:root {
    --bg: #050816;
    --bg-alt: #0b1020;
    --card-bg: #10172a;
    --accent: #38bdf8;
    --accent-soft: rgba(56, 189, 248, 0.15);
    --text: #e5e7eb;
    --muted: #9ca3af;
    --border: #1f2937;
    --radius-lg: 16px;
    --radius-md: 10px;
    --shadow-soft: 0 18px 40px rgba(15, 23, 42, 0.65);
    --shadow-card: 0 12px 30px rgba(15, 23, 42, 0.8);
    --transition-fast: 0.18s ease-out;
    --transition-med: 0.25s ease-out;
}

/* Global reset-ish */
*,
*::before,
*::after {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    background: radial-gradient(circle at top, #1f2937 0, #020617 42%, #000 100%);
    color: var(--text);
    line-height: 1.6;
    scroll-behavior: smooth;
}

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

a:hover {
    text-decoration: underline;
}

img {
    max-width: 100%;
    display: block;
}

/* Layout helpers */
.container {
    width: 100%;
    max-width: 1080px;
    margin: 0 auto;
    padding: 0 1.25rem;
}

/* Header / nav */
.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    backdrop-filter: blur(18px);
    background: linear-gradient(to bottom, rgba(15, 23, 42, 0.92), rgba(15, 23, 42, 0.7), rgba(15, 23, 42, 0));
    border-bottom: 1px solid rgba(148, 163, 184, 0.18);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.75rem 0.25rem;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.55rem;
}

.logo-mark {
    width: 32px;
    height: 32px;
    border-radius: 999px;
    background: radial-gradient(circle at 30% 20%, #38bdf8, #0ea5e9 30%, #0f172a);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    color: #e5e7eb;
    font-weight: 700;
    font-size: 0.9rem;
    box-shadow: 0 12px 30px rgba(56, 189, 248, 0.45);
}

.logo-text {
    font-weight: 600;
    letter-spacing: 0.03em;
    font-size: 0.98rem;
}

.nav {
    display: flex;
    align-items: center;
    gap: 1rem;
    font-size: 0.9rem;
}

.nav a {
    position: relative;
    padding: 0.2rem 0.1rem;
    color: var(--muted);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.nav a::after {
    content: "";
    position: absolute;
    left: 0;
    bottom: -0.15rem;
    width: 0;
    height: 2px;
    background: linear-gradient(to right, #38bdf8, #22c55e);
    border-radius: 999px;
    transition: width var(--transition-fast);
}

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

.nav a:hover::after {
    width: 100%;
}

.nav-toggle {
    display: none;
    background: none;
    border: 1px solid rgba(148, 163, 184, 0.35);
    color: var(--text);
    border-radius: 999px;
    padding: 0.25rem 0.6rem;
    font-size: 1.15rem;
    cursor: pointer;
    background-color: rgba(15, 23, 42, 0.8);
}

/* Hero */
.hero {
    padding: 4.5rem 0 3.5rem;
}

.hero-inner {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.hero-text h1 {
    font-size: clamp(2.2rem, 4vw, 2.8rem);
    margin: 0 0 0.75rem;
    line-height: 1.15;
}

.hero-text p {
    margin: 0.5rem 0 1.5rem;
    color: var(--muted);
    max-width: 36rem;
}

.hero-text strong {
    color: #e5e7eb;
}

.hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    margin-bottom: 0.75rem;
}

.hero-subtext {
    font-size: 0.9rem;
    color: var(--muted);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.6rem 1.1rem;
    border-radius: 999px;
    font-size: 0.9rem;
    font-weight: 500;
    border: 1px solid transparent;
    cursor: pointer;
    text-decoration: none;
    transition: transform var(--transition-fast), box-shadow var(--transition-fast), background-color var(--transition-fast), border-color var(--transition-fast), color var(--transition-fast);
}

.btn-primary {
    background: radial-gradient(circle at 20% 0, #38bdf8 0, #0ea5e9 40%, #0369a1 100%);
    color: #0b1120;
    box-shadow: 0 18px 40px rgba(56, 189, 248, 0.4);
}

.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 22px 45px rgba(56, 189, 248, 0.55);
}

.btn-outline {
    background: rgba(15, 23, 42, 0.7);
    border-color: rgba(148, 163, 184, 0.5);
    color: var(--text);
}

.btn-outline:hover {
    background: rgba(31, 41, 55, 0.9);
    border-color: rgba(148, 163, 184, 0.9);
}

/* Sections */
.section {
    padding: 3.5rem 0;
}

.section-alt {
    background: radial-gradient(circle at top, rgba(15, 118, 110, 0.12), rgba(15, 23, 42, 0.95));
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
}

.section-title {
    font-size: 1.6rem;
    margin-bottom: 0.5rem;
}

.section-intro {
    margin: 0 0 2rem;
    color: var(--muted);
    max-width: 36rem;
}

/* Grid & cards */
.grid {
    display: grid;
    gap: 1.5rem;
}

@media (min-width: 768px) {
    .grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

