/* ==========================================================================
   1. Pengaturan Dasar & Variabel Warna (Biru & Putih)
   ========================================================================== */
:root {
    --primary-color: #2563eb;      /* Biru Utama (Brand) */
    --primary-hover: #1d4ed8;      /* Biru Gelap saat Hover */
    --primary-light: #eff6ff;      /* Biru Sangat Muda untuk Background */
    --text-main: #1e293b;          /* Warna Teks Utama (Slate Gelap) */
    --text-muted: #64748b;         /* Warna Teks Sekunder (Slate Abu) */
    --bg-body: #f8fafc;            /* Warna Background Utama Website */
    --bg-white: #ffffff;           /* Putih Bersih */
    --border-color: #e2e8f0;       /* Warna Garis Pembatas */
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.05), 0 1px 2px rgba(0,0,0,0.02);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.05), 0 2px 4px -1px rgba(0,0,0,0.03);
    --radius-lg: 12px;
    --radius-xl: 16px;
    --transition: all 0.3s ease;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg-body);
    color: var(--text-main);
    line-height: 1.6;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

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

.iframe {
    max-width: 100%;
    height: auto;
}

/* Container Wrapper global */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}
.container-index {
    width: 100%;
    max-width: 1200px;
    height: 600px;
    margin: 0 auto;
    padding: 0 20px;
    padding-top: 160px;
}
.container-index h1{
    font-size: 2.5rem;
    color: var(--bg-white);
    text-shadow: 1px 1px 2px black;
    font-weight: 800;
    margin-bottom: 15px;
}

.container-index p{
    font-size: 2.5rem;
    color: var(--bg-white);
    text-shadow: 1px 1px 2px black;
    font-weight: 800;
    margin-bottom: 15px;
}

/* ==========================================================================
   2. Komponen Komon (Navbar & Footer)
   ========================================================================== */
/* Navbar */
.navbar {
    background-color: var(--bg-white);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 100;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.logo {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--primary-color);
    display: flex;
    align-items: center;
    gap: 10px;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 15px;
}

.nav-item {
    font-weight: 500;
    color: var(--text-muted);
    padding: 8px 12px;
}

.nav-item:hover, .nav-item.active {
    color: var(--primary-color);
}

.nav-item.active {
    border-bottom: 2px solid var(--primary-color);
}

/* Tombol Akses */
.btn-outline {
    border: 1px solid var(--primary-color);
    color: var(--primary-color);
    padding: 8px 18px;
    border-radius: 8px;
    font-weight: 600;
}

.btn-outline:hover {
    background-color: var(--primary-light);
}

.btn-primary {
    background-color: var(--primary-color);
    color: var(--bg-white);
    padding: 9px 18px;
    border-radius: 8px;
    font-weight: 600;
    box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
    background-color: var(--primary-hover);
}

/* Footer */
.footer {
    background-color: #0f172a; /* Slate Sangat Gelap */
    color: #cbd5e1;
    padding-top: 50px;
    margin-top: auto;
    border-top: 1px solid #1e293b;
}

.footer-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 40px;
    padding-bottom: 40px;
}

@media (min-width: 768px) {
    .footer-grid {
        grid-template-columns: 1fr 1fr;
    }
}

.footer-brand h3 {
    color: var(--bg-white);
    font-size: 1.3rem;
    margin-bottom: 15px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.footer-brand p {
    color: #94a3b8;
    margin-bottom: 15px;
    max-width: 350px;
}

.footer-info {
    font-size: 0.9rem;
}

.footer-info i {
    color: var(--primary-color);
    margin-right: 8px;
}

.footer-maps h3 {
    color: var(--bg-white);
    font-size: 1.1rem;
    margin-bottom: 15px;
}

.map-container {
    width: 100%;
    height: 150px;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: inset 0 2px 4px rgba(0,0,0,0.2);
}

.footer-bottom {
    border-top: 1px solid #1e293b;
    padding: 20px 0;
    text-align: center;
    font-size: 0.85rem;
    color: #64748b;
}

/* ==========================================================================
   3. Desain Halaman Utama (index.html)
   ========================================================================== */
/* Hero Section */
.hero {
    background-image: url("photo/Gedung-utama.jpg");
    background-position: 0 -180px;
    background-repeat: no-repeat;
    background-size: cover;
    color: var(--bg-white);
    padding: 0px 0;
    text-align: center;
}

.hero h1 {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 15px;
}

.hero p {
    font-size: 1.2rem;
    color: var(--primary-light);
    max-width: 700px;
    margin: 0 auto 35px auto;
    font-weight: 300;
}

.btn-hero {
    background-color: blue;
    color: white;
    padding: 14px 32px;
    border-radius: 50px;
    font-weight: 700;
    font-size: 1rem;
    box-shadow: var(--shadow-md);
    display: inline-block;
    border: none;
    transition: var(--transition);
}

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

/* Keunggulan Section */
.features {
    padding: 70px 0;
}

.section-title {
    text-align: center;
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 50px;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
}

.feature-card {
    background-color: var(--bg-white);
    padding: 30px;
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    text-align: center;
    box-shadow: var(--shadow-sm);
}

