:root {
    --primary-bg: #f8fafc;
    --nav-bg: #1e293b;
    --card-bg: #ffffff;
    --accent-color: #6366f1;
    --accent-hover: #4f46e5;
    --text-main: #1e293b;
    --text-muted: #64748b;
    --border-color: #e2e8f0;
    --shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --diff-add-bg: #ecfdf5;
    --diff-add-text: #065f46;
    --diff-rem-bg: #fef2f2;
    --diff-rem-text: #991b1b;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background-color: var(--primary-bg);
    color: var(--text-main);
    margin: 0;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Navigation */
.top-nav {
    background-color: var(--nav-bg);
    color: white;
    padding: 0.75rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow);
}

.nav-brand {
    font-size: 1.25rem;
    font-weight: 800;
    letter-spacing: -0.025em;
    background: linear-gradient(to right, #818cf8, #c084fc);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.nav-links {
    display: flex;
    gap: 1.5rem;
    overflow-x: auto;
}

.nav-link {
    color: #cbd5e1;
    text-decoration: none;
    font-weight: 500;
    font-size: 0.9rem;
    transition: color 0.2s;
    padding: 0.5rem 0;
    white-space: nowrap;
}

.nav-link:hover, .nav-link.active {
    color: white;
}

.nav-link.active {
    border-bottom: 2px solid var(--accent-color);
}

/* Layout */
.container {
    max-width: 1400px;
    width: 95%;
    margin: 2rem auto;
    flex-grow: 1;
}

.view {
    display: none;
    animation: fadeIn 0.3s ease-in-out;
}

.view.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.view-header {
    margin-bottom: 2rem;
}

.view-header h1 {
    font-size: 1.875rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: var(--text-main);
}

.view-header p {
    color: var(--text-muted);
    font-size: 1rem;
    max-width: 800px;
}

.tool-description {
    margin-top: 1rem;
    font-size: 0.95rem;
    color: var(--text-muted);
    border-left: 4px solid var(--accent-color);
    padding-left: 1rem;
    background: white;
    padding: 1rem;
    border-radius: 0 8px 8px 0;
    box-shadow: var(--shadow);
}

/* Content Card (About/Privacy) */
.content-card {
    background: white;
    padding: 2.5rem;
    border-radius: 12px;
    box-shadow: var(--shadow);
    border: 1px solid var(--border-color);
    line-height: 1.7;
}

/* Input Section */
.input-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.5rem;
    height: 32px;
}

.input-header label {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-muted);
}

.input-section {
    background: var(--card-bg);
    padding: 1.25rem;
    border-radius: 12px;
    box-shadow: var(--shadow);
    margin-bottom: 2.5rem;
    border: 1px solid var(--border-color);
}

#main-input {
    width: 100%;
    height: 150px;
    padding: 1rem;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
    font-family: 'JetBrains Mono', monospace;
    resize: vertical;
    box-sizing: border-box;
    background-color: #f9fafb;
}

#main-input:focus {
    outline: none;
    border-color: var(--accent-color);
}

.stats-bar {
    display: flex;
    gap: 1.5rem;
    padding-top: 1rem;
    margin-top: 1rem;
    border-top: 1px solid var(--border-color);
    font-size: 0.8rem;
    color: var(--text-muted);
}

.stats-bar b {
    color: var(--accent-color);
}

/* Output Grid */
.output-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(380px, 1fr));
    gap: 1.5rem;
}

.output-group {
    background: var(--card-bg);
    padding: 1.5rem;
    border-radius: 12px;
    box-shadow: var(--shadow);
    border: 1px solid var(--border-color);
}

.output-group h3 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-muted);
    margin-top: 0;
    margin-bottom: 1.25rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.field {
    margin-bottom: 1.25rem;
}

.field label {
    display: block;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-muted);
    margin-bottom: 0.4rem;
}

.input-with-button {
    display: flex;
    gap: 0.5rem;
}

.input-with-button input, .multi-output input {
    flex: 1;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background-color: #f1f5f9;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.85rem;
    color: var(--text-main);
}

.multi-output {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

/* Buttons */
.copy-btn {
    padding: 0.5rem 1rem;
    background-color: var(--accent-color);
    color: white;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 0.75rem;
    font-weight: 600;
    transition: all 0.2s;
    white-space: nowrap;
}

.copy-btn:hover {
    background-color: var(--accent-hover);
    transform: translateY(-1px);
}

.copy-btn.copied {
    background-color: #10b981;
}

.btn-small {
    padding: 0.25rem 0.6rem;
    font-size: 0.7rem;
    border-radius: 4px;
}

