:root {
    --bg-dark: #0b0f19;
    --card-bg: rgba(18, 24, 38, 0.75);
    --card-border: rgba(255, 255, 255, 0.08);
    --card-hover-border: rgba(99, 102, 241, 0.4);
    
    --primary: #6366f1;
    --primary-hover: #4f46e5;
    --primary-glow: rgba(99, 102, 241, 0.35);
    --accent-cyan: #06b6d4;
    --accent-pink: #ec4899;
    --accent-emerald: #10b981;
    --accent-amber: #f59e0b;
    --accent-rose: #f43f5e;
    
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --text-dim: #64748b;
    
    --dropzone-bg: rgba(15, 23, 42, 0.6);
    --dropzone-border: rgba(99, 102, 241, 0.3);
    --dropzone-hover: rgba(99, 102, 241, 0.12);

    --radius-sm: 8px;
    --radius-md: 14px;
    --radius-lg: 20px;
    --radius-xl: 28px;
    
    --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-smooth: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, sans-serif;
    background-color: var(--bg-dark);
    color: var(--text-main);
    min-height: 100vh;
    overflow-x: hidden;
    line-height: 1.5;
}

/* Glowing background ambient lights */
.app-background {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: 0;
    pointer-events: none;
    overflow: hidden;
}

.glow-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(120px);
    opacity: 0.25;
}

.orb-1 {
    top: -10%;
    left: 20%;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, var(--primary) 0%, rgba(99, 102, 241, 0) 70%);
}

.orb-2 {
    bottom: -15%;
    right: 10%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, var(--accent-cyan) 0%, rgba(6, 182, 212, 0) 70%);
}

.orb-3 {
    top: 40%;
    left: -10%;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, var(--accent-pink) 0%, rgba(236, 72, 153, 0) 70%);
}

/* App Container Layout */
.app-container {
    position: relative;
    z-index: 1;
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 2rem;
    min-height: 100vh;
}

/* Header */
.app-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--card-border);
    flex-wrap: wrap;
    gap: 1rem;
}

.brand {
    display: flex;
    align-items: center;
    gap: 0.85rem;
}

.brand-icon {
    width: 46px;
    height: 46px;
    border-radius: 12px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--accent-cyan) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.35rem;
    color: #fff;
    box-shadow: 0 8px 20px var(--primary-glow);
}

.brand-text h1 {
    font-size: 1.5rem;
    font-weight: 800;
    letter-spacing: -0.02em;
    background: linear-gradient(135deg, #ffffff 0%, #cbd5e1 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.badge-pro {
    font-size: 0.72rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--accent-cyan);
}

/* Nav Tabs */
.nav-tabs {
    display: flex;
    background: rgba(15, 23, 42, 0.7);
    padding: 0.35rem;
    border-radius: var(--radius-md);
    border: 1px solid var(--card-border);
    gap: 0.4rem;
}

.nav-tab-btn {
    background: none;
    border: none;
    color: var(--text-muted);
    padding: 0.6rem 1.25rem;
    border-radius: var(--radius-sm);
    font-size: 0.92rem;
    font-weight: 700;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.55rem;
    transition: var(--transition-fast);
    font-family: inherit;
}

.nav-tab-btn:hover {
    color: var(--text-main);
    background: rgba(255, 255, 255, 0.04);
}

.nav-tab-btn.active {
    background: var(--primary);
    color: #fff;
    box-shadow: 0 4px 15px var(--primary-glow);
}

.btn-text {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    border-radius: var(--radius-sm);
    transition: var(--transition-fast);
}

.btn-text:hover {
    color: var(--text-main);
    background: rgba(255, 255, 255, 0.05);
}

/* Tab Views */
.tab-view {
    animation: fadeIn 0.4s ease-out;
}

/* Converter Card Studio */
.converter-card {
    position: relative;
    background: var(--card-bg);
    backdrop-filter: blur(20px);
    border: 1px solid var(--card-border);
    border-radius: var(--radius-xl);
    padding: 2.5rem;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
    display: flex;
    flex-direction: column;
    gap: 2rem;
    overflow: hidden;
}

