/* =========================================
   Tečaj astronomije — Pulska Zvjezdarnica
   Samostojeći stilovi, usklađeni s css/modern.css
   glavne stranice (ADIP dark + glassmorphism).
   ========================================= */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

/* === Varijable (identične glavnoj stranici) === */
:root {
    --bg-primary: #0a0a0f;
    --bg-secondary: #12121a;
    --bg-card: rgba(20, 20, 35, 0.7);
    --bg-glass: rgba(255, 255, 255, 0.05);
    --border-glass: rgba(255, 255, 255, 0.1);

    --text-primary: #ffffff;
    --text-secondary: #a0a0b0;
    --text-muted: #606075;

    --accent-primary: #00d4ff;
    --accent-secondary: #7c3aed;
    --accent-gradient: linear-gradient(135deg, #00d4ff 0%, #7c3aed 100%);

    --shadow-lg: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 40px rgba(0, 212, 255, 0.15);

    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 32px;

    --transition-fast: 0.2s ease;
    --transition-smooth: 0.4s cubic-bezier(0.16, 1, 0.3, 1);

    /* Razine natjecanja */
    --lvl-skolska: #34d399;
    --lvl-zupanijska: #fbbf24;
    --lvl-drzavna: #f472b6;
}

/* === Osnovni reset === */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
    position: relative;
}

/* Sloj s pozadinskom slikom glavne stranice (uz gradijentnu zamjenu
   ako slika nije dostupna). */
body::before {
    content: '';
    position: fixed;
    inset: 0;
    background:
        url('../background.png') center center / cover no-repeat fixed,
        radial-gradient(ellipse at 30% 10%, #182036 0%, #0a0a0f 60%);
    filter: blur(8px);
    transform: scale(1.05);
    z-index: -2;
}

body::after {
    content: '';
    position: fixed;
    inset: 0;
    background: rgba(10, 10, 15, 0.85);
    z-index: -1;
    pointer-events: none;
}

/* === Tipografija === */
h1,
h2,
h3,
h4,
h5,
h6 {
    font-weight: 600;
    line-height: 1.2;
    letter-spacing: -0.02em;
}

h1 {
    font-size: clamp(2rem, 5vw, 3.5rem);
}

h2 {
    font-size: clamp(1.5rem, 4vw, 2.5rem);
}

h3 {
    font-size: clamp(1.15rem, 3vw, 1.6rem);
}

a {
    color: var(--accent-primary);
    text-decoration: none;
    transition: var(--transition-fast);
}

a:hover {
    color: var(--text-primary);
}

/* === Header === */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 0.5rem 2rem;
    background: rgba(10, 10, 15, 0.8);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-glass);
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
}

.header__logo {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.header__logo img {
    height: 40px;
    width: 40px;
    object-fit: cover;
    border-radius: 50%;
}

.header__title {
    font-size: 1.25rem;
    font-weight: 600;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    white-space: nowrap;
}

.header__subtitle {
    font-size: 0.75rem;
    color: var(--text-muted);
    font-weight: 400;
    white-space: nowrap;
}

/* === Navigacija (sidebar) === */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    width: 280px;
    height: 100vh;
    background: var(--bg-secondary);
    border-right: 1px solid var(--border-glass);
    z-index: 1500;
    transform: translateX(-100%);
    transition: var(--transition-smooth);
    padding: 5rem 1.5rem 2rem;
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    overflow-y: auto;
}

.nav.active {
    transform: translateX(0);
}

.nav__link {
    padding: 0.85rem 1.25rem;
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-size: 0.95rem;
    font-weight: 500;
    transition: var(--transition-fast);
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.nav__link:hover,
.nav__link.active {
    background: var(--bg-glass);
    color: var(--text-primary);
}

.nav__link.active {
    border-left: 3px solid var(--accent-primary);
    background: rgba(0, 212, 255, 0.1);
}

.nav__close {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 1.5rem;
    cursor: pointer;
    transition: var(--transition-fast);
    padding: 0.5rem;
}

