:root {
    --bg: #0f1720;
    --card: #0b1a26;
    --accent: #7dd3fc;
    --accent2: #60a5fa;
    --muted: #94a3b8;
    --radius: 20px;
    --gap: 20px;
    --max-w: 1200px;
    --nav-height: 60px;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: Inter, system-ui, -apple-system, "Segoe UI", Roboto, Arial;
    background: radial-gradient(1200px 600px at 10% 10%, rgba(125,211,252,0.05), transparent 12%), radial-gradient(900px 400px at 90% 90%, rgba(99,102,241,0.04), transparent 8%), var(--bg);
    color: #e6eef6;
}

header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--nav-height);
    background: var(--card);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 30px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.5);
    z-index: 100;
}

    header h1 {
        font-size: 24px;
        margin: 0;
        background: linear-gradient(90deg, var(--accent), var(--accent2));
        -webkit-background-clip: text;
        -webkit-text-fill-color: transparent;
    }

nav a {
    color: #e6eef6;
    text-decoration: none;
    margin-left: 20px;
    font-weight: 600;
    transition: 0.2s;
}

    nav a:hover {
        color: var(--accent);
    }

.container {
    max-width: var(--max-w);
    margin: calc(var(--nav-height)+40px) auto 40px;
    padding: 0 20px;
}

.hero {
    text-align: center;
    margin-bottom: 60px;
}

    .hero h2 {
        font-size: 42px;
        margin: 0 0 12px;
        background: linear-gradient(90deg, var(--accent), var(--accent2));
        -webkit-background-clip: text;
        -webkit-text-fill-color: transparent;
    }

    .hero p {
        font-size: 20px;
        color: var(--muted);
    }

.section {
    margin-bottom: 60px;
}

    .section h3 {
        font-size: 28px;
        margin-bottom: 20px;
        border-bottom: 2px solid var(--accent2);
        display: inline-block;
        padding-bottom: 4px;
    }

.cards {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
}

.card {
    background: var(--card);
    border-radius: var(--radius);
    flex: 1 1 220px;
    padding: 20px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    transition: all 0.25s ease;
    box-shadow: 0 6px 20px rgba(0,0,0,0.5);
}

    .card:hover {
        transform: translateY(-6px);
        box-shadow: 0 12px 30px rgba(0,0,0,0.7);
        background: linear-gradient(180deg, rgba(125,211,252,0.08), rgba(96,165,250,0.03));
    }

    .card div {
        font-size: 18px;
        margin-bottom: 12px;
    }

    .card a {
        text-decoration: none;
        color: #04273b;
        font-weight: 600;
        text-align: center;
        padding: 10px;
        border-radius: 10px;
        background: linear-gradient(90deg, var(--accent), var(--accent2));
        transition: 0.2s;
    }

        .card a:hover {
            transform: translateY(-2px);
        }

/* Common input styles for tools */
input, textarea, button {
    font-family: inherit;
    border-radius: var(--radius);
    border: none;
    padding: 10px;
    margin-top: 12px;
}

input, textarea {
    width: 100%;
    background: var(--card);
    color: #e6eef6;
    resize: none;
}

button {
    cursor: pointer;
    font-weight: 600;
    color: #04273b;
    background: linear-gradient(90deg, var(--accent), var(--accent2));
    box-shadow: 0 6px 14px rgba(31,41,55,0.4);
    transition: transform 0.2s ease;
}

    button:hover {
        transform: translateY(-2px);
    }

.output {
    margin-top: 12px;
    background: var(--card);
    padding: 12px;
    border-radius: var(--radius);
    word-break: break-word;
}