.card-header h2 {
    font-size: 1.65rem;
    font-weight: 700;
    letter-spacing: -0.01em;
    margin-bottom: 0.4rem;
}

.subtitle {
    color: var(--text-muted);
    font-size: 0.95rem;
}

/* Dropzone */
.dropzone-wrapper {
    width: 100%;
}

.dropzone {
    border: 2px dashed var(--dropzone-border);
    background: var(--dropzone-bg);
    border-radius: var(--radius-lg);
    padding: 3rem 2rem;
    text-align: center;
    transition: var(--transition-smooth);
    cursor: pointer;
    position: relative;
}

.dropzone:hover, .dropzone.dragover {
    border-color: var(--primary);
    background: var(--dropzone-hover);
    box-shadow: 0 0 30px var(--primary-glow);
    transform: translateY(-2px);
}

.upload-icon-wrapper {
    width: 64px;
    height: 64px;
    border-radius: 50%;
    background: rgba(99, 102, 241, 0.15);
    color: var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.8rem;
    margin: 0 auto 1.2rem;
    transition: var(--transition-fast);
}

.dropzone:hover .upload-icon-wrapper {
    transform: scale(1.1);
    background: var(--primary);
    color: #fff;
}

.dropzone-content h3 {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 0.4rem;
}

.dropzone-content p {
    color: var(--text-muted);
    font-size: 0.92rem;
    margin-bottom: 1.5rem;
}

.btn-browse {
    background: none;
    border: none;
    color: var(--accent-cyan);
    font-weight: 700;
    text-decoration: underline;
    cursor: pointer;
    font-size: 0.92rem;
    font-family: inherit;
}

.supported-tags {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.5rem;
}

.tag {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--card-border);
    padding: 0.25rem 0.65rem;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-muted);
}

/* File Preview Card */
.file-preview-card {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: rgba(30, 41, 59, 0.8);
    border: 1px solid var(--primary-glow);
    border-radius: var(--radius-md);
    padding: 1.25rem 1.5rem;
}

.file-info-main {
    display: flex;
    align-items: center;
    gap: 1rem;
    text-align: left;
}

.file-type-icon {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    background: var(--primary-glow);
    color: var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
}

.file-details h4 {
    font-size: 1.05rem;
    font-weight: 700;
    word-break: break-all;
}

.file-meta {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.82rem;
    color: var(--text-muted);
    margin-top: 0.2rem;
}

.detected-badge {
    background: rgba(6, 182, 212, 0.15);
    color: var(--accent-cyan);
    border: 1px solid rgba(6, 182, 212, 0.3);
    padding: 0.15rem 0.5rem;
    border-radius: 4px;
    font-weight: 600;
}

.btn-remove-file {
    background: rgba(255, 255, 255, 0.05);
    border: none;
    color: var(--text-muted);
    width: 36px;
    height: 36px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition-fast);
}

.btn-remove-file:hover {
    background: rgba(239, 68, 68, 0.2);
    color: #ef4444;
}

/* Target Format Selection */
.format-selection-area {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
    animation: fadeIn 0.4s ease-out;
}

.section-title {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--text-main);
}

.section-title i {
    color: var(--accent-pink);
}

.target-formats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
    gap: 0.85rem;
}

.format-card-btn {
    background: rgba(255, 255, 255, 0.03);
    border: 1.5px solid var(--card-border);
    border-radius: var(--radius-md);
    padding: 1rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    cursor: pointer;
    transition: var(--transition-fast);
    color: var(--text-muted);
}

.format-card-btn:hover {
    border-color: var(--card-hover-border);
    background: rgba(255, 255, 255, 0.07);
    color: var(--text-main);
    transform: translateY(-2px);
}

.format-card-btn.active {
    border-color: var(--primary);
    background: rgba(99, 102, 241, 0.15);
    color: var(--text-main);
    box-shadow: 0 0 20px var(--primary-glow);
}

.format-card-btn i {
    font-size: 1.6rem;
}

.format-card-btn span {
    font-size: 0.88rem;
    font-weight: 700;
    text-transform: uppercase;
}