.nav__close:hover {
    color: var(--text-primary);
}

.nav__spacer {
    flex: 1;
}

.nav__heading {
    margin: 1rem 0 0.25rem;
    padding: 0 1.25rem;
    font-size: 0.7rem;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--text-muted);
}

.nav-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1400;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition-smooth);
}

.nav-overlay.active {
    opacity: 1;
    visibility: visible;
}

/* === Hamburger === */
.menu-toggle {
    display: flex;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    padding: 10px;
    z-index: 1100;
    position: relative;
    border: none;
    background: none;
}

.menu-toggle span {
    width: 24px;
    height: 2px;
    background: var(--accent-primary);
    border-radius: 2px;
    transition: var(--transition-fast);
}

/* === Gumbi === */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.875rem 1.75rem;
    border-radius: var(--radius-md);
    font-weight: 500;
    font-size: 0.95rem;
    font-family: inherit;
    cursor: pointer;
    border: none;
    transition: var(--transition-smooth);
    text-align: center;
}

.btn--primary {
    background: var(--accent-gradient);
    color: #000;
    box-shadow: 0 4px 15px rgba(0, 212, 255, 0.3);
}

.btn--primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 212, 255, 0.4);
    color: #000;
}

.btn--secondary {
    background: var(--bg-glass);
    border: 1px solid var(--border-glass);
    color: var(--text-primary);
}

.btn--secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
}

.btn--small {
    padding: 0.55rem 1.1rem;
    font-size: 0.85rem;
}

/* === Layout === */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 5%;
}

.container--wide {
    max-width: 1400px;
}

.page-content {
    padding-top: 100px;
    min-height: 100vh;
    padding-bottom: 4rem;
}

.section__header {
    text-align: center;
    margin-bottom: 3rem;
}

.section__title {
    margin-bottom: 0.5rem;
}

.section__subtitle {
    color: var(--text-secondary);
}

.text-center {
    text-align: center;
}

.hidden {
    display: none !important;
}

.text-gradient {
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.glass-card {
    background: var(--bg-glass);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-lg);
    padding: 2rem;
    box-shadow: var(--shadow-lg);
}

/* === Footer === */
.footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-glass);
    padding: 3rem 5%;
    text-align: center;
}

.footer__contact {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.8;
}

.footer__contact a {
    color: var(--accent-primary);
}

/* === Animacije === */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(24px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.animate-in {
    animation: fadeInUp 0.6s ease forwards;
}

.animate-delay-1 {
    animation-delay: 0.1s;
}

.animate-delay-2 {
    animation-delay: 0.2s;
}

.animate-delay-3 {
    animation-delay: 0.3s;
}

/* =========================================
   Specifično za tečaj
   ========================================= */

/* --- Naslovna tečaja: hero --- */
.course-hero {
    padding: 7rem 5% 3rem;
    text-align: center;
}

.course-hero__badge {
    display: inline-block;
    padding: 0.45rem 1.1rem;
    background: var(--bg-glass);
    border: 1px solid var(--border-glass);
    border-radius: 100px;
    font-size: 0.85rem;
    color: var(--accent-primary);
    margin-bottom: 1.25rem;
}

.course-hero__lead {
    font-size: 1.15rem;
    color: var(--text-secondary);
    max-width: 780px;
    margin: 1.25rem auto 2rem;
}

.course-hero__meta {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    justify-content: center;
    margin-bottom: 2rem;
}

.meta-chip {
    padding: 0.4rem 0.9rem;
    background: var(--bg-glass);
    border: 1px solid var(--border-glass);
    border-radius: 100px;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

/* --- Legenda razina --- */
.levels {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1rem;
    margin-top: 1.5rem;
}

.level {
    padding: 1rem 1.15rem;
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-md);
    border-left: 3px solid var(--lvl);
}

.level__name {
    font-weight: 600;
    color: var(--lvl);
    margin-bottom: 0.2rem;
    font-size: 0.95rem;
}

.level__desc {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.level--s {
    --lvl: var(--lvl-skolska);
}

