/* --- RESET & BASE STYLES --- */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Poppins', sans-serif;
}

body {
    background: linear-gradient(135deg, #1e3c72, #2a5298);
    color: white;
    min-height: 100vh;
    overflow-x: hidden;
}

/* --- MODERN NAVBAR WITH GLASSMORPHISM --- */
nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 8%;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: rgba(30, 60, 114, 0.3); 
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    transition: all 0.4s ease;
}

nav .brand-logo {
    text-decoration: none;
}

nav h1 {
    font-weight: 600;
    letter-spacing: 1.5px;
    color: #ffffff; 
}

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

nav .nav-links a {
    margin-left: 35px;
    text-decoration: none;
    color: rgba(255, 255, 255, 0.65);
    transition: color 0.3s ease;
    font-size: 15px;
    font-weight: 400;
    position: relative;
    padding: 5px 0;
}

nav .nav-links a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, #00f2fe, #4facfe);
    transition: width 0.3s ease;
}

nav .nav-links a:hover::after,
nav .nav-links a.active::after {
    width: 100%;
}

nav .nav-links a:hover,
nav .nav-links a.active {
    color: #00f2fe;
}

.menu-toggle {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 24px;
    height: 18px;
    background: transparent;
    border: none;
    cursor: pointer;
    z-index: 1001;
}

.menu-toggle .bar {
    height: 2px;
    width: 100%;
    background-color: white;
    border-radius: 5px;
    transition: all 0.3s ease;
}

/* --- HERO SECTION --- */
.hero {
    margin-top: 100px;
    text-align: center;
    padding: 60px 20px 30px 20px;
    animation: fadeIn 1.5s ease;
}

.hero h1 {
    font-size: 45px;
    background: linear-gradient(90deg, #fff, #00f2fe);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero p {
    margin: 10px 0 25px 0;
    opacity: 0.8;
}

.btn-back {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 12px 30px;
    border: 2px solid rgba(255, 255, 255, 0.2);
    border-radius: 25px;
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(5px);
    color: white;
    text-decoration: none;
    font-weight: 600;
    cursor: pointer;
    transition: 0.4s;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

.btn-back:hover {
    transform: translateX(-5px);
    background: linear-gradient(90deg, #00f2fe, #4facfe);
    border-color: transparent;
    box-shadow: 0 4px 20px rgba(0, 242, 254, 0.4);
}

/* --- VERTICAL STACK CONTAINER --- */
.showcase-stack {
    display: flex;
    flex-direction: column;
    gap: 80px; /* Jarak renggang vertikal yang pas untuk presentasi */
    max-width: 1000px;
    margin: 0 auto 120px auto;
    padding: 0 25px;
    position: relative;
    animation: fadeIn 2s ease;
}

/* Efek Glow menyebar di belakang susunan kartu */
.showcase-stack::before {
    content: '';
    position: absolute;
    top: 10%;
    left: 15%;
    width: 70%;
    height: 80%;
    background: linear-gradient(135deg, #00f2fe, #4facfe);
    filter: blur(160px);
    opacity: 0.15;
    z-index: -1;
    pointer-events: none;
}

/* Card Presentasi */
.showcase-card {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

/* Bagian Judul Slide & Nomor */
.card-header {
    display: flex;
    align-items: center;
    gap: 15px;
}

.slide-number {
    font-size: 24px;
    font-weight: 600;
    background: linear-gradient(90deg, #00f2fe, #4facfe);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.showcase-card h3 {
    font-size: 20px;
    font-weight: 400;
    letter-spacing: 0.5px;
    opacity: 0.9;
}

/* Wrapper Utama Bingkai PPT */
.canva-wrapper {
    position: relative;
    width: 100%;
    height: 0;
    padding-top: 56.25%; /* Rasio Aspek 16:9 */
    background: rgba(255, 255, 255, 0.03);
    backdrop-filter: blur(15px);
    border-radius: 24px;
    overflow: hidden;
    box-shadow: 0 30px 60px rgba(0, 0, 0, 0.4), 
                inset 0 1px 0 rgba(255, 255, 255, 0.2);
    transition: transform 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275), 
                box-shadow 0.5s ease;
}

/* Efek Interaktif (Hover Lift & Glow) */
.canva-wrapper:hover {
    transform: translateY(-10px) scale(1.01);
    box-shadow: 0 40px 80px rgba(0, 242, 254, 0.25), 
                0 20px 45px rgba(0, 0, 0, 0.5);
}

.canva-wrapper iframe {
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    border: none;
}

/* --- FOOTER --- */
    footer {
    text-align: center;
    padding: 30px;
    opacity: 0.7;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

/* --- ANIMATIONS --- */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(40px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* --- MEDIA QUERIES (RESPONSIVE HP) --- */
@media(max-width: 768px) {
    .hero h1 { 
        font-size: 32px; 
    }
    
    nav { 
        padding: 15px 6%; 
    }

    .menu-toggle {
        display: flex;
    }

    .menu-toggle.active .bar:nth-child(1) {
        transform: translateY(8px) rotate(45deg);
    }
    .menu-toggle.active .bar:nth-child(2) {
        opacity: 0;
    }
    .menu-toggle.active .bar:nth-child(3) {
        transform: translateY(-8px) rotate(-45deg);
    }

    nav .nav-links {
        position: fixed;
        top: 0;
        right: -100%;
        flex-direction: column;
        justify-content: center;
        align-items: center;
        width: 75%;
        height: 100vh;
        background: rgba(18, 38, 74, 0.96);
        backdrop-filter: blur(25px);
        -webkit-backdrop-filter: blur(25px);
        gap: 35px;
        transition: right 0.4s cubic-bezier(0.85, 0, 0.15, 1);
        box-shadow: -10px 0 30px rgba(0,0,0,0.3);
    }

    nav .nav-links.active {
        right: 0;
    }

    nav .nav-links a {
        margin-left: 0;
        font-size: 20px;
    }

    .showcase-stack {
        gap: 50px; /* Sedikit lebih rapat di mobile agar tidak terlalu lelah scroll */
        padding: 0 15px;
    }
    
    .canva-wrapper {
        border-radius: 16px;
    }
}