:root {
    --background: #0f172a;
    --background-alt: #111827;
    --card: rgba(15, 23, 42, 0.85);
    --accent: #38bdf8;
    --accent-strong: #0ea5e9;
    --text: #e2e8f0;
    --text-muted: #a1b5d8;
    --surface: rgba(30, 41, 59, 0.85);
    --border: rgba(148, 163, 184, 0.2);
    --shadow: 0 20px 45px rgba(15, 23, 42, 0.55);
    --radius: 18px;
    --transition: 200ms ease;
    font-family: "Inter", "SF Pro Display", -apple-system, BlinkMacSystemFont, sans-serif;
}

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

html, body {
    background: var(--background);
    color: var(--text);
    font-family: inherit;
    scroll-behavior: smooth;
}

body {
    line-height: 1.6;
}

a {
    color: inherit;
    text-decoration: none;
    transition: color var(--transition);
}

a:hover,
a:focus {
    color: var(--accent);
}

.container {
    width: min(1100px, 90vw);
    margin: 0 auto;
}

.top-bar {
    backdrop-filter: blur(12px);
    background: linear-gradient(135deg, rgba(15, 23, 42, 0.85), rgba(30, 41, 59, 0.7));
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 20;
}

.top-bar .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1.1rem 0;
}

.brand {
    font-weight: 700;
    letter-spacing: 0.06em;
    text-transform: uppercase;
}

.nav {
    display: flex;
    gap: 1.5rem;
}

.nav a {
    font-size: 0.95rem;
    text-transform: uppercase;
    letter-spacing: 0.07em;
    position: relative;
}

.nav a::after {
    content: "";
    position: absolute;
    left: 0;
    bottom: -0.35rem;
    width: 100%;
    height: 2px;
    background: var(--accent);
    border-radius: 999px;
    transform: scaleX(0);
    transform-origin: right;
    transition: transform var(--transition);
}

.nav a:hover::after,
.nav a.active::after {
    transform: scaleX(1);
    transform-origin: left;
}

.nav-toggle {
    display: none;
    background: transparent;
    border: none;
    flex-direction: column;
    gap: 0.3rem;
    cursor: pointer;
}

.nav-toggle span {
    width: 24px;
    height: 2px;
    background: var(--text);
    border-radius: 999px;
    transition: transform var(--transition), opacity var(--transition);
}

.hero {
    padding: 6rem 0;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: "";
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at top right, rgba(14, 165, 233, 0.25), transparent 55%);
    z-index: 0;
}

.hero-top {
    background: linear-gradient(160deg, rgba(15, 23, 42, 0.95), rgba(30, 41, 59, 0.8));
}

.hero-mid {
    background: linear-gradient(180deg, rgba(30, 41, 59, 0.9), rgba(15, 23, 42, 0.95));
}

.hero-content {
    position: relative;
    z-index: 1;
}

.hero h1 {
    font-size: clamp(2.5rem, 5vw, 3.8rem);
    margin-bottom: 1.2rem;
}

.hero h2 {
    font-size: clamp(1.8rem, 4vw, 2.8rem);
    margin-bottom: 0.8rem;
}

.hero p {
    color: var(--text-muted);
    max-width: 600px;
}

.cta-group {
    margin-top: 2rem;
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.8rem;
    border-radius: 999px;
    font-weight: 600;
    letter-spacing: 0.04em;
    border: 1px solid transparent;
    transition: background var(--transition), color var(--transition), transform var(--transition), box-shadow var(--transition);
}

.btn.primary {
    background: var(--accent);
    color: #04121f;
    box-shadow: 0 12px 30px rgba(14, 165, 233, 0.35);
}

.btn.primary:hover {
    background: var(--accent-strong);
    transform: translateY(-2px);
}

.btn.secondary {
    background: transparent;
    border-color: rgba(148, 163, 184, 0.5);
    color: var(--text);
}

.btn.secondary:hover {
    border-color: var(--accent);
    transform: translateY(-2px);
}

.features {
    padding: 5rem 0;
    background: var(--background-alt);
}

.features h2 {
    text-align: center;
    font-size: 2rem;
    margin-bottom: 2.5rem;
}

.feature-grid {
    display: grid;
    gap: 1.8rem;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

.feature-grid article {
    background: var(--surface);
    border-radius: var(--radius);
    padding: 2rem;
    border: 1px solid var(--border);
    box-shadow: var(--shadow);
    transition: transform var(--transition), border-color var(--transition);
}

.feature-grid article:hover {
    transform: translateY(-6px);
    border-color: rgba(56, 189, 248, 0.5);
}

.feature-grid h3 {
    margin-bottom: 0.7rem;
}

.stats {
    padding: 4rem 0;
    background: linear-gradient(130deg, rgba(14, 165, 233, 0.12), rgba(14, 165, 233, 0));
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 2rem;
    text-align: center;
}

.stats strong {
    display: block;
    font-size: 2rem;
}

.contact {
    padding: 5rem 0;
    background: var(--background-alt);
}

.contact h2 {
    text-align: center;
    font-size: 2rem;
    margin-bottom: 1rem;
}

