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

:root,
[data-theme="light"] {
    --bg: #f5f5f0;
    --fg: #0a0a0a;
    --fg-muted: #555;
    --accent: #c8ff00;
    --accent-fg: #0a0a0a;
    --surface: #e8e8e3;
    --border-w: 3px;
    --border: var(--border-w) solid var(--fg);
    --border-thick: 6px solid var(--fg);
}

[data-theme="dark"] {
    --bg: #0a0a0a;
    --fg: #f5f5f0;
    --fg-muted: #999;
    --accent: #00ff41;
    --accent-fg: #0a0a0a;
    --surface: #1a1a1a;
    --border: var(--border-w) solid var(--fg);
    --border-thick: 6px solid var(--fg);
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: 'Space Grotesk', 'Helvetica Neue', sans-serif;
    background: var(--bg);
    color: var(--fg);
    line-height: 1.1;
    overflow-x: hidden;
    transition: background 0.3s, color 0.3s;
}

.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem 2rem;
    border-bottom: var(--border-thick);
    position: sticky;
    top: 0;
    background: var(--bg);
    z-index: 100;
}

.header__left {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.header__logo {
    font-family: 'Bebas Neue', 'Impact', sans-serif;
    font-size: 2.5rem;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    line-height: 1;
}

.header__nav {
    display: flex;
    gap: 2rem;
}

.header__link {
    font-family: 'JetBrains Mono', 'Courier New', monospace;
    font-size: 0.75rem;
    font-weight: 700;
    text-decoration: none;
    color: var(--fg);
    letter-spacing: 0.12em;
    padding: 0.3rem 0;
    border-bottom: 2px solid transparent;
    transition: border-color 0.15s;
}

.header__link:hover {
    border-bottom-color: var(--accent);
}

.theme-toggle {
    background: none;
    border: var(--border);
    padding: 0.5rem 0.8rem;
    cursor: pointer;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    color: var(--fg);
    transition: background 0.15s, color 0.15s;
}

.theme-toggle:hover {
    background: var(--accent);
    color: var(--accent-fg);
}

.hero {
    padding: 6rem 2rem 4rem;
    border-bottom: var(--border-thick);
}

.hero__title {
    font-size: clamp(3.5rem, 13vw, 12rem);
    font-weight: 900;
    line-height: 0.85;
    letter-spacing: -0.03em;
    text-transform: uppercase;
    font-family: 'Bebas Neue', 'Impact', sans-serif;
}

.hero__title-line {
    display: block;
}

.hero__title-line--serif {
    font-family: 'Playfair Display', 'Georgia', serif;
    font-style: italic;
    font-weight: 900;
    letter-spacing: -0.02em;
}

.hero__title-line--mono {
    font-family: 'JetBrains Mono', 'Courier New', monospace;
    font-weight: 700;
    font-size: 0.35em;
    letter-spacing: 0.2em;
    margin-top: 0.5rem;
}

.hero__title-line--accent {
    color: var(--accent);
    -webkit-text-stroke: 3px var(--fg);
    paint-order: stroke fill;
}

.hero__sub {
    margin-top: 2rem;
    font-family: 'Space Mono', 'Courier New', monospace;
    font-size: clamp(0.65rem, 1.2vw, 0.85rem);
    font-weight: 700;
    letter-spacing: 0.18em;
    color: var(--fg-muted);
    max-width: 600px;
}

.upload {
    padding: 4rem 2rem;
    border-bottom: var(--border-thick);
}

.upload__zone {
    border: var(--border-thick);
    padding: 4rem 2rem;
    text-align: center;
    cursor: pointer;
    position: relative;
    transition: background 0.15s;
    max-width: 700px;
}

.upload__zone:hover {
    background: var(--surface);
}

.upload__zone.drag-over {
    background: var(--accent);
}

.upload__icon {
    margin-bottom: 1.5rem;
}

.upload__text {
    font-family: 'Bebas Neue', 'Impact', sans-serif;
    font-size: 2rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.upload__text--small {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.7rem;
    font-weight: 700;
    color: var(--fg-muted);
    margin-top: 0.5rem;
    letter-spacing: 0.12em;
}

