/* --- Theme Variables --- */
:root {
    --bg-color: #f8f9fa;
    --text-color: #333;
    --text-muted: #555;
    --text-muted-more: #6c757d;
    --header-title-color: #0056b3;
    --header-subtitle-color: #555;
    --card-bg: #ffffff;
    --card-shadow: rgba(0, 0, 0, 0.1);
    --card-shadow-hover: rgba(0, 0, 0, 0.15);
    --border-color: #e9ecef;
    --divider-color: #dee2e6;
    --accent-color: #007bff;
    --accent-hover: #0056b3;
    --input-bg: #ffffff;
    --input-border: #ced4da;
    --input-focus-border: #80bdff;
    --input-focus-shadow: rgba(0, 123, 255, 0.25);
    --btn-secondary-bg: #e9ecef;
    --btn-secondary-text: #495057;
    --btn-secondary-hover: #ced4da;
    --method-card-bg: #ffffff;
    --method-card-border: #e9ecef;
    --toast-bg: rgba(52, 58, 64, 0.9);
    --popup-overlay: rgba(0, 0, 0, 0.7);
    --popup-bg: #ffffff;
    --popup-close-color: #aaa;
    --popup-close-hover: #333;
    --transition-speed: 0.3s;
    --white: #ffffff;
    --black: #000000;
    --error-color: #dc3545;
    --success-color: #28a745;
    --warning-color: #ffc107;
    --info-color: #17a2b8;
    --toast-success-bg: rgba(40, 167, 69, 0.9);
    --toast-error-bg: rgba(220, 53, 69, 0.9);
    --toast-text: var(--white);
    --spinner-border: #f3f3f3;
    --spinner-active: #007bff;
}

[data-theme="dark"] {
    --bg-color: #121212;
    --text-color: #e0e0e0;
    --text-muted: #b0b0b0;
    --text-muted-more: #888;
    --header-title-color: #66b2ff;
    --header-subtitle-color: #b0b0b0;
    --card-bg: #1e1e1e;
    --card-shadow: rgba(0, 0, 0, 0.3);
    --card-shadow-hover: rgba(0, 0, 0, 0.5);
    --border-color: #333;
    --divider-color: #444;
    --accent-color: #3399ff;
    --accent-hover: #66b2ff;
    --input-bg: #2d2d2d;
    --input-border: #444;
    --input-focus-border: #3399ff;
    --input-focus-shadow: rgba(51, 153, 255, 0.25);
    --btn-secondary-bg: #333;
    --btn-secondary-text: #e0e0e0;
    --btn-secondary-hover: #444;
    --method-card-bg: #2a2a2a;
    --method-card-border: #3a3a3a;
    --toast-bg: rgba(240, 240, 240, 0.95);
    --popup-overlay: rgba(0, 0, 0, 0.85);
    --popup-bg: #1e1e1e;
    --popup-close-color: #888;
    --popup-close-hover: #e0e0e0;
    --white: #ffffff;
    --black: #000000;
    --error-color: #ff4d4d;
    --success-color: #4cd964;
    --warning-color: #ffcc00;
    --info-color: #66b2ff;
    --toast-success-bg: rgba(220, 255, 220, 0.95);
    --toast-error-bg: rgba(255, 220, 220, 0.95);
    --toast-text: var(--black);
    --spinner-border: #333;
    --spinner-active: #3399ff;
}

/* --- Reset cơ bản & Thiết lập chung --- */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    background-color: var(--bg-color);
    color: var(--text-color);
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 20px;
    overflow-x: hidden;
    transition: background-color var(--transition-speed) ease, color var(--transition-speed) ease;
}

/* --- Header --- */
header {
    text-align: center;
    margin-bottom: 50px;
    width: 100%;
    max-width: 900px;
    opacity: 0;
    animation: fadeInDown 0.8s ease-out forwards;
    animation-delay: 0.2s;
    position: relative;
    padding-top: 60px;
    /* Padding chống đè language switcher */
}

header h1 {
    color: var(--header-title-color);
    margin-bottom: 10px;
    font-size: 2.2em;
    transition: color var(--transition-speed) ease;
}

header p {
    color: var(--header-subtitle-color);
    font-size: 1.1em;
    transition: color var(--transition-speed) ease;
}

