/* Base / reset */

*,
*::before,
*::after {
    box-sizing: border-box;
}

html,
body {
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
}

/* Theme */

:root {
    --color-bg: #020712;
    --color-bg-elevated: #07111f;
    --color-bg-alt: #050b17;
    --color-border-subtle: #0f2640;
    --color-border-strong: #1b3b63;
    --color-text: #f5f7ff;
    --color-text-muted: #a3b5d4;
    --color-text-soft: #7e8fb0;
    --color-accent: #00e0ff;
    --color-accent-soft: rgba(0, 224, 255, 0.16);
    --color-accent-strong: #00b6e0;

    --shadow-soft: 0 18px 45px rgba(0, 0, 0, 0.5);
    --radius-lg: 18px;
    --radius-xl: 24px;
    --radius-pill: 999px;

    --font-sans: system-ui, -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", sans-serif;

    --container-max: 1120px;
    --header-height: 72px;
}

body {
    font-family: var(--font-sans);
    background: radial-gradient(circle at top left, #071325 0, var(--color-bg) 52%);
    color: var(--color-text);
    line-height: 1.6;
}

body.nav-open {
    overflow: hidden;
}

/* Layout */

.container {
    width: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 1.5rem;
}

.section {
    padding: 4rem 0;
}

.section-alt {
    background: linear-gradient(135deg, rgba(3, 15, 30, 0.95), rgba(4, 25, 47, 0.95));
    backdrop-filter: blur(22px);
}

.section-header {
    max-width: 720px;
    margin: 0 auto 2.5rem;
    text-align: center;
}

.section-header h2 {
    font-size: clamp(1.7rem, 1.5vw + 1.2rem, 2.1rem);
    margin-bottom: 0.6rem;
}

.section-header p {
    color: var(--color-text-muted);
    margin: 0;
    font-size: 0.98rem;
}

.grid {
    display: grid;
    gap: 1.75rem;
}

.grid-4 {
    grid-template-columns: repeat(4, minmax(0, 1fr));
}

.grid-3 {
    grid-template-columns: repeat(3, minmax(0, 1fr));
}

/* Global link styling */

a {
    text-decoration: none;
    color: var(--color-text);
    font-weight: 600;
}

a:visited {
    color: var(--color-text);
}

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

/* Header / nav */

.site-header {
    position: sticky;
    top: 0;
    z-index: 10000;
    backdrop-filter: blur(18px);
    background: linear-gradient(
        to bottom,
        rgba(1, 4, 12, 0.96),
        rgba(1, 4, 12, 0.85),
        rgba(1, 4, 12, 0.78)
    );
    border-bottom: 1px solid rgba(50, 90, 140, 0.45);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: var(--header-height);
    gap: 0.75rem;
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 0.8rem;
    text-decoration: none;
    color: inherit;
    font-weight: 400;
}

.brand-logo {
    height: 38px;
    width: auto;
    border-radius: 12px;
    box-shadow: 0 0 22px rgba(0, 224, 255, 0.35);
}

.brand-text {
    display: flex;
    flex-direction: column;
}

.brand-title {
    font-weight: 650;
    letter-spacing: 0.09em;
    text-transform: uppercase;
    font-size: 0.78rem;
}

.brand-subtitle {
    font-size: 0.7rem;
    color: var(--color-text-soft);
    font-weight: 400;
}

/* nav overrides */

.primary-nav {
    display: flex;
}

.primary-nav ul {
    display: flex;
    align-items: center;
    list-style: none;
    margin: 0;
    padding: 0;
    gap: 1.4rem;
    font-size: 0.9rem;
}

.primary-nav a,
.primary-nav a:visited {
    text-decoration: none;
    color: var(--color-text-soft);
    position: relative;
    padding: 0.2rem 0;
    font-weight: 400;
}

.primary-nav a::after {
    content: "";
    position: absolute;
    left: 0;
    bottom: -0.16rem;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--color-accent), var(--color-accent-strong));
    transition: width 0.2s ease-out;
}

.primary-nav a:hover,
.primary-nav a:focus-visible {
    color: var(--color-text);
}

.primary-nav a:hover::after,
.primary-nav a:focus-visible::after {
    width: 100%;
}

/* nav backdrop (mobile) */

.nav-backdrop {
    display: none;
}

/* Hamburger */

.nav-toggle {
    display: none;
    width: 40px;
    height: 32px;
    border-radius: 9px;
    border: 1px solid rgba(126, 143, 176, 0.6);
    background: rgba(3, 12, 28, 0.9);
    padding: 0 9px;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 4px;
    cursor: pointer;
}

.nav-toggle span {
    width: 100%;
    height: 2px;
    background: #f8fbff;
    border-radius: 999px;
    transition: transform 0.2s ease, opacity 0.2s ease, background-color 0.2s ease;
}

