:root, [data-theme="dark"] {
    --bg-base: #0f172a;
    --bg-surface: rgba(30, 41, 59, 0.6);
    --bg-surface-hover: rgba(30, 41, 59, 0.8);
    --bg-dropdown: #1e293b;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --border-subtle: rgba(255, 255, 255, 0.1);
    --border-faint: rgba(255, 255, 255, 0.05);
    --nav-bg: rgba(15, 23, 42, 0.85);
    --footer-bg: rgba(15, 23, 42, 0.5);
    --modal-bg: rgba(15, 23, 42, 0.8);
    --input-bg: rgba(15, 23, 42, 0.6);
    --btn-secondary-bg: rgba(255, 255, 255, 0.1);
    --btn-secondary-hover: rgba(255, 255, 255, 0.15);
    --code-bg: rgba(15, 23, 42, 0.8);
    --code-inline-bg: rgba(255, 255, 255, 0.08);
    --accent-color: #00E4EA;
    --accent-gradient: linear-gradient(135deg, #00E4EA 0%, #3555EA 100%);
    --accent-glow: rgba(0, 228, 234, 0.4);
    --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
    --font-display: 'Outfit', system-ui, -apple-system, sans-serif;
    --font-mono: ui-monospace, 'Cascadia Mono', 'Courier New', monospace;
}

[data-theme="light"] {
    --bg-base: #f8fafc;
    --bg-surface: rgba(255, 255, 255, 0.9);
    --bg-surface-hover: #ffffff;
    --bg-dropdown: #ffffff;
    --text-primary: #0f172a;
    --text-secondary: #64748b;
    --border-subtle: rgba(15, 23, 42, 0.12);
    --border-faint: rgba(15, 23, 42, 0.06);
    --nav-bg: rgba(248, 250, 252, 0.9);
    --footer-bg: rgba(241, 245, 249, 0.85);
    --modal-bg: rgba(15, 23, 42, 0.5);
    --input-bg: #ffffff;
    --btn-secondary-bg: rgba(15, 23, 42, 0.06);
    --btn-secondary-hover: rgba(15, 23, 42, 0.12);
    --code-bg: #f1f5f9;
    --code-inline-bg: rgba(15, 23, 42, 0.07);
    --accent-color: #0284c7;
    --accent-gradient: linear-gradient(135deg, #0284c7 0%, #2563eb 100%);
    --accent-glow: rgba(2, 132, 199, 0.3);
}

[data-theme="nord"] {
    --bg-base: #242933;
    --bg-surface: rgba(46, 52, 64, 0.75);
    --bg-surface-hover: rgba(59, 66, 82, 0.9);
    --bg-dropdown: #2e3440;
    --text-primary: #eceff4;
    --text-secondary: #d8dee9;
    --border-subtle: rgba(236, 239, 244, 0.12);
    --border-faint: rgba(236, 239, 244, 0.05);
    --nav-bg: rgba(36, 41, 51, 0.88);
    --footer-bg: rgba(36, 41, 51, 0.65);
    --modal-bg: rgba(36, 41, 51, 0.85);
    --input-bg: rgba(46, 52, 64, 0.85);
    --btn-secondary-bg: rgba(236, 239, 244, 0.1);
    --btn-secondary-hover: rgba(236, 239, 244, 0.18);
    --code-bg: #2e3440;
    --code-inline-bg: rgba(236, 239, 244, 0.08);
    --accent-color: #88c0d0;
    --accent-gradient: linear-gradient(135deg, #88c0d0 0%, #5e81ac 100%);
    --accent-glow: rgba(136, 192, 208, 0.35);
}

[data-theme="steel"] {
    --bg-base: #0d0e12;
    --bg-surface: rgba(18, 20, 26, 0.8);
    --bg-surface-hover: rgba(27, 30, 38, 0.92);
    --bg-dropdown: #12141a;
    --text-primary: #e7e9ee;
    --text-secondary: #8b90a0;
    --border-subtle: #23262d;
    --border-faint: rgba(255, 255, 255, 0.04);
    --nav-bg: rgba(13, 14, 18, 0.88);
    --footer-bg: rgba(13, 14, 18, 0.7);
    --modal-bg: rgba(13, 14, 18, 0.85);
    --input-bg: #171a21;
    --btn-secondary-bg: #1b1e26;
    --btn-secondary-hover: #2a2e37;
    --code-bg: #171a21;
    --code-inline-bg: rgba(91, 156, 248, 0.12);
    --accent-color: #5b9cf8;
    --accent-gradient: linear-gradient(135deg, #4a8bf0 0%, #2f6fd8 100%);
    --accent-glow: rgba(91, 156, 248, 0.35);
    --font-sans: 'IBM Plex Sans', system-ui, -apple-system, 'Segoe UI', sans-serif;
    --font-display: 'IBM Plex Sans', system-ui, -apple-system, 'Segoe UI', sans-serif;
    --font-mono: 'IBM Plex Mono', ui-monospace, 'Cascadia Mono', monospace;
}

