/* File: style.css (Versi Desain Fisika/Luar Angkasa Final) */

/* --- Variabel Warna & Font --- */
:root {
    --bg-dark: #0F0F23; /* Biru malam/ungu gelap */
    --card-bg: rgba(27, 27, 58, 0.6); /* Kaca buram ungu transparan */
    --primary-accent: #4D76FD; /* Biru elektrik terang */
    --secondary-accent: #00F5D4; /* Teal/Cyan neon */
    --text-color: #EAEAEA; /* Putih pudar agar nyaman dibaca */
    --border-color: rgba(77, 118, 253, 0.3);

    --font-heading: 'Rajdhani', sans-serif;
    --font-body: 'Poppins', sans-serif;
}

/* --- Reset & Gaya Global --- */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: var(--font-body);
    background-color: var(--bg-dark);
    color: var(--text-color);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
}

h1, h2 {
    font-family: var(--font-heading);
    color: white;
    text-align: center;
    text-transform: uppercase;
    letter-spacing: 2px;
}

/* --- Latar Belakang Bintang Bergerak (CSS Murni!) --- */
@keyframes move-stars {
    from { transform: translateY(0px); }
    to { transform: translateY(-2000px); }
}

.stars-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
}

.stars, .twinkling {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    width: 100%;
    height: 100%;
    display: block;
}

.stars {
    background: #000 url(https://www.script-tutorials.com/demos/360/images/stars.png) repeat top center;
    z-index: 0;
}

.twinkling {
    background: transparent url(https://www.script-tutorials.com/demos/360/images/twinkling.png) repeat top center;
    z-index: 1;
    animation: move-stars 200s linear infinite;
}

/* --- Struktur Utama --- */
.page-container {
    padding: 2rem;
    width: 100%;
    max-width: 1400px;
    height: 100vh;
    overflow-y: auto;
}

/* --- Kartu untuk Login & Register --- */
.auth-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.auth-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 2.5rem;
    width: 100%;
    max-width: 400px;
    backdrop-filter: blur(10px);
    box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
}

.auth-card h2 {
    margin-bottom: 2rem;
    color: var(--secondary-accent);
}

/* --- Form Input & Tombol --- */
.input-group {
    margin-bottom: 1.5rem;
}

label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    font-size: 0.9rem;
}

input[type="text"], input[type="password"], input[type="number"] {
    width: 100%;
    padding: 0.75rem;
    background-color: rgba(0, 0, 0, 0.2);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-color);
    font-family: var(--font-body);
    font-size: 1rem;
    transition: all 0.3s ease;
}

input:focus {
    outline: none;
    border-color: var(--primary-accent);
    box-shadow: 0 0 15px rgba(77, 118, 253, 0.5);
}

button {
    width: 100%;
    padding: 0.8rem;
    background: linear-gradient(45deg, var(--primary-accent), #3658c9);
    color: white;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-family: var(--font-heading);
    font-size: 1.2rem;
    font-weight: 700;
    letter-spacing: 1px;
    transition: all 0.3s ease;
    box-shadow: 0 0 20px rgba(77, 118, 253, 0.4);
}

button:hover {
    transform: translateY(-3px);
    box-shadow: 0 0 30px rgba(77, 118, 253, 0.7);
}

.auth-card p {
    text-align: center;
    margin-top: 1.5rem;
}

.auth-card a {
    color: var(--secondary-accent);
    font-weight: 600;
    text-decoration: none;
}

/* --- Gaya untuk Tombol Google Login --- */
.divider {
    display: flex;
    align-items: center;
    text-align: center;
    margin: 1.5rem 0;
}

.divider::before,
.divider::after {
    content: '';
    flex: 1;
    border-bottom: 1px solid rgba(255, 255, 255, 0.2);
}

.divider span {
    padding: 0 1rem;
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.9rem;
    text-transform: uppercase;
}

.google-btn {
    width: 100%;
    padding: 0.8rem 1rem;
    background: #ffffff;
    color: #333333;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-family: var(--font-body);
    font-size: 1rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    transition: all 0.3s ease;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
    margin-bottom: 1rem;
}

.google-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
    background: #f5f5f5;
}

.google-btn:active {
    transform: translateY(0);
}

.google-icon {
    width: 20px;
    height: 20px;
}

/* --- Gaya untuk Halaman index.html --- */
.main-lab-header {
    text-align: center;
    margin-bottom: 2rem;
}

#userInfo {
    background-color: var(--card-bg);
    padding: 1rem;
    border-radius: 12px;
    margin-bottom: 2rem;
    border: 1px solid var(--border-color);
}

#userInfo p {
    display: inline;
    margin-right: 1rem;
}

.nav-buttons {
    display: flex;
    gap: 1rem;
    align-items: center;
    justify-content: center;
    margin-top: 1rem;
}

.nav-link-btn {
    background: linear-gradient(135deg, var(--primary-accent), var(--secondary-accent));
    color: white;
    text-decoration: none;
    padding: 0.7rem 1.2rem;
    border-radius: 8px;
    font-weight: 600;
    font-size: 0.9rem;
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
    text-align: center;
    min-width: 100px;
}

.nav-link-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(77, 118, 253, 0.4);
    text-decoration: none;
    color: white;
}

#logoutButton {
    width: auto;
    padding: 0.7rem 1.2rem;
    font-size: 0.9rem;
    background: rgba(255, 68, 68, 0.8);
    border: none;
    color: white;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.lab-layout {
    display: flex;
    gap: 1.5rem;
    align-items: flex-start;
    flex-wrap: wrap;
}

.lab-card {
    flex: 1;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 1.5rem;
    backdrop-filter: blur(10px);
    min-width: 280px;
}

.simulation-area {
    flex: 2.5; /* Membuat kanvas lebih lebar */
    padding: 0;
    background: none;
    backdrop-filter: none;
    min-width: 400px;
}

#simulationCanvas {
    border-radius: 12px;
    width: 100%;
    height: auto;
    background-image: 
        linear-gradient(rgba(77, 118, 253, 0.1) 1px, transparent 1px),
        linear-gradient(90deg, rgba(77, 118, 253, 0.1) 1px, transparent 1px);
    background-size: 20px 20px;
    border: 1px solid var(--border-color);
}

.results p, .history li {
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--border-color);
}
.history li:last-child {
    border: none;
}

.history ul {
    list-style: none;
    max-height: 200px;
    overflow-y: auto;
}

/* --- Gaya untuk Fitur Hapus --- */
.history-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.delete-all-btn {
    background: #c0392b; /* Merah */
    font-size: 0.8rem;
    padding: 0.4rem 0.8rem;
    width: auto;
    box-shadow: 0 0 15px rgba(231, 76, 60, 0.4);
}
.delete-all-btn:hover {
    background: #e74c3c;
    box-shadow: 0 0 20px rgba(231, 76, 60, 0.7);
}

.history li {
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: background-color 0.3s;
}

.delete-item-btn {
    background: none;
    border: none;
    color: #e74c3c;
    cursor: pointer;
    font-size: 1.2rem;
    padding: 0.5rem;
    opacity: 0.5;
    transition: opacity 0.3s;
}

.history li:hover .delete-item-btn {
    opacity: 1;
}

/* --- Animasi & Transisi Desain --- */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.lab-card {
    animation: fadeInUp 0.5s ease-out forwards;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.lab-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 32px 0 rgba(77, 118, 253, 0.3);
}