:root {
    --font-sans: ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
    --primary-color: #2383E2;
    --primary-hover: #1B6DC1;
    --primary-active: #155A9E;
    --text-color: rgb(25, 25, 24);
    --text-secondary: rgba(25, 25, 24, 0.65);
    --text-muted: rgba(25, 25, 24, 0.5);
    --bg-color: #fafafa;
    --card-bg: #ffffff;
    --border-color: rgba(55, 53, 47, 0.12);
    --hover-surface: rgba(55, 53, 47, 0.06);
    --selection-bg: rgba(35, 131, 226, 0.28);
    
    /* Spacing */
    --space-4: 4px;
    --space-6: 6px;
    --space-8: 8px;
    --space-12: 12px;
    --space-16: 16px;
    --space-20: 20px;
    --space-24: 24px;
    --space-32: 32px;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: var(--font-sans);
    color: var(--text-color);
    background-color: var(--bg-color);
    line-height: 1.55;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: var(--space-32) var(--space-24);
}

/* ========== APP HEADER ========== */
.app-header {
    text-align: center;
    margin-bottom: var(--space-24);
    padding: var(--space-16) var(--space-24);
    margin: calc(-1 * var(--space-32)) calc(-1 * var(--space-24)) var(--space-24);
}

.app-header__title {
    font-size: 36px;
    font-weight: 700;
    line-height: 1.15;
    letter-spacing: -0.025em;
    color: var(--text-color);
    margin: 0;
    padding-bottom: var(--space-16);
}

.app-header__title::after {
    content: '';
    display: block;
    width: 40%;
    height: 1px;
    background: var(--border-color);
    margin: var(--space-16) auto 0;
}

h3 {
    font-size: 22px;
    font-weight: 600;
    line-height: 1.35;
    letter-spacing: -0.005em;
    margin-bottom: var(--space-16);
}

h4 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: var(--space-8);
}

.card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: var(--space-24);
    margin-bottom: var(--space-24);
    box-shadow: 0 1px 2px rgba(0,0,0,0.04);
}

/* Input Section */
.drop-zone {
    border: 2px dashed var(--border-color);
    border-radius: 12px;
    padding: 48px 32px;
    text-align: center;
    cursor: pointer;
    transition: background 0.2s, border-color 0.2s;
    background: var(--hover-surface);
}

.drop-zone:hover, .drop-zone.dragover {
    background: rgba(35, 131, 226, 0.04);
    border-color: var(--primary-color);
}

.drop-zone-content .icon {
    font-size: 32px;
    display: block;
    margin-bottom: var(--space-12);
}

.drop-zone-content p {
    font-size: 18px;
    font-weight: 500;
    margin-bottom: var(--space-4);
}

.drop-zone-content .hint {
    font-size: 14px;
    color: var(--text-muted);
}

.divider {
    display: flex;
    align-items: center;
    margin: var(--space-24) 0;
}

.divider-line {
    flex: 1;
    height: 1px;
    background: rgba(55, 53, 47, 0.16);
}

.divider-text {
    padding: 0 var(--space-16);
    font-size: 12px;
    font-weight: 600;
    color: var(--text-muted);
    letter-spacing: 0.05em;
}

.url-group {
    display: flex;
    gap: var(--space-12);
}

input[type="text"] {
    flex: 1;
    padding: 10px 16px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 16px;
    outline: none;
    transition: border-color 0.2s, box-shadow 0.2s;
    font-family: var(--font-sans);
    background: var(--card-bg);
}

input[type="text"]:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px var(--selection-bg);
}

.primary-btn {
    background: #000000;
    color: white;
    border: none;
    border-radius: 50px;
    padding: 10px 20px;
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
    transition: background 0.2s;
    white-space: nowrap;
    font-family: var(--font-sans);
}

.primary-btn:hover { background: #1a1a1a; }
.primary-btn:active { background: #333333; }

.secondary-btn {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 10px 20px;
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
    transition: background 0.2s;
    font-family: var(--font-sans);
}

.secondary-btn:hover { background: var(--hover-surface); }

/* Loader */
.loader-section {
    text-align: center;
    padding: 40px 0;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--border-color);
    border-top: 3px solid var(--primary-color);
    border-radius: 50%;
    margin: 0 auto var(--space-16);
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Results */
.results-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-24);
}

.score-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.score-display {
    margin: var(--space-24) 0;
}

.score-circle {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    border: 8px solid var(--primary-color);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    margin-bottom: var(--space-16);
}

#score-value {
    font-size: 40px;
    font-weight: 700;
    line-height: 1;
}

.score-max {
    font-size: 14px;
    color: var(--text-muted);
}

.confidence-badge {
    display: inline-block;
    padding: 6px 12px;
    border-radius: 20px;
    font-weight: 600;
    font-size: 14px;
    text-transform: uppercase;
}

.badge-real { background: #e6f6ec; color: #0d5a34; }
.badge-ai { background: #feecef; color: #9b1c2e; }
.badge-unclear { background: #f1f1f0; color: #37352f; }

.verdict-text {
    font-size: 16px;
    color: var(--text-muted);
}

.preview-card .image-container {
    width: 100%;
    height: 250px;
    border-radius: 8px;
    overflow: hidden;
    background: #f1f1f0;
}

#image-preview {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.evidence-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-12);
}

.evidence-item {
    padding: var(--space-12);
    border-radius: 8px;
    background: #f9f9f9;
    border-left: 4px solid var(--primary-color);
}

.evidence-header {
    display: flex;
    justify-content: space-between;
    margin-bottom: 4px;
}

.signal-type { font-weight: 600; font-size: 14px; }
.importance {
    font-size: 11px;
    font-weight: 700;
    padding: 2px 6px;
    border-radius: 4px;
    background: #eee;
}

.observation { font-size: 15px; margin-bottom: 4px; }
.reasoning { font-size: 13px; color: var(--text-muted); font-style: italic; }

.analysis-groups {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-16);
}

ul {
    list-style: none;
    padding-left: 0;
}

ul li {
    font-size: 14px;
    margin-bottom: 6px;
    padding-left: 20px;
    position: relative;
}

#anomalies-list li::before { content: ""; position: absolute; left: 0; }
#strengths-list li::before { content: ""; position: absolute; left: 0; }

.actions {
    text-align: center;
    margin-top: var(--space-32);
}

/* Footer */
.footer {
    margin-top: 64px;
    padding-top: var(--space-24);
    border-top: 0.5px solid var(--border-color);
}

.warning-box {
    background: #fff8e6;
    border: 0.5px solid rgba(55, 53, 47, 0.16);
    padding: var(--space-16);
    border-radius: 8px;
    font-size: 14px;
    color: #856404;
}

.hidden { display: none !important; }

@media (max-width: 768px) {
    .container {
        padding: var(--space-24) var(--space-16);
    }
    
    .app-header {
        padding: var(--space-12) var(--space-16);
        margin: calc(-1 * var(--space-24)) calc(-1 * var(--space-16)) var(--space-20);
    }
    
    .app-header__title {
        font-size: 28px;
    }
    
    .results-grid { grid-template-columns: 1fr; }
    .url-group { flex-direction: column; }
    .analysis-groups { grid-template-columns: 1fr; }
    
    .drop-zone {
        padding: 32px 20px;
    }
}