:root {
        --brand: #4f46e5;
        --brand2: #7c3aed;
        --bg: #f6f7fb;
        --card: #ffffff;
        --text: #111827;
        --muted: #6b7280;
        --line: #e5e7eb;
        --ok: #16a34a;
        --low: #dc2626;
        --radius: 16px;
        --shadow: 0 4px 20px rgba(17, 24, 39, .06);
}

* {
        box-sizing: border-box;
}

html {
        scroll-behavior: smooth;
}

body {
        margin: 0;
        font-family: 'Inter', system-ui, -apple-system, 'Segoe UI', sans-serif;
        background: var(--bg);
        color: var(--text);
        line-height: 1.6;
        min-height: 100vh;
        display: flex;
        flex-direction: column;
}

main {
        flex: 1;
        width: 100%;
        max-width: 1000px;
        margin: 0 auto;
        padding: 32px 20px;
}

a {
        color: var(--brand);
        text-decoration: none;
}

h2 {
        font-size: 1.8rem;
        margin: 0 0 20px;
}

h3 {
        margin: 28px 0 14px;
        font-size: 1.15rem;
}

/* NAVBAR */
.nav {
        position: sticky;
        top: 0;
        z-index: 10;
        display: flex;
        justify-content: space-between;
        align-items: center;
        padding: 14px 28px;
        background: rgba(255, 255, 255, .85);
        backdrop-filter: blur(10px);
        border-bottom: 1px solid var(--line);
}

.nav .brand {
        font-weight: 800;
        font-size: 1.3rem;
        letter-spacing: -.5px;
        background: linear-gradient(90deg, var(--brand), var(--brand2));
        -webkit-background-clip: text;
        background-clip: text;
        color: transparent;
}

.nav div {
        display: flex;
        gap: 6px;
}

.nav div a {
        color: var(--text);
        padding: 8px 14px;
        border-radius: 10px;
        font-weight: 500;
        font-size: .95rem;
}

.nav div a:hover {
        background: #eef0ff;
        color: var(--brand);
}

/* FOOTER */
.foot {
        text-align: center;
        padding: 24px;
        color: var(--muted);
        font-size: .85rem;
        border-top: 1px solid var(--line);
        background: var(--card);
}

/* HERO */
.hero {
        text-align: center;
        padding: 80px 20px 60px;
        margin: -32px -20px 40px;
        background: linear-gradient(135deg, #eef0ff 0%, #f5ecff 100%);
        border-radius: 0 0 40px 40px;
}

.hero h1 {
        font-size: clamp(2rem, 5vw, 3.2rem);
        line-height: 1.15;
        margin: 0 0 16px;
        letter-spacing: -1px;
}

.hero p {
        color: var(--muted);
        font-size: 1.15rem;
        max-width: 560px;
        margin: 0 auto 28px;
}

/* BUTTONS */
.btn {
        display: inline-block;
        background: linear-gradient(135deg, var(--brand), var(--brand2));
        color: #fff;
        border: 0;
        padding: 12px 26px;
        border-radius: 12px;
        font-size: 1rem;
        font-weight: 600;
        cursor: pointer;
        box-shadow: 0 6px 16px rgba(79, 70, 229, .3);
        transition: transform .15s, box-shadow .15s;
}

.btn:hover {
        transform: translateY(-2px);
        box-shadow: 0 10px 22px rgba(79, 70, 229, .35);
}

.btn.secondary {
        background: #fff;
        color: var(--text);
        border: 1px solid var(--line);
        box-shadow: none;
}

/* CARDS & GRID */
.grid {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
        gap: 16px;
}

.card {
        background: var(--card);
        border-radius: var(--radius);
        padding: 20px;
        box-shadow: var(--shadow);
        border: 1px solid var(--line);
}

a.card {
        display: block;
        color: inherit;
        transition: transform .15s, box-shadow .15s;
}

a.card:hover {
        transform: translateY(-3px);
        box-shadow: 0 10px 28px rgba(17, 24, 39, .12);
}

a.card b {
        font-size: 1.05rem;
}

a.card .low,
a.card .ok {
        float: right;
        font-weight: 700;
        font-size: 1.1rem;
}

.stat {
        text-align: center;
}

.stat .big {
        font-size: 2.6rem;
        font-weight: 800;
        letter-spacing: -1px;
}

.muted {
        color: var(--muted);
        font-size: .9rem;
}

.ok {
        color: var(--ok);
}

.low {
        color: var(--low);
}

.center {
        text-align: center;
}

/* PROGRESS BAR */
.bar {
        height: 10px;
        background: #eceef3;
        border-radius: 999px;
        overflow: hidden;
        margin: 14px 0 10px;
        clear: both;
}

.bar span {
        display: block;
        height: 100%;
        background: linear-gradient(90deg, #22c55e, #16a34a);
        border-radius: 999px;
        transition: width .6s;
}

.bar span.low {
        background: linear-gradient(90deg, #f87171, #dc2626);
}

/* FORMS */
input[type=number],
textarea {
        width: 100%;
        padding: 12px;
        border: 1px solid var(--line);
        border-radius: 10px;
        font-size: 1rem;
        font-family: inherit;
        background: #fafafa;
}

input:focus,
textarea:focus {
        outline: 2px solid var(--brand);
        background: #fff;
}

input[type=range] {
        width: 100%;
        accent-color: var(--brand);
}

label {
        display: block;
        margin: 14px 0 6px;
        font-weight: 600;
}

ol,
ul {
        padding-left: 20px;
}

@media (max-width:600px) {
        .nav {
                padding: 12px 14px;
        }

        .nav div a {
                padding: 6px 8px;
                font-size: .85rem;
        }

        main {
                padding: 20px 14px;
        }

        .hero {
                padding: 50px 16px 40px;
                margin: -20px -14px 30px;
        }
}