, 126, 234, 0.15); border-color: var(--secondary-color); transform: scale(1.02); }
.upload-icon { font-size: 3rem; display: block; margin-bottom: 1rem; }
.sub-text { color: #666; font-size: 0.9rem; margin-top: 0.5rem; }

#previewContainer { margin-top: 2rem; text-align: center; }
#imagePreview { max-width: 100%; max-height: 300px; border-radius: 8px; box-shadow: 0 4px 8px rgba(0,0,0,0.1); object-fit: contain; }
.metadata { margin: 1rem 0; font-size: 0.9rem; color: #555; background: #f0f0f0; padding: 0.5rem 1rem; border-radius: 6px; display: inline-block; transition: background-color 0.3s ease, color 0.3s ease; }

.btn { border: none; border-radius: 6px; padding: 0.75rem 1.5rem; font-size: 1rem; font-weight: 600; cursor: pointer; transition: var(--transition); display: inline-flex; align-items: center; justify-content: center; gap: 0.5rem; }
.primary-btn { background: var(--primary-color); color: white; width: 100%; max-width: 300px; }
.primary-btn:hover:not(:disabled) { background: var(--secondary-color); transform: translateY(-2px); }
.primary-btn:disabled { opacity: 0.7; cursor: not-allowed; }
.copy-btn, .download-btn { background: #f0f0f0; color: var(--text-dark); width: 100%; margin-top: 0.5rem; transition: background-color 0.3s ease, color 0.3s ease; }
.copy-btn:hover, .download-btn:hover { background: #e0e0e0; }

.results-grid { display: grid; grid-template-columns: 1fr; gap: 2rem; }
.overall-score-container { text-align: center; margin-bottom: 2rem; }
.overall-score-circle { width: 120px; height: 120px; border-radius: 50%; background: conic-gradient(var(--success-color) 0%, #e0e0e0 0%); display: flex; align-items: center; justify-content: center; margin: 1rem auto; font-size: 2rem; font-weight: bold; color: var(--text-dark); position: relative; transition: background 1s ease-out; }
.overall-score-circle::before { content: ""; position: absolute; inset: 10px; background: var(--card-bg); border-radius: 50%; z-index: 1; transition: background-color 0.3s ease;}
.overall-score-circle span, .overall-score-circle small { position: relative; z-index: 2; }

.dimension { margin-bottom: 1rem; }
.dim-header { display: flex; justify-content: space-between; margin-bottom: 0.5rem; font-weight: 500; }
.progress-bar { height: 10px; background: #e0e0e0; border-radius: 5px; overflow: hidden; transition: background-color 0.3s ease; }
.progress { height: 100%; background: var(--primary-color); width: 0%; transition: width 1s ease-in-out; }

.prompts-header { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 1rem; margin-bottom: 1.5rem; }
.filter-btn { background: #f0f0f0; border: 1px solid #ddd; padding: 0.5rem 1rem; border-radius: 20px; cursor: pointer; font-weight: 600; color: var(--text-dark); transition: var(--transition); display: flex; align-items: center; gap: 0.5rem; }
.filter-btn:hover { background: #e4e4e4; }
.filter-btn.active { background: var(--primary-color); color: white; border-color: var(--primary-color); }
.hidden-filter { display: none !important; }

.prompts-grid { display: grid; grid-template-columns: 1fr; gap: 1rem; }
.prompt-card { border: 1px solid #eee; padding: 1.5rem; border-radius: 8px; transition: var(--transition); }
.prompt-card:hover { box-shadow: 0 4px 12px rgba(0,0,0,0.08); border-color: var(--primary-color); transform: translateY(-2px); }
.card-header { display: flex; justify-content: space-between; align-items: flex-start; gap: 1rem; margin-bottom: 1rem; }
.card-header h4 { margin: 0; font-size: 1.05rem; line-height: 1.3; }
.fav-btn { background: none; border: none; font-size: 1.5rem; color: #ccc; cursor: pointer; transition: transform 0.2s ease, color 0.2s ease; line-height: 1; padding: 0; }
.fav-btn:hover { transform: scale(1.15); }
.fav-btn.active { color: #ffc107; }

