:root {
    color-scheme: dark;
    --bg-main: #0a192f;
    --bg-card: #112240;
    --bg-card-hover: #172a45;
    --text-title: #e6f1ff;
    --text-body: #a8b2d1;
    --text-muted: #71809f;
    --accent-blue: #38bdf8;
    --accent-cyan: #00d9f5;
    --font-sans: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    --font-mono: "Cascadia Code", Consolas, monospace;
}

* {
    box-sizing: border-box;
}

html {
    min-width: 320px;
    background: var(--bg-main);
}

body {
    min-height: 100vh;
    margin: 0;
    color: var(--text-body);
    background:
        radial-gradient(ellipse at 75% 0, rgba(56, 189, 248, 0.1), transparent 38rem),
        var(--bg-main);
    font-family: var(--font-sans);
    line-height: 1.6;
}

a {
    color: inherit;
    text-decoration: none;
}

a:focus-visible,
button:focus-visible {
    outline: 2px solid var(--accent-cyan);
    outline-offset: 4px;
}

.gallery {
    width: min(1120px, calc(100% - 48px));
    margin: 0 auto;
    padding: 48px 0 32px;
}

.gallery-header {
    margin-bottom: 36px;
}

.back-link {
    display: inline-block;
    margin-bottom: 54px;
    color: var(--accent-blue);
    font-family: var(--font-mono);
    font-size: 0.85rem;
}

.back-link:hover {
    color: var(--accent-cyan);
}

.eyebrow {
    margin: 0 0 8px;
    color: var(--accent-cyan);
    font-family: var(--font-mono);
    font-size: 0.75rem;
    letter-spacing: 0.12em;
}

h1 {
    margin: 0;
    color: var(--text-title);
    font-size: clamp(2.2rem, 6vw, 3.8rem);
    letter-spacing: -0.045em;
    line-height: 1.1;
}

.intro {
    margin: 14px 0 0;
}

.certificate-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
}

.certificate-card {
    position: relative;
    display: grid;
    min-height: 220px;
    aspect-ratio: 1.48;
    place-items: center;
    overflow: hidden;
    padding: 12px;
    background: var(--bg-card);
    border: 1px solid rgba(56, 189, 248, 0.14);
    border-radius: 10px;
    box-shadow: 0 12px 30px rgba(2, 12, 27, 0.16);
    transition: transform 180ms ease, border-color 180ms ease, background 180ms ease;
}

.certificate-card:hover {
    z-index: 1;
    transform: translateY(-4px);
    background: var(--bg-card-hover);
    border-color: var(--accent-blue);
}

.certificate-card img {
    display: block;
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.certificate-number {
    position: absolute;
    right: 10px;
    bottom: 10px;
    padding: 3px 8px;
    color: var(--accent-cyan);
    background: rgba(10, 25, 47, 0.9);
    border: 1px solid rgba(56, 189, 248, 0.25);
    border-radius: 4px;
    font-family: var(--font-mono);
    font-size: 0.7rem;
}

.gallery-footer {
    margin-top: 44px;
    color: var(--text-muted);
    font-family: var(--font-mono);
    font-size: 0.75rem;
}

.certificate-dialog {
    position: relative;
    width: min(94vw, 1200px);
    max-width: none;
    max-height: 92vh;
    margin: auto;
    padding: 48px 16px 16px;
    overflow: auto;
    background: var(--bg-card);
    border: 1px solid rgba(56, 189, 248, 0.35);
    border-radius: 10px;
}

.certificate-dialog::backdrop {
    background: rgba(2, 12, 27, 0.9);
    backdrop-filter: blur(4px);
}

.dialog-image {
    display: block;
    width: 100%;
    max-height: calc(92vh - 80px);
    object-fit: contain;
}

.dialog-close {
    position: absolute;
    top: 8px;
    right: 10px;
    width: 36px;
    height: 36px;
    color: var(--text-title);
    background: var(--bg-main);
    border: 1px solid var(--text-muted);
    border-radius: 50%;
    cursor: pointer;
    font-size: 1.5rem;
    line-height: 1;
}

.dialog-close:hover {
    color: var(--accent-cyan);
    border-color: var(--accent-cyan);
}

@media (max-width: 760px) {
    .gallery {
        width: min(100% - 32px, 600px);
        padding-top: 28px;
    }

    .back-link {
        margin-bottom: 42px;
    }

    .certificate-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
        gap: 14px;
    }

    .certificate-card {
        min-height: 150px;
        padding: 8px;
    }
}

@media (max-width: 420px) {
    .certificate-grid {
        grid-template-columns: 1fr;
    }

    .certificate-card {
        min-height: 200px;
    }
}

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        scroll-behavior: auto !important;
        transition-duration: 0.01ms !important;
    }
}