/* --- CSS VARIABLES & THEME --- */
:root {
    --bg-color: #f4f4f4;
    --text-main: #000000;
    --text-muted: #a1a1a1;
    --accent: #ff4f7b; /* Merah muda lembut */
    --header-bg: rgba(244, 244, 244, 0.85); /* Semi transparan light */
    --glass-border: rgba(0, 0, 0, 0.05);
}

/* Dark Mode Override */
body.dark-mode {
    --bg-color: #121212;
    --text-main: #ffffff;
    --text-muted: #888888;
    --accent: #ff375f;
    --header-bg: rgba(18, 18, 18, 0.85);
    --glass-border: rgba(255, 255, 255, 0.1);
}

/* --- RESET & BASE --- */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif; /* Font bersih professional */
}

body {
    background-color: var(--bg-color);
    color: var(--text-main);
    transition: background-color 0.3s ease, color 0.3s ease;
    overflow-x: hidden;
}

a {
    text-decoration: none;
    color: inherit;
    transition: color 0.3s ease;
}

/* --- HEADER --- */
header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 80px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 5%;
    z-index: 1000;
    background: transparent; /* Awal transparan */
    transition: background 0.3s ease;
}

/* Efek kaca saat discroll (opsional, script JS bisa menambahkan class 'scrolled') */
header.scrolled {
    background: var(--header-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--glass-border);
}

/* Brand - Kiri */
.brand {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text-main);
    letter-spacing: 1px;
    z-index: 1002;
}

/* Navigation - Tengah (Desktop) */
.nav-desktop {
    display: flex;
    gap: 30px;
}

.nav-link {
    font-size: 0.9rem;
    color: var(--text-muted); /* Abu-abu default */
    font-weight: 500;
    position: relative;
}

.nav-link:hover {
    color: var(--accent); /* Hover merah muda */
}

.nav-link.active {
    color: var(--accent); /* Aktif merah */
}

/* Controls - Kanan */
.controls {
    display: flex;
    align-items: center;
    gap: 20px;
    z-index: 1002;
}

.theme-toggle {
    background: none;
    border: none;
    cursor: pointer;
    font-size: 1.2rem;
    color: var(--text-muted);
    transition: transform 0.3s;
}

.theme-toggle:hover {
    color: var(--accent);
    transform: rotate(15deg);
}

.hamburger {
    display: none; /* Sembunyi di desktop */
    background: none;
    border: none;
    cursor: pointer;
    flex-direction: column;
    gap: 5px;
}

.hamburger span {
    display: block;
    width: 25px;
    height: 2px;
    background-color: var(--text-muted);
    transition: 0.3s;
}

/* --- SIDEBAR (MOBILE) --- */
.sidebar {
    position: fixed;
    top: 0;
    left: -100%; /* Sembunyi di kanan */
    width: 250px; /* Atau 100% untuk full screen menu */
    height: 100vh;
    background-color: var(--bg-color);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 2rem;
    transition: 0.4s ease-in-out;
    z-index: 1001;
    box-shadow: -5px 0 15px rgba(0,0,0,0.1);
}

.sidebar.active {
    left: -10px;
}

.sidebar a {
    font-size: 1.2rem;
    color: var(--text-muted);
}

.sidebar a.active, .sidebar a:hover {
    color: var(--accent);
}

/* --- PAGE CONTENT --- */
main {
    min-height: 100vh;
    width: 100%;
    /* Padding top dihapus agar hero section bisa di belakang header */
    display: flex;
    flex-direction: column;
}

.hero-section {
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: 0 20px;
    /* Gradient placeholder agar terlihat */
    background: linear-gradient(135deg, var(--bg-color) 0%, rgba(0,0,0,0.05) 100%); 
}

.hero-title {
    font-size: 3rem;
    font-weight: 300;
    color: var(--text-main);
    margin-bottom: 1rem;
}

.hero-subtitle {
    font-size: 1.1rem;
    color: var(--text-muted);
}

.content-section {
    padding: 100px 10%;
    background-color: var(--bg-color);
}

/* --- RESPONSIVE --- */
@media (max-width: 1024px) {
    .nav-desktop {
        display: none; /* Sembunyikan menu desktop */
    }
    
    .hamburger {
        display: flex; /* Tampilkan hamburger */
    }
}