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

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

/* --- MODERN NAVBAR WITH GLASSMORPHISM --- */
nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 8%;
    position: fixed; /* Membuat navbar melayang tetap di atas */
    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;
    transition: opacity 0.2s ease;
}

nav .brand-logo:hover {
    opacity: 0.85;
}

/* Logo Putih Solid Bersih */
nav h1 {
    font-weight: 600;
    letter-spacing: 1.5px;
    font-size: 26px;
    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); /* Sedikit redup saat tidak aktif */
    transition: color 0.3s ease;
    font-size: 15px;
    font-weight: 400;
    position: relative;
    padding: 5px 0;
}

/* Efek garis bawah animasi saat menu di-hover atau aktif */
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; /* Menyala biru cyan terang saat aktif */
}

/* Tombol Hamburger (Tersembunyi di Desktop) */
.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;
}

/* --- MAIN LAYOUT GRID --- */
main {
    flex: 1;
    width: 100%;
    max-width: 1140px;
    margin: 100px auto 0 auto; /* Margin top agar tidak tertutup navbar fixed */
    padding: 30px 6% 60px 6%;
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 30px;
    align-items: start;
}

/* Container Section Flat Transparan Premium */
section {
    background: rgba(255, 255, 255, 0.07);
    padding: 40px 30px;
    border-radius: 28px;
    border: 1px solid rgba(255, 255, 255, 0.05);
    transition: background 0.2s ease;
}

section:hover {
    background: rgba(255, 255, 255, 0.1);
}

h2 {
    font-weight: 600;
    margin-bottom: 12px;
    color: #ffffff;
    font-size: 26px;
    letter-spacing: 0.5px;
}

p {
    font-weight: 300;
    line-height: 1.6;
    margin-bottom: 25px;
    color: rgba(255, 255, 255, 0.8);
    font-size: 15px;
}

/* Form Controls */
.form-row-parallel {
    display: flex;
    gap: 20px;
}

.form-group {
    margin-bottom: 20px;
    flex: 1;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-size: 14px;
    font-weight: 500;
    color: rgba(255, 255, 255, 0.9);
}

/* Input Number Styling */
input[type="number"] {
    width: 100%;
    padding: 14px 18px;
    border-radius: 16px;
    border: 1px solid rgba(255, 255, 255, 0.15);
    background: rgba(0, 0, 0, 0.15);
    color: white;
    font-size: 16px;
    outline: none;
    transition: border-color 0.2s;
}

input[type="number"]:focus {
    border-color: #00bce4;
}

/* Gender Selector Custom */
.gender-card-group {
    display: flex;
    gap: 12px;
}

.gender-card-label {
    flex: 1;
    position: relative;
    cursor: pointer;
}

.gender-card-label input[type="radio"] {
    position: absolute;
    opacity: 0;
    width: 0;
    height: 0;
}

.gender-card-custom {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 13px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: 16px;
    font-size: 15px;
    color: rgba(255, 255, 255, 0.7);
    transition: all 0.2s ease;
}

.gender-card-label:hover .gender-card-custom {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.3);
    color: #ffffff;
}

.gender-card-label input[type="radio"]:checked + .gender-card-custom {
    background: #00bce4;
    border-color: #00bce4;
    color: #ffffff;
    font-weight: 500;
    box-shadow: 0 4px 12px rgba(0, 188, 228, 0.2);
}

.gender-card-custom::before {
    content: '';
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.4);
    transition: transform 0.2s, background 0.2s;
}

.gender-card-label input[type="radio"]:checked + .gender-card-custom::before {
    background: #ffffff;
    transform: scale(1.4);
}

/* Buttons Styling */
.btn-container {
    display: flex;
    gap: 15px;
    margin-top: 25px;
}

.navigation-container {
    margin-top: 15px;
    display: flex;
}

.btn {
    flex: 1;
    padding: 14px 24px;
    border: none;
    border-radius: 20px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease, transform 0.1s;
    font-size: 15px;
    display: inline-flex;
    justify-content: center;
    align-items: center;
    text-decoration: none;
}

.btn:active {
    transform: scale(0.98);
}

.btn-primary {
    background: #00bce4;
    color: white;
}

.btn-primary:hover {
    background: #00a8cc;
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.1);
    color: white;
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.15);
}

.btn-outline-dashboard {
    background: transparent;
    color: rgba(255, 255, 255, 0.7);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.btn-outline-dashboard:hover {
    background: rgba(255, 255, 255, 0.05);
    color: #ffffff;
    border-color: rgba(255, 255, 255, 0.5);
}

/* Result Area */
.result-box {
    background: rgba(255, 255, 255, 0.05);
    border-left: 5px solid rgba(255, 255, 255, 0.3);
    padding: 30px 25px;
    border-radius: 20px;
    margin-bottom: 25px;
    min-height: 125px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    text-align: center;
    transition: all 0.3s ease;
}

.result-bmi {
    font-size: 42px;
    font-weight: 600;
    color: #ffffff;
    line-height: 1.2;
}

.result-status {
    font-size: 18px;
    margin-top: 8px;
    font-weight: 500;
    color: rgba(255, 255, 255, 0.9);
}

/* Bar Status WHO */
.who-scale {
    margin-top: 25px;
}
.scale-title {
    font-size: 13px;
    color: rgba(255, 255, 255, 0.6);
    margin-bottom: 8px;
    font-weight: 400;
}
.scale-bar {
    display: flex;
    height: 8px;
    border-radius: 4px;
    overflow: hidden;
    background: rgba(255, 255, 255, 0.1);
    margin-bottom: 6px;
}
.bar-segment { flex: 1; }
.bg-under { background: #ffc107; }
.bg-ideal { background: #28a745; }
.bg-over { background: #fd7e14; }
.bg-obese { background: #dc3545; }

.scale-labels {
    display: flex;
    justify-content: space-between;
    font-size: 11px;
    color: rgba(255, 255, 255, 0.5);
}

/* Footer */
footer {
    text-align: center;
    padding: 30px 20px;
    color: rgba(255, 255, 255, 0.4);
    font-size: 13px;
    border-top: 1px solid rgba(255, 255, 255, 0.03);
    margin-top: 40px;
}

/* --- MEDIA QUERIES (RESPONSIVE) --- */
@media(max-width: 900px) {
    main {
        grid-template-columns: 1fr;
        gap: 25px;
        margin-top: 80px;
    }
    section {
        padding: 35px 25px;
    }
}

@media(max-width: 768px) {
    /* Konfigurasi Navbar di HP */
    nav { 
        padding: 15px 6%; 
    }

    .menu-toggle {
        display: flex; /* Memunculkan Hamburger Menu di HP */
    }

    /* Animasi Hamburger Menjadi Simbol X */
    .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);
    }

    /* Mengubah susunan menu horizontal menjadi Menu Slide-In Samping */
    nav .nav-links {
        position: fixed;
        top: 0;
        right: -100%; /* Sembunyi sebelum diklik */
        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);
        padding: 0;
    }

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

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

@media(max-width: 600px) {
    .form-row-parallel {
        flex-direction: column;
        gap: 0;
    }
    .gender-card-group {
        flex-direction: column;
        gap: 8px;
    }
    .btn-container {
        flex-direction: column;
        gap: 12px;
    }
    .navigation-container {
        margin-top: 12px;
    }
}