/* ---------- Base styles ---------- */

:root {
    --bg: #0f172a;
    --bg-soft: #111827;
    --card: #1e293b;
    --text: #e5e7eb;
    --muted: #94a3b8;
    --accent: #38bdf8;
    --accent-hover: #7dd3fc;
    --border: #334155;
    --max-width: 1100px;
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    padding-top: 2.75rem;
    font-family: Arial, Helvetica, sans-serif;
    background:
        linear-gradient(rgba(15, 23, 42, 0.82), rgba(15, 23, 42, 0.9)),
        url("matthewraydev.png");
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
    color: var(--text);
    line-height: 1.6;
}

/* ---------- Layout ---------- */

main,
footer {
    width: min(92%, var(--max-width));
    margin: 0 auto;
}

main {
    padding: 2rem 0 4rem;
}

section {
    max-width: var(--max-width);
    margin: 4rem auto;
}

h1,
h2,
h3 {
    line-height: 1.2;
    margin-top: 0;
}

h2 {
    font-size: 2rem;
    margin-bottom: 1.5rem;
    text-align: center;
}

h3 {
    font-size: 1.2rem;
}

p {
    color: var(--muted);
}

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

a:hover {
    color: var(--accent-hover);
    text-decoration: underline;
}

/* ---------- Top bar / liquid glass ---------- */

.top-bar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    width: 100%;
    margin: 0;
    padding: 0.7rem 1rem;
    overflow: hidden;
    isolation: isolate;

    background:
        linear-gradient(
            135deg,
            rgba(56, 189, 248, 0.12),
            rgba(15, 23, 42, 0.72) 35%,
            rgba(30, 41, 59, 0.55) 100%
        );

    -webkit-backdrop-filter: blur(18px) saturate(160%);
    backdrop-filter: blur(18px) saturate(160%);

    border-bottom: 1px solid rgba(148, 163, 184, 0.25);

    box-shadow:
        0 1px 0 rgba(255, 255, 255, 0.08) inset,
        0 10px 30px rgba(2, 6, 23, 0.35),
        0 0 24px rgba(56, 189, 248, 0.08);

    text-align: center;
}

.top-bar::before {
    content: "";
    position: absolute;
    inset: 0;
    z-index: -1;

    background:
        radial-gradient(
            circle at 20% 0%,
            rgba(255, 255, 255, 0.16),
            transparent 30%
        ),
        radial-gradient(
            circle at 80% 0%,
            rgba(56, 189, 248, 0.18),
            transparent 35%
        );

    opacity: 0.9;
}

.top-bar::after {
    content: "";
    position: absolute;
    left: 10%;
    right: 10%;
    bottom: 0;
    height: 1px;
    background: linear-gradient(
        to right,
        transparent,
        rgba(125, 211, 252, 0.8),
        transparent
    );
}

.top-bar p {
    margin: 0;
    color: var(--accent);
    font-size: 0.78rem;
    font-weight: bold;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    text-shadow: 0 0 14px rgba(56, 189, 248, 0.35);
}

/* ---------- Hero ---------- */

#hero {
    max-width: 850px;
    padding: 5rem 0 3rem;
    text-align: center;
}

#hero h1 {
    max-width: 850px;
    margin: 0 auto 1.25rem;
    font-size: clamp(2.25rem, 5vw, 3.6rem);
    line-height: 1.1;
}

#hero h2 {
    max-width: 800px;
    margin: 0 auto 1.25rem;
    font-size: clamp(1.8rem, 4vw, 3rem);
    line-height: 1.15;
    text-align: center;
}

#hero p {
    max-width: 700px;
    margin: 0 auto;
    color: var(--muted);
    font-size: 1.05rem;
    text-align: center;
}

/* ---------- Portfolio / project slider ---------- */

#portfolio {
    max-width: 1100px;
}

.project-slider {
    position: relative;
    max-width: 1100px;
    height: 420px;
    margin: 1.5rem auto 0;
    overflow: hidden;
}

.slider-stage {
    position: relative;
    height: 100%;
}

.project-card {
    position: absolute;
    top: 0;
    left: 50%;
    width: min(760px, 76%);
    height: 100%;

    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 14px;
    padding: 1.75rem;

    display: flex;
    flex-direction: column;

    will-change: transform, opacity;
    backface-visibility: hidden;
    transform-style: preserve-3d;

    transition:
        transform 0.45s ease,
        opacity 0.45s ease,
        border-color 0.2s ease;
}

.project-card h3 {
    margin-bottom: 0.75rem;
}

.project-card p {
    margin-bottom: 1rem;
}

.project-card a {
    margin-top: auto;
    align-self: flex-start;
}

.project-card.active {
    transform: translate3d(-50%, 0, 0) scale(1);
    opacity: 1;
    z-index: 3;
    pointer-events: auto;
}