[data-theme="kage"] {
    --bg-base: #121212;
    --bg-surface: rgba(27, 27, 28, 0.85);
    --bg-surface-hover: rgba(36, 36, 37, 0.95);
    --bg-dropdown: #1b1b1c;
    --text-primary: #f2efec;
    --text-secondary: #8b8681;
    --border-subtle: #2b2a29;
    --border-faint: rgba(242, 239, 236, 0.05);
    --nav-bg: rgba(18, 18, 18, 0.9);
    --footer-bg: rgba(18, 18, 18, 0.75);
    --modal-bg: rgba(18, 18, 18, 0.85);
    --input-bg: #1b1b1c;
    --btn-secondary-bg: #1b1b1c;
    --btn-secondary-hover: #242425;
    --code-bg: #141819;
    --code-inline-bg: rgba(245, 144, 51, 0.12);
    --accent-color: #F59033;
    --accent-gradient: linear-gradient(135deg, #F59033 0%, #BD4E00 100%);
    --accent-glow: rgba(245, 144, 51, 0.35);
    --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
    --font-display: 'Outfit', system-ui, -apple-system, sans-serif;
    --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
}

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

body {
    background-color: var(--bg-base);
    color: var(--text-primary);
    font-family: var(--font-sans);
    line-height: 1.6;
    overflow-x: hidden;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    transition: background-color 0.25s ease, color 0.25s ease;
}

.gradient-text {
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-title {
    font-family: var(--font-display);
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: 3rem;
    font-weight: 700;
}

.glass-card {
    background: var(--bg-surface);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--border-subtle);
    border-radius: 16px;
    padding: 2rem;
    transition: transform 0.3s ease, background 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
}

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem 5%;
    position: sticky;
    top: 0;
    z-index: 100;
    background: var(--nav-bg);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-faint);
    transition: background 0.25s ease, border-color 0.25s ease;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 1.5rem;
    color: var(--text-primary);
}

.logo-icon {
    width: 24px;
    height: 24px;
    border-radius: 6px;
    background: var(--accent-gradient);
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 600;
    transition: color 0.2s ease;
}

.nav-links a:hover {
    color: var(--text-primary);
}

.nav-actions {
    display: flex;
    gap: 1rem;
    align-items: center;
}

/* Theme Selector */
.theme-selector {
    background: var(--btn-secondary-bg);
    color: var(--text-primary);
    border: 1px solid var(--border-subtle);
    border-radius: 8px;
    padding: 0.55rem 0.85rem;
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    outline: none;
    transition: all 0.2s ease;
    font-family: var(--font-sans);
}

.theme-selector:hover {
    background: var(--btn-secondary-hover);
    border-color: var(--accent-color);
}

.theme-selector:focus {
    border-color: var(--accent-color);
    box-shadow: 0 0 8px var(--accent-glow);
}

.theme-selector option {
    background: var(--bg-dropdown);
    color: var(--text-primary);
}

.btn-primary {
    background: var(--accent-gradient);
    color: white;
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    border: none;
    cursor: pointer;
    display: inline-block;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 15px var(--accent-glow);
}

.btn-secondary {
    background: var(--btn-secondary-bg);
    color: var(--text-primary);
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    transition: background 0.2s ease, border-color 0.2s ease;
    border: 1px solid var(--border-subtle);
    display: inline-block;
}

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

.btn-large {
    padding: 1rem 2rem;
    font-size: 1.1rem;
}

.hero {
    min-height: 80vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 4rem 5%;
    position: relative;
    gap: 4rem;
}

.hero-bg-gradient {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 600px;
    height: 600px;
    background: var(--accent-gradient);
    filter: blur(150px);
    opacity: 0.15;
    z-index: -1;
    border-radius: 50%;
}