/* Convert Button */
.action-bar {
    margin-top: 1rem;
}

.btn-convert {
    width: 100%;
    padding: 1rem 2rem;
    border-radius: var(--radius-md);
    background: linear-gradient(135deg, var(--primary) 0%, var(--accent-cyan) 100%);
    border: none;
    color: #fff;
    font-size: 1.05rem;
    font-weight: 700;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    box-shadow: 0 10px 25px var(--primary-glow);
    transition: var(--transition-fast);
    font-family: inherit;
}

.btn-convert:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 14px 30px rgba(99, 102, 241, 0.5);
}

.btn-convert:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

/* Status & Loading Overlay */
.conversion-status-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(11, 15, 25, 0.92);
    backdrop-filter: blur(10px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10;
    animation: fadeIn 0.3s ease-out;
}

.status-content {
    text-align: center;
    max-width: 400px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

.spinner-ring {
    width: 60px;
    height: 60px;
    border: 4px solid rgba(255, 255, 255, 0.1);
    border-top: 4px solid var(--accent-cyan);
    border-right: 4px solid var(--primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

.progress-bar-track {
    width: 100%;
    height: 6px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 10px;
    overflow: hidden;
    margin-top: 0.5rem;
}

.progress-bar-fill {
    width: 0%;
    height: 100%;
    background: linear-gradient(90deg, var(--primary), var(--accent-cyan));
    transition: width 0.3s linear;
}

/* Success Result View */
.conversion-result-card {
    text-align: center;
    padding: 2rem 1rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.25rem;
    animation: fadeIn 0.4s ease-out;
}

.result-icon {
    width: 72px;
    height: 72px;
    border-radius: 50%;
    background: rgba(16, 185, 129, 0.15);
    color: var(--accent-emerald);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.5rem;
}

.result-actions {
    display: flex;
    gap: 1rem;
    width: 100%;
    max-width: 500px;
    margin-top: 1rem;
}

.btn-download {
    flex: 2;
    padding: 0.9rem 1.5rem;
    border-radius: var(--radius-md);
    background: linear-gradient(135deg, var(--accent-emerald) 0%, #059669 100%);
    border: none;
    color: #fff;
    font-size: 1rem;
    font-weight: 700;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.6rem;
    box-shadow: 0 10px 25px rgba(16, 185, 129, 0.3);
    transition: var(--transition-fast);
    font-family: inherit;
}

.btn-download:hover {
    transform: translateY(-2px);
    box-shadow: 0 14px 30px rgba(16, 185, 129, 0.5);
}

.btn-secondary {
    flex: 1;
    padding: 0.9rem 1.5rem;
    border-radius: var(--radius-md);
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--card-border);
    color: var(--text-main);
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    transition: var(--transition-fast);
    font-family: inherit;
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
}

/* Mode Subtabs (Compare vs Formatter) */
.mode-subtabs {
    display: flex;
    border-bottom: 1px solid var(--card-border);
    padding-bottom: 1rem;
    gap: 1rem;
}

.subtab-btn {
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 1rem;
    font-weight: 700;
    padding: 0.5rem 1rem;
    border-radius: var(--radius-sm);
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.6rem;
    transition: var(--transition-fast);
    font-family: inherit;
}

.subtab-btn:hover {
    color: var(--text-main);
    background: rgba(255, 255, 255, 0.04);
}

.subtab-btn.active {
    color: var(--accent-cyan);
    background: rgba(6, 182, 212, 0.12);
    border: 1px solid rgba(6, 182, 212, 0.3);
}

/* Compare Inputs Grid */
.compare-inputs-grid {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: 1rem;
    align-items: center;
}

.compare-doc-card {
    background: rgba(15, 23, 42, 0.6);
    border: 1px solid var(--card-border);
    border-radius: var(--radius-lg);
    padding: 1.25rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.compare-card-title {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.doc-badge {
    font-size: 0.8rem;
    font-weight: 700;
    text-transform: uppercase;
    padding: 0.2rem 0.65rem;
    border-radius: 20px;
}

.doc-badge.doc-1 {
    background: rgba(99, 102, 241, 0.2);
    color: var(--primary);
    border: 1px solid var(--primary-glow);
}