.level--z {
    --lvl: var(--lvl-zupanijska);
}

.level--d {
    --lvl: var(--lvl-drzavna);
}

/* --- Mreža lekcija --- */
.lesson-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
}

.lesson-card {
    display: flex;
    flex-direction: column;
    background: var(--bg-card);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    transition: var(--transition-smooth);
    color: inherit;
    height: 100%;
}

.lesson-card:hover {
    transform: translateY(-5px);
    border-color: var(--accent-primary);
    box-shadow: var(--shadow-glow);
    color: inherit;
}

.lesson-card--soon {
    opacity: 0.55;
    pointer-events: none;
    border-style: dashed;
}

.lesson-card__top {
    display: flex;
    align-items: center;
    gap: 0.85rem;
    margin-bottom: 0.9rem;
}

.lesson-card__num {
    flex: 0 0 auto;
    width: 44px;
    height: 44px;
    display: grid;
    place-items: center;
    border-radius: var(--radius-sm);
    background: rgba(0, 212, 255, 0.12);
    border: 1px solid rgba(0, 212, 255, 0.3);
    color: var(--accent-primary);
    font-weight: 700;
    font-size: 1.05rem;
}

.lesson-card__title {
    font-size: 1.05rem;
    font-weight: 600;
    line-height: 1.3;
}

.lesson-card__subtitle {
    font-size: 0.8rem;
    color: var(--accent-primary);
    margin-top: 0.15rem;
}

.lesson-card__desc {
    color: var(--text-secondary);
    font-size: 0.9rem;
    flex: 1;
}

.lesson-card__foot {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.5rem;
    margin-top: 1.1rem;
    padding-top: 0.9rem;
    border-top: 1px solid var(--border-glass);
    font-size: 0.8rem;
    color: var(--text-muted);
}

.lesson-card__cta {
    color: var(--accent-primary);
    font-weight: 500;
}

.tag-row {
    display: flex;
    flex-wrap: wrap;
    gap: 0.35rem;
    margin-top: 0.85rem;
}

.tag {
    font-size: 0.72rem;
    padding: 0.2rem 0.6rem;
    border-radius: 100px;
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid var(--border-glass);
    color: var(--text-secondary);
}

/* --- Zaglavlje lekcije --- */
.lesson-head {
    display: flex;
    flex-wrap: wrap;
    align-items: flex-start;
    gap: 1.5rem;
    justify-content: space-between;
    padding: 1.5rem 0 2rem;
}

.lesson-head__eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.8rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--accent-primary);
    margin-bottom: 0.6rem;
}

.lesson-head__title {
    font-size: clamp(1.7rem, 4.5vw, 2.8rem);
    margin-bottom: 0.4rem;
}

.lesson-head__subtitle {
    color: var(--text-secondary);
    font-size: 1.05rem;
    max-width: 65ch;
}

.lesson-head__actions {
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
    align-items: stretch;
    min-width: 220px;
}

/* --- Sadržaj lekcije: dvije kolone --- */
.lesson-body {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 1.5rem;
    align-items: start;
}

@media (max-width: 1000px) {
    .lesson-body {
        grid-template-columns: minmax(0, 1fr);
    }
}

.panel {
    background: var(--bg-card);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-lg);
    padding: 1.75rem;
}

.panel--sticky {
    position: sticky;
    top: 90px;
}

.panel__title {
    font-size: 1.2rem;
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.6rem;
}

.panel p {
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.panel ul,
.panel ol {
    color: var(--text-secondary);
    margin: 0 0 1rem 1.25rem;
}

.panel li {
    margin-bottom: 0.4rem;
}

.panel strong {
    color: var(--text-primary);
}

/* --- Tekstualni blokovi --- */
.callout {
    padding: 1rem 1.15rem;
    border-radius: var(--radius-md);
    background: rgba(0, 212, 255, 0.07);
    border: 1px solid rgba(0, 212, 255, 0.25);
    margin: 1.25rem 0;
}

