:root {
    --page-text:     #f5f7fb;
    --page-muted:    #c7d0dc;
    --page-subtle:   #6b83a1cc;
    --surface:       #1f1f1f;
    --border:        #38383a;
    --border-strong: #4a4a4d;
    --edge-blue:     rgba(103, 178, 255, 0.55);
    --accent:        #86c7ff;
    --accent-strong: #2899f5;
    --success:       #9fdcb2;
    --success-bg:    rgba(21, 74, 37, 0.45);
    --success-border:rgba(92, 168, 112, 0.5);
    --danger:        #ffb3b3;
    --danger-bg:     rgba(110, 31, 31, 0.45);
    --danger-border: rgba(229, 137, 137, 0.48);
}

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

html, body {
    min-height: 100%;
    font-family: "Segoe UI", SegoeUI, "Helvetica Neue", Arial, sans-serif;
    font-synthesis: none;
    text-rendering: optimizeLegibility;
    -webkit-font-smoothing: antialiased;
    color: var(--page-text);
    background:
        radial-gradient(circle at 12% 8%,  rgba(0, 120, 212, 0.18), transparent 28%),
        radial-gradient(circle at 82% 14%, rgba(24, 99, 81, 0.12),  transparent 24%),
        radial-gradient(circle at 50% 100%,rgba(147, 92, 32, 0.08), transparent 30%),
        linear-gradient(135deg, rgba(255, 255, 255, 0.02) 0%, transparent 42%),
        linear-gradient(180deg, #151515 0%, #1d1d1f 42%, #232326 100%);
    background-attachment: fixed;
}

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

/* ── Shell ─────────────────────────────────────────── */

.shell {
    width: min(100%, 980px);
    margin: 0 auto;
    padding: 64px 20px 72px;
}

/* ── Intro ─────────────────────────────────────────── */

.intro {
    margin-bottom: 36px;
    text-align: center;
}

.eyebrow {
    margin-bottom: 0.75rem;
    font-size: 0.9rem;
    font-weight: 400;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--accent);
}

.version-badge {
    padding: 2px 6px;
    border-radius: 999px;
    border: 1px solid rgba(193, 146, 255, 0.45);
    background: linear-gradient(135deg, rgba(147, 92, 255, 0.18), rgba(193, 146, 255, 0.08));
    color: #f0dcff;
    font-size: 0.6rem;
    font-weight: 400;
    letter-spacing: 0.04em;
    text-transform: none;
}

.intro h1 {
    font-size: clamp(3rem, 7vw, 4.6rem);
    line-height: 0.98;
    letter-spacing: -0.03em;
}

.lede {
    margin-top: 1rem;
    font-size: 1.08rem;
    line-height: 1.65;
    color: var(--page-muted);
}

/* ── Card ──────────────────────────────────────────── */

.card {
    padding: 32px;
    border: 1px solid var(--border);
    border-radius: 14px;
    background: linear-gradient(180deg, #1f1f20fa, #1f1f1ffa);
    box-shadow:
        inset 1px 0 0 var(--edge-blue),
        inset 0 1px #ffffff08,
        inset 0 0 0 1px #ffffff05,
        0 28px 80px #00000057;
}

.card h2 {
    font-size: 1.75rem;
    line-height: 1.15;
    letter-spacing: -0.02em;
    margin-bottom: 24px;
}

/* ── Form ──────────────────────────────────────────── */

form {
    display: grid;
    gap: 18px;
}

.field {
    display: grid;
    gap: 6px;
}

.field label {
    font-weight: 700;
}

.field input {
    width: 100%;
    padding: 13px 14px;
    border: 1px solid var(--border-strong);
    border-radius: 8px;
    font: inherit;
    font-weight: 500;
    font-size: 1rem;
    line-height: 1.5;
    color: var(--page-text);
    background:
        linear-gradient(90deg, #67b2ff29 0, #67b2ff0d 2px, #181818 10px),
        #181818;
    transition: border-color 140ms, box-shadow 140ms, background 140ms;
}

.field input::placeholder {
    color: #8f99a7;
    font-weight: 400;
    transition: color 120ms;
}

.field input:focus::placeholder {
    color: transparent;
}

.field input:focus {
    outline: none;
    border-color: var(--accent-strong);
    background:
        linear-gradient(90deg, #86c7ff3d 0, #86c7ff14 3px, #181818 12px),
        #181818;
    box-shadow: 0 0 0 3px rgba(40, 153, 245, 0.28);
}

.field input.is-error {
    border-color: #c75d5d;
    background:
        linear-gradient(90deg, #e5898938 0, #e589890f 2px, #261516 10px),
        #261516;
}

.field small {
    font-size: 0.82rem;
    color: var(--page-subtle);
    transition: color 140ms;
}

.field:focus-within small {
    color: rgba(134, 199, 255, 0.65);
}

.field-error {
    font-size: 0.88rem;
    color: var(--danger);
    min-height: 1.1em;
}

.actions {
    display: flex;
    align-items: center;
    gap: 14px;
    flex-wrap: wrap;
    padding-top: 4px;
}

/* ── Button ────────────────────────────────────────── */

.button-primary {
    padding: 12px 20px;
    border: 1px solid transparent;
    border-radius: 14px;
    background: linear-gradient(135deg, #1c7ed6 0%, #0f6cbd 52%, #7a5cff 100%);
    color: #fff;
    font: inherit;
    font-weight: 700;
    font-size: 1rem;
    cursor: pointer;
    transition: transform 120ms, filter 120ms;
}

.button-primary:hover:not(:disabled) {
    filter: brightness(1.12);
    transform: translateY(-1px);
}

.button-primary:disabled {
    background: linear-gradient(135deg, #1a2a3d, #1e1e2e);
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

/* ── Status banners ────────────────────────────────── */

.status-banner {
    border-radius: 8px;
    padding: 12px 14px;
    line-height: 1.5;
    font-size: 0.95rem;
}

.status-error {
    color: var(--danger);
    background: var(--danger-bg);
    border: 1px solid var(--danger-border);
}

.status-success {
    color: var(--success);
    background: var(--success-bg);
    border: 1px solid var(--success-border);
}

.result-success {
    margin-top: 20px;
}

.result-label {
    margin-bottom: 6px;
    font-size: 0.78rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.result-url {
    display: inline-block;
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--accent);
    word-break: break-all;
}

.result-url:hover {
    text-decoration: underline;
}

/* ── Footer ────────────────────────────────────────── */

.shell-footer {
    margin-top: 28px;
    padding-top: 18px;
    border-top: 1px solid var(--border);
    text-align: center;
    font-size: 0.86rem;
    color: var(--page-subtle);
}

.footer-sig {
    background: linear-gradient(135deg, #deaa4a, #e44280 52%, #d348f6);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    font-weight: 700;
}

/* ── Responsive ────────────────────────────────────── */

@media (max-width: 560px) {
    .shell {
        padding: 32px 14px 48px;
    }

    .card {
        padding: 20px;
    }

    .intro h1 {
        font-size: clamp(2.4rem, 10vw, 3rem);
    }

    .button-primary {
        width: 100%;
        justify-content: center;
    }
}