.doc-badge.doc-2 {
    background: rgba(236, 72, 153, 0.2);
    color: var(--accent-pink);
    border: 1px solid rgba(236, 72, 153, 0.3);
}

.input-mode-toggle {
    display: flex;
    background: rgba(255, 255, 255, 0.05);
    padding: 0.2rem;
    border-radius: 6px;
    gap: 0.2rem;
}

.btn-toggle {
    background: none;
    border: none;
    color: var(--text-dim);
    font-size: 0.75rem;
    font-weight: 600;
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
    cursor: pointer;
    font-family: inherit;
}

.btn-toggle.active {
    background: rgba(255, 255, 255, 0.15);
    color: var(--text-main);
}

.mini-dropzone {
    border: 2px dashed rgba(255, 255, 255, 0.12);
    border-radius: var(--radius-md);
    padding: 2rem 1rem;
    text-align: center;
    cursor: pointer;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    transition: var(--transition-fast);
}

.mini-dropzone:hover {
    border-color: var(--primary);
    background: rgba(99, 102, 241, 0.08);
}

.mini-dropzone i {
    font-size: 1.8rem;
    color: var(--text-muted);
}

.file-ext-badge {
    font-size: 0.72rem;
    font-weight: 700;
    color: var(--accent-cyan);
    background: rgba(6, 182, 212, 0.15);
    padding: 0.1rem 0.4rem;
    border-radius: 4px;
}

.text-input-container textarea {
    width: 100%;
    height: 120px;
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid var(--card-border);
    border-radius: var(--radius-sm);
    padding: 0.75rem;
    color: var(--text-main);
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.85rem;
    resize: vertical;
}

.vs-divider {
    display: flex;
    align-items: center;
    justify-content: center;
}

.vs-circle {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary) 0%, var(--accent-pink) 100%);
    color: #fff;
    font-weight: 800;
    font-size: 0.82rem;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 15px rgba(236, 72, 153, 0.4);
}

/* Validation Banner */
.validation-banner {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    background: rgba(239, 68, 68, 0.15);
    border: 1px solid rgba(239, 68, 68, 0.3);
    color: #f87171;
    padding: 0.75rem 1rem;
    border-radius: var(--radius-md);
    font-size: 0.9rem;
    font-weight: 600;
}

/* Diff Results View */
.diff-results-wrapper {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    animation: fadeIn 0.4s ease-out;
}

.diff-header-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: rgba(30, 41, 59, 0.6);
    border: 1px solid var(--card-border);
    border-radius: var(--radius-md);
    padding: 1rem 1.5rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.similarity-score {
    display: flex;
    flex-direction: column;
}

.score-label {
    font-size: 0.78rem;
    color: var(--text-muted);
    font-weight: 600;
    text-transform: uppercase;
}

.score-value {
    font-size: 1.8rem;
    font-weight: 800;
    color: var(--accent-emerald);
}

.diff-stats-tags {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.stat-tag {
    font-size: 0.82rem;
    font-weight: 700;
    padding: 0.25rem 0.65rem;
    border-radius: 6px;
}

.tag-added { background: rgba(16, 185, 129, 0.2); color: var(--accent-emerald); }
.tag-deleted { background: rgba(244, 63, 94, 0.2); color: var(--accent-rose); }
.tag-modified { background: rgba(245, 158, 11, 0.2); color: var(--accent-amber); }
.tag-unchanged { background: rgba(255, 255, 255, 0.06); color: var(--text-muted); }

.diff-viewer-container {
    background: #0d1117;
    border: 1px solid var(--card-border);
    border-radius: var(--radius-md);
    max-height: 450px;
    overflow-y: auto;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.84rem;
}

.diff-table {
    display: flex;
    flex-direction: column;
}

.diff-row {
    display: grid;
    grid-template-columns: 45px 1fr 45px 1fr;
    border-bottom: 1px solid rgba(255, 255, 255, 0.03);
}

.diff-num {
    padding: 0.35rem 0.5rem;
    text-align: right;
    color: var(--text-dim);
    background: rgba(0, 0, 0, 0.2);
    user-select: none;
}