/* --- Main Content & Sections --- */
main {
    width: 100%;
    /* max-width: 900px; */
}

.payment-category {
    /* Style chung cho các section */
    background-color: var(--card-bg);
    border-radius: 16px;
    padding: 30px;
    margin-bottom: 40px;
    box-shadow: 0 6px 25px var(--card-shadow);
    border: 1px solid var(--border-color);
    position: relative;
    transition: background-color var(--transition-speed) ease, border-color var(--transition-speed) ease, box-shadow var(--transition-speed) ease;
}

/* --- Styling cho hiệu ứng xuất hiện khi cuộn --- */
.animate-on-scroll {
    opacity: 0;
    transform: translateY(30px);
    /* Thêm transition cho background-color */
    transition: opacity 0.6s ease-out, transform 0.6s ease-out,
        background-color 0.8s ease-out;
    background-color: transparent;
    /* Nền ban đầu trước hiệu ứng */
}

.animate-on-scroll.is-visible {
    opacity: 1;
    transform: translateY(0);
}

/* ---------------------------------------------- */

.payment-category h2 {
    color: var(--header-title-color);
    margin-bottom: 30px;
    border-bottom: 2px solid var(--divider-color);
    padding-bottom: 15px;
    display: flex;
    align-items: center;
    font-size: 1.7em;
    transition: color 0.3s ease, border-bottom-color var(--transition-speed) ease;
}

.payment-category h2:hover {
    color: var(--accent-hover);
}

.payment-category h2 i {
    margin-right: 12px;
    font-size: 1.1em;
    color: var(--accent-color);
    transition: transform 0.3s ease, color var(--transition-speed) ease;
}

.payment-category h2:hover i {
    transform: scale(1.1);
}

/* --- Payment Methods Container (Grid Layout) --- */
.payment-methods-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
}

/* --- Payment Method Block --- */
.payment-method {
    padding: 25px;
    border-radius: 12px;
    border: 1px solid var(--method-card-border);
    background-color: var(--method-card-bg);
    text-align: center;
    transition: transform 0.3s cubic-bezier(0.25, 0.8, 0.25, 1),
        box-shadow 0.3s cubic-bezier(0.25, 0.8, 0.25, 1), filter 0.3s ease,
        background-color var(--transition-speed) ease, border-color var(--transition-speed) ease,
        opacity 0.3s ease;
    box-shadow: 0 4px 10px var(--card-shadow);
    position: relative;
    /* Cần cho icon inactive */
    overflow: hidden;
    /* Ẩn phần thừa của icon inactive */
}

.payment-method:hover:not(.payment-method-inactive) {
    /* Chỉ hover khi active */
    transform: translateY(-8px) scale(1.02);
    box-shadow: 0 12px 30px rgba(0, 0, 0, 0.15);
}

.payment-method .logo {
    max-width: 90px;
    max-height: 45px;
    height: auto;
    margin-bottom: 20px;
    object-fit: contain;
    transition: transform 0.3s ease;
    background-color: var(--white);
    padding: 8px;
    border-radius: 8px;
    box-shadow: 0 2px 5px var(--card-shadow);
}

.payment-method:hover:not(.payment-method-inactive) .logo {
    transform: scale(1.1);
}

.payment-method h3 {
    color: var(--text-color);
    margin-bottom: 15px;
    font-size: 1.25em;
    word-break: break-word;
    transition: color var(--transition-speed) ease;
}

.payment-method p {
    margin-bottom: 12px;
    color: var(--text-muted);
    font-size: 0.98em;
    word-wrap: break-word;
    transition: color var(--transition-speed) ease;
}

.payment-method p strong {
    color: var(--text-color);
    transition: color var(--transition-speed) ease;
}

/* --- Styles cho nền khối tối (Dark Background) --- */
.payment-method.dark-background .copy-btn {
    background-color: rgba(255, 255, 255, 0.2);
    color: var(--white);
}

.payment-method.dark-background .copy-btn:hover {
    background-color: rgba(255, 255, 255, 0.3);
}