.contact-intro {
    text-align: center;
    color: var(--text-muted);
    max-width: 700px;
    margin: 0 auto 0.5rem;
}

.contact-intro a {
    color: var(--accent);
    text-decoration: underline;
}

.contact-form {
    max-width: 700px;
    margin: 3rem auto 0;
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
    background: var(--surface);
    border-radius: var(--radius);
    padding: 2.5rem;
    border: 1px solid var(--border);
    box-shadow: var(--shadow);
}

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

.form-group.full-width {
    grid-column: 1 / -1;
}

.form-group label {
    font-weight: 600;
    font-size: 0.95rem;
    color: var(--text);
}

.form-group .required {
    color: var(--accent);
}

.contact-form input,
.contact-form textarea {
    padding: 0.9rem 1.1rem;
    border-radius: 12px;
    border: 1px solid var(--border);
    background: rgba(15, 23, 42, 0.6);
    color: var(--text);
    font-size: 1rem;
    font-family: inherit;
    transition: border-color var(--transition), background var(--transition);
}

.contact-form input:focus,
.contact-form textarea:focus {
    outline: none;
    border-color: var(--accent);
    background: rgba(15, 23, 42, 0.8);
}

.contact-form textarea {
    resize: vertical;
    min-height: 120px;
}

.contact-form button[type="submit"] {
    grid-column: 1 / -1;
    justify-self: center;
    margin-top: 1rem;
}

.form-status {
    grid-column: 1 / -1;
    text-align: center;
    padding: 0.8rem;
    border-radius: 12px;
    font-weight: 500;
    display: none;
}

.form-status.success {
    display: block;
    background: rgba(34, 197, 94, 0.15);
    border: 1px solid rgba(34, 197, 94, 0.4);
    color: #4ade80;
}

.form-status.error {
    display: block;
    background: rgba(239, 68, 68, 0.15);
    border: 1px solid rgba(239, 68, 68, 0.4);
    color: #f87171;
}

.contact-card {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 2rem;
    background: var(--surface);
    border-radius: var(--radius);
    padding: 2.5rem;
    border: 1px solid var(--border);
    box-shadow: var(--shadow);
}

.contact-card .inline-link {
    color: var(--accent);
    text-decoration: underline;
    font-weight: 600;
}

.contact-card .inline-link:hover {
    color: var(--accent-strong);
}

.contact input,
.contact textarea {
    padding: 0.9rem 1.1rem;
    border-radius: 12px;
    border: 1px solid var(--border);
    background: rgba(15, 23, 42, 0.6);
    color: var(--text);
    width: min(320px, 100%);
    font-size: 1rem;
}

.contact form {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.footer {
    padding: 3rem 0;
    border-top: 1px solid var(--border);
    background: rgba(10, 15, 25, 0.9);
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    align-items: center;
}

.footer-links {
    display: flex;
    gap: 1.4rem;
    flex-wrap: wrap;
}

.footer-meta {
    color: var(--text-muted);
    font-size: 0.9rem;
}

.support-hero {
    padding: 5rem 0 3rem;
    background: linear-gradient(160deg, rgba(14, 165, 233, 0.15), transparent 70%);
}

.support-section {
    padding: 3.5rem 0;
}

.steps {
    list-style-position: inside;
    display: grid;
    gap: 1rem;
    background: var(--surface);
    padding: 2rem;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    box-shadow: var(--shadow);
}

.steps li strong {
    color: var(--accent);
}

.faq-grid,
.troubleshooting-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 1.5rem;
}

.faq-grid article,
.troubleshooting-grid article {
    background: var(--surface);
    border-radius: var(--radius);
    padding: 2rem;
    border: 1px solid var(--border);
    box-shadow: var(--shadow);
}

.troubleshooting-grid ul {
    list-style: disc inside;
    color: var(--text-muted);
    margin-top: 1rem;
    display: grid;
    gap: 0.6rem;
}

.contact-card textarea {
    width: min(460px, 100%);
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    border: 0;
}

@media (max-width: 768px) {
    .nav {
        position: absolute;
        top: 100%;
        right: 1.5rem;
        background: rgba(15, 23, 42, 0.95);
        border-radius: 14px;
        border: 1px solid var(--border);
        box-shadow: var(--shadow);
        flex-direction: column;
        padding: 1.2rem;
        gap: 1rem;
        transform: translateY(-10px);
        opacity: 0;
        pointer-events: none;
        transition: opacity var(--transition), transform var(--transition);
    }

    .nav[data-open="true"] {
        opacity: 1;
        transform: translateY(0);
        pointer-events: auto;
    }

    .nav-toggle {
        display: flex;
    }

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

    .contact-form {
        grid-template-columns: 1fr;
        padding: 1.8rem;
    }
}

@media (max-width: 600px) {
    .hero {
        padding: 4.5rem 0;
    }

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

    .stats strong {
        font-size: 1.6rem;
    }

    .contact-card form {
        flex-direction: column;
        align-items: stretch;
    }
}