.callout--warn {
    background: rgba(244, 114, 182, 0.08);
    border-color: rgba(244, 114, 182, 0.3);
}

.callout__title {
    font-weight: 600;
    margin-bottom: 0.35rem;
    font-size: 0.95rem;
    color: var(--text-primary);
}

.callout p:last-child {
    margin-bottom: 0;
}

/* --- Formule (bez vanjskih biblioteka) --- */
.formula {
    display: block;
    font-family: 'Cambria Math', 'Latin Modern Math', Georgia, 'Times New Roman', serif;
    font-size: 1.12rem;
    text-align: center;
    padding: 0.85rem 1rem;
    margin: 1rem 0;
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    overflow-x: auto;
}

.formula small {
    display: block;
    font-family: 'Inter', sans-serif;
    font-size: 0.78rem;
    color: var(--text-muted);
    margin-top: 0.35rem;
}

.mvar {
    font-family: 'Cambria Math', Georgia, serif;
    font-style: italic;
    color: var(--accent-primary);
}

/* --- Oznake razina u tekstu --- */
.lvl {
    display: inline-block;
    font-size: 0.68rem;
    font-weight: 700;
    padding: 0.1rem 0.45rem;
    border-radius: 4px;
    vertical-align: 0.1em;
    margin-right: 0.35rem;
    color: #08080c;
}

.lvl--s {
    background: var(--lvl-skolska);
}

.lvl--z {
    background: var(--lvl-zupanijska);
}

.lvl--d {
    background: var(--lvl-drzavna);
}

/* --- Interaktivni modul --- */
.demo {
    background: var(--bg-card);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
}

.demo__head {
    margin-bottom: 1rem;
}

.demo__kicker {
    font-size: 0.72rem;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--accent-secondary);
    font-weight: 600;
}

.demo__title {
    font-size: 1.15rem;
    margin: 0.2rem 0 0.35rem;
}

.demo__hint {
    font-size: 0.86rem;
    color: var(--text-muted);
}

.demo canvas {
    display: block;
    width: 100%;
    height: auto;
    background: #05060b;
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-md);
    touch-action: none;
}

/* --- Kontrole --- */
.controls {
    display: grid;
    gap: 0.85rem;
    margin: 1rem 0;
}

.controls--2 {
    grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
}

.controls--3 {
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
}

.ctrl {
    display: flex;
    flex-direction: column;
    gap: 0.3rem;
}

.ctrl__label {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    gap: 0.5rem;
    font-size: 0.82rem;
    color: var(--text-secondary);
}

.ctrl__value {
    font-variant-numeric: tabular-nums;
    color: var(--accent-primary);
    font-weight: 600;
    font-size: 0.9rem;
    white-space: nowrap;
}

input[type="range"] {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 4px;
    border-radius: 2px;
    background: rgba(255, 255, 255, 0.15);
    outline: none;
    cursor: pointer;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--accent-primary);
    border: none;
    box-shadow: 0 0 10px rgba(0, 212, 255, 0.5);
    cursor: pointer;
}

input[type="range"]::-moz-range-thumb {
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--accent-primary);
    border: none;
    box-shadow: 0 0 10px rgba(0, 212, 255, 0.5);
    cursor: pointer;
}

input[type="number"],
input[type="text"],
input[type="date"],
input[type="time"],
select {
    width: 100%;
    padding: 0.55rem 0.7rem;
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-family: inherit;
    font-size: 0.92rem;
    transition: var(--transition-fast);
}

input:focus,
select:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px rgba(0, 212, 255, 0.12);
}

select option {
    background-color: #12121a;
    color: #ffffff;
}

.btn-row {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin: 0.75rem 0;
}

.chip-btn {
    padding: 0.4rem 0.85rem;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-glass);
    border-radius: 100px;
    color: var(--text-secondary);
    font-family: inherit;
    font-size: 0.82rem;
    cursor: pointer;
    transition: var(--transition-fast);
}

