:root {
    --bg-color: #050505;
    --text-primary: #ffffff;
    --text-secondary: #a1a1aa;
    --card-bg: rgba(20, 20, 20, 0.6);
    --card-border: rgba(255, 255, 255, 0.08);
    --primary-color: #ffffff;
    --primary-text: #000000;
    --primary-hover: #e4e4e7;
    --accent-glow: rgba(255, 255, 255, 0.15);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
    overflow-x: hidden;
    line-height: 1.5;
}

.background-effect {
    position: fixed;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 80vw;
    height: 500px;
    background: radial-gradient(ellipse at top, var(--accent-glow) 0%, rgba(5, 5, 5, 0) 70%);
    z-index: -1;
    pointer-events: none;
}

.container {
    width: 100%;
    max-width: 850px;
    padding: 2rem;
    z-index: 1;
}

.header {
    text-align: center;
    margin-bottom: 4rem;
}

.header h1 {
    font-size: 3rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: 1rem;
    background: linear-gradient(180deg, #ffffff 0%, #a1a1aa 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.header p {
    color: var(--text-secondary);
    font-size: 1.1rem;
    font-weight: 400;
}

.download-list {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.download-card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-radius: 20px;
    padding: 1.5rem 2rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    transition: transform 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}

.download-card:hover {
    transform: translateY(-2px);
    border-color: rgba(255, 255, 255, 0.2);
    box-shadow: 0 20px 40px -15px rgba(0, 0, 0, 0.8);
}

.card-content {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    flex: 1;
    padding-right: 2rem;
}

.icon-wrapper {
    width: 56px;
    height: 56px;
    background: rgba(255, 255, 255, 0.05);
    color: #ffffff;
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 16px;
    display: flex;
    justify-content: center;
    align-items: center;
    flex-shrink: 0;
}

.text-content h2 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    letter-spacing: -0.01em;
}

.text-content p {
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.6;
    word-break: keep-all;
}

.download-btn {
    background: var(--primary-color);
    color: var(--primary-text);
    text-decoration: none;
    padding: 0.875rem 1.5rem;
    border-radius: 9999px; /* Pill shape for Apple aesthetic */
    font-weight: 600;
    font-size: 0.95rem;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    gap: 0.6rem;
    flex-shrink: 0;
    box-shadow: 0 4px 14px 0 rgba(255, 255, 255, 0.1);
}

.download-btn svg {
    margin-bottom: 2px;
}

.download-btn:hover {
    background: var(--primary-hover);
    transform: scale(1.02);
    box-shadow: 0 6px 20px rgba(255, 255, 255, 0.15);
}

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

@media (max-width: 600px) {
    .download-card {
        flex-direction: column;
        text-align: center;
        padding: 2rem 1.5rem;
        gap: 1.5rem;
    }
    
    .card-content {
        flex-direction: column;
        padding-right: 0;
        gap: 1.2rem;
    }
    
    .download-btn {
        width: 100%;
        justify-content: center;
    }
}

/* Guide Link */
.guide-link {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 0.85rem;
    text-decoration: underline;
    cursor: pointer;
    margin-top: 0.6rem;
    padding: 0;
    font-family: inherit;
    transition: color 0.2s ease;
    display: inline-block;
}
.guide-link:hover {
    color: var(--text-primary);
}

/* Modal Overlay */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    z-index: 100;
    display: flex;
    justify-content: center;
    align-items: center;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
}
.modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

/* Modal Content */
.modal-content {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 20px;
    padding: 2.5rem;
    max-width: 500px;
    width: 90%;
    transform: translateY(20px) scale(0.95);
    transition: transform 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
}
.modal-overlay.active .modal-content {
    transform: translateY(0) scale(1);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}
.modal-header h3 {
    font-size: 1.25rem;
    font-weight: 600;
}
.close-btn {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 1.8rem;
    cursor: pointer;
    transition: color 0.2s;
    line-height: 1;
}
.close-btn:hover {
    color: var(--text-primary);
}
.modal-body ol {
    padding-left: 1.2rem;
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
}
.modal-body li {
    margin-bottom: 1rem;
    word-break: keep-all;
}
.modal-body strong {
    color: var(--text-primary);
}

.modal-guide h4 {
    color: var(--text-primary);
    font-size: 1.05rem;
    margin-bottom: 0.8rem;
    font-weight: 600;
}
.modal-guide p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
    margin-bottom: 1.2rem;
    word-break: keep-all;
}
.mt-4 {
    margin-top: 2rem;
}
.warning-box {
    background: rgba(255, 204, 0, 0.1);
    border: 1px solid rgba(255, 204, 0, 0.2);
    border-radius: 12px;
    padding: 1.2rem;
    margin-top: 1rem;
}
.warning-box > strong {
    color: #ffcc00;
    display: block;
    margin-bottom: 0.8rem;
    font-size: 0.95rem;
}