/* --------------------------------------------- */

/* --- Inactive Payment Method Styles --- */
.payment-method-inactive {
    cursor: not-allowed;
    filter: grayscale(90%);
    opacity: 0.65;
    /* Nền có thể giữ màu gốc hoặc đặt thành xám nhạt nếu muốn */
    /* background-color: #f8f9fa !important; */
}

.payment-method-inactive:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 15px rgba(0, 0, 0, 0.1);
    opacity: 0.75;
    filter: grayscale(80%);
}

/* Icon ổ khóa ở góc trên bên phải */
.payment-method-inactive .inactive-lock-icon {
    position: absolute;
    top: 12px;
    right: 15px;
    font-size: 1.6rem;
    color: var(--error-color);
    z-index: 5;
    opacity: 0.8;
}

.payment-method-inactive .inactive-status {
    display: block;
    margin-top: 15px;
    padding: 5px 10px;
    background-color: var(--btn-secondary-bg);
    border-radius: 5px;
    font-weight: 600;
    color: var(--text-muted);
    font-size: 0.9em;
    text-align: center;
    position: relative;
    z-index: 3;
    transition: background-color var(--transition-speed) ease, color var(--transition-speed) ease;
}

/* Vô hiệu hóa các nút bên trong thẻ inactive */
.payment-method-inactive button,
.payment-method-inactive a {
    pointer-events: none !important;
    opacity: 0.5 !important;
}

/* Ẩn các thành phần không cần thiết khi inactive (trừ logo và tên) */
.payment-method-inactive p,
.payment-method-inactive .copy-btn,
.payment-method-inactive .app-buttons-container,
.payment-method-inactive .open-web-btn {
    display: none !important;
}

/* Giữ lại logo và tên nhưng làm mờ đi */
.payment-method-inactive .logo,
.payment-method-inactive h3 {
    opacity: 0.6;
}

/* ---------------------------------------- */

/* --- Buttons --- */
.copy-btn,
.open-app-btn,
.open-web-btn,
.open-interbank-btn,
.show-qr-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 15px;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 0.9em;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.2s ease;
    margin-top: 5px;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
    flex-grow: 1;
    flex-basis: auto;
    max-width: 250px;
    text-align: center;
    color: var(--white);
    word-break: break-word;
    line-height: 1.3;
}

/* Copy Button Riêng */
.copy-btn {
    background-color: var(--btn-secondary-bg);
    color: var(--btn-secondary-text);
    margin-left: 8px;
    vertical-align: middle;
    flex-grow: 0;
    flex-shrink: 0;
    padding: 8px 12px;
    font-size: 0.85em;
    max-width: none;
    transition: all 0.2s ease, background-color var(--transition-speed) ease, color var(--transition-speed) ease;
}

.copy-btn:hover {
    background-color: var(--btn-secondary-hover);
    transform: translateY(-2px);
    box-shadow: 0 4px 8px var(--card-shadow-hover);
}

.copy-btn:active {
    transform: scale(0.96);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.copy-icon {
    width: 14px;
    height: 14px;
    margin-right: 6px;
    transition: transform 0.2s ease;
    flex-shrink: 0;
}

.copy-btn:hover .copy-icon {
    transform: scale(1.1);
}

/* Các nút Action khác */
.open-app-btn {
    background: linear-gradient(45deg, #007bff, #0056b3);
}

.open-web-btn {
    background: linear-gradient(45deg, #6c757d, #5a6268);
}

.open-interbank-btn {
    background: #17a2b8;
}

.show-qr-btn {
    background-color: var(--text-muted-more);
    color: var(--white);
}

.show-qr-btn i {
    margin-right: 6px;
}

/* Hover/Active chung cho các nút Action */
.open-app-btn:hover,
.open-web-btn:hover,
.open-interbank-btn:hover,
.show-qr-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 12px rgba(0, 0, 0, 0.2);
    filter: brightness(1.1);
}

.open-app-btn:active,
.open-web-btn:active,
.open-interbank-btn:active,
.show-qr-btn:active {
    transform: scale(0.97);
    filter: brightness(0.95);
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.15);
}

