:root {
    --apple-blue: #007AFF;
    --apple-green: #34C759;
    --apple-red: #FF3B30;
    --apple-gray: #8E8E93;
    --apple-light-gray: #F2F2F7;
    --apple-dark: #1C1C1E;
    --apple-text: #000000;
    --apple-secondary-text: #6C6C70;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Helvetica Neue", Arial, sans-serif;
    line-height: 1.6;
    color: var(--apple-text);
    background-color: var(--apple-light-gray);
}

.container {
    max-width: 1000px;
    margin: 2rem auto;
    padding: 2rem;
    background-color: #fff;
    border-radius: 20px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

h1 {
    text-align: center;
    margin-bottom: 0.5rem;
    color: var(--apple-dark);
    font-size: 3rem;
    font-weight: 700;
    letter-spacing: -0.5px;
}

.subtitle {
    text-align: center;
    color: var(--apple-secondary-text);
    margin-bottom: 2rem;
    font-size: 1.25rem;
    font-weight: 400;
}

section {
    margin-bottom: 3rem;
}

h2 {
    color: var(--apple-dark);
    font-size: 1.75rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    letter-spacing: -0.3px;
}

h3 {
    color: var(--apple-dark);
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
}

.input-group {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
}

.url-input {
    flex: 1;
    padding: 1rem;
    border: 1px solid var(--apple-gray);
    border-radius: 12px;
    font-size: 1rem;
    transition: all 0.3s ease;
}

.url-input:focus {
    outline: none;
    border-color: var(--apple-blue);
    box-shadow: 0 0 0 3px rgba(0, 122, 255, 0.1);
}

.btn {
    padding: 1rem 2rem;
    border: none;
    border-radius: 12px;
    background-color: var(--apple-blue);
    color: #fff;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
}

.btn:hover {
    background-color: #0056b3;
    transform: translateY(-1px);
}

.btn-primary {
    background-color: var(--apple-green);
    width: 100%;
    margin-top: 1rem;
}

.btn-primary:hover {
    background-color: #2da44e;
}

.info-container {
    background-color: var(--apple-light-gray);
    padding: 2rem;
    border-radius: 16px;
}

.video-info {
    display: flex;
    gap: 2rem;
    margin-bottom: 1.5rem;
}

.thumbnail {
    width: 240px;
    height: 135px;
    object-fit: cover;
    border-radius: 12px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.details {
    flex: 1;
}

.details p {
    color: var(--apple-secondary-text);
    margin-bottom: 0.75rem;
}

.progress-container {
    background-color: var(--apple-light-gray);
    padding: 2rem;
    border-radius: 16px;
}

.progress-bar {
    width: 100%;
    height: 8px;
    background-color: #E5E5EA;
    border-radius: 4px;
    overflow: hidden;
}

.progress {
    width: 0;
    height: 100%;
    background-color: var(--apple-green);
    transition: width 0.3s ease;
}

.progress-info {
    display: flex;
    justify-content: space-between;
    margin-top: 1rem;
    color: var(--apple-secondary-text);
    font-size: 0.9rem;
}

.error-message {
    margin-top: 1rem;
    padding: 1rem;
    background-color: #FFF2F2;
    color: var(--apple-red);
    border-radius: 12px;
    text-align: center;
    font-weight: 500;
}

.features ul {
    list-style: none;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
}

.features li {
    padding: 1.5rem;
    background-color: var(--apple-light-gray);
    border-radius: 12px;
    position: relative;
    padding-left: 2.5rem;
}

.features li:before {
    content: "✓";
    position: absolute;
    left: 1rem;
    color: var(--apple-green);
    font-weight: bold;
}

.platform-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.platform-item {
    background-color: var(--apple-light-gray);
    padding: 2rem;
    border-radius: 16px;
    text-align: center;
}

.platform-item h3 {
    color: var(--apple-blue);
    margin-bottom: 1rem;
}

.platform-item p {
    color: var(--apple-secondary-text);
}

@media (max-width: 768px) {
    .container {
        margin: 1rem;
        padding: 1.5rem;
    }

    h1 {
        font-size: 2.5rem;
    }

    .video-info {
        flex-direction: column;
    }

    .thumbnail {
        width: 100%;
        height: auto;
        max-height: 200px;
    }

    .features ul,
    .platform-grid {
        grid-template-columns: 1fr;
    }
}