/* History & Analytics */
.history-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 1.5rem; flex-wrap: wrap; gap: 1rem; }
.history-list { display: flex; flex-direction: column; gap: 1rem; }
.history-item { display: flex; align-items: center; flex-wrap: wrap; gap: 1.5rem; padding: 1rem; border: 1px solid #eee; border-radius: var(--border-radius); background: var(--bg-light); transition: var(--transition); }
.history-thumb { width: 80px; height: 80px; object-fit: cover; border-radius: 8px; border: 1px solid #ddd; }
.history-info { flex: 1; min-width: 150px; }
.history-meta { font-size: 0.85rem; color: #666; }
.danger-btn { background: #ff4d4f; color: white; width: auto; padding: 0.5rem 1rem; }
.danger-btn:hover { background: #d9363e; }
.empty-state { text-align: center; padding: 2rem; color: #888; font-style: italic; background: #fafafa; border-radius: 8px; border: 1px dashed #ccc; }

.analytics-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 1.5rem; }
.stat-card { background: var(--bg-light); border: 1px solid #eee; padding: 1.5rem; border-radius: var(--border-radius); text-align: center; }
.stat-card h3 { font-size: 0.95rem; color: #666; margin-bottom: 0.5rem; text-transform: uppercase; }
.stat-value { font-size: 2.5rem; font-weight: bold; color: var(--primary-color); }
.stat-list { font-size: 0.95rem; font-weight: 600; display: flex; flex-direction: column; gap: 0.3rem; }
.chart-container { background: var(--bg-light); border: 1px solid #eee; padding: 1.5rem; border-radius: var(--border-radius); grid-column: span 2; display: flex; flex-direction: column; align-items: center; }
canvas { max-width: 100%; height: auto; }

/* Utils */
.hidden { display: none !important; }
.fade-in { animation: fadeIn 0.5s ease-in; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: translateY(0); } }
.spinner { width: 20px; height: 20px; border: 3px solid rgba(255,255,255,0.3); border-radius: 50%; border-top-color: #fff; animation: spin 1s infinite linear; }
@keyframes spin { to { transform: rotate(360deg); } }
.toast { position: fixed; bottom: 2rem; right: 2rem; background: var(--success-color); color: white; padding: 1rem 2rem; border-radius: 8px; box-shadow: 0 4px 12px rgba(0,0,0,0.15); z-index: 1000; font-weight: bold; transition: var(--transition); opacity: 1; transform: translateY(0); }
.toast.hidden { opacity: 0; transform: translateY(20px); pointer-events: none; }
footer { text-align: center; padding: 1.5rem; color: #666; margin-top: auto; }

/* Dark Mode Variables Override */
[data-theme="dark"] { --bg-light: #1a1a1a; --card-bg: #2d2d2d; --text-dark: #ffffff; }
[data-theme="dark"] .prompt-card, [data-theme="dark"] .history-item, [data-theme="dark"] .stat-card, [data-theme="dark"] .chart-container { border-color: #444; }
[data-theme="dark"] .history-item, [data-theme="dark"] .stat-card, [data-theme="dark"] .chart-container { background: #333; }
[data-theme="dark"] .metadata, [data-theme="dark"] .copy-btn, [data-theme="dark"] .download-btn, [data-theme="dark"] .progress-bar { background: #444; color: #fff; }
[data-theme="dark"] .copy-btn:hover, [data-theme="dark"] .download-btn:hover { background: #555; }
[data-theme="dark"] .sub-text, [data-theme="dark"] .overall-score-circle small, [data-theme="dark"] .history-meta, [data-theme="dark"] .stat-card h3 { color: #aaa; }
[data-theme="dark"] .filter-btn { background: #444; border-color: #555; color: #fff; }
[data-theme="dark"] .filter-btn.active { background: var(--primary-color); border-color: var(--primary-color); }
[data-theme="dark"] .fav-btn { color: #666; }
[data-theme="dark"] .fav-btn.active { color: #ffda6a; }
[data-theme="dark"] .empty-state { background: #2a2a2a; border-color: #444; color: #aaa; }

/* Responsive Desktop */
@media (min-width: 768px) {
    .results-grid { grid-template-columns: 1fr 1.5fr; }
    .prompts-grid { grid-template-columns: 1fr 1fr; }
}
@media (min-width: 1024px) {
    .results-grid { grid-template-columns: 1fr 2fr; }
    .prompts-grid { grid-template-columns: repeat(3, 1fr); }
}
@media (max-width: 768px) {
    .chart-container { grid-column: span 1; }
}