/* Đổi màu chữ cho nút nếu nền nút sáng */
.open-app-btn.light-button-background,
.open-interbank-btn.light-button-background,
.show-qr-btn.light-button-background {
    color: var(--text-color);
}

/* ------------------------- */

/* --- Container cho các nút mở App/QR --- */
.app-buttons-container {
    display: flex;
    justify-content: center;
    align-items: stretch;
    gap: 10px;
    margin-top: 15px;
    flex-wrap: wrap;
}

/* -------------------------------------- */

/* --- Contact & Support Area (2 Columns) --- */
.contact-support-area {
    padding: 0;
    background: none;
    border: none;
    box-shadow: none;
    margin-bottom: 40px;
    width: 100%;
}

.cs-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
    align-items: stretch;
    width: 100%;
    margin-bottom: 40px;
}

.cs-left {
    display: flex;
    flex-direction: column;
    gap: 30px;
}

.cs-right {
    display: flex;
    flex-direction: column;
}

.cs-section {
    background-color: var(--card-bg);
    border-radius: 16px;
    padding: 30px;
    box-shadow: 0 6px 25px var(--card-shadow);
    border: 1px solid var(--border-color);
    transition: background-color var(--transition-speed) ease, border-color var(--transition-speed) ease, box-shadow var(--transition-speed) ease;
    display: flex;
    flex-direction: column;
    flex: 1;
}

.cs-right .cs-section {
    height: 100%;
}

.cs-section-inactive {
    position: relative;
    pointer-events: none;
    opacity: 0.65;
    filter: grayscale(90%);
}

.cs-section-inactive > *:not(h2):not(.cs-inactive-overlay) {
    display: none !important;
}

.cs-inactive-overlay {
    margin: 20px auto 10px auto;
    background: var(--btn-secondary-bg);
    padding: 20px 30px;
    border-radius: 12px;
    border: 1px dashed var(--border-color);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 10px;
    color: var(--error-color);
}
.cs-inactive-overlay i {
    font-size: 2rem;
}
.cs-inactive-overlay p {
    margin: 0;
    font-weight: 600;
    font-size: 1rem;
    color: var(--text-color);
}

#support h2,
#social-links h2 {
    margin-bottom: 20px;
    border-bottom: none;
    text-align: left;
}

#social-links h2 {
    margin-top: 0;
}

/* --- Contact Form Styles --- */
#contact-form-section h2 {
    margin-bottom: 25px;
    border-bottom: 2px solid var(--divider-color);
    padding-bottom: 15px;
    text-align: left;
}

#contact-form-section h2 i {
    color: var(--text-muted-more);
}

.form-group {
    margin-bottom: 22px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    margin-top: 5px;
    font-weight: 600;
    color: var(--text-muted);
    font-size: 0.95em;
    transition: color var(--transition-speed) ease;
}

.form-group input[type="text"],
.form-group input[type="email"],
.form-group input[type="password"],
.form-group input[type="url"],
.form-group input[type="number"],
.form-group input[type="tel"],
.form-group textarea,
.form-group input[type="file"] {
    width: 100%;
    padding: 12px 15px;
    border: 1px solid var(--input-border);
    border-radius: 10px;
    font-size: 0.95em;
    color: var(--text-color);
    background-color: var(--input-bg);
    transition: border-color 0.2s ease, box-shadow 0.2s ease, background-color var(--transition-speed) ease, color var(--transition-speed) ease;
    box-sizing: border-box;
    /* Đảm bảo padding không làm hỏng layout */
}

.form-group input:focus,
.form-group textarea:focus {
    border-color: var(--input-focus-border);
    outline: 0;
    box-shadow: 0 0 0 0.2rem var(--input-focus-shadow);
}

.form-group input:invalid,
.form-group textarea:invalid {
    /* Style khi validation lỗi */
    border-color: var(--error-color) !important;
}

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

.form-group input[type="file"] {
    display: block;
    padding: 5px;
}

.upload-zone {
    border: 2px dashed var(--input-border);
    border-radius: 12px;
    padding: 25px;
    text-align: center;
    cursor: pointer;
    background-color: var(--input-bg);
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
}

