/* Base & Reset */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

body {
    background: linear-gradient(135deg, #0f2027, #203a43, #2c5364);
    background-attachment: fixed;
    color: #ffffff;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    animation: fadeIn 0.5s ease-in-out;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Layout */
header {
    padding: 20px;
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(15, 32, 39, 0.8);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    text-align: center;
}

main {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 40px 20px;
    max-width: 800px;
    margin: 0 auto;
    width: 100%;
}

footer {
    padding: 20px;
    text-align: center;
    font-size: 0.85rem;
    color: rgba(255, 255, 255, 0.6);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

h1, h2 { margin-bottom: 20px; text-align: center; font-weight: 600; }
.helper-text { font-size: 0.85rem; color: #a8b2d1; margin-bottom: 20px; text-align: center; }

/* Glassmorphism Cards */
.glass-container {
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 20px;
    padding: 30px;
    width: 100%;
    box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.3);
    margin-bottom: 20px;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.grid-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    width: 100%;
}

.glass-card {
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: 15px;
    padding: 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    transition: all 0.3s ease;
}

.glass-card:hover {
    transform: translateY(-5px);
    background: rgba(255, 255, 255, 0.12);
    box-shadow: 0 10px 20px rgba(0,0,0,0.2);
}

.version-label {
    font-size: 1.2rem;
    font-weight: bold;
    margin-bottom: 5px;
}
.tag-label {
    font-size: 0.8rem;
    background: rgba(255,255,255,0.2);
    padding: 4px 8px;
    border-radius: 10px;
    margin-bottom: 15px;
}

/* Buttons */
.btn {
    display: inline-block;
    width: 100%;
    padding: 14px 20px;
    margin-bottom: 8px;
    border: none;
    border-radius: 12px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    text-align: center;
    text-decoration: none;
    color: #fff;
    background: linear-gradient(90deg, #00C9FF 0%, #92FE9D 100%);
    box-shadow: 0 4px 15px rgba(0, 201, 255, 0.3);
    transition: all 0.3s ease;
}

.btn:hover:not(:disabled) {
    transform: scale(1.02);
    box-shadow: 0 6px 20px rgba(0, 201, 255, 0.5);
}

.btn:active:not(:disabled) { transform: scale(0.98); }

.btn.secondary {
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    box-shadow: none;
}
.btn.secondary:hover { background: rgba(255, 255, 255, 0.2); }

.btn:disabled {
    background: rgba(255, 255, 255, 0.05);
    color: rgba(255, 255, 255, 0.3);
    cursor: not-allowed;
    box-shadow: none;
}

/* Modal */
.modal-overlay {
    position: fixed;
    top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(5px);
    -webkit-backdrop-filter: blur(5px);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
}

.modal-overlay.active {
    opacity: 1;
    pointer-events: all;
}

.modal-content {
    background: #1e293b;
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 20px;
    padding: 30px;
    max-width: 400px;
    width: 90%;
    text-align: center;
    transform: scale(0.9);
    transition: transform 0.3s ease;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
}

.modal-overlay.active .modal-content { transform: scale(1); }
.modal-content p { margin-bottom: 25px; line-height: 1.5; color: #cbd5e1; }

/* Utility */
.mb-20 { margin-bottom: 20px; }
.mt-40 { margin-top: 40px; }