:root {
    --bg-color: #0f172a;
    --card-bg: rgba(30, 41, 59, 0.7);
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --accent-color: #06b6d4;
    /* Cyan */
    --accent-hover: #0891b2;
    --success-color: #22c55e;
    --error-color: #ef4444;
    --border-color: rgba(148, 163, 184, 0.1);
    --glass-border: 1px solid rgba(255, 255, 255, 0.1);
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3), 0 2px 4px -1px rgba(0, 0, 0, 0.15);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 2rem;
    overflow-x: hidden;
}

/* Background Glob for ambient lighting */
.background-glob {
    position: fixed;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle at center, rgba(6, 182, 212, 0.15) 0%, rgba(15, 23, 42, 0) 50%);
    z-index: -1;
    pointer-events: none;
}

.container {
    width: 100%;
    max-width: 900px;
}

header {
    text-align: center;
    margin-bottom: 2rem;
}

header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    letter-spacing: -0.05em;
    margin-bottom: 0.5rem;
}

.accent-text {
    color: var(--accent-color);
    text-shadow: 0 0 20px rgba(6, 182, 212, 0.5);
}

header p {
    color: var(--text-secondary);
}

/* Tabs */
.tabs {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.tab-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    padding: 0.75rem 1.5rem;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 500;
    border-radius: 9999px;
    transition: var(--transition);
}

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

.tab-btn.active {
    background: var(--accent-color);
    color: white;
    box-shadow: 0 0 15px rgba(6, 182, 212, 0.4);
}

/* Sub Tabs */
.sub-tab-btn {
    background: rgba(0, 0, 0, 0.2);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 0.5rem 1rem;
    cursor: pointer;
    font-size: 0.9rem;
    border-radius: 0.5rem;
    transition: var(--transition);
}

.sub-tab-btn:hover {
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.1);
}

.sub-tab-btn.active {
    background: var(--accent-hover);
    color: white;
    border-color: transparent;
}

.sub-content {
    display: none;
}

.sub-content.active {
    display: block;
    animation: fadeIn 0.3s ease;
}


/* Main Content Area */
.tab-content {
    display: none;
    animation: fadeIn 0.4s ease-out;
}

.tab-content.active {
    display: block;
}

/* Fullscreen Integrity Demo */
#integrity.active {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: 9999;
    padding: 0;
    background: var(--bg-color);
    display: flex;
    flex-direction: column;
}

#integrity.active .card {
    border-radius: 0;
    border: none;
    box-shadow: none;
}

#integrity.active .iframe-container {
    flex: 1;
}

.back-btn {
    display: none;
}

#integrity.active .back-btn {
    display: inline-block;
    background: rgba(255, 255, 255, 0.1);
    color: white;
    border: 1px solid rgba(255, 255, 255, 0.2);
    padding: 0.5rem 1rem;
    border-radius: 0.5rem;
    cursor: pointer;
    font-size: 0.9rem;
    margin-left: auto;
    transition: var(--transition);
}

#integrity.active .back-btn:hover {
    background: rgba(255, 255, 255, 0.2);
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.card {
    background: var(--card-bg);
    backdrop-filter: blur(12px);
    border: var(--glass-border);
    border-radius: 1.5rem;
    padding: 2rem;
    box-shadow: var(--shadow);
}

h2 {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 1rem;
}

/* Drop Zone */
.drop-zone {
    border: 2px dashed var(--border-color);
    border-radius: 1rem;
    padding: 3rem;
    text-align: center;
    transition: var(--transition);
    cursor: pointer;
    margin-bottom: 1.5rem;
    background: rgba(0, 0, 0, 0.2);
}

.drop-zone.dragover {
    border-color: var(--accent-color);
    background: rgba(6, 182, 212, 0.1);
}

.drop-zone .icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    opacity: 0.8;
}

.drop-zone p {
    color: var(--text-secondary);
}

.drop-zone .highlight {
    color: var(--accent-color);
    font-weight: 600;
    text-decoration: underline;
}

.file-name {
    margin-top: 1rem;
    font-weight: 600;
    color: var(--text-primary) !important;
    word-break: break-all;
}

.compare-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
    margin-bottom: 1.5rem;
}

.drop-zone.small {
    padding: 2rem 1rem;
}

/* Controls */
.controls {
    display: flex;
    gap: 1rem;
    align-items: center;
    flex-wrap: wrap;
    margin-bottom: 1.5rem;
}

.controls.centered {
    justify-content: center;
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    flex: 1;
}

