:root {
    /* Colors - Linear/Apple Inspired */
    --bg-app: #FFFFFF;
    --bg-panel-left: #FAFAFA;
    --bg-panel-right: #FFFFFF;
    --text-primary: #1A1A1A;
    --text-secondary: #6B7280;
    --text-tertiary: #9CA3AF;
    --border-subtle: #E5E7EB;
    --border-focus: #1A1A1A;
    --accent-primary: #1A1A1A;
    --accent-text: #FFFFFF;
    --surface-card: #FFFFFF;
    --surface-hover: #F3F4F6;

    /* Status Colors */
    --status-verified: #10B981;
    --status-verified-bg: #D1FAE5;
    --status-disproven: #EF4444;
    --status-disproven-bg: #FEE2E2;
    --status-unverified: #F59E0B;
    --status-unverified-bg: #FEF3C7;

    /* Metrics */
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;

    /* Fonts */
    --font-sans: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Inter", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; outline: none; }

body {
    margin: 0;
    padding: 0;
    font-family: var(--font-sans);
    color: var(--text-primary);
    background: var(--bg-app);
    height: 100vh;
    overflow: hidden;
    display: flex;
    font-size: 14px;
    line-height: 1.5;
}

/* Split Layout */
.app-container {
    display: flex;
    width: 100%;
    height: 100%;
}

/* Left Pane - Inputs */
.pane-left {
    width: 38%;
    min-width: 360px;
    max-width: 480px;
    background: var(--bg-panel-left);
    border-right: 1px solid var(--border-subtle);
    display: flex;
    flex-direction: column;
    overflow-y: auto;
    padding: var(--spacing-lg);
}

/* Right Pane - Results */
.pane-right {
    flex: 1;
    background: var(--bg-panel-right);
    padding: var(--spacing-lg);
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

/* Typography & Common */
h1 { font-size: 18px; font-weight: 600; margin: 0 0 var(--spacing-lg) 0; letter-spacing: -0.01em; display: flex; align-items: center; gap: 8px; }
h2 { font-size: 14px; font-weight: 600; margin: 0 0 var(--spacing-sm) 0; color: var(--text-secondary); text-transform: uppercase; letter-spacing: 0.05em; }
h3 { font-size: 15px; font-weight: 600; margin: 0; color: var(--text-primary); }
label { display: block; font-size: 13px; font-weight: 500; margin-bottom: 4px; color: var(--text-primary); }
.helper-text { font-size: 12px; color: var(--text-secondary); margin-top: 2px; margin-bottom: 0; }

/* Inputs */
.input-group { margin-bottom: var(--spacing-md); }

input[type="text"],
input[type="url"],
textarea {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    background: #FFFFFF;
    color: var(--text-primary);
    font-family: var(--font-sans);
    font-size: 14px;
    transition: all 0.2s ease;
    appearance: none;
}

input[type="text"]:focus,
input[type="url"]:focus,
textarea:focus {
    border-color: var(--border-focus);
    box-shadow: 0 0 0 1px var(--border-focus);
}

textarea { resize: vertical; min-height: 80px; }
.input-article { min-height: 160px; }

/* File Upload */
.file-upload-container {
    border: 1px dashed var(--border-subtle);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    text-align: center;
    background: #FFFFFF;
    transition: border-color 0.2s;
    position: relative;
}
.file-upload-container:hover { border-color: var(--text-tertiary); }
.file-upload-label { cursor: pointer; display: flex; flex-direction: column; align-items: center; gap: 8px; color: var(--text-secondary); font-size: 13px; }
input[type="file"] { display: none; }
.preview-container { display: none; margin-top: var(--spacing-sm); position: relative; }
.preview-container.active { display: block; }
.preview-img { max-width: 100%; height: auto; border-radius: var(--radius-sm); border: 1px solid var(--border-subtle); }
.btn-remove-file {
    position: absolute; top: -8px; right: -8px;
    background: white; border: 1px solid var(--border-subtle);
    border-radius: 50%; width: 24px; height: 24px;
    display: flex; align-items: center; justify-content: center;
    cursor: pointer; color: var(--text-secondary);
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

/* Buttons */
.actions {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}
button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 16px;
    border-radius: var(--radius-md);
    font-weight: 500;
    font-size: 14px;
    cursor: pointer;
    transition: all 0.2s;
}
button:disabled { opacity: 0.6; cursor: not-allowed; }
.btn-primary { background: var(--accent-primary); color: var(--accent-text); border: 1px solid var(--accent-primary); }
.btn-primary:hover { opacity: 0.9; }
.btn-secondary { background: white; color: var(--text-primary); border: 1px solid var(--border-subtle); }
.btn-secondary:hover { background: var(--surface-hover); }
.btn-ghost { background: transparent; color: var(--text-secondary); border: 1px solid transparent; }
.btn-ghost:hover { color: var(--status-disproven); }

/* Status & Log */
.status-container { margin-bottom: var(--spacing-md); }
#status { font-size: 12px; font-weight: 500; }
.status-ok { color: #059669; }
.status-warn { color: #d97706; }
.status-error { color: #dc2626; }
.loading-wrap { margin-top: var(--spacing-sm); }
.loading-bar { height: 6px; background: var(--surface-hover); border-radius: 999px; overflow: hidden; }
.loading-fill { height: 100%; width: 0%; background: linear-gradient(90deg, #10B981 0%, #F59E0B 55%, #EF4444 100%); transition: width 0.3s ease; }

