:root {
    --primary-color: #4facfe;
    --accent-color: #00f2fe;
    --glass-bg: rgba(255, 255, 255, 0.05);
    --glass-border: rgba(255, 255, 255, 0.1);
    --glass-hover: rgba(255, 255, 255, 0.15);
    --text-color: #ffffff;
    --text-muted: rgba(255, 255, 255, 0.6);
    --gold: #f1c40f;
    --success: #2ecc71;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    -webkit-tap-highlight-color: transparent;
}

body {
    font-family: 'Montserrat', sans-serif;
    background: radial-gradient(ellipse at bottom, #1b2735 0%, #090a0f 100%);
    color: var(--text-color);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    overflow-x: hidden;
    padding: 40px 20px;
    padding-bottom: 120px;
}

#star-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    pointer-events: none;
}

.star {
    position: absolute;
    background: white;
    border-radius: 50%;
    opacity: 0;
    animation: twinkle var(--duration) ease-in-out infinite;
    box-shadow: 0 0 4px rgba(255, 255, 255, 0.8);
}

@keyframes twinkle {
    0% { opacity: 0.2; transform: scale(0.8); }
    50% { opacity: 1; transform: scale(1.2); }
    100% { opacity: 0.2; transform: scale(0.8); }
}

.header-section {
    text-align: center;
    margin-bottom: 30px;
}

.main-title {
    font-size: 32px;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-bottom: 10px;
    background: linear-gradient(to right, #fff, #4facfe);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.sub-title {
    font-size: 14px;
    color: var(--text-muted);
}

.glass-panel {
    width: 100%;
    max-width: 700px;
    background: var(--glass-bg);
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    padding: 25px;
    margin-bottom: 25px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.3);
}

.panel-header {
    font-size: 14px;
    color: var(--accent-color);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 15px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.email-input-group {
    position: relative;
}

.email-input-group i {
    position: absolute;
    left: 15px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--primary-color);
}

.form-control {
    width: 100%;
    padding: 15px 15px 15px 45px;
    background: rgba(0,0,0,0.3);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    color: #fff;
    font-size: 16px;
    outline: none;
    transition: 0.3s;
    font-family: inherit;
}

.form-control:focus {
    border-color: var(--accent-color);
    background: rgba(0,0,0,0.5);
}

.duration-options {
    display: flex;
    gap: 10px;
    margin-bottom: 25px;
}

.duration-btn {
    flex: 1;
    padding: 12px;
    background: rgba(255,255,255,0.05);
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: 10px;
    color: rgba(255,255,255,0.7);
    cursor: pointer;
    transition: 0.3s;
    font-weight: 600;
    font-size: 14px;
    text-align: center;
}

.duration-btn:hover {
    background: rgba(255,255,255,0.1);
}

.duration-btn.active {
    background: linear-gradient(135deg, rgba(79, 172, 254, 0.2), rgba(0, 242, 254, 0.2));
    border-color: var(--accent-color);
    color: #fff;
    box-shadow: 0 0 15px rgba(0, 242, 254, 0.2);
}

.device-control {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: rgba(0,0,0,0.2);
    border-radius: 15px;
    padding: 15px 20px;
    border: 1px solid rgba(255,255,255,0.05);
}

.counter-wrapper {
    display: flex;
    align-items: center;
    gap: 15px;
    background: rgba(255,255,255,0.05);
    border-radius: 30px;
    padding: 5px;
}

.counter-btn {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    border: none;
    background: rgba(255,255,255,0.1);
    color: #fff;
    font-size: 16px;
    cursor: pointer;
    transition: 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
}

.counter-btn:hover {
    background: var(--primary-color);
}

.counter-value {
    font-size: 20px;
    font-weight: 700;
    width: 40px;
    text-align: center;
}

.unit-price-display {
    text-align: right;
}
.unit-price-label { font-size: 12px; color: var(--text-muted); }
.unit-price-val { font-size: 16px; font-weight: 600; color: var(--accent-color); }

.preview-card {
    margin-top: 25px;
    background: linear-gradient(135deg, rgba(255,255,255,0.08), rgba(255,255,255,0.02));
    border-radius: 15px;
    padding: 20px;
    border: 1px dashed rgba(255,255,255,0.2);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.package-info h3 {
    font-size: 18px;
    margin-bottom: 5px;
    color: #fff;
}
.package-info p {
    font-size: 13px;
    color: var(--text-muted);
}

.checkout-bar {
    position: fixed;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    width: 90%;
    max-width: 600px;
    background: rgba(15, 23, 42, 0.95);
    backdrop-filter: blur(20px);
    padding: 15px 25px;
    border-radius: 50px;
    border: 1px solid rgba(255,255,255,0.2);
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 10px 40px rgba(0,0,0,0.6);
    z-index: 100;
    transition: 0.3s;
}

.total-info { display: flex; flex-direction: column; }
.total-label { font-size: 12px; color: var(--text-muted); }
.total-price { font-size: 22px; font-weight: 800; color: var(--accent-color); }

.btn-checkout {
    background: linear-gradient(90deg, #4facfe, #00f2fe);
    color: white;
    border: none;
    padding: 12px 30px;
    border-radius: 30px;
    font-weight: 700;
    font-size: 16px;
    cursor: pointer;
    transition: 0.3s;
    box-shadow: 0 0 20px rgba(0, 242, 254, 0.4);
    text-transform: uppercase;
    display: flex;
    align-items: center;
    gap: 10px;
}

.btn-checkout:disabled {
    background: #444;
    color: #888;
    cursor: not-allowed;
    box-shadow: none;
}

@media (max-width: 600px) {
    .device-control { flex-direction: column; gap: 15px; align-items: flex-start; }
    .unit-price-display { text-align: left; width: 100%; border-top: 1px solid rgba(255,255,255,0.1); padding-top: 10px; }
    .preview-card { flex-direction: column; text-align: center; gap: 15px; }
}