/* Reset CSS */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: Roboto, sans-serif;
}

/* Smooth Scroll */
html {
    scroll-behavior: smooth;
}

/* CSS Variables for Vietnamese-Inspired Colors and Header */
:root {
    --primary-nav-color: #1976D2;
    /* Deep blue for header and auth */
    --primary-nav-hover: #1565C0;
    /* Darker blue for hover */
    --toggle-border: #BBDEFB;
    /* Light blue for toggle border */
    --primary-color: #ff2d55;
    --secondary-color: #fff9e6;
    --accent-color: #ffd700;
    --text-dark: #2c3e50;
    --text-light: #fff;
    --background-light: #e6f4ea;
    --shadow: rgba(0, 0, 0, 0.15);
    --hover-color: #e91e63;
    --gradient: linear-gradient(135deg, #ff2d55 0%, #ffd700 100%);
    --form-border: #ddd;
    --success-color: #28a745;
    --error-color: #dc3545;
}

/* Clearfix */
.clear {
    clear: both;
}

.text-white {
    color: var(--text-light) !important;
}

.text-black {
    color: var(--text-dark) !important;
}

#Main {
    background-color: var(--secondary-color);
    font-family: 'Quicksand', sans-serif;
    position: relative;
}

#Main::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url('./img/vietnamese-pattern.png') repeat;
    opacity: 0.05;
    z-index: -1;
}

/* Header Styles */
#header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 30px;
    background: #ffffff;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 10;
}

.logo-container {
    display: flex;
    align-items: center;
}

.logo-nav {
    display: flex;
    align-items: center;
    font-size: 24px;
    font-weight: bold;
    color: var(--primary-nav-color);
    text-decoration: none;
}

.logo-nav img {
    height: 60px;
    margin-right: 10px;
    border-radius: 40px;
}

.logo::before {
    content: "♥";
    margin-right: 5px;
    color: var(--primary-nav-color);
}

.slogan {
    font-size: 14px;
    color: #666;
    margin-left: 10px;
    font-style: italic;
}

.impact {
    display: flex;
    align-items: center;
    color: var(--primary-nav-color);
    font-size: 14px;
    margin-left: 20px;
}

.impact::before {
    content: "♥";
    margin-right: 5px;
    color: var(--primary-nav-color);
}

.menu a {
    margin: 0 25px;
    text-decoration: none;
    color: #666;
    font-size: 16px;
    transition: color 0.3s;
}

.menu a:hover {
    color: var(--primary-nav-color);
}

.right-section {
    display: flex;
    align-items: center;
    gap: 10px;
}

.language {
    font-size: 20px;
    cursor: pointer;
    color: #666;
    transition: color 0.3s;
}

.language:hover {
    color: var(--primary-nav-color);
}

.login-btn {
    background: transparent;
    border: 2px solid var(--primary-nav-color);
    color: var(--primary-nav-color);
    padding: 6px 15px;
    border-radius: 5px;
    text-decoration: none;
    font-size: 16px;
    transition: all 0.3s;
}

.login-btn:hover {
    background: var(--primary-nav-color);
    color: white;
}

.donate-btn {
    background: var(--primary-nav-color);
    color: white;
    padding: 8px 20px;
    border-radius: 5px;
    text-decoration: none;
    font-size: 16px;
    transition: background 0.3s;
}

.donate-btn:hover {
    background: var(--primary-nav-hover);
}

.hamburger {
    display: none;
    cursor: pointer;
}

.hamburger i {
    font-size: 24px;
    color: #666;
}

/* Donation Section */
#donate {
    padding: 120px 0;
    background: linear-gradient(135deg, #e6f4ea 0%, #d1e8d5 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

.auth-container {
    width: 100%;
    max-width: 500px;
    margin: 0 auto;
    background: var(--text-light);
    border-radius: 20px;
    box-shadow: 0 6px 15px var(--shadow);
    padding: 40px;
    position: relative;
    border: 2px solid transparent;
    background-clip: padding-box;
}

.auth-container::before {
    content: '';
    position: absolute;
    top: -2px;
    left: -2px;
    right: -2px;
    bottom: -2px;
    background: var(--gradient);
    z-index: -1;
    border-radius: 22px;
}

.auth-toggle {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-bottom: 30px;
}

.toggle-btn {
    background: none;
    border: none;
    font-size: 18px;
    font-weight: 600;
    color: var(--text-dark);
    padding: 10px 20px;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
}