.project-card.previous {
    transform: translate3d(-118%, 0, 0) scale(0.9);
    opacity: 0.28;
    z-index: 2;
    pointer-events: none;
}

.project-card.next {
    transform: translate3d(18%, 0, 0) scale(0.9);
    opacity: 0.28;
    z-index: 2;
    pointer-events: none;
}

.project-card.hidden {
    transform: translate3d(-50%, 0, 0) scale(0.75);
    opacity: 0;
    z-index: 1;
    pointer-events: none;
}

.project-card.active:hover {
    transform: translate3d(-50%, 0, 0) scale(1);
    border-color: var(--accent);
}

.project-slider::before,
.project-slider::after {
    content: "";
    position: absolute;
    top: 0;
    width: 15%;
    height: 100%;
    z-index: 4;
    pointer-events: none;
}

.project-slider::before {
    left: 0;
    background: linear-gradient(to right, var(--bg), transparent);
}

.project-slider::after {
    right: 0;
    background: linear-gradient(to left, var(--bg), transparent);
}

.slider-btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    z-index: 5;

    width: 42px;
    height: 42px;

    border: 1px solid var(--border);
    border-radius: 50%;

    background: rgba(30, 41, 59, 0.82);
    color: var(--accent);

    -webkit-backdrop-filter: blur(10px);
    backdrop-filter: blur(10px);

    font-size: 1.2rem;
    cursor: pointer;
}

.slider-btn:hover {
    border-color: var(--accent);
    background: var(--bg-soft);
}

.slider-btn-left {
    left: 0.5rem;
}

.slider-btn-right {
    right: 0.5rem;
}

/* ---------- Credentials ---------- */

#credentials {
    max-width: 900px;
    background: var(--bg-soft);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 2rem;
}

#credentials ul {
    padding-left: 1.25rem;
}

#credentials li {
    margin-bottom: 0.75rem;
}

.cert-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1rem;
    margin-top: 1rem;
}

.cert-card {
    display: flex;
    align-items: center;
    gap: 0.9rem;

    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 14px;
    padding: 1rem;

    color: var(--text);
}

.cert-card:hover {
    border-color: var(--accent);
    text-decoration: none;
}

.cert-card img {
    width: 56px;
    height: 56px;
    object-fit: contain;
    flex-shrink: 0;
}

.cert-card span {
    font-weight: bold;
}

/* ---------- Resume ---------- */

#resume {
    max-width: 900px;
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 2rem;
}

#resume p {
    text-align: center;
}

#resume a {
    display: block;
    width: fit-content;
    margin: 1rem auto 0;
    padding: 0.75rem 1rem;

    background: var(--accent);
    color: #020617;

    border-radius: 10px;
    font-weight: bold;
}

#resume a:hover {
    background: var(--accent-hover);
    text-decoration: none;
}

/* ---------- Contact ---------- */

#contact p {
    display: flex;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
}

#contact a {
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 0.6rem 0.9rem;
}

#contact a:hover {
    border-color: var(--accent);
    text-decoration: none;
}

/* ---------- Footer ---------- */

footer {
    padding: 2rem 0;
    border-top: 1px solid var(--border);
    text-align: center;
}

footer p {
    font-size: 0.9rem;
}

/* ---------- Mobile ---------- */

@media (max-width: 700px) {
    body {
        padding-top: 2.65rem;
    }

    main,
    footer {
        width: min(92%, var(--max-width));
    }

    section {
        margin: 3rem auto;
    }

    .top-bar {
        padding: 0.65rem 0.75rem;
    }

    .top-bar p {
        font-size: 0.68rem;
        letter-spacing: 0.08em;
    }

    #hero {
        padding: 3.5rem 0 2rem;
    }

    #hero h1 {
        font-size: clamp(2rem, 10vw, 3rem);
    }

    #hero h2 {
        font-size: clamp(1.7rem, 8vw, 2.5rem);
    }

    #credentials,
    #resume {
        padding: 1.5rem;
    }

    .project-slider {
        height: 320px;
    }

    .project-card {
        width: 82%;
        padding: 1.35rem;
    }

    .project-card.previous {
        transform: translate3d(-120%, 0, 0) scale(0.9);
    }

    .project-card.next {
        transform: translate3d(20%, 0, 0) scale(0.9);
    }

    .cert-grid {
        grid-template-columns: 1fr;
    }
}

/* ---------- Motion accessibility ---------- */

@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }

    .project-card {
        transition: none;
    }
}