:root {
    --bg-color: #0A192F;
    /* Biru Malam */
    --card-color: #112240;
    /* Biru Malam lebih terang */
    --text-light: #CCD6F6;
    /* Abu-abu kebiruan */
    --text-white: #E6F1FF;
    /* Putih kebiruan */
    --text-dark: #8892B0;
    /* Abu-abu gelap */
    --accent-color: #64FFDA;
    /* Hijau Toska */
    --border-color: rgba(100, 255, 218, 0.1);
    --mouse-x: -100px;
    --mouse-y: -100px;
}

/* ===== Sembunyikan Kursor Asli & Pointer Kustom ===== */
* {
    cursor: none;
}

body {
    background-color: var(--bg-color);
    color: var(--text-light);
    font-family: 'Inter', sans-serif;
    margin: 0;
    font-size: 16px;
    line-height: 1.6;
    background-image: radial-gradient(circle 400px at var(--mouse-x) var(--mouse-y), rgba(100, 255, 218, 0.05), transparent 80%);
    background-repeat: no-repeat;
}

.custom-cursor {
    width: 30px;
    height: 30px;
    border: 2px solid white;
    border-radius: 50%;
    position: fixed;
    transform: translate(-50%, -50%);
    pointer-events: none;
    transition: all 0.1s ease-out;
    z-index: 9999;
}

.custom-cursor.hover {
    transform: translate(-50%, -50%) scale(1.5);
    background-color: var(--accent-color);
    opacity: 0.5;
}

.custom-cursor.click {
    transform: translate(-50%, -50%) scale(0.8);
}

/* ===== Efek Gelombang Klik ===== */
.ripple {
    position: absolute;
    border-radius: 50%;
    transform: scale(0);
    animation: ripple-effect 0.6s linear;
    border: 2px solid white;
    pointer-events: none;
    z-index: 9998;
}

@keyframes ripple-effect {
    to {
        transform: scale(4);
        opacity: 0;
    }
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    gap: 40px;
    padding: 0 20px;
}

/* ==== Sidebar Kiri (Sticky) ==== */
.left-sidebar {
    width: 40%;
    position: sticky;
    top: 0;
    height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    padding: 25px 0;
    box-sizing: border-box;
}

.profile-intro {
    flex-grow: 1;
}

.profile-pic {
    width: 180px;
    height: 180px;
    border-radius: 50%;
    object-fit: cover;
    border: 3px solid var(--accent-color);
    margin-bottom: 20px;
}

.left-sidebar h1 {
    font-size: 2.7em;
    color: var(--text-white);
    margin: 0;
}

.left-sidebar h2 {
    font-size: 1.3em;
    font-weight: 500;
    color: var(--text-dark);
    margin: 5px 0 20px 0;
}

.profile-summary {
    font-size: 1em;
    max-width: 400px;
}

.section-nav ul {
    list-style: none;
    padding: 0;
    margin: 40px 0;
}

.section-nav li a {
    display: flex;
    align-items: center;
    gap: 15px;
    padding: 10px 0;
    text-decoration: none;
    color: var(--text-dark);
    font-weight: 600;
    transition: all 0.2s ease-in-out;
}

.section-nav .line {
    width: 30px;
    height: 1px;
    background-color: var(--text-dark);
    transition: all 0.2s ease-in-out;
}

.section-nav a:hover .line {
    width: 60px;
    background-color: var(--text-white);
}

.section-nav a:hover .text {
    color: var(--text-white);
}

.contact-links {
    display: flex;
    gap: 20px;
}

.contact-links a {
    font-size: 1.8em;
    color: var(--text-dark);
    transition: all 0.2s ease-in-out;
}

.contact-links a:hover {
    color: var(--accent-color);
    transform: translateY(-3px);
}

/* ==== Konten Utama (Kanan) ==== */
.main-content {
    width: 60%;
    padding: 60px 0;
}

section {
    margin-bottom: 40px;
    scroll-margin-top: 60px;
}

.main-content h3 {
    font-size: 1.5em;
    color: var(--text-white);
    margin: 0 0 25px 0;
    display: flex;
    align-items: center;
    gap: 15px;
}

.main-content h3::after {
    content: '';
    flex-grow: 1;
    height: 1px;
    background-color: #1E3A5F;
}

.card {
    background-color: var(--card-color);
    padding: 20px;
    border-radius: 6px;
    margin-bottom: 20px;
    border: 1px solid transparent;
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.5s ease-out, transform 0.5s ease-out, border 0.2s ease-in-out, box-shadow 0.2s ease-in-out;
}

.card.visible {
    opacity: 1;
    transform: translateY(0);
}

.card:hover {
    border: 1px solid var(--border-color);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
}

.card-header h4 {
    font-size: 1.2em;
    margin: 0;
    color: var(--text-white);
}

.card-header span {
    font-size: 0.9em;
    color: var(--text-dark);
}

.card-subtitle {
    font-weight: 500;
    color: var(--text-dark);
    margin: 2px 0 10px 0;
}

.main-content ul {
    list-style: none;
    padding: 0;
    margin: 10px 0 0 0;
    font-size: 14px;
}

.main-content ul li {
    position: relative;
    padding-left: 20px;
    margin-bottom: 5px;
}

.main-content ul li::before {
    content: '▹';
    color: var(--accent-color);
    position: absolute;
    left: 0;
}

.thesis-title,
.card-description {
    margin-top: 10px;
    font-size: 0.9em;
    color: var(--text-dark);
}

.skills-list {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 10px;
}

.skills-list span {
    background-color: rgba(100, 255, 218, 0.1);
    color: var(--accent-color);
    padding: 5px 12px;
    border-radius: 15px;
    font-size: 0.85em;
    font-weight: 500;
}

/* Responsive */
@media (max-width: 1024px) {
    .container {
        flex-direction: column;
        padding: 0;
    }

    .left-sidebar {
        position: static;
        height: auto;
        width: 100%;
        padding: 30px 20px;
        box-sizing: border-box;
        text-align: center;
    }

    .section-nav {
        display: none;
    }

    .contact-links {
        justify-content: center;
    }

    .main-content {
        width: 100%;
        padding: 0 20px 40px 20px;
        box-sizing: border-box;
    }

    .main-content h3 {
        display: block;
        text-align: center;
    }

    .main-content h3::after {
        display: none;
    }

    .custom-cursor {
        display: none;
    }

    * {
        cursor: auto;
    }
}