:root {
    /* Dark Mode Defaults */
    --bg-gradient-1: #0f2027;
    --bg-gradient-2: #203a43;
    --bg-gradient-3: #2c5364;
    --card-bg: rgba(255, 255, 255, 0.05);
    --text-color: #ffffff;
    --text-muted: #a0a0a0;
    --primary-color: #00d2ff;
    --primary-hover: #3a7bd5;
    --input-bg: transparent;
    --input-border: #444;
    --input-focus-border: #00d2ff;
    --glass-border: rgba(255, 255, 255, 0.1);
    --shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
}

body.light-mode {
    --bg-gradient-1: #e0eafc;
    --bg-gradient-2: #cfdef3;
    --bg-gradient-3: #ffffff;
    --card-bg: rgba(255, 255, 255, 0.65);
    --text-color: #333333;
    --text-muted: #666666;
    --primary-color: #2980b9;
    --primary-hover: #3498db;
    --input-bg: rgba(255, 255, 255, 0.5);
    --input-border: #ccc;
    --input-focus-border: #2980b9;
    --glass-border: rgba(255, 255, 255, 0.4);
    --shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.15);
}

@font-face {
    font-family: 'Vazirmatn';
    src: url('https://cdn.jsdelivr.net/gh/rastikerdar/vazirmatn@v33.003/fonts/webfonts/Vazirmatn-Regular.woff2') format('woff2');
}

body {
    margin: 0;
    padding: 0;
    /* Font Stack: IranSans -> Vazirmatn -> Fallback */
    font-family: 'IRANSans', 'Vazirmatn', Tahoma, Arial, sans-serif;
    background: linear-gradient(135deg, var(--bg-gradient-1), var(--bg-gradient-2), var(--bg-gradient-3));
    background-size: 400% 400%;
    animation: gradientBG 15s ease infinite;
    color: var(--text-color);
    direction: rtl;
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow-x: hidden;
}

@keyframes gradientBG {
    0% {
        background-position: 0% 50%;
    }

    50% {
        background-position: 100% 50%;
    }

    100% {
        background-position: 0% 50%;
    }
}

.container {
    width: 100%;
    max-width: 420px;
    padding: 2.5rem;
    margin: 1rem;
    background: var(--card-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-radius: 20px;
    box-shadow: var(--shadow);
    border: 1px solid var(--glass-border);
    position: relative;
    overflow: hidden;
}

/* Header & Titles */
h1 {
    text-align: center;
    margin-bottom: 2rem;
    color: var(--primary-color);
    font-size: 1.8rem;
    font-weight: 700;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

/* Floating Label Inputs */
.form-group {
    position: relative;
    margin-bottom: 2rem;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px 10px;
    font-size: 1rem;
    color: var(--text-color);
    background: var(--input-bg);
    border: none;
    border-bottom: 2px solid var(--input-border);
    outline: none;
    transition: all 0.3s;
    border-radius: 4px 4px 0 0;
    font-family: inherit;
    box-sizing: border-box;
}

.form-group input:focus,
.form-group textarea:focus {
    border-bottom-color: var(--primary-color);
    background: rgba(255, 255, 255, 0.02);
}

.form-group label {
    position: absolute;
    top: 12px;
    right: 10px;
    color: var(--text-muted);
    transition: all 0.3s ease;
    background: transparent;
    pointer-events: none;
    font-size: 1rem;
}

/* Floating effect when focused or has content */
.form-group input:focus+label,
.form-group input:not(:placeholder-shown)+label,
.form-group textarea:focus+label,
.form-group textarea:not(:placeholder-shown)+label {
    top: -20px;
    right: 0;
    font-size: 0.85rem;
    color: var(--primary-color);
    font-weight: bold;
}

textarea {
    resize: vertical;
    min-height: 80px;
}

/* Button */
.btn-pay {
    width: 100%;
    padding: 15px;
    background: linear-gradient(90deg, var(--primary-color), var(--primary-hover));
    color: #fff;
    border: none;
    border-radius: 50px;
    font-size: 1.1rem;
    font-weight: bold;
    cursor: pointer;
    transition: transform 0.3s, box-shadow 0.3s;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.2);
    margin-top: 10px;
    font-family: inherit;
}

button.btn-pay:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
}

button.btn-pay:active {
    transform: translateY(-1px);
}

/* Contact Info */
.contact-info {
    margin-top: 2.5rem;
    text-align: center;
    font-size: 0.85rem;
    color: var(--text-muted);
    border-top: 1px solid var(--glass-border);
    padding-top: 1.5rem;
}

/* Theme Toggle */
.theme-toggle {
    position: absolute;
    top: 20px;
    left: 20px;
    background: rgba(255, 255, 255, 0.1);
    border: none;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-color);
    font-size: 1.2rem;
    cursor: pointer;
    transition: all 0.3s;
    z-index: 10;
}

.theme-toggle:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: rotate(15deg);
}

/* Alerts */
.alert {
    padding: 15px;
    margin-bottom: 20px;
    border-radius: 8px;
    text-align: center;
    animation: fadeIn 0.5s ease;
}

.alert-success {
    background-color: rgba(46, 204, 113, 0.2);
    color: #2ecc71;
    border: 1px solid #2ecc71;
}

.alert-error {
    background-color: rgba(231, 76, 60, 0.2);
    color: #e74c3c;
    border: 1px solid #e74c3c;
}

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

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Remove default autofill background */
input:-webkit-autofill,
input:-webkit-autofill:hover,
input:-webkit-autofill:focus,
input:-webkit-autofill:active {
    -webkit-box-shadow: 0 0 0 30px #2c2c2c inset !important;
    -webkit-text-fill-color: white !important;
    transition: background-color 5000s ease-in-out 0s;
}

body.light-mode input:-webkit-autofill {
    -webkit-box-shadow: 0 0 0 30px #fff inset !important;
    -webkit-text-fill-color: #333 !important;
}

@media (max-width: 480px) {
    .container {
        padding: 1.5rem;
    }
}