.diff-text {
    padding: 0.35rem 0.75rem;
    white-space: pre-wrap;
    word-break: break-all;
}

.diff-row.added { background: rgba(16, 185, 129, 0.12); color: #a7f3d0; }
.diff-row.deleted { background: rgba(244, 63, 94, 0.12); color: #fecdd3; }
.diff-row.modified { background: rgba(245, 158, 11, 0.12); color: #fef08a; }
.diff-row.unchanged { color: var(--text-muted); }

/* Formatter & Editor Studio */
.formatter-toolbar {
    display: flex;
    flex-wrap: wrap;
    gap: 0.6rem;
    background: rgba(15, 23, 42, 0.6);
    padding: 0.85rem;
    border-radius: var(--radius-md);
    border: 1px solid var(--card-border);
    align-items: center;
}

.btn-tool {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--card-border);
    color: var(--text-main);
    padding: 0.5rem 0.9rem;
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 0.45rem;
    transition: var(--transition-fast);
    font-family: inherit;
}

.btn-tool:hover {
    background: rgba(255, 255, 255, 0.12);
    border-color: var(--card-hover-border);
}

.btn-tool.accent-btn {
    background: rgba(99, 102, 241, 0.2);
    border-color: var(--primary);
    color: var(--primary);
}

.btn-tool.accent-btn-green {
    background: rgba(16, 185, 129, 0.2);
    border-color: var(--accent-emerald);
    color: var(--accent-emerald);
}

.select-tool {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--card-border);
    color: var(--text-main);
    padding: 0.5rem 0.8rem;
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    font-weight: 600;
    font-family: inherit;
    cursor: pointer;
}

.select-tool option {
    background: var(--bg-dark);
    color: var(--text-main);
}

.editor-panes-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.25rem;
}

.editor-pane {
    display: flex;
    flex-direction: column;
    background: rgba(15, 23, 42, 0.6);
    border: 1px solid var(--card-border);
    border-radius: var(--radius-md);
    overflow: hidden;
}

.pane-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.6rem 1rem;
    background: rgba(30, 41, 59, 0.6);
    border-bottom: 1px solid var(--card-border);
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--text-muted);
}

.btn-sm-text {
    background: none;
    border: none;
    color: var(--accent-rose);
    font-weight: 700;
    font-size: 0.78rem;
    cursor: pointer;
}

.char-count {
    font-size: 0.78rem;
    color: var(--accent-cyan);
}

.editor-pane textarea {
    width: 100%;
    height: 350px;
    background: transparent;
    border: none;
    padding: 1rem;
    color: var(--text-main);
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.88rem;
    line-height: 1.6;
    resize: none;
    outline: none;
}

/* Secondary Grid Section */
.secondary-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
}

.info-card {
    background: var(--card-bg);
    backdrop-filter: blur(20px);
    border: 1px solid var(--card-border);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.card-header-sm {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    color: var(--accent-cyan);
}

.card-header-sm h3 {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text-main);
}

.history-list {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    max-height: 240px;
    overflow-y: auto;
}

.empty-state {
    text-align: center;
    padding: 2rem 0;
    color: var(--text-dim);
    font-size: 0.9rem;
}

.empty-state i {
    font-size: 1.8rem;
    margin-bottom: 0.5rem;
}

.history-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: rgba(255, 255, 255, 0.03);
    padding: 0.75rem 1rem;
    border-radius: var(--radius-sm);
    font-size: 0.88rem;
}

.history-item-left {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.history-item-names {
    display: flex;
    flex-direction: column;
}

.history-filename {
    font-weight: 600;
}

.history-meta {
    font-size: 0.75rem;
    color: var(--text-dim);
}

.btn-history-download {
    color: var(--accent-cyan);
    background: none;
    border: none;
    cursor: pointer;
    font-size: 1.1rem;
}

.formats-matrix-list {
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
    max-height: 240px;
    overflow-y: auto;
}

.matrix-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 0.85rem;
    padding: 0.4rem 0.6rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.04);
}

.matrix-fmt {
    font-family: 'JetBrains Mono', monospace;
    font-weight: 700;
    color: var(--accent-pink);
    text-transform: uppercase;
}

