:root {
    --bg: #f3f8eb;
    --bg-soft: #fbfff5;
    --card: #ffffff;
    --text: #1e2b1d;
    --muted: #61705b;
    --primary: #2f4a26;
    --primary-dark: #172414;
    --primary-light: #a8d85f;
    --accent: #d51b96;
    --accent-soft: #fde7f5;
    --border: #dbe8ca;
    --success: #2f6f45;
    --danger: #b42318;
    --shadow: 0 14px 32px rgba(31, 55, 24, 0.10);
}

* { box-sizing: border-box; }
body {
    margin: 0;
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    background:
        radial-gradient(circle at top left, rgba(168,216,95,.22), transparent 32rem),
        linear-gradient(180deg, var(--bg-soft), var(--bg));
    color: var(--text);
}

a { color: var(--primary); text-decoration: none; font-weight: 650; }
a:hover { color: var(--accent); text-decoration: none; }

.header {
    background: rgba(255, 255, 255, 0.94);
    border-bottom: 1px solid var(--border);
    padding: 14px 24px;
    position: sticky;
    top: 0;
    z-index: 10;
    backdrop-filter: blur(10px);
}
.nav {
    max-width: 1120px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 18px;
}
.logo {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    color: var(--primary-dark);
}
.logo:hover { color: var(--primary-dark); }
.brand-mark {
    width: 56px;
    height: 56px;
    object-fit: contain;
    flex: 0 0 auto;
    filter: drop-shadow(0 4px 8px rgba(23, 36, 20, .18));
}
.brand-text { display: flex; flex-direction: column; line-height: 1.05; }
.brand-name {
    font-weight: 900;
    letter-spacing: .03em;
    text-transform: uppercase;
}
.brand-subtitle {
    margin-top: 4px;
    color: var(--muted);
    font-size: 13px;
    font-weight: 700;
}
.nav-links { display: flex; gap: 10px; flex-wrap: wrap; justify-content: flex-end; }
.nav-links a {
    color: var(--primary-dark);
    border-radius: 999px;
    padding: 8px 11px;
}
.nav-links a:hover { background: var(--accent-soft); color: var(--accent); }

.container {
    max-width: 1120px;
    margin: 30px auto;
    padding: 0 20px;
}
.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
}
.card {
    background: rgba(255,255,255,.96);
    border: 1px solid var(--border);
    border-radius: 20px;
    padding: 24px;
    box-shadow: var(--shadow);
}
.hero {
    position: relative;
    overflow: hidden;
    padding: 42px;
    border-radius: 24px;
    background:
        radial-gradient(circle at 88% 18%, rgba(213,27,150,.34), transparent 13rem),
        radial-gradient(circle at 8% 8%, rgba(168,216,95,.60), transparent 18rem),
        linear-gradient(135deg, #172414, #2f4a26 58%, #82b845);
    color: white;
    margin-bottom: 24px;
    box-shadow: var(--shadow);
}
.hero::after {
    content: "Knowledge is light";
    position: absolute;
    right: 28px;
    bottom: 18px;
    color: rgba(255,255,255,.14);
    font-size: clamp(32px, 7vw, 82px);
    font-weight: 900;
    letter-spacing: .02em;
    pointer-events: none;
}
.hero h1 { margin: 0 0 10px; font-size: clamp(32px, 5vw, 52px); line-height: .98; text-transform: lowercase; }
.hero p { margin: 0; opacity: 0.95; max-width: 680px; font-size: 17px; }

h1, h2, h3 { margin-top: 0; color: var(--primary-dark); }
.hero h1 { color: white; }
label { display: block; font-weight: 750; margin: 14px 0 6px; color: var(--primary-dark); }
input, textarea {
    width: 100%;
    padding: 12px 13px;
    border: 1px solid var(--border);
    border-radius: 12px;
    font: inherit;
    background: #fffef9;
}
input:focus, textarea:focus {
    outline: 3px solid rgba(168, 216, 95, .35);
    border-color: var(--primary-light);
}
textarea { min-height: 88px; resize: vertical; }
button, .button {
    display: inline-block;
    border: 0;
    border-radius: 999px;
    padding: 12px 18px;
    background: var(--primary);
    color: white;
    font-weight: 800;
    cursor: pointer;
    margin-top: 16px;
    box-shadow: 0 8px 18px rgba(47, 74, 38, .18);
}
button:hover, .button:hover { background: var(--primary-dark); color: white; text-decoration: none; }
.secondary { background: var(--primary-light); color: var(--primary-dark); }
.secondary:hover { background: #92c94d; color: var(--primary-dark); }

.message { padding: 12px 14px; border-radius: 12px; margin-bottom: 14px; border: 1px solid transparent; }
.message.success { background: #e8f7dc; color: var(--success); border-color: #c6e8b1; }
.message.error { background: #fee4e2; color: var(--danger); border-color: #fecdca; }
.message.info { background: #fff6db; color: #6f4d00; border-color: #f3dd9a; overflow-wrap: anywhere; }

.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; }
th, td { padding: 13px 10px; border-bottom: 1px solid var(--border); text-align: left; }
th { color: var(--muted); font-size: 12px; text-transform: uppercase; letter-spacing: .08em; }
.rank { font-weight: 900; color: var(--accent); }
.stat {
    font-size: 46px;
    font-weight: 900;
    color: var(--primary);
    line-height: 1;
}
.small { color: var(--muted); font-size: 14px; }
.empty { color: var(--muted); padding: 12px 0; }
.narrow { max-width: 560px; margin: 0 auto; }
.actions { min-width: 360px; }
.inline-form { display: inline-block; margin: 0 6px 6px 0; }
.inline-form button, .reset-form button { margin-top: 0; padding: 8px 10px; font-size: 13px; }
.reset-form { display: flex; gap: 8px; align-items: center; margin-top: 6px; }
.reset-form input { max-width: 180px; padding: 8px 10px; }
button.danger, .danger { background: var(--danger); color: white; }
button.danger:hover, .danger:hover { background: #7a271a; }

.summary-grid { margin-bottom: 20px; }
.leaderboard-card { margin-top: 20px; }
.leaderboard-table .bar-cell { min-width: 220px; width: 45%; }
.bar-track {
    width: 100%;
    height: 18px;
    background: #eaf3df;
    border: 1px solid var(--border);
    border-radius: 999px;
    overflow: hidden;
}
.bar-fill {
    height: 100%;
    min-width: 0;
    background: linear-gradient(90deg, var(--primary), var(--primary-light), var(--accent));
    border-radius: 999px;
}
.form-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
    gap: 14px;
    align-items: end;
}
.checkbox-row label {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-top: 0;
}
.checkbox-row input { width: auto; }
.admin-add-user button { margin-top: 18px; }
.small-button {
    padding: 8px 10px;
    font-size: 13px;
    margin-top: 0;
}

@media (max-width: 720px) {
    .nav { align-items: flex-start; flex-direction: column; }
    .nav-links { justify-content: flex-start; }
    .hero { padding: 30px 24px; }
    .brand-mark { width: 48px; height: 48px; }
}