/* ==========================================================
   ALUMNI PORTAL ATVSS — style.css
   Inspirisano vrhunskim univerzitetima (Clean & Professional)
   Zvanične boje: Plava, Crna i Bela
   ========================================================== */

:root {
    --primary: #123a55;         /* Duboka akademska plava */
    --primary-light: #1a5276;   /* Srednja plava */
    --accent: #3498db;          /* Svetlija plava za akcente */
    --black: #111111;           /* Elegantna crna */
    --text: #333333;            /* Boja glavnog teksta */
    --text-light: #666666;      /* Svetliji tekst */
    --bg-light: #f8fafc;        /* Suptilna pozadina */
    --white: #ffffff;           
    --shadow: 0 10px 30px rgba(0, 0, 0, 0.06);
    --shadow-hover: 0 15px 35px rgba(18, 58, 85, 0.12);
    --radius: 8px;
    --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    color: var(--text);
    background-color: var(--white);
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

img {
    max-width: 100%;
    display: block;
}

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

/* ===== Navbar (Header) ===== */
.navbar {
    background: var(--white);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 85px;
}

.logo a {
    display: flex;
    align-items: center;
    gap: 14px;
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--black);
    letter-spacing: -0.5px;
}

.logo-icon-wrapper {
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-light);
    border: 1px solid #e2e8f0;
    border-radius: var(--radius);
    padding: 6px;
}

.logo img {
    height: 40px;
    width: auto;
    object-fit: contain;
}

.logo span {
    color: var(--accent);
    font-weight: 600;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 30px;
}

.nav-links a {
    color: var(--text);
    font-weight: 500;
    font-size: 1.05rem;
    padding: 6px 0;
    position: relative;
}

.nav-links a:not(.btn-primary)::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary);
    transition: var(--transition);
}

.nav-links a:not(.btn-primary):hover::after,
.nav-links a.active::after {
    width: 100%;
}

.nav-links a.active {
    color: var(--primary);
    font-weight: 600;
}

/* ===== Dugmad ===== */
.btn-primary {
    background: var(--primary);
    color: var(--white) !important;
    padding: 12px 26px !important;
    border-radius: var(--radius);
    font-weight: 600 !important;
    box-shadow: 0 4px 12px rgba(18, 58, 85, 0.2);
}

.btn-primary:hover {
    background: var(--primary-light);
    transform: translateY(-2px);
    box-shadow: 0 6px 15px rgba(18, 58, 85, 0.3);
}

.btn-large {
    display: inline-block;
    background: var(--white);
    color: var(--primary);
    padding: 16px 40px;
    border-radius: var(--radius);
    font-weight: 700;
    font-size: 1.15rem;
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.2);
}

.btn-large:hover {
    background: var(--bg-light);
    transform: translateY(-3px);
    box-shadow: 0 12px 30px rgba(0, 0, 0, 0.3);
}

/* ===== Hero Sekcija (Moćan akademski vizuelni utisak) ===== */
.hero {
    background: linear-gradient(135deg, var(--black) 0%, var(--primary) 100%);
    color: var(--white);
    padding: 130px 0;
    text-align: center;
}

.hero-content h1 {
    font-size: 3rem;
    margin-bottom: 20px;
    line-height: 1.15;
    font-weight: 800;
    letter-spacing: -0.5px;
}

.hero-content p {
    font-size: 1.2rem;
    max-width: 750px;
    margin: 0 auto 40px;
    opacity: 0.9;
    font-weight: 400;
}

/* ===== Zaglavlje podstranica ===== */
.page-header {
    background: linear-gradient(135deg, var(--black) 0%, var(--primary) 100%);
    color: var(--white);
    padding: 75px 0;
    text-align: center;
}

.page-header h1 {
    font-size: 2.5rem;
    margin-bottom: 12px;
    font-weight: 700;
}

.page-header p {
    font-size: 1.15rem;
    opacity: 0.85;
}

/* ===== Kartice / Sekcije (Glavni sadržaj) ===== */
.features {
    padding: 90px 0;
}

