/* ==========================================
   CSS Variables & Theme Setup
   ========================================== */
:root,
[data-theme="dark"] {
    --primary-color: #3b82f6;
    --primary-hover: #2563eb;
    --bg-dark: #0f172a;
    --card-bg: #1e293b;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --border-color: rgba(255, 255, 255, 0.08);
    --input-bg: #0f172a;
    --accent-bg: rgba(59, 130, 246, 0.15);
    --alert-danger-bg: rgba(239, 68, 68, 0.2);
    --alert-danger-text: #f87171;
    --alert-success-bg: rgba(34, 197, 94, 0.2);
    --alert-success-text: #4ade80;
    --btn-theme-bg: #334155;
    --btn-theme-text: #f8fafc;
}

[data-theme="light"] {
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --bg-dark: #f8fafc;
    --card-bg: #ffffff;
    --text-main: #0f172a;
    --text-muted: #64748b;
    --border-color: #e2e8f0;
    --input-bg: #ffffff;
    --accent-bg: rgba(37, 99, 235, 0.08);
    --alert-danger-bg: #fee2e2;
    --alert-danger-text: #dc2626;
    --alert-success-bg: #dcfce7;
    --alert-success-text: #16a34a;
    --btn-theme-bg: #e2e8f0;
    --btn-theme-text: #0f172a;
}

/* Balik warna logo PNG jika dalam mode terang */
[data-theme="light"] .brand-logo img {
    filter: invert(1) brightness(0.2);
}

/* ==========================================
   Base Layout
   ========================================== */
body {
    margin: 0;
    padding: 0;
    font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background-color: var(--bg-dark);
    color: var(--text-main);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    line-height: 1.6;
    transition: background-color 0.3s ease, color 0.3s ease;
}

a {
    text-decoration: none;
}

/* ==========================================
   Navbar
   ========================================== */
.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 18px 8%;
    background: var(--card-bg);
    backdrop-filter: blur(10px);
    position: sticky;
    top: 0;
    z-index: 100;
    border-bottom: 1px solid var(--border-color);
}

.brand-logo {
    font-size: 1.4rem;
    font-weight: 800;
    color: var(--text-main);
    display: flex;
    align-items: center;
    gap: 8px;
    letter-spacing: -0.5px;
}

.brand-logo i {
    color: var(--primary-color);
}

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

.nav-links a {
    color: var(--text-muted);
    font-weight: 600;
    font-size: 0.95rem;
    padding: 8px 16px;
    border-radius: 8px;
    transition: color 0.2s;
}

.nav-links a:hover {
    color: var(--text-main);
}

.nav-links a.active {
    color: var(--primary-color);
    font-weight: 700;
    border-bottom: 2px solid var(--primary-color);
}

.nav-links .btn-nav {
    background-color: var(--primary-color);
    color: #ffffff;
    transition: background-color 0.2s;
}

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

.theme-toggle-btn {
    background-color: var(--btn-theme-bg);
    color: var(--btn-theme-text);
    border: 1px solid var(--border-color);
    padding: 8px 12px;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
    font-size: 0.85rem;
    display: flex;
    align-items: center;
    gap: 6px;
}

/* ==========================================
   Hero Section
   ========================================== */
.hero {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    padding: 80px 20px 60px 20px;
    max-width: 800px;
    margin: 0 auto;
}

.badge-hero,
.badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: var(--accent-bg);
    color: var(--primary-color);
    padding: 6px 16px;
    border-radius: 50px;
    font-size: 0.85rem;
    font-weight: 700;
    margin-bottom: 20px;
    border: 1px solid var(--border-color);
}

.hero h1 {
    font-size: 2.8rem;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 20px;
    letter-spacing: -0.5px;
}

.hero p {
    font-size: 1.15rem;
    color: var(--text-muted);
    line-height: 1.6;
    margin-bottom: 35px;
}

.cta-group {
    display: flex;
    gap: 15px;
    flex-wrap: wrap;
    justify-content: center;
}