.hero-content {
    flex: 1;
    max-width: 600px;
}

.hero-title {
    font-family: var(--font-display);
    font-size: 4rem;
    line-height: 1.1;
    margin-bottom: 1.5rem;
    font-weight: 800;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 2.5rem;
    max-width: 500px;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
}

.hero-graphic {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    perspective: 1000px;
}

.server-card {
    width: 350px;
    height: 250px;
    transform: rotateX(15deg) rotateY(-15deg);
    position: relative;
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 1rem;
}

.server-card:hover {
    transform: rotateX(5deg) rotateY(-5deg) scale(1.05);
}

.status-indicator {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    position: absolute;
    top: 1.5rem;
    right: 1.5rem;
    transition: background-color 0.4s ease, box-shadow 0.4s ease;
}

.status-indicator.online {
    background-color: #22c55e;
    box-shadow: 0 0 10px #22c55e;
}

.status-indicator.mismatch {
    background-color: #ef4444;
    box-shadow: 0 0 10px #ef4444;
}

.code-line {
    height: 12px;
    background: var(--border-subtle);
    border-radius: 6px;
    width: 80%;
}

.code-line.short {
    width: 40%;
}

.dns-records {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
}

.dns-line {
    font-family: var(--font-mono, monospace);
    font-size: 0.78rem;
    color: var(--text-secondary);
    opacity: 0.5;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    transition: color 0.4s ease, opacity 0.4s ease;
}

.dns-line.active {
    color: var(--accent-color);
    opacity: 1;
    font-weight: 600;
}

.ip-address {
    margin-top: 1rem;
    font-family: var(--font-mono, monospace);
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.ip-address span {
    color: var(--text-primary);
    font-weight: bold;
    transition: color 0.4s ease;
}

.ip-address span.mismatch {
    color: #ef4444;
}

.features {
    padding: 6rem 5%;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.feature-card {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.feature-card:hover {
    transform: translateY(-5px);
    background: var(--bg-surface-hover);
    border-color: var(--accent-glow);
}

.feature-icon {
    font-size: 2rem;
    margin-bottom: 1.5rem;
    background: var(--btn-secondary-bg);
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 12px;
}

.feature-card h3 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
    font-family: var(--font-display);
}

.feature-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

footer {
    margin-top: auto;
    border-top: 1px solid var(--border-faint);
    background: var(--footer-bg);
    padding: 4rem 5% 2rem;
    transition: background 0.25s ease, border-color 0.25s ease;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    max-width: 1200px;
    margin: 0 auto 3rem;
    flex-wrap: wrap;
    gap: 2rem;
}

.footer-brand p {
    color: var(--text-secondary);
    margin-top: 1rem;
    max-width: 250px;
}

.footer-links {
    display: flex;
    gap: 4rem;
}

.link-column {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.link-column h4 {
    margin-bottom: 0.5rem;
}

.link-column a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.2s ease;
}

.link-column a:hover {
    color: var(--text-primary);
}

.footer-bottom {
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.875rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border-faint);
}

@media (max-width: 768px) {
    .hero { flex-direction: column; text-align: center; padding-top: 2rem; }
    .hero-title { font-size: 2.5rem; }
    .hero-subtitle { margin: 0 auto 2rem; }
    .hero-buttons { justify-content: center; flex-direction: column; }
    .nav-links { display: none; }
    .server-card { transform: none; }
    .server-card:hover { transform: scale(1.02); }
    .footer-content { flex-direction: column; }
}

.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: var(--modal-bg);
    backdrop-filter: blur(5px);
    align-items: center;
    justify-content: center;
}

.modal-content {
    width: 100%;
    max-width: 400px;
    position: relative;
    background: var(--bg-dropdown);
    border: 1px solid var(--border-subtle);
}

.close-btn {
    position: absolute;
    top: 1rem;
    right: 1.5rem;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-secondary);
    transition: color 0.2s;
}

.close-btn:hover {
    color: var(--text-primary);
}

.form-group {
    margin-bottom: 1.25rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.form-group input, .form-group select {
    width: 100%;
    padding: 0.75rem 1rem;
    border-radius: 8px;
    background: var(--input-bg);
    border: 1px solid var(--border-subtle);
    color: var(--text-primary);
    font-family: var(--font-sans);
    outline: none;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.form-group input:focus, .form-group select:focus {
    border-color: var(--accent-color);
    box-shadow: 0 0 10px var(--accent-glow);
}

.error-message {
    color: #ef4444;
    font-size: 0.85rem;
    margin-bottom: 1rem;
    min-height: 1rem;
}