:root {
    --bg-1: #f0f4ff;
    --bg-2: #e0e7ff;
    --glow-1: #a5b4fc;
    --glow-2: #93c5fd;

    --panel: rgba(255, 255, 255, 0.96);
    --text: #1e293b;
    --muted: #64748b;
    --border: rgba(15, 23, 42, 0.16);

    --primary: #2563eb;
    --primary-600: #1d4ed8;

    --ok: #16a34a;
    --warn: #ea580c;
    --bad:  #dc2626;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg-1: #0f172a;
        --bg-2: #1e293b;
        --glow-1: #1e3a8a;
        --glow-2: #0c4a6e;

        --panel: rgba(30, 41, 59, 0.85);
        --text: #f1f5f9;
        --muted: #cbd5e1;
        --border: rgba(203, 213, 225, 0.3);

        --primary: #3b82f6;
        --primary-600: #2563eb;
    }
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
    margin: 0;
    font: 16px/1.5 system-ui, -apple-system, Segoe UI, Roboto, Inter, Arial, sans-serif;
    color: var(--text);
    background:
            radial-gradient(1200px 600px at 10% -20%, var(--glow-1) 0%, transparent 40%),
            radial-gradient(1200px 600px at 120% 120%, var(--glow-2) 0%, transparent 40%),
            linear-gradient(180deg, var(--bg-1) 0%, var(--bg-2) 100%);
    display: grid;
    place-items: center;
    padding: 24px;
}

h1 {
    margin: 0 0 14px;
    font-size: clamp(22px, 3vw, 28px);
    font-weight: 700;
    letter-spacing: -0.02em;
    text-align: center;
    color: var(--text);
}

form {
    width: min(92vw, 480px);
    background: var(--panel);
    border: 1px solid var(--border);
    padding: 20px 18px;
    border-radius: 16px;
    backdrop-filter: blur(12px);
    box-shadow:
            0 10px 30px rgba(2, 6, 23, 0.15),
            0 2px 6px rgba(2, 6, 23, 0.08);
}

label {
    display: block;
    margin: 0 0 8px;
    font-size: 13px;
    font-weight: 600;
    letter-spacing: 0.02em;
    color: var(--muted);
}

input[type="password"] {
    width: 100%;
    padding: 12px 14px;
    border-radius: 12px;
    border: 1.5px solid var(--border);
    background: #f9fafb; /* delikatniejszy biały */
    color: #111827; /* ciemniejszy, ale łagodniejszy tekst */
    font-size: 15px;
    outline: none;
    transition: border-color 160ms ease, box-shadow 160ms ease, background-color 160ms ease;
}

@media (prefers-color-scheme: dark) {
    input[type="password"] {
        background: #273449; /* jaśniejsze tło */
        color: #f1f5f9;
        border-color: rgba(203, 213, 225, 0.3); /* lekko jaśniejszy border */
    }
}

input[type="password"]:hover {
    border-color: color-mix(in oklab, var(--primary) 40%, var(--border));
}

input[type="password"]:focus {
    border-color: var(--primary);
    box-shadow:
            0 0 0 3px color-mix(in oklab, var(--primary) 20%, transparent),
            0 4px 12px rgba(37, 99, 235, 0.15);
    background: #ffffff;
}

@media (prefers-color-scheme: dark) {
    input[type="password"]:focus {
        background: #0f172a;
    }
}

.message {
    width: min(92vw, 480px);
    margin: 12px auto 0;
    padding: 12px 14px;
    border-radius: 12px;
    border: 1.5px solid var(--border);
    background: rgba(241, 245, 249, 0.85);
    color: var(--text);
    font-weight: 500;
    font-size: 14px;
    transition: all 200ms ease;
    opacity: 1;
    min-height: 47px;
}

@media (prefers-color-scheme: dark) {
    .message {
        background: rgba(30, 41, 59, 0.75);
        border-color: rgba(203, 213, 225, 0.2);
    }
}

/* Hide when empty */
.message:empty {
    visibility: hidden;
}

.message.ok {
    border-color: var(--ok);
    background: color-mix(in oklab, var(--ok) 20%, rgba(241, 245, 249, 0.85));
    color: #15803d;
}

@media (prefers-color-scheme: dark) {
    .message.ok {
        background: color-mix(in oklab, var(--ok) 18%, rgba(30, 41, 59, 0.75));
        color: #86efac;
    }
}

.message.warn {
    border-color: var(--warn);
    background: color-mix(in oklab, var(--warn) 20%, rgba(241, 245, 249, 0.85));
    color: #c2410c;
}

@media (prefers-color-scheme: dark) {
    .message.warn {
        background: color-mix(in oklab, var(--warn) 18%, rgba(30, 41, 59, 0.75));
        color: #fdba74;
    }
}

.message.bad {
    border-color: var(--bad);
    background: color-mix(in oklab, var(--bad) 20%, rgba(241, 245, 249, 0.85));
    color: #b91c1c;
}

@media (prefers-color-scheme: dark) {
    .message.bad {
        background: color-mix(in oklab, var(--bad) 18%, rgba(30, 41, 59, 0.75));
        color: #fca5a5;
    }
}

#strengthBarContainer {
    width: min(92vw, 480px);
    margin: 10px auto 0;
    height: 10px;
    background: #e2e8f0;
    border-radius: 8px;
    overflow: hidden;
}

#strengthBarFill {
    height: 100%;
    width: 0;
    background: var(--bad);
    transition: width 200ms ease, background-color 200ms ease;
}

ul#tipsList {
    width: min(92vw, 480px);
    margin: 10px auto 0;
    padding-left: 20px;
    font-size: 14px;
    color: var(--text);
}