.nav-toggle.is-open {
    background: rgba(0, 224, 255, 0.16);
    border-color: var(--color-accent);
}

.nav-toggle.is-open span:nth-child(1) {
    transform: translateY(4px) rotate(45deg);
}
.nav-toggle.is-open span:nth-child(2) {
    opacity: 0;
}
.nav-toggle.is-open span:nth-child(3) {
    transform: translateY(-4px) rotate(-45deg);
}

/* Hero */

.hero {
    padding: 4.2rem 0 3.6rem;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: "";
    position: absolute;
    inset: -40%;
    background:
        radial-gradient(circle at 12% 10%, rgba(0, 224, 255, 0.24), transparent 55%),
        radial-gradient(circle at 80% 0, rgba(0, 109, 255, 0.22), transparent 55%),
        radial-gradient(circle at 50% 120%, rgba(0, 0, 0, 0.9), rgba(0, 0, 0, 0.95));
    opacity: 0.95;
    pointer-events: none;
    z-index: -2;
}

.hero-inner {
    display: grid;
    gap: 3rem;
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr);
    align-items: flex-start;
}

.hero-copy h1 {
    font-size: clamp(2.2rem, 3vw + 1rem, 3rem);
    letter-spacing: -0.03em;
    margin: 0 0 1rem;
}

.hero-lead,
.hero-lead-secondary {
    color: var(--color-text-muted);
    margin: 0;
    max-width: 34rem;
    font-size: 0.98rem;
    font-weight: 400;
}

.hero-lead-secondary {
    margin-top: 0.7rem;
}

.hero-actions {
    display: flex;
    gap: 0.9rem;
    flex-wrap: wrap;
    margin-top: 1.8rem;
    margin-bottom: 1.2rem;
}

/* Hero meta: rectangular cards */

.hero-meta {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 0.75rem;
    margin: 1.4rem 0 0;
    padding: 0;
    list-style: none;
    max-width: 44rem;
}

.hero-meta-item {
    padding: 0.65rem 0.9rem;
    border-radius: 12px;
    border: 1px solid rgba(15, 38, 64, 0.9);
    background: radial-gradient(circle at top left,
                rgba(0, 224, 255, 0.12),
                rgba(3, 11, 22, 0.98));
}

.hero-meta dt {
    margin: 0 0 0.15rem;
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.14em;
    color: var(--color-text-soft);
    font-weight: 600;
}

.hero-meta dd {
    margin: 0;
    font-size: 0.8rem;
    color: var(--color-text-muted);
    font-weight: 400;
}

/* Hero right */

.hero-panel {
    display: flex;
    flex-direction: column;
    gap: 1.3rem;
}

.hero-card {
    padding: 1.5rem 1.6rem 1.3rem;
    border-radius: var(--radius-xl);
    background: radial-gradient(circle at top left, rgba(0, 224, 255, 0.18), rgba(2, 11, 24, 0.98));
    border: 1px solid rgba(0, 224, 255, 0.4);
    box-shadow: var(--shadow-soft);
    font-size: 0.9rem;
}

.card-emphasis {
    position: relative;
}

.card-emphasis::before {
    content: "";
    position: absolute;
    inset: -1px;
    border-radius: inherit;
    background: radial-gradient(circle at top left, rgba(0, 224, 255, 0.22), transparent 65%);
    mix-blend-mode: screen;
    opacity: 0.9;
    pointer-events: none;
}

.hero-card h2 {
    margin-top: 0;
    margin-bottom: 0.45rem;
    font-size: 1.08rem;
}

.hero-card p {
    margin: 0 0 0.7rem;
    color: var(--color-text-muted);
    font-weight: 400;
}

.hero-card-link {
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    font-size: 0.86rem;
    color: var(--color-accent);
    font-weight: 500;
}

.hero-card-link:hover,
.hero-card-link:focus-visible {
    text-decoration: underline;
}

.hero-card-tags {
    margin-top: 0.9rem;
    display: flex;
    flex-wrap: wrap;
    gap: 0.45rem;
}

.tag {
    font-size: 0.75rem;
    padding: 0.22rem 0.6rem;
    border-radius: var(--radius-pill);
    border: 1px solid var(--color-border-subtle);
    background: rgba(4, 20, 40, 0.9);
    color: var(--color-text-soft);
    font-weight: 400;
}

/* Cards & buttons */

.card {
    background: var(--color-bg-elevated);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border-subtle);
    padding: 1.4rem 1.5rem;
    box-shadow: 0 18px 45px rgba(0, 0, 0, 0.35);
    font-size: 0.93rem;
}