.matrix-outputs {
    display: flex;
    gap: 0.3rem;
}

.matrix-out-tag {
    font-size: 0.7rem;
    background: rgba(99, 102, 241, 0.15);
    color: var(--primary);
    padding: 0.1rem 0.4rem;
    border-radius: 4px;
    font-weight: 600;
    text-transform: uppercase;
}

/* Helpers */
.hidden {
    display: none !important;
}

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

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(6px); }
    to { opacity: 1; transform: translateY(0); }
}

@media (max-width: 900px) {
    .compare-inputs-grid {
        grid-template-columns: 1fr;
    }
    .editor-panes-grid {
        grid-template-columns: 1fr;
    }
    .secondary-grid {
        grid-template-columns: 1fr;
    }
    .converter-card {
        padding: 1.5rem;
    }
}

/* SEO Feature Section */
.seo-feature-section {
    background: var(--card-bg);
    backdrop-filter: blur(20px);
    border: 1px solid var(--card-border);
    border-radius: var(--radius-xl);
    padding: 3rem 2.5rem;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.25rem;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.35);
}

.section-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.82rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--accent-cyan);
    background: rgba(6, 182, 212, 0.12);
    border: 1px solid rgba(6, 182, 212, 0.25);
    padding: 0.35rem 0.9rem;
    border-radius: 20px;
}

.seo-section-title {
    font-size: 1.85rem;
    font-weight: 800;
    letter-spacing: -0.02em;
    color: var(--text-main);
    max-width: 750px;
}

.seo-section-sub {
    font-size: 0.98rem;
    color: var(--text-muted);
    max-width: 680px;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 1.5rem;
    width: 100%;
    margin-top: 1.5rem;
    text-align: left;
}

.feature-card {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--card-border);
    border-radius: var(--radius-md);
    padding: 1.75rem;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    transition: var(--transition-fast);
}

.feature-card:hover {
    border-color: var(--card-hover-border);
    background: rgba(255, 255, 255, 0.06);
    transform: translateY(-3px);
}

.feature-icon {
    width: 44px;
    height: 44px;
    border-radius: 12px;
    background: rgba(99, 102, 241, 0.15);
    color: var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
}

.feature-card h3 {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text-main);
}

.feature-card p {
    font-size: 0.88rem;
    color: var(--text-muted);
    line-height: 1.6;
}

/* SEO FAQ Accordion */
.seo-faq-section {
    background: var(--card-bg);
    backdrop-filter: blur(20px);
    border: 1px solid var(--card-border);
    border-radius: var(--radius-xl);
    padding: 3rem 2.5rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.25rem;
    text-align: center;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.35);
}

.faq-container {
    width: 100%;
    max-width: 850px;
    display: flex;
    flex-direction: column;
    gap: 0.85rem;
    margin-top: 1.5rem;
    text-align: left;
}

.faq-item {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--card-border);
    border-radius: var(--radius-md);
    overflow: hidden;
    transition: var(--transition-fast);
}

.faq-item[open] {
    border-color: var(--card-hover-border);
    background: rgba(255, 255, 255, 0.05);
}

.faq-question {
    padding: 1.25rem 1.5rem;
    font-size: 1rem;
    font-weight: 700;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: space-between;
    list-style: none;
    user-select: none;
    color: var(--text-main);
}

.faq-question::-webkit-details-marker {
    display: none;
}

.faq-chevron {
    font-size: 0.9rem;
    color: var(--text-dim);
    transition: transform 0.25s ease;
}

.faq-item[open] .faq-chevron {
    transform: rotate(180deg);
    color: var(--accent-cyan);
}

.faq-answer {
    padding: 0 1.5rem 1.25rem;
    color: var(--text-muted);
    font-size: 0.92rem;
    line-height: 1.65;
}

/* Footer Links */
.app-footer {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.75rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--card-border);
    color: var(--text-dim);
    font-size: 0.85rem;
    text-align: center;
}

.footer-links {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    justify-content: center;
}

.footer-links a {
    color: var(--text-muted);
    text-decoration: none;
    transition: var(--transition-fast);
}

.footer-links a:hover {
    color: var(--accent-cyan);
}