.chip-btn:hover {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
}

.chip-btn.active {
    background: var(--accent-primary);
    border-color: var(--accent-primary);
    color: #05060b;
    font-weight: 600;
}

/* --- Ispis rezultata --- */
.readout {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
    gap: 0.75rem;
    margin-top: 1rem;
}

.readout__item {
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-sm);
    padding: 0.7rem 0.8rem;
}

/* Bez uppercase transformacije: oznake sadrže fizikalne simbole u kojima
   je razlika velikog i malog slova bitna (m i M, h i H, r i R, v i V). */
.readout__label {
    font-size: 0.73rem;
    color: var(--text-muted);
    letter-spacing: 0.03em;
    margin-bottom: 0.2rem;
    line-height: 1.35;
}

.readout__value {
    font-size: 1.05rem;
    font-weight: 600;
    font-variant-numeric: tabular-nums;
    color: var(--text-primary);
    line-height: 1.25;
}

.readout__value span {
    font-size: 0.78rem;
    font-weight: 400;
    color: var(--text-muted);
}

.verdict {
    margin-top: 1rem;
    padding: 0.8rem 1rem;
    border-radius: var(--radius-sm);
    font-size: 0.92rem;
    background: rgba(255, 255, 255, 0.05);
    border-left: 3px solid var(--accent-primary);
    color: var(--text-secondary);
}

.verdict strong {
    color: var(--text-primary);
}

.verdict--ok {
    border-left-color: var(--lvl-skolska);
}

.verdict--warn {
    border-left-color: var(--lvl-zupanijska);
}

.verdict--bad {
    border-left-color: var(--lvl-drzavna);
}

/* --- Tablice --- */
.data-table-wrap {
    overflow-x: auto;
    margin-top: 1rem;
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-md);
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.85rem;
    font-variant-numeric: tabular-nums;
}

.data-table--compact {
    font-size: 0.78rem;
}

.data-table--compact th,
.data-table--compact td {
    padding: 0.42rem 0.5rem;
}

.data-table th,
.data-table td {
    padding: 0.55rem 0.7rem;
    text-align: right;
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    white-space: nowrap;
}

.data-table th {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-secondary);
    font-weight: 600;
    font-size: 0.78rem;
    cursor: pointer;
    user-select: none;
    position: sticky;
    top: 0;
}

.data-table th:hover {
    color: var(--accent-primary);
}

.data-table th.sorted::after {
    content: ' ▾';
    color: var(--accent-primary);
}

.data-table th.sorted.asc::after {
    content: ' ▴';
}

.data-table td:first-child,
.data-table th:first-child {
    text-align: left;
    font-weight: 500;
    color: var(--text-primary);
}

.data-table tbody tr:hover {
    background: rgba(255, 255, 255, 0.04);
}

.data-table tr.is-giant td:first-child {
    color: var(--accent-secondary);
}

/* --- Prev / next --- */
.lesson-nav {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    justify-content: space-between;
    align-items: stretch;
    margin-top: 2.5rem;
}

.lesson-nav__link {
    flex: 1 1 240px;
    display: flex;
    flex-direction: column;
    gap: 0.2rem;
    padding: 1rem 1.25rem;
    background: var(--bg-glass);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-md);
    transition: var(--transition-fast);
    color: var(--text-primary);
}

.lesson-nav__link:hover {
    background: rgba(255, 255, 255, 0.09);
    border-color: var(--accent-primary);
    color: var(--text-primary);
}

.lesson-nav__link--next {
    text-align: right;
}

.lesson-nav__dir {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.lesson-nav__name {
    font-weight: 500;
    font-size: 0.95rem;
}

.lesson-nav__link--disabled {
    opacity: 0.35;
    pointer-events: none;
}

/* --- Legenda grafa --- */
.legend {
    display: flex;
    flex-wrap: wrap;
    gap: 0.9rem;
    margin-top: 0.75rem;
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.legend__item {
    display: flex;
    align-items: center;
    gap: 0.4rem;
}

.legend__swatch {
    width: 14px;
    height: 3px;
    border-radius: 2px;
    background: var(--sw, var(--accent-primary));
}