.card-feature {
    position: relative;
    overflow: hidden;
}

.card-feature::before {
    content: "";
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at top left, var(--color-accent-soft), transparent 60%);
    opacity: 0.8;
    pointer-events: none;
}

.card-feature > * {
    position: relative;
}

.card-header h3 {
    margin-top: 0;
    margin-bottom: 0.25rem;
    font-size: 1.04rem;
}

.card-kicker {
    margin: 0 0 0.8rem;
    font-size: 0.8rem;
    color: var(--color-text-soft);
    text-transform: uppercase;
    letter-spacing: 0.16em;
    font-weight: 600;
}

.card p {
    margin-top: 0;
    color: var(--color-text-muted);
    font-weight: 400;
}

.card-list {
    margin: 0.75rem 0 0.75rem 1rem;
    padding-left: 0.35rem;
    color: var(--color-text-muted);
}

.card-list li + li {
    margin-top: 0.25rem;
}

.card-footnote {
    font-size: 0.8rem;
    color: var(--color-text-soft);
    margin-top: 0.8rem;
}

/* Buttons */

.btn,
.btn:visited {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.6rem 1.1rem;
    border-radius: var(--radius-pill);
    border: 1px solid transparent;
    font-size: 0.9rem;
    text-decoration: none;
    cursor: pointer;
    max-width: 100%;
    white-space: normal;
    text-align: center;
    transition: transform 0.1s ease-out, box-shadow 0.1s ease-out, background 0.1s ease-out, border-color 0.1s ease-out;
    font-weight: 500;
}

.btn-primary,
.btn-primary:visited {
    background: linear-gradient(135deg, var(--color-accent), var(--color-accent-strong));
    color: #02040b;
    box-shadow: 0 14px 30px rgba(0, 224, 255, 0.38);
}

.btn-primary:hover,
.btn-primary:focus-visible {
    transform: translateY(-1px);
    box-shadow: 0 16px 35px rgba(0, 224, 255, 0.48);
    color: #02040b;
}

.btn-ghost,
.btn-ghost:visited {
    border-color: var(--color-border-subtle);
    background: rgba(4, 16, 32, 0.9);
    color: var(--color-text-soft);
    font-weight: 500;
}

.btn-ghost:hover,
.btn-ghost:focus-visible {
    border-color: var(--color-accent);
    color: var(--color-text);
}

.btn-subtle,
.btn-subtle:visited {
    border-color: var(--color-border-subtle);
    background: rgba(4, 18, 36, 0.9);
    color: var(--color-accent);
    font-size: 0.85rem;
    font-weight: 500;
}

.btn-subtle:hover,
.btn-subtle:focus-visible {
    border-color: var(--color-accent);
    background: rgba(3, 23, 43, 0.98);
    color: var(--color-accent);
}

.section-cta {
    margin-top: 2.5rem;
    text-align: center;
}

/* Contact & footer */

.contact-inner {
    max-width: 880px;
}

.contact-simple {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1.6rem;
}

.contact-block h3 {
    margin-top: 0;
    margin-bottom: 0.4rem;
    font-size: 0.95rem;
}

.contact-block p {
    margin-top: 0;
    margin-bottom: 0.5rem;
    color: var(--color-text-muted);
    font-weight: 400;
}

.site-footer {
    padding: 1.4rem 0 1.8rem;
    border-top: 1px solid var(--color-border-subtle);
    background: rgba(1, 4, 12, 0.98);
}

.footer-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    font-size: 0.8rem;
    color: var(--color-text-soft);
}

.footer-links {
    display: flex;
    align-items: center;
    gap: 0.65rem;
}

/* footer links override baseline white */

.footer-links a,
.footer-links a:visited {
    color: var(--color-text-soft);
    font-weight: 400;
}

.footer-links a:hover,
.footer-links a:focus-visible {
    color: var(--color-accent);
}

/* Responsive */

@media (max-width: 1024px) {
    .grid-4 {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
    .hero-inner {
        grid-template-columns: minmax(0, 1fr);
    }
    .hero-panel {
        order: -1;
    }
    .hero-meta {
        max-width: 100%;
    }
    .contact-simple {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (max-width: 768px) {
    .grid-4,
    .grid-3 {
        grid-template-columns: minmax(0, 1fr);
    }

    .section {
        padding: 3.25rem 0;
    }

    .hero {
        padding-top: 4rem;
    }

    .hero-meta {
        grid-template-columns: minmax(0, 1fr);
    }

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

    .hero-actions .btn {
        width: 100%;
    }

    /* Mobile nav overlay and backdrop */
    .nav-toggle {
        display: inline-flex;
    }