.primary-btn, .secondary-btn, .danger-btn {
    padding: 0.75rem;
    border: none;
    border-radius: 8px;
    font-weight: 600;
    font-size: 0.85rem;
    cursor: pointer;
    transition: all 0.2s;
}

.primary-btn { background: var(--accent-color); color: white; }
.primary-btn:hover { background: var(--accent-hover); }

.secondary-btn { background: #e2e8f0; color: var(--text-main); }
.secondary-btn:hover { background: #cbd5e1; }

.danger-btn { background: #fee2e2; color: #b91c1c; }
.danger-btn:hover { background: #fecaca; }

/* Parser Container (JSON/HTML) */
.parser-container {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: 1.5rem;
    height: 70vh;
    min-height: 750px;
    align-items: stretch;
}

.parser-input-side, .parser-output-side {
    display: flex;
    flex-direction: column;
    height: 100%;
}

.parser-input-side textarea, .parser-output-side textarea {
    flex: 1;
    padding: 1.25rem;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.9rem;
    line-height: 1.6;
    box-shadow: var(--shadow);
    resize: none;
    background-color: white;
}

.parser-input-side textarea:focus {
    outline: none;
    border-color: var(--accent-color);
}

.json-status {
    font-size: 0.75rem;
    font-weight: 600;
    padding: 0.25rem 0.75rem;
    border-radius: 4px;
    max-width: 200px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.json-status.valid { color: #059669; background: #ecfdf5; }
.json-status.invalid { color: #dc2626; background: #fef2f2; }

.parser-controls {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    justify-content: center;
    padding: 0 0.5rem;
}

.parser-controls button {
    width: 140px;
}

/* Diff Checker Specifics */
.diff-input-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.diff-input-side {
    display: flex;
    flex-direction: column;
}

.diff-input-side textarea {
    height: 300px;
    padding: 1rem;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.9rem;
    box-shadow: var(--shadow);
    resize: vertical;
}

.diff-result-section {
    background: white;
    padding: 1.5rem;
    border-radius: 12px;
    box-shadow: var(--shadow);
    border: 1px solid var(--border-color);
}

.diff-output-display {
    min-height: 200px;
    padding: 1rem;
    background: #f8fafc;
    border-radius: 8px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.9rem;
    line-height: 1.6;
    white-space: pre-wrap;
    overflow-x: auto;
}

.diff-added { background-color: var(--diff-add-bg); color: var(--diff-add-text); display: block; }
.diff-removed { background-color: var(--diff-rem-bg); color: var(--diff-rem-text); display: block; text-decoration: line-through; }
.placeholder-text { color: var(--text-muted); font-style: italic; }

/* Contact Layout Redesign */
.contact-layout {
    display: grid;
    grid-template-columns: 1fr 400px;
    gap: 2rem;
    align-items: start;
}

.contact-side {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.side-header h3 {
    margin: 0;
    font-size: 1.25rem;
    color: var(--text-main);
}

.side-header p {
    margin: 0.25rem 0 0;
    font-size: 0.9rem;
    color: var(--text-muted);
}

.comments-card, .form-card {
    background: white;
    padding: 2rem;
    border-radius: 12px;
    box-shadow: var(--shadow);
    border: 1px solid var(--border-color);
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

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

.form-group label {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-main);
}

.form-group input, .form-group textarea {
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-family: inherit;
    font-size: 0.95rem;
    background-color: #f9fafb;
}

.form-group textarea {
    height: 200px;
    resize: vertical;
}

/* Footer */
.site-footer {
    padding: 4rem 2rem 2.5rem;
    color: var(--text-muted);
    font-size: 0.875rem;
    border-top: 1px solid var(--border-color);
    background: white;
    margin-top: 5rem;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2rem;
}

.footer-brand {
    font-size: 1.25rem;
    font-weight: 800;
    background: linear-gradient(to right, #818cf8, #c084fc);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.footer-links {
    display: flex;
    gap: 2rem;
}

.footer-link {
    color: var(--text-muted);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s;
}

.footer-link:hover {
    color: var(--accent-color);
}

.copyright {
    margin-top: 1rem;
    opacity: 0.7;
}

@media (max-width: 1100px) {
    .contact-layout {
        grid-template-columns: 1fr;
    }
    .form-side {
        order: -1; /* Form on top for mobile */
    }
}

@media (max-width: 1000px) {
    .parser-container {
        grid-template-columns: 1fr;
        height: auto;
    }
    .parser-controls {
        flex-direction: row;
        flex-wrap: wrap;
    }
    .parser-controls button {
        flex: 1 1 150px;
    }
    .diff-input-container {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 600px) {
    .footer-links {
        flex-direction: column;
        align-items: center;
        gap: 1rem;
    }
    .top-nav {
        padding: 0.75rem 1rem;
    }
}