.legend__swatch--dot {
    width: 9px;
    height: 9px;
    border-radius: 50%;
}

/* --- Placeholder stranice --- */
.soon-box {
    text-align: center;
    padding: 3rem 2rem;
}

.soon-box__icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

/* --- Responzivno --- */
@media (max-width: 640px) {
    .header {
        padding: 0.5rem 1rem;
    }

    .header__subtitle {
        display: none;
    }

    .panel,
    .demo {
        padding: 1.15rem;
    }

    .lesson-head__actions {
        min-width: 100%;
    }

    .course-hero {
        padding-top: 6rem;
    }
}

@media print {

    .header,
    .nav,
    .nav-overlay,
    .lesson-nav,
    .footer {
        display: none;
    }

    body::before,
    body::after {
        display: none;
    }
}

/* =========================================
   Pristup: PIN vrata, urednički način
   ========================================= */

/* Dok PIN nije unesen, sadržaj se ne prikazuje.
   Klasu postavlja mali skript u <head> svake stranice, pa nema bljeska. */
html.tecaj-zakljucano body>main,
html.tecaj-zakljucano body>.header,
html.tecaj-zakljucano body>.footer,
html.tecaj-zakljucano body>.nav-overlay {
    display: none !important;
}

.pin-gate {
    position: fixed;
    inset: 0;
    z-index: 3000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem 1.25rem;
    background: rgba(6, 6, 12, 0.92);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    transition: opacity 0.3s ease;
}

.pin-gate--off {
    opacity: 0;
    pointer-events: none;
}

.pin-box {
    width: 100%;
    max-width: 420px;
    text-align: center;
    background: var(--bg-secondary);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-xl);
    padding: 2.5rem 2rem;
    box-shadow: var(--shadow-lg);
}

.pin-ikona {
    font-size: 2.4rem;
    margin-bottom: 0.75rem;
}

.pin-naslov {
    font-size: 1.7rem;
    margin-bottom: 0.75rem;
}

.pin-tekst {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: 1.5rem;
}

.pin-unos {
    width: 100%;
    margin-bottom: 0.75rem;
    text-align: center;
    font-size: 1.5rem;
    letter-spacing: 0.35em;
    padding: 0.8rem 0.6rem;
    font-variant-numeric: tabular-nums;
}

.pin-greska {
    min-height: 1.3em;
    margin-bottom: 0.75rem;
    font-size: 0.88rem;
    color: var(--lvl-drzavna);
}

.pin-alt {
    display: flex;
    gap: 0.5rem;
    justify-content: center;
    flex-wrap: wrap;
    margin-top: 1.25rem;
}

.pin-nota {
    margin-top: 1.25rem;
    font-size: 0.8rem;
    color: var(--text-muted);
}

@keyframes pinTrese {

    0%,
    100% {
        transform: translateX(0);
    }

    20% {
        transform: translateX(-7px);
    }

    40% {
        transform: translateX(7px);
    }

    60% {
        transform: translateX(-4px);
    }

    80% {
        transform: translateX(4px);
    }
}

.pin-trese {
    animation: pinTrese 0.32s ease;
}

/* --- Urednička ploča --- */
.urednik {
    border-color: rgba(251, 191, 36, 0.35);
    background:
        linear-gradient(rgba(251, 191, 36, 0.05), rgba(251, 191, 36, 0.05)),
        var(--bg-card);
}

.vid-popis {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 0.4rem;
}

.vid-red {
    display: flex;
    align-items: center;
    gap: 0.7rem;
    padding: 0.5rem 0.7rem;
    border-radius: var(--radius-sm);
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--border-glass);
    cursor: pointer;
    transition: var(--transition-fast);
}

.vid-red:hover {
    background: rgba(255, 255, 255, 0.08);
}

.vid-red--off {
    opacity: 0.5;
}

.vid-broj {
    flex: 0 0 1.6rem;
    text-align: right;
    font-size: 0.8rem;
    color: var(--text-muted);
    font-variant-numeric: tabular-nums;
}