    .primary-nav {
        position: fixed;
        top: var(--header-height);
        left: 0;
        right: 0;
        height: calc(100vh - var(--header-height));
        background: rgba(2, 7, 18, 0.98);
        transform: translateY(-100%);
        opacity: 0;
        pointer-events: none;
        transition: transform 0.2s ease-out, opacity 0.2s ease-out;
        z-index: 10001;
    }

    .primary-nav ul {
        flex-direction: column;
        align-items: flex-start;
        padding: 1.25rem 1.5rem 2rem;
        gap: 0.9rem;
    }

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

    .nav-backdrop {
        display: block;
        position: fixed;
        inset: 0;
        background: #020712;
        opacity: 0;
        pointer-events: none;
        transition: opacity 0.2s ease-out;
        z-index: 10000;
    }

    body.nav-open .nav-backdrop {
        opacity: 1;
        pointer-events: auto;
    }

    .footer-inner {
        flex-direction: column;
        align-items: flex-start;
    }

    .contact-simple {
        grid-template-columns: minmax(0, 1fr);
    }
}

/* Focus */

:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
}

/* === HARD OVERRIDE: contact + content links === */

.section a,
.section a:visited,
.contact-block a,
.contact-block a:visited {
    color: #ffffff !important;
    font-weight: 600 !important;
    text-decoration: none !important;
}

/* Hover / focus state */
.section a:hover,
.section a:focus-visible,
.contact-block a:hover,
.contact-block a:focus-visible {
    color: var(--color-accent) !important;
    text-decoration: none !important;
}

/* === HARD OVERRIDE: hero meta cards (Focus / Stack / AI Engineering / Ethics) === */

.hero-meta {
    display: flex !important;
    flex-wrap: wrap !important;
    gap: 0.75rem !important;
    margin: 1.4rem 0 0 !important;
    padding: 0 !important;
    list-style: none !important;
    max-width: 44rem !important;
}

.hero-meta-item {
    flex: 1 1 180px !important;
    min-width: 0 !important;
    padding: 0.65rem 0.9rem !important;
    border-radius: 12px !important;   /* kills the circle */
    border: 1px solid rgba(15, 38, 64, 0.9) !important;
    background: radial-gradient(circle at top left,
                rgba(0, 224, 255, 0.12),
                rgba(3, 11, 22, 0.98)) !important;
    height: auto !important;
    width: auto !important;
}

.hero-meta dt {
    margin: 0 0 0.15rem !important;
    font-size: 0.7rem !important;
    text-transform: uppercase !important;
    letter-spacing: 0.14em !important;
    color: var(--color-text-soft) !important;
    font-weight: 600 !important;
}

.hero-meta dd {
    margin: 0 !important;
    font-size: 0.8rem !important;
    color: var(--color-text-muted) !important;
    font-weight: 400 !important;
}

@media (max-width: 768px) {
    .hero-meta {
        flex-direction: column !important;
        max-width: 100% !important;
    }
}

/* === Mobile menu: tie visibility to body.nav-open and fix layering === */
@media (max-width: 768px) {
    /* Base (closed) state */
    .primary-nav {
        position: fixed;
        top: var(--header-height);
        left: 0;
        right: 0;
        height: calc(100vh - var(--header-height));
        background: rgba(2, 7, 18, 0.98);
        transform: translateY(-100%);
        opacity: 0;
        pointer-events: none;
        transition: transform 0.2s ease-out, opacity 0.2s ease-out;
        z-index: 10002; /* above header + backdrop */
    }

    .primary-nav ul {
        flex-direction: column;
        align-items: flex-start;
        padding: 1.25rem 1.5rem 2rem;
        gap: 0.9rem;
    }

    /* Open state controlled only by body.nav-open */
    body.nav-open .primary-nav {
        transform: translateY(0);
        opacity: 1;
        pointer-events: auto;
    }

    /* Backdrop under header+nav */
    .nav-backdrop {
        display: block;
        position: fixed;
        inset: 0;
        background: rgba(2, 7, 18, 0.85); /* slightly see-through */
        opacity: 0;
        pointer-events: none;
        transition: opacity 0.2s ease-out;
        z-index: 10000;
    }

    body.nav-open .nav-backdrop {
        opacity: 1;
        pointer-events: auto;
    }

    /* Make sure header sits above backdrop, below nav */
    .site-header {
        z-index: 10001;
    }
}

/* === Hero meta cards: tighten for mobile so they don't feel huge === */
@media (max-width: 768px) {
    .hero-meta {
        display: flex;
        flex-direction: column;
        gap: 0.6rem;
        max-width: 100%;
        margin-top: 1.2rem;
    }

    .hero-meta-item {
        padding: 0.5rem 0.75rem;
        border-radius: 10px;
    }

    .hero-meta dt {
        font-size: 0.65rem;
        letter-spacing: 0.13em;
    }

    .hero-meta dd {
        font-size: 0.78rem;
    }
}