/* Output Cards */
.card {
    background: var(--surface-card);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}
.card.fade {
    opacity: 0;
    transform: translateY(6px);
    transition: opacity 0.35s ease, transform 0.35s ease;
}
.card.visible {
    opacity: 1;
    transform: translateY(0);
}
.card-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: var(--spacing-sm); }

/* Verification Output */
.verdict-chip {
    padding: 4px 8px; border-radius: 99px; font-size: 11px; font-weight: 600; text-transform: uppercase; letter-spacing: 0.05em;
}
.verdict-verified { background: var(--status-verified-bg); color: var(--status-verified); }
.verdict-disproven { background: var(--status-disproven-bg); color: var(--status-disproven); }
.verdict-unverified { background: var(--status-unverified-bg); color: var(--status-unverified); }
.verdict-biased { background: var(--status-disproven-bg); color: var(--status-disproven); }
.verdict-neutral { background: var(--status-verified-bg); color: var(--status-verified); }
.verdict-pending { background: var(--status-unverified-bg); color: var(--status-unverified); }

.claim-text { font-size: 15px; margin-bottom: var(--spacing-sm); line-height: 1.4; }
.confidence-meter { display: flex; align-items: center; gap: 8px; font-size: 12px; color: var(--text-secondary); margin-bottom: var(--spacing-md); }
.conf-bar-bg { width: 100px; height: 4px; background: var(--surface-hover); border-radius: 2px; overflow: hidden; }
.conf-bar-fill { height: 100%; background: var(--text-secondary); }

.collapsible { border-top: 1px solid var(--border-subtle); padding-top: var(--spacing-sm); margin-top: var(--spacing-sm); }
.collapsible-header {
    display: flex; justify-content: space-between; align-items: center;
    cursor: pointer; font-size: 12px; font-weight: 500; color: var(--text-secondary);
}
.collapsible-header:hover { color: var(--text-primary); }
.collapsible-content { display: none; padding-top: var(--spacing-sm); font-size: 13px; color: var(--text-secondary); }
.collapsible-content.open { display: block; }
.source-item { margin-bottom: var(--spacing-sm); }
.source-link { color: var(--accent-primary); text-decoration: underline; display: block; margin-top: 4px; }
.source-excerpt { font-size: 12px; color: var(--text-secondary); margin-top: 4px; }

/* Carousel Nav */
.carousel-nav { display: flex; align-items: center; gap: 12px; margin-top: var(--spacing-md); justify-content: center; }
.nav-btn {
    background: white; border: 1px solid var(--border-subtle); width: 28px; height: 28px; border-radius: 50%;
    display: flex; align-items: center; justify-content: center; cursor: pointer; color: var(--text-secondary);
}
.nav-btn:hover { border-color: var(--text-primary); color: var(--text-primary); }
.nav-btn:disabled { opacity: 0.5; cursor: not-allowed; }
.nav-indicator { font-size: 12px; color: var(--text-secondary); font-feature-settings: "tnum"; }

/* Analysis Cards (Signal/Counter) */
.comparison-grid { display: grid; grid-template-columns: 1fr 1fr; gap: var(--spacing-md); }
.quote-box { background: var(--surface-hover); padding: 12px; border-radius: var(--radius-md); font-size: 13px; font-style: italic; color: var(--text-primary); border-left: 3px solid var(--border-subtle); }
.quote-box.signal { border-left-color: var(--accent-primary); }
.quote-box.counter { border-left-color: var(--text-tertiary); }
.analysis-detail { margin-top: var(--spacing-sm); font-size: 13px; color: var(--text-secondary); }

/* Summary */
.summary-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: var(--spacing-md); }
.persuasion-container { margin-top: var(--spacing-sm); }
.persuasion-header { display: flex; justify-content: space-between; font-size: 12px; font-weight: 500; margin-bottom: 4px; }
.meter-bg { height: 8px; background: var(--surface-hover); border-radius: 4px; overflow: hidden; position: relative; }
.meter-fill { height: 100%; background: linear-gradient(90deg, #10B981 0%, #F59E0B 50%, #EF4444 100%); width: 0%; transition: width 0.5s ease-out; }

.summary-notes {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}
.summary-note label { font-size: 11px; text-transform: uppercase; color: var(--text-secondary); letter-spacing: 0.06em; margin-bottom: 6px; }
.summary-text {
    font-size: 13px;
    color: var(--text-primary);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    padding: 8px 10px;
    background: #FFFFFF;
    min-height: 36px;
}
.summary-text.muted { color: var(--text-tertiary); }

.verification-counts { display: flex; gap: var(--spacing-md); margin-top: var(--spacing-md); border-top: 1px solid var(--border-subtle); padding-top: var(--spacing-md); }
.count-item { display: flex; flex-direction: column; align-items: center; flex: 1; }
.count-val { font-size: 18px; font-weight: 600; color: var(--text-primary); }
.count-label { font-size: 11px; text-transform: uppercase; color: var(--text-secondary); margin-top: 2px; }

/* Scrollbar */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: rgba(0,0,0,0.1); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: rgba(0,0,0,0.2); }

/* Icons */
.icon { width: 16px; height: 16px; stroke-width: 2; stroke: currentColor; fill: none; }
.icon-sm { width: 14px; height: 14px; }

@media (max-width: 980px) {
    body { height: auto; overflow: auto; }
    .app-container { flex-direction: column; height: auto; }
    .pane-left, .pane-right { width: 100%; max-width: none; height: auto; }
    .pane-left { border-right: none; border-bottom: 1px solid var(--border-subtle); }
    .comparison-grid { grid-template-columns: 1fr; }
    .summary-notes { grid-template-columns: 1fr; }
}