:root {
    color-scheme: dark;
    --bg: #0a1428;
    --bg-soft: #1a2847;
    --panel: rgba(15, 25, 50, 0.92);
    --panel-border: rgba(255, 205, 0, 0.25);
    --text: #ffffff;
    --muted: #e8e8e8;
    --accent: #ffd700;
    --accent-strong: #ffed4e;
    --success: #34d399;
    --shadow: 0 24px 80px rgba(2, 6, 23, 0.6);
    --colombia-blue: #003087;
    --colombia-yellow: #ffd700;
    --colombia-red: #ce1126;
}

* {
    box-sizing: border-box;
}

html, body {
    margin: 0;
    min-height: 100%;
}

body {
    font-family: "Segoe UI", system-ui, -apple-system, sans-serif;
    background:
        radial-gradient(circle at top left, rgba(255, 205, 0, 0.15), transparent 35%),
        radial-gradient(circle at bottom right, rgba(206, 17, 38, 0.12), transparent 35%),
        linear-gradient(135deg, var(--colombia-blue), #0a1428 50%, #1a1a2e);
    color: var(--text);
    position: relative;
}

/* Elementos decorativos de fondo */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        repeating-linear-gradient(
            0deg,
            rgba(255, 205, 0, 0.02) 0px,
            rgba(255, 205, 0, 0.02) 40px,
            transparent 40px,
            transparent 80px
        );
    pointer-events: none;
    z-index: -1;
}

.shell {
    width: min(960px, calc(100% - 32px));
    margin: 0 auto;
    padding: 48px 0 64px;
    position: relative;
    z-index: 1;
}

.hero {
    margin-bottom: 24px;
}

.eyebrow {
    margin: 0 0 10px;
    color: var(--colombia-yellow);
    letter-spacing: 0.18em;
    text-transform: uppercase;
    font-size: 0.85rem;
    font-weight: 700;
    text-shadow: 0 0 20px rgba(255, 205, 0, 0.3);
}

h1 {
    margin: 0;
    font-size: clamp(2.4rem, 5vw, 4.8rem);
    line-height: 0.95;
    max-width: 12ch;
    color: var(--colombia-yellow);
    text-shadow: 0 4px 12px rgba(255, 205, 0, 0.2);
}

.lede {
    max-width: 60ch;
    margin: 18px 0 0;
    color: var(--muted);
    font-size: 1.05rem;
    line-height: 1.6;
}

.card {
    background: var(--panel);
    border: 2px solid var(--panel-border);
    border-radius: 24px;
    padding: 24px;
    box-shadow: var(--shadow);
    backdrop-filter: blur(14px);
    position: relative;
    overflow: hidden;
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, var(--colombia-yellow), var(--colombia-red), var(--colombia-blue));
}

.card + .card {
    margin-top: 18px;
}

.subtle {
    background: rgba(15, 25, 50, 0.6);
    border-color: rgba(255, 205, 0, 0.15);
}

.form {
    display: grid;
    gap: 12px;
}

label, .result-label, h2 {
    font-weight: 700;
    color: var(--colombia-yellow);
}

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

.message, li {
    color: var(--muted);
}

.input-row {
    display: flex;
    gap: 12px;
}

input {
    flex: 1;
    min-width: 0;
    border: 2px solid rgba(255, 205, 0, 0.2);
    background: rgba(10, 20, 40, 0.95);
    color: var(--text);
    border-radius: 16px;
    padding: 16px 18px;
    font-size: 1rem;
    outline: none;
    transition: all 0.3s ease;
}

input:focus {
    border-color: var(--colombia-yellow);
    background: rgba(10, 20, 40, 0.99);
    box-shadow: 0 0 0 4px rgba(255, 205, 0, 0.2);
}

button {
    border: 0;
    border-radius: 16px;
    padding: 14px 18px;
    background: linear-gradient(135deg, var(--colombia-yellow), #ffed4e);
    color: var(--colombia-blue);
    font-weight: 800;
    cursor: pointer;
    transition: all 0.3s ease;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

button:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(255, 205, 0, 0.3);
}

button:active {
    transform: translateY(0);
}

.message {
    min-height: 1.4em;
    margin-top: 14px;
    font-size: 0.95rem;
}

.result {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    margin-top: 18px;
    padding: 18px;
    border-radius: 18px;
    background: linear-gradient(135deg, rgba(255, 205, 0, 0.1), rgba(206, 17, 38, 0.1));
    border: 2px solid rgba(255, 205, 0, 0.3);
}

.result a {
    color: var(--colombia-yellow);
    font-size: 1.05rem;
    font-weight: 600;
    word-break: break-all;
    text-decoration: none;
}

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

.hidden {
    display: none;
}

ol, ul {
    margin: 12px 0 0;
    padding-left: 20px;
    line-height: 1.8;
}

h2 {
    color: var(--colombia-yellow);
    margin-top: 0;
}

@media (max-width: 640px) {
    .shell {
        width: min(100% - 20px, 960px);
        padding-top: 28px;
    }

    .input-row,
    .result {
        flex-direction: column;
        align-items: stretch;
    }

    button {
        width: 100%;
    }

    h1 {
        font-size: clamp(1.8rem, 4vw, 2.8rem);
    }
}