.toggle-btn.active {
    color: var(--primary-nav-color);
    border-bottom: 3px solid var(--toggle-border);
}

.toggle-btn:hover {
    color: var(--primary-nav-color);
}

.auth-form {
    display: none;
    transition: all 0.5s ease;
}

.auth-form.active {
    display: block;
    animation: slideIn 0.5s ease forwards;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateX(20px);
    }

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

.form-title {
    font-size: 28px;
    font-weight: 700;
    color: var(--primary-nav-color);
    text-align: center;
    margin-bottom: 30px;
}

.form-group {
    margin-bottom: 20px;
    text-align: left;
}

.form-group label {
    display: block;
    font-size: 15px;
    font-weight: 500;
    color: var(--text-dark);
    margin-bottom: 8px;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px;
    font-size: 15px;
    border: 1px solid var(--form-border);
    border-radius: 5px;
    outline: none;
    transition: border-color 0.3s ease;
    font-family: 'Quicksand', sans-serif;
}

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

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    border-color: var(--primary-nav-color);
}

.auth-btn {
    background: var(--primary-nav-color);
    color: var(--text-light);
    padding: 12px 30px;
    border: none;
    border-radius: 25px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    display: block;
    margin: 20px auto 0;
    transition: all 0.3s ease;
}

.auth-btn:hover {
    background: var(--primary-nav-hover);
    transform: scale(1.05);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
}

.form-message {
    margin-top: 15px;
    font-size: 15px;
    text-align: center;
}

.form-message.success {
    color: var(--success-color);
}

.form-message.error {
    color: var(--error-color);
}

/* Payment Info Section */
.payment-info {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 15px;
    padding: 20px;
    margin: 20px 0;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
}

.payment-info .qr-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.payment-info h3 {
    color: #2c3e50;
    font-size: 1.2em;
    margin-bottom: 20px;
    font-weight: 600;
    position: relative;
    padding-bottom: 10px;
}

.payment-info h3:after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 50px;
    height: 2px;
    background: #3498db;
}

.payment-info .qr-code {
    width: 200px;
    height: 200px;
    margin: 15px 0;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease;
}

.payment-info .qr-code:hover {
    transform: scale(1.05);
}

.payment-info p {
    color: #555;
    margin: 10px 0;
    font-size: 0.95em;
}

.bank-info {
    margin-top: 20px;
    padding: 15px;
    background: #f8f9fa;
    border-radius: 8px;
    width: 100%;
    max-width: 300px;
}

.bank-info p {
    margin: 8px 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.9em;
}

.bank-info strong {
    color: #2c3e50;
    margin-right: 10px;
}

#transfer-code {
    color: #e74c3c;
    font-weight: 600;
    letter-spacing: 1px;
}

/* Animation khi hiển thị QR */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }

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

.payment-info {
    animation: fadeIn 0.3s ease-out forwards;
}

/* Back to Top Button */
#back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    background: var(--gradient);
    color: var(--text-light);
    border: none;
    border-radius: 50%;
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

#back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

#back-to-top:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
}

/* Responsive Design */
@media (max-width: 768px) {
    #header {
        flex-wrap: wrap;
        padding: 10px 15px;
    }

    .logo-container {
        flex: 1;
    }

    .menu {
        display: none;
        flex-direction: column;
        width: 100%;
        background: #ffffff;
        position: absolute;
        top: 90px;
        left: 0;
        box-shadow: 0 5px 10px var(--shadow);
    }

    .menu.active {
        display: flex;
    }

    .menu a {
        margin: 10px 0;
        text-align: center;
        padding: 10px 0;
        border-bottom: 1px solid rgba(0, 0, 0, 0.1);
    }

    .hamburger {
        display: block;
    }

    .right-section {
        margin-top: 10px;
    }

    .auth-container {
        padding: 20px;
    }

    .slogan,
    .impact {
        display: none;
    }

    .payment-info {
        padding: 15px;
    }

    .payment-info .qr-code {
        width: 150px;
        height: 150px;
    }

    .bank-info {
        padding: 10px;
    }

    .payment-info h3 {
        font-size: 1.1em;
    }
}

@media (max-width: 600px) {
    .auth-toggle {
        flex-direction: column;
        gap: 10px;
    }

    .toggle-btn {
        padding: 8px 15px;
        font-size: 16px;
    }

    .form-title {
        font-size: 24px;
    }
}