.feature-icon {
    width: 55px;
    height: 55px;
    background-color: var(--primary-light);
    color: var(--primary-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px auto;
    font-size: 1.4rem;
}

.feature-card h3 {
    font-size: 1.25rem;
    margin-bottom: 10px;
}

.feature-card p {
    color: var(--text-muted);
    font-size: 0.95rem;
}

/* ==========================================================================
   4. Desain Halaman Pilihan Materi (materi.html)
   ========================================================================== */
.page-header {
    background-color: var(--bg-white);
    border-bottom: 1px solid var(--border-color);
    padding: 40px 0;
}

.page-header h1 {
    font-size: 2rem;
    font-weight: 700;
}

.page-header p {
    color: var(--text-muted);
    margin-top: 5px;
}

.materi-section {
    padding: 50px 0;
}

.materi-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 25px;
}

.materi-card {
    background-color: var(--bg-white);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 25px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    box-shadow: var(--shadow-sm);
}

.materi-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.materi-badge-text {
    width: 45px;
    height: 45px;
    background-color: var(--primary-light);
    color: var(--primary-color);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1.1rem;
    margin-bottom: 15px;
}

.materi-badge-icon {
    width: 45px;
    height: 45px;
    background-color: var(--primary-light);
    color: var(--primary-color);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    margin-bottom: 15px;
}

.materi-card h3 {
    font-size: 1.15rem;
    color: var(--text-main);
    margin-bottom: 8px;
}

.materi-card p {
    color: var(--text-muted);
    font-size: 0.85rem;
    margin-bottom: 20px;
}

.btn-card-materi {
    width: 100%;
    background-color: var(--primary-light);
    color: var(--primary-color);
    border: none;
    padding: 10px 0;
    border-radius: 8px;
    font-weight: 600;
    font-size: 0.9rem;
    cursor: pointer;
    transition: var(--transition);
}

.btn-card-materi:hover {
    background-color: var(--primary-color);
    color: var(--bg-white);
}

/* Khusus Kartu Unggulan Koding & AI */
.materi-card.featured-card {
    border: 2px solid #93c5fd;
    background-image: linear-gradient(to bottom, #ffffff, #eff6ff);
    position: relative;
    overflow: hidden;
}

.featured-tag {
    position: absolute;
    top: 0;
    right: 0;
    background-color: var(--primary-color);
    color: var(--bg-white);
    font-size: 0.65rem;
    font-weight: 800;
    text-transform: uppercase;
    padding: 4px 12px;
    border-radius: 0 0 0 8px;
    letter-spacing: 0.5px;
}

.featured-card .materi-badge-icon {
    background-color: var(--primary-color);
    color: var(--bg-white);
    box-shadow: var(--shadow-sm);
}

.featured-card .btn-card-materi {
    background-color: var(--primary-color);
    color: var(--bg-white);
}

.featured-card .btn-card-materi:hover {
    background-color: var(--primary-hover);
}

/* ==========================================================================
   5. Desain Form Autentikasi (login.html & register.html)
   ========================================================================== */
.auth-body {
    background-color: var(--primary-light);
    justify-content: center;
    align-items: center;
    padding: 20px;
}

.auth-card {
    background-color: var(--bg-white);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    padding: 35px;
    width: 100%;
    max-width: 420px;
    border: 1px solid rgba(0,0,0,0.02);
}

.auth-header {
    text-align: center;
    margin-bottom: 30px;
}

.auth-header .logo {
    justify-content: center;
    font-size: 1.5rem;
    margin-bottom: 5px;
}

.auth-header p {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.form-group {
    margin-bottom: 20px;
}

.form-label-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 6px;
}

.form-label {
    font-size: 0.85rem;
    font-weight: 600;
    color: #475569;
    display: block;
    margin-bottom: 6px;
}

.form-link-action {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--primary-color);
}

.form-control {
    width: 100%;
    padding: 10px 14px;
    border: 1px solid #cbd5e1;
    border-radius: 10px;
    font-size: 0.9rem;
    outline: none;
    transition: var(--transition);
}

.form-control:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}

.form-checkbox-row {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 20px;
}

.form-checkbox-row input[type="checkbox"] {
    width: 15px;
    height: 15px;
    accent-color: var(--primary-color);
}

.form-checkbox-row label {
    font-size: 0.8rem;
    color: #475569;
    font-weight: 500;
    line-height: 1.3;
}

.btn-submit {
    width: 100%;
    background-color: var(--primary-color);
    color: var(--bg-white);
    border: none;
    padding: 12px;
    border-radius: 10px;
    font-weight: 600;
    font-size: 0.95rem;
    cursor: pointer;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.btn-submit:hover {
    background-color: var(--primary-hover);
}

.auth-footer {
    text-align: center;
    margin-top: 25px;
    padding-top: 20px;
    border-top: 1px solid var(--border-color);
    font-size: 0.85rem;
    color: var(--text-muted);
}

.auth-footer a {
    color: var(--primary-color);
    font-weight: 700;
}

.auth-footer a:hover {
    text-decoration: underline;
}