:root {
    --color-primary: #4f46e5;
    --color-primary-dark: #4338ca;
    --color-accent: #14b8a6;
    --color-bg: #f7f8fb;
    --color-surface: #ffffff;
    --color-text: #1f2330;
    --color-text-muted: #667085;
    --color-border: #e4e7ec;
    --color-success: #16a34a;
    --color-error: #dc2626;
    --radius: 10px;
    --shadow: 0 1px 3px rgba(16,24,40,0.08), 0 1px 2px rgba(16,24,40,0.04);
    font-size: 16px;
}

* { box-sizing: border-box; }

body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.5;
}

a { color: var(--color-primary); text-decoration: none; }
a:hover { text-decoration: underline; }

.topbar {
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 10;
}
.topbar-inner {
    max-width: 1100px;
    margin: 0 auto;
    padding: 14px 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 10px;
}
.brand {
    font-weight: 800;
    font-size: 1.15rem;
    color: var(--color-text);
    letter-spacing: 0.3px;
}
.brand span { color: var(--color-primary); }
.topnav { display: flex; gap: 18px; align-items: center; flex-wrap: wrap; font-size: 0.92rem; font-weight: 600; }
.topnav a { color: var(--color-text-muted); }
.topnav a:hover { color: var(--color-primary); text-decoration: none; }
.logout-link { color: var(--color-error) !important; }

.page-wrap {
    max-width: 1100px;
    margin: 0 auto;
    padding: 32px 20px 60px;
    min-height: 60vh;
}

.footer { border-top: 1px solid var(--color-border); margin-top: 40px; }
.footer-inner { max-width: 1100px; margin: 0 auto; padding: 20px; color: var(--color-text-muted); font-size: 0.85rem; }

/* Kartice */
.card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 28px;
}
.card + .card { margin-top: 18px; }

/* Naslov strane */
.page-title { font-size: 1.6rem; font-weight: 800; margin: 0 0 6px; }
.page-subtitle { color: var(--color-text-muted); margin: 0 0 24px; }

/* Forme */
.form-group { margin-bottom: 18px; }
.form-group label { display: block; font-weight: 600; font-size: 0.9rem; margin-bottom: 6px; }
.form-group .hint { color: var(--color-text-muted); font-size: 0.8rem; margin-top: 4px; }
input[type=text], input[type=email], input[type=password], input[type=number], select, textarea {
    width: 100%;
    padding: 11px 13px;
    border: 1px solid var(--color-border);
    border-radius: 8px;
    font-size: 1rem;
    font-family: inherit;
    background: var(--color-surface);
    color: var(--color-text);
}
input:focus, select:focus, textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(79,70,229,0.12);
}
textarea { resize: vertical; min-height: 90px; }

.btn {
    display: inline-block;
    padding: 11px 22px;
    border-radius: 8px;
    border: none;
    font-weight: 700;
    font-size: 0.95rem;
    cursor: pointer;
    text-align: center;
}
.btn-primary { background: var(--color-primary); color: #fff; }
.btn-primary:hover { background: var(--color-primary-dark); text-decoration: none; }
.btn-accent { background: var(--color-accent); color: #fff; }
.btn-accent:hover { opacity: 0.9; text-decoration: none; }
.btn-outline { background: transparent; color: var(--color-primary); border: 1px solid var(--color-primary); }
.btn-outline:hover { background: rgba(79,70,229,0.06); text-decoration: none; }
.btn-danger { background: var(--color-error); color: #fff; }
.btn-block { display: block; width: 100%; }
.btn-sm { padding: 7px 14px; font-size: 0.85rem; }

/* Alerts */
.alert { padding: 12px 16px; border-radius: 8px; margin-bottom: 18px; font-size: 0.92rem; font-weight: 600; }
.alert-error { background: #fef2f2; color: var(--color-error); border: 1px solid #fecaca; }
.alert-success { background: #f0fdf4; color: var(--color-success); border: 1px solid #bbf7d0; }

/* Landing / početna strana */
.landing-hero { text-align: center; margin-bottom: 40px; }
.landing-hero h1 { font-size: 2.1rem; font-weight: 800; margin-bottom: 8px; }
.landing-hero p { color: var(--color-text-muted); font-size: 1.05rem; }
.landing-cols { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
@media (max-width: 720px) {
    .landing-cols { grid-template-columns: 1fr; }
}
.landing-col-title { font-size: 1.1rem; font-weight: 800; margin-bottom: 16px; display: flex; align-items: center; gap: 8px; }
.badge-dot { width: 8px; height: 8px; border-radius: 50%; display: inline-block; }
.badge-student { background: var(--color-accent); }
.badge-teacher { background: var(--color-primary); }

/* Dashboard statistike */
.stats-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 16px; margin-bottom: 24px; }
.stat-box { background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius); padding: 18px; text-align: center; }
.stat-box .num { font-size: 1.7rem; font-weight: 800; color: var(--color-primary); }
.stat-box .label { color: var(--color-text-muted); font-size: 0.82rem; margin-top: 4px; }

/* Tabele */
table { width: 100%; border-collapse: collapse; }
th, td { text-align: left; padding: 10px 12px; border-bottom: 1px solid var(--color-border); font-size: 0.92rem; }
th { color: var(--color-text-muted); font-weight: 700; font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.03em; }

.empty-state { text-align: center; padding: 40px 20px; color: var(--color-text-muted); }

.auth-wrap { max-width: 420px; margin: 30px auto; }
.form-footer-link { text-align: center; margin-top: 16px; font-size: 0.9rem; color: var(--color-text-muted); }