.card {
    background: radial-gradient(circle at top left, rgba(56, 189, 248, 0.08), var(--card-bg));
    border-radius: var(--radius-lg);
    padding: 1.3rem 1.3rem 1.25rem;
    border: 1px solid rgba(148, 163, 184, 0.25);
    box-shadow: var(--shadow-card);
    transition: transform var(--transition-med), box-shadow var(--transition-med), border-color var(--transition-med), background var(--transition-med);
}

.card:hover {
    transform: translateY(-3px);
    box-shadow: 0 20px 42px rgba(15, 23, 42, 0.95);
    border-color: rgba(56, 189, 248, 0.55);
    background: radial-gradient(circle at top left, rgba(56, 189, 248, 0.14), var(--card-bg));
}

.card h3 {
    margin-top: 0;
    margin-bottom: 0.4rem;
    font-size: 1.05rem;
}

.card p {
    margin: 0.3rem 0 0.7rem;
    color: var(--muted);
}

.card ul {
    margin: 0;
    padding-left: 1.1rem;
    font-size: 0.9rem;
}

.card li {
    margin-bottom: 0.2rem;
}

.card-compact {
    padding: 1.1rem 1.2rem;
}

.tagline {
    font-size: 0.85rem;
    color: var(--muted);
}

/* About section */
.about-grid {
    display: grid;
    gap: 2rem;
}

@media (min-width: 768px) {
    .about-grid {
        grid-template-columns: minmax(0, 2fr) minmax(0, 1.4fr);
        align-items: start;
    }
}

.about-details {
    background: rgba(15, 23, 42, 0.9);
    border-radius: var(--radius-lg);
    border: 1px solid rgba(148, 163, 184, 0.35);
    padding: 1.2rem 1.25rem;
    box-shadow: var(--shadow-soft);
}

.about-details h3 {
    margin-top: 0;
    margin-bottom: 0.45rem;
    font-size: 1rem;
}

.about-details ul {
    margin: 0;
    padding-left: 1.2rem;
    font-size: 0.9rem;
}

/* Contact section */
.contact-layout {
    display: grid;
    gap: 2rem;
}

@media (min-width: 768px) {
    .contact-layout {
        grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr);
        align-items: start;
    }
}

.contact-form {
    background: rgba(15, 23, 42, 0.9);
    border-radius: var(--radius-lg);
    padding: 1.5rem 1.5rem 1.25rem;
    border: 1px solid rgba(148, 163, 184, 0.4);
    box-shadow: var(--shadow-soft);
}

.field {
    margin-bottom: 0.95rem;
}

.field label {
    display: block;
    margin-bottom: 0.3rem;
    font-size: 0.88rem;
    color: var(--muted);
}

.field input,
.field textarea {
    width: 100%;
    padding: 0.55rem 0.7rem;
    border-radius: var(--radius-md);
    border: 1px solid rgba(55, 65, 81, 0.9);
    background: rgba(15, 23, 42, 0.95);
    color: var(--text);
    font: inherit;
    outline: none;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast), background-color var(--transition-fast);
}

.field input:focus,
.field textarea:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 1px rgba(56, 189, 248, 0.6);
    background-color: #020617;
}

.contact-note {
    margin-top: 0.8rem;
    font-size: 0.85rem;
    color: var(--muted);
}

.contact-side h3 {
    margin-top: 0;
    margin-bottom: 0.35rem;
    font-size: 1rem;
}

.contact-side p {
    margin-top: 0;
    margin-bottom: 0.8rem;
    color: var(--muted);
}

.contact-side ul {
    margin: 0;
    padding-left: 1.2rem;
    font-size: 0.9rem;
}

/* Footer */
.site-footer {
    border-top: 1px solid rgba(31, 41, 55, 0.9);
    background: radial-gradient(circle at bottom, #020617, #020617 60%, #000);
    padding: 1rem 0;
    margin-top: 1.5rem;
}

.footer-inner {
    display: flex;
    flex-direction: column;
    gap: 0.3rem;
    align-items: center;
    font-size: 0.85rem;
    color: var(--muted);
}

.footer-inner a {
    color: var(--accent);
}

/* Responsive tweaks */
@media (max-width: 720px) {
    .nav {
        position: absolute;
        top: 55px;
        right: 1.2rem;
        flex-direction: column;
        background: rgba(15, 23, 42, 0.98);
        padding: 0.8rem 1rem;
        border-radius: 14px;
        border: 1px solid rgba(148, 163, 184, 0.4);
        box-shadow: 0 16px 40px rgba(15, 23, 42, 0.9);
        transform: translateY(-12px);
        opacity: 0;
        pointer-events: none;
        transition: opacity var(--transition-fast), transform var(--transition-fast);
    }

    .nav.nav-open {
        opacity: 1;
        pointer-events: auto;
        transform: translateY(0);
    }

    .nav-toggle {
        display: inline-flex;
    }

    .hero {
        padding-top: 3.2rem;
    }

    .hero-actions {
        flex-direction: column;
        align-items: flex-start;
    }
}