.features h2 {
    text-align: center;
    font-size: 2.2rem;
    color: var(--black);
    margin-bottom: 60px;
    font-weight: 700;
    position: relative;
}

.features h2::after {
    content: '';
    display: block;
    width: 60px;
    height: 4px;
    background: var(--accent);
    margin: 15px auto 0;
    border-radius: 2px;
}

.grid-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 35px;
}

.card {
    background: var(--white);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    border: 1px solid #edf2f7;
    transition: var(--transition);
    display: flex;
    flex-direction: column;
}

.card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-hover);
    border-color: var(--accent);
}

.card-image {
    height: 220px;
    overflow: hidden;
    background: var(--bg-light);
}

.card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.6s ease;
}

.card:hover .card-image img {
    transform: scale(1.06);
}

.card-body {
    padding: 30px;
    display: flex;
    flex-direction: column;
    flex-grow: 1;
}

.card-body h3 {
    color: var(--black);
    font-size: 1.4rem;
    margin-bottom: 14px;
    font-weight: 700;
}

.card-body p {
    color: var(--text-light);
    margin-bottom: 25px;
    flex-grow: 1;
    font-size: 1.02rem;
}

.card-link {
    color: var(--primary);
    font-weight: 600;
    font-size: 1.05rem;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.card-link:hover {
    color: var(--accent);
    gap: 10px;
}

/* ===== Tekstualne sekcije (O nama) ===== */
.text-section {
    padding: 70px 0;
    max-width: 900px;
}

.text-section h2 {
    color: var(--black);
    font-size: 2rem;
    margin: 35px 0 15px;
    font-weight: 700;
}

.text-section h2:first-child {
    margin-top: 0;
}

.text-section p {
    color: var(--text-light);
    margin-bottom: 20px;
    font-size: 1.1rem;
}

/* ===== Forma za prijavu ===== */
.login-section {
    padding: 90px 20px;
    display: flex;
    justify-content: center;
    background: var(--bg-light);
}

.login-card {
    background: var(--white);
    padding: 45px;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    border-top: 5px solid var(--primary);
    width: 100%;
    max-width: 450px;
}

.login-card h2 {
    color: var(--black);
    text-align: center;
    margin-bottom: 30px;
    font-size: 1.8rem;
    font-weight: 700;
}

.form-group {
    margin-bottom: 22px;
}

.form-group label {
    display: block;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text);
}

.form-group input {
    width: 100%;
    padding: 14px 16px;
    border: 2px solid #e2e8f0;
    border-radius: var(--radius);
    font-size: 1rem;
    transition: var(--transition);
}

.form-group input:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 4px rgba(52, 152, 219, 0.15);
}

.btn-submit {
    width: 100%;
    background: var(--primary);
    color: var(--white);
    padding: 15px;
    border: none;
    border-radius: var(--radius);
    font-size: 1.1rem;
    font-weight: 700;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: 0 4px 12px rgba(18, 58, 85, 0.2);
}

.btn-submit:hover {
    background: var(--primary-light);
    transform: translateY(-2px);
}

/* ===== Footer ===== */
.footer {
    background: var(--black);
    color: #a0aec0;
    padding: 40px 0;
    text-align: center;
    font-size: 0.95rem;
    border-top: 4px solid var(--primary);
}

.footer a {
    color: var(--white);
    text-decoration: underline;
}

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

/* ===== Responzivnost ===== */
@media (max-width: 768px) {
    .nav-container {
        flex-direction: column;
        height: auto;
        padding: 20px 0;
        gap: 15px;
    }

    .nav-links {
        flex-wrap: wrap;
        justify-content: center;
        gap: 20px;
    }

    .hero {
        padding: 80px 0;
    }

    .hero-content h1 {
        font-size: 2.2rem;
    }

    .hero-content p {
        font-size: 1.05rem;
    }

    .features {
        padding: 60px 0;
    }

    .grid-cards {
        grid-template-columns: 1fr;
    }
}