/* --- ROOT VARIABLES --- */
:root {
    --bg-main: #0f0f0f;
    --bg-card: #212121;
    --bg-hover: #3d3d3d;
    --yt-red: #ff0000;
    --yt-red-hover: #cc0000;
    --text-main: #ffffff;
    --text-muted: #aaaaaa;
    --border-color: #333333;
    --transition-speed: 0.3s;
}

/* --- RESET & GLOBAL --- */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
}

body {
    background-color: var(--bg-main);
    color: var(--text-main);
    line-height: 1.6;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

a {
    text-decoration: none;
    color: var(--text-main);
    transition: color var(--transition-speed);
}

a:hover {
    color: var(--yt-red);
}

/* --- HEADER & NAVIGATION --- */
header {
    background-color: var(--bg-main);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-main);
}

.logo span {
    color: var(--yt-red);
}

.nav-links {
    display: flex;
    gap: 2rem;
}

.nav-links a {
    font-weight: 500;
}

/* Hamburger Menu */
.hamburger {
    display: none;
    cursor: pointer;
    background: none;
    border: none;
}

.hamburger .line {
    width: 25px;
    height: 3px;
    background-color: var(--text-main);
    margin: 5px 0;
    transition: var(--transition-speed);
}

/* --- MAIN CONTENT --- */
main {
    flex: 1;
    max-width: 1000px;
    margin: 0 auto;
    padding: 3rem 2rem;
    width: 100%;
}

.hero-section {
    text-align: center;
    margin-bottom: 3rem;
}

.hero-section h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.hero-section p {
    color: var(--text-muted);
    margin-bottom: 2rem;
}

/* Input Group */
.input-group {
    display: flex;
    max-width: 700px;
    margin: 0 auto;
    gap: 10px;
}

.input-group input {
    flex: 1;
    padding: 1rem 1.5rem;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    background-color: var(--bg-card);
    color: var(--text-main);
    font-size: 1rem;
    outline: none;
    transition: border-color var(--transition-speed);
}

.input-group input:focus {
    border-color: var(--yt-red);
}

.btn-generate {
    padding: 1rem 2rem;
    border-radius: 8px;
    border: none;
    background-color: var(--yt-red);
    color: #fff;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background-color var(--transition-speed);
}

.btn-generate:hover {
    background-color: var(--yt-red-hover);
}

.btn-generate:disabled {
    background-color: #555;
    cursor: not-allowed;
}

/* --- LOADING & RESULTS --- */
.loading {
    display: none;
    text-align: center;
    margin: 2rem 0;
    color: var(--text-muted);
}

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid var(--border-color);
    border-top: 4px solid var(--yt-red);
    border-radius: 50%;
    margin: 0 auto 10px auto;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.result-container {
    margin-top: 2rem;
    display: none; /* Muncul lewat JS */
}

.media-info {
    display: flex;
    gap: 1.5rem;
    background-color: var(--bg-card);
    padding: 1.5rem;
    border-radius: 8px;
    margin-bottom: 2rem;
    align-items: center;
}

.media-info img {
    max-width: 200px;
    border-radius: 8px;
}

.media-details h3 {
    margin-bottom: 0.5rem;
}

.download-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
}

.download-card {
    background-color: var(--bg-card);
    padding: 1.5rem;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.format-info p {
    font-weight: 600;
    margin-bottom: 0.2rem;
}

.format-info span {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.btn-download {
    padding: 0.6rem 1.2rem;
    background-color: var(--yt-red);
    color: white;
    border-radius: 6px;
    font-size: 0.9rem;
}

/* --- FOOTER --- */
footer {
    background-color: var(--bg-main);
    border-top: 1px solid var(--border-color);
    text-align: center;
    padding: 2rem;
    margin-top: auto;
}

footer p {
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* --- RESPONSIVE DESIGN --- */
@media screen and (max-width: 768px) {
    .nav-links {
        display: none;
        flex-direction: column;
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background-color: var(--bg-card);
        padding: 1rem 0;
        border-bottom: 1px solid var(--border-color);
        text-align: center;
    }

    .nav-links.active {
        display: flex;
    }

    .hamburger {
        display: block;
    }

    .input-group {
        flex-direction: column;
    }

    .btn-generate {
        width: 100%;
    }

    .media-info {
        flex-direction: column;
        text-align: center;
    }

    .media-info img {
        max-width: 100%;
    }
}