.vid-ime {
    flex: 1;
    font-size: 0.85rem;
    line-height: 1.3;
}

/* Prekidač */
.prekidac {
    flex: 0 0 auto;
    position: relative;
    width: 38px;
    height: 21px;
    border-radius: 11px;
    background: rgba(255, 255, 255, 0.14);
    transition: var(--transition-fast);
}

.prekidac--on {
    background: var(--lvl-skolska);
}

.prekidac input {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    margin: 0;
    padding: 0;
    opacity: 0;
    cursor: pointer;
}

.prekidac__kvacica {
    position: absolute;
    top: 3px;
    left: 3px;
    width: 15px;
    height: 15px;
    border-radius: 50%;
    background: #fff;
    transition: var(--transition-fast);
    pointer-events: none;
}

.prekidac--on .prekidac__kvacica {
    transform: translateX(17px);
}

/* Oznaka na kartici skrivene lekcije */
.lesson-card {
    position: relative;
}

.lesson-card--skrivena {
    border-style: dashed;
    border-color: rgba(251, 191, 36, 0.45);
}

.card-znak {
    position: absolute;
    top: 0.7rem;
    right: 0.7rem;
    padding: 0.12rem 0.5rem;
    border-radius: 100px;
    font-size: 0.68rem;
    font-weight: 700;
    letter-spacing: 0.04em;
    background: var(--lvl-zupanijska);
    color: #08080c;
}

/* Diskretna traka koja podsjeća da je urednički način uključen */
body.urednik-aktivan .header {
    border-bottom-color: rgba(251, 191, 36, 0.45);
    box-shadow: inset 0 -2px 0 rgba(251, 191, 36, 0.45);
}

/* =========================================
   Modal za prijavu i obrasci
   (isti izgled kao prijava na glavnoj stranici)
   ========================================= */

.nav__login {
    margin-top: 1rem;
    width: 100%;
    justify-content: center;
}

.modal-overlay {
    position: fixed;
    inset: 0;
    /* Iznad PIN zaslona (3000), da „Prijava urednika“ s njega bude vidljiva */
    z-index: 3500;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem 1.25rem;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
    opacity: 0;
    visibility: hidden;
    transition: var(--transition-smooth);
}

.modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.modal {
    width: 100%;
    max-width: 430px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-xl);
    padding: 2.25rem 2rem;
    box-shadow: var(--shadow-lg);
    transform: scale(0.92);
    transition: var(--transition-smooth);
}

.modal-overlay.active .modal {
    transform: scale(1);
}

.modal__header {
    text-align: center;
    margin-bottom: 1.75rem;
}

.modal__title {
    font-size: 1.4rem;
    margin-bottom: 0.4rem;
}

.form-group {
    margin-bottom: 1rem;
}

.form-label {
    display: block;
    margin-bottom: 0.4rem;
    font-size: 0.88rem;
    color: var(--text-secondary);
}

.form-input {
    width: 100%;
    padding: 0.8rem 1rem;
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-family: inherit;
    font-size: 1rem;
    transition: var(--transition-fast);
}

.form-input:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px rgba(0, 212, 255, 0.12);
}

/* Poruka o stanju zapisa u uredničkoj ploči */
.vid-stanje {
    margin-top: 1rem;
    font-size: 0.88rem;
    color: var(--text-muted);
    min-height: 1.3em;
}

.vid-stanje--radi {
    color: var(--text-secondary);
}

.vid-stanje--ok {
    color: var(--lvl-skolska);
}

.vid-stanje--bad {
    color: var(--lvl-drzavna);
    padding: 0.6rem 0.8rem;
    border-radius: var(--radius-sm);
    background: rgba(244, 114, 182, 0.1);
    border: 1px solid rgba(244, 114, 182, 0.3);
}

/* Gumbi u heru naslovne: jedan pored drugog, u sredini, lome se na mobilnom */
.hero-akcije {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    justify-content: center;
}