.form-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

label {
    font-size: 0.875rem;
    color: var(--text-secondary);
    font-weight: 500;
}

select,
input[type="text"] {
    background: rgba(15, 23, 42, 0.8);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 0.75rem;
    border-radius: 0.5rem;
    font-family: inherit;
    font-size: 1rem;
    width: 100%;
}

select:focus,
input[type="text"]:focus {
    outline: 2px solid var(--accent-color);
    border-color: transparent;
}

.action-btn {
    background: var(--accent-color);
    color: white;
    border: none;
    padding: 0.75rem 2rem;
    border-radius: 0.5rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    min-width: 120px;
}

.action-btn.full-width {
    width: 100%;
}

.action-btn:hover {
    background: var(--accent-hover);
    box-shadow: 0 0 15px rgba(6, 182, 212, 0.4);
    transform: translateY(-1px);
}

/* Output Area */
.output-group {
    background: rgba(0, 0, 0, 0.3);
    padding: 1rem;
    border-radius: 0.75rem;
    position: relative;
    border: 1px solid var(--border-color);
}

.output-box {
    font-family: 'Courier New', monospace;
    word-break: break-all;
    color: var(--text-primary);
    line-height: 1.5;
    margin-top: 0.5rem;
    min-height: 24px;
}

.output-box.large {
    min-height: 200px;
    white-space: pre-wrap;
    font-size: 0.9rem;
}

.copy-btn {
    position: absolute;
    top: 0.5rem;
    right: 0.5rem;
    background: rgba(255, 255, 255, 0.1);
    border: none;
    color: var(--text-secondary);
    padding: 0.25rem 0.75rem;
    border-radius: 0.25rem;
    cursor: pointer;
    font-size: 0.75rem;
    transition: var(--transition);
}

.copy-btn:hover {
    background: rgba(255, 255, 255, 0.2);
    color: white;
}

/* Result Display (Compare) */
.result-display {
    text-align: center;
    padding: 2rem;
    background: rgba(0, 0, 0, 0.3);
    border-radius: 1rem;
    animation: fadeIn 0.3s ease;
}

.status-icon {
    font-size: 3rem;
    margin-bottom: 0.5rem;
}

.status-text {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    text-shadow: 0 0 10px rgba(0, 0, 0, 0.5);
}

.hash-comparison-table {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    text-align: left;
    margin-bottom: 1.5rem;
    background: rgba(0, 0, 0, 0.2);
    padding: 1rem;
    border-radius: 0.5rem;
}

.hash-col h4 {
    color: var(--text-secondary);
    font-size: 0.8rem;
    text-transform: uppercase;
    margin-bottom: 0.5rem;
}

.hash-val {
    font-family: 'Courier New', monospace;
    font-size: 0.85rem;
    word-break: break-all;
    background: rgba(0, 0, 0, 0.3);
    padding: 0.5rem;
    border-radius: 0.25rem;
}

.legal-text {
    text-align: left;
    background: rgba(255, 255, 255, 0.05);
    padding: 1rem;
    border-radius: 0.5rem;
    border-left: 4px solid var(--text-secondary);
}

.legal-text ul {
    margin-left: 1.5rem;
    margin-top: 0.5rem;
}

.legal-text li {
    margin-bottom: 0.3rem;
    color: var(--text-secondary);
}

.info-note {
    background: rgba(6, 182, 212, 0.1);
    border-left: 4px solid var(--accent-color);
    padding: 1rem;
    border-radius: 0.5rem;
    margin-bottom: 2rem;
    font-size: 0.9rem;
    line-height: 1.6;
    color: var(--text-secondary);
}

.info-note strong {
    color: var(--text-primary);
}

.match {
    border: 1px solid var(--success-color);
    background: rgba(34, 197, 94, 0.05);
}

.match .status-icon,
.match .status-text {
    color: var(--success-color);
}

.match .legal-text {
    border-left-color: var(--success-color);
}

.mismatch {
    border: 1px solid var(--error-color);
    background: rgba(239, 68, 68, 0.05);
}

.mismatch .status-icon,
.mismatch .status-text {
    color: var(--error-color);
}

.mismatch .legal-text {
    border-left-color: var(--error-color);
}

/* Responsive */
@media (max-width: 600px) {

    .compare-grid,
    .form-grid {
        grid-template-columns: 1fr;
    }

    .hash-comparison-table {
        grid-template-columns: 1fr;
    }

    .tabs {
        flex-direction: column;
    }

    .tab-btn {
        width: 100%;
        text-align: center;
    }

    .controls {
        flex-direction: column;
        align-items: stretch;
    }

    .action-btn {
        width: 100%;
    }
}