.btn-cta-primary {
    background-color: var(--primary-color);
    color: #ffffff;
    padding: 12px 28px;
    font-size: 1rem;
    font-weight: 700;
    border-radius: 10px;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    box-shadow: 0 10px 25px -5px rgba(59, 130, 246, 0.4);
    transition: all 0.2s ease;
}

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

.btn-cta-secondary {
    background-color: var(--card-bg);
    color: var(--text-main);
    padding: 12px 28px;
    font-size: 1rem;
    font-weight: 700;
    border-radius: 10px;
    border: 1px solid var(--border-color);
    display: inline-flex;
    align-items: center;
    gap: 8px;
    transition: all 0.2s ease;
}

.btn-cta-secondary:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
    transform: translateY(-2px);
}

/* ==========================================
   Features Section
   ========================================== */
.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 25px;
    max-width: 1100px;
    margin: 40px auto 80px auto;
    padding: 0 20px;
    width: 100%;
    box-sizing: border-box;
}

.feature-card {
    background-color: var(--card-bg);
    padding: 30px;
    border-radius: 16px;
    border: 1px solid var(--border-color);
    transition: transform 0.2s ease, border-color 0.2s ease;
}

.feature-card:hover {
    transform: translateY(-4px);
    border-color: var(--primary-color);
}

.feature-icon {
    width: 50px;
    height: 50px;
    background: var(--accent-bg);
    color: var(--primary-color);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    margin-bottom: 20px;
}

.feature-card h3 {
    font-size: 1.2rem;
    margin-bottom: 10px;
    font-weight: 700;
    color: var(--text-main);
}

.feature-card p {
    font-size: 0.95rem;
    color: var(--text-muted);
    line-height: 1.5;
    margin: 0;
}

.feature-card code {
    background: var(--accent-bg);
    color: var(--primary-color);
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 0.85rem;
}

/* ==========================================
   Auth Pages (Login & Register)
   ========================================== */
.auth-wrapper {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 20px;
    box-sizing: border-box;
}

.auth-card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 30px;
    width: 100%;
    max-width: 400px;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
    position: relative;
    transition: background-color 0.3s ease, border-color 0.3s ease;
}

.auth-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 25px;
}

.auth-header h2 {
    margin: 0;
    font-size: 1.5rem;
}

.form-group {
    margin-bottom: 18px;
}

.form-group label {
    display: block;
    margin-bottom: 6px;
    font-size: 0.9rem;
    color: var(--text-muted);
}

.form-group input {
    width: 100%;
    padding: 10px 12px;
    background: var(--input-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-main);
    font-size: 0.95rem;
    box-sizing: border-box;
    outline: none;
    transition: border-color 0.2s ease;
}

.form-group input:focus {
    border-color: var(--primary-color);
}

.btn-primary {
    width: 100%;
    background-color: var(--primary-color);
    color: #ffffff;
    border: none;
    padding: 12px;
    border-radius: 8px;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: background-color 0.2s ease;
}

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

.alert {
    padding: 10px 14px;
    border-radius: 8px;
    font-size: 0.85rem;
    margin-bottom: 20px;
}

.alert-danger {
    background-color: var(--alert-danger-bg);
    color: var(--alert-danger-text);
}

.alert-success {
    background-color: var(--alert-success-bg);
    color: var(--alert-success-text);
}

.auth-footer {
    margin-top: 20px;
    text-align: center;
    font-size: 0.9rem;
    color: var(--text-muted);
}

.auth-footer a {
    color: var(--primary-color);
    font-weight: 600;
}

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

/* ==========================================
   Footer
   ========================================== */
.main-footer {
    text-align: center;
    padding: 20px 10px;
    border-top: 1px solid var(--border-color);
    color: var(--text-muted);
    font-size: 0.9rem;
    background: var(--card-bg);
}

.main-footer a {
    color: var(--text-main);
    font-weight: 600;
}

.main-footer span {
    color: var(--primary-color);
    margin: 0px;
}

/* ==========================================
   Responsive Breakpoints
   ========================================== */
@media (max-width: 600px) {
    .hero h1 {
        font-size: 2rem;
    }

    .hero p {
        font-size: 1rem;
    }

    .navbar {
        padding: 15px 5%;
    }
}