.upload__input {
    position: absolute;
    inset: 0;
    opacity: 0;
    cursor: pointer;
}

.options__title {
    font-family: 'Bebas Neue', 'Impact', sans-serif;
    font-size: 2.5rem;
    letter-spacing: 0.05em;
    margin-bottom: 2rem;
    margin-top: 3rem;
    text-transform: uppercase;
}

.options__grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 0;
    border: var(--border);
    max-width: 700px;
}

.option {
    display: flex;
    align-items: center;
    padding: 0.8rem 1rem;
    border-bottom: 1px solid var(--fg);
    border-right: 1px solid var(--fg);
    cursor: pointer;
    transition: background 0.15s;
}

.option:hover {
    background: var(--surface);
}

.option:nth-child(3n) {
    border-right: none;
}

.option__input {
    width: 18px;
    height: 18px;
    border: 2px solid var(--fg);
    margin-right: 0.8rem;
    cursor: pointer;
    accent-color: var(--accent);
    flex-shrink: 0;
}

.option__label {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.options__row {
    margin-top: 2rem;
    max-width: 700px;
}

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

.option-label {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

.options__buttons {
    display: flex;
    gap: 0;
}

.btn {
    padding: 0.7rem 1.5rem;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    border: var(--border);
    background: var(--bg);
    color: var(--fg);
    cursor: pointer;
    transition: background 0.15s, color 0.15s;
    margin-left: -3px;
}

.btn:first-child {
    margin-left: 0;
}

.btn:hover {
    background: var(--surface);
}

.btn--active {
    background: var(--fg);
    color: var(--bg);
}

.btn--patch {
    margin-top: 2rem;
    padding: 1.2rem 3rem;
    font-family: 'Bebas Neue', 'Impact', sans-serif;
    font-size: 1.5rem;
    letter-spacing: 0.08em;
    background: var(--accent);
    color: var(--accent-fg);
    border: var(--border-thick);
}

.btn--patch:hover {
    background: var(--fg);
    color: var(--accent);
}

.btn--patch:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.about {
    padding: 4rem 2rem;
    border-bottom: var(--border-thick);
}

.about__grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 0;
    max-width: 900px;
}

.about__block {
    padding: 2rem;
    border: var(--border);
    margin-left: -3px;
    margin-top: -3px;
}

.about__heading {
    font-family: 'Bebas Neue', 'Impact', sans-serif;
    font-size: 1.5rem;
    letter-spacing: 0.05em;
    margin-bottom: 1rem;
    text-transform: uppercase;
}

.about__text {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 0.85rem;
    font-weight: 500;
    line-height: 1.6;
    letter-spacing: 0.01em;
}

.about__text--mono {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.7rem;
    letter-spacing: 0.05em;
}

.footer {
    padding: 2rem;
    text-align: center;
}

.footer__social {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
}

.footer__link {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.12em;
    color: var(--accent);
    text-decoration: none;
    text-transform: uppercase;
}

.footer__link:hover {
    text-decoration: underline;
}

.footer__text {
    font-family: 'Space Mono', monospace;
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--fg-muted);
}

.status {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: var(--fg);
    color: var(--accent);
    padding: 1rem 2rem;
    z-index: 200;
}

.status__bar {
    height: 4px;
    background: var(--surface);
    margin-bottom: 0.5rem;
    overflow: hidden;
}

.status__fill {
    height: 100%;
    background: var(--accent);
    width: 0%;
    transition: width 0.3s;
}

.status__text {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.15em;
    text-transform: uppercase;
}

@media (max-width: 768px) {
    .header {
        flex-direction: column;
        gap: 1rem;
    }

    .header__left {
        flex-direction: column;
        gap: 1rem;
    }

    .hero {
        padding: 3rem 1.5rem;
    }

    .upload,
    .about {
        padding: 2rem 1.5rem;
    }

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

    .option:nth-child(3n) {
        border-right: 1px solid var(--fg);
    }

    .option:nth-child(2n) {
        border-right: none;
    }
}