.upload-zone:hover,
.upload-zone.drag-over {
    border-color: var(--accent-color);
    background-color: var(--input-focus-shadow);
}

.upload-zone i {
    font-size: 2.5em;
    color: var(--text-muted-more);
    transition: transform 0.3s ease, color 0.3s ease;
}

.upload-zone:hover i,
.upload-zone.drag-over i {
    color: var(--accent-color);
    transform: scale(1.1);
}

.upload-zone p {
    margin: 0;
    font-size: 0.95em;
    color: var(--text-muted);
}

.file-info {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background-color: var(--btn-secondary-bg);
    padding: 10px 15px;
    border-radius: 8px;
    margin-bottom: 5px;
    font-size: 0.9em;
}

.file-info-name {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--text-color);
    overflow: hidden;
}

.file-info-name span {
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.remove-file-btn {
    background: none;
    border: none;
    color: var(--error-color);
    cursor: pointer;
    font-size: 0.85em;
    padding: 5px;
    transition: opacity 0.2s ease;
    display: flex;
    align-items: center;
    gap: 4px;
}

.remove-file-btn:hover {
    opacity: 0.8;
}

.form-group small {
    display: block;
    margin-top: 5px;
    font-size: 0.8em;
    color: var(--text-muted-more);
}

.form-row {
    display: flex;
    gap: 15px;
    flex-wrap: wrap;
    margin-bottom: 22px;
}

.form-row .form-group {
    flex: 1;
    min-width: 200px;
    margin-bottom: 0;
}

.form-hint {
    margin-bottom: 15px;
    font-size: 0.85em;
    color: var(--text-muted-more);
    display: flex;
    align-items: center;
    gap: 6px;
}

.form-submit-group {
    display: flex;
    align-items: center;
    gap: 15px;
    margin-top: 20px;
}

.submit-btn {
    padding: 10px 22px;
    font-size: 1em;
    font-weight: 600;
    border-radius: 8px;
    border: none;
    cursor: pointer;
    background: linear-gradient(45deg, var(--success-color), #218838);
    color: var(--white);
    transition: all 0.2s ease;
    box-shadow: 0 2px 5px var(--card-shadow);
}

.submit-btn:hover {
    filter: brightness(1.1);
    box-shadow: 0 4px 10px rgba(40, 167, 69, 0.4);
    transform: translateY(-2px);
}

.submit-btn:active {
    transform: scale(0.98);
    filter: brightness(0.95);
}

.submit-btn:disabled {
    opacity: 0.7;
    cursor: not-allowed;
}

.form-status {
    font-size: 0.9em;
    font-weight: 500;
}

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

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

/* --- Support & Security Section --- */
#support ul {
    list-style: none;
    padding-left: 0;
}

#support li {
    margin-bottom: 10px;
    display: flex;
    align-items: center;
}

#support li::before {
    font-family: "Font Awesome 6 Free";
    font-weight: 900;
    display: inline-block;
    margin-right: 8px;
    color: var(--success-color);
    font-size: 1.1em;
    width: 1.2em;
    text-align: center;
}

#contact-list li.phone::before {
    content: "\f095";
}

#contact-list li.email::before {
    content: "\f0e0";
}

#security-note p {
    font-style: italic;
    color: var(--text-muted-more);
    font-size: 0.9em;
    transition: color var(--transition-speed) ease;
}

/* --- Social Links Section --- */
#social-links h2 i {
    color: var(--text-muted-more);
}

.social-icons-container {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 20px;
    margin-top: 15px;
    flex-wrap: wrap;
}

.social-icons-container a {
    display: inline-block;
    line-height: 0;
}

.social-icon-img {
    width: 45px;
    height: 45px;
    border-radius: 50%;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

.social-icon-img:hover {
    transform: scale(1.15) translateY(-3px);
    box-shadow: 0 6px 12px rgba(0, 0, 0, 0.15);
}

/* --- Donation Section Styles --- */
#donation-section h2 {
    border-bottom: none;
    text-align: center;
    margin-bottom: 25px;
}

#donation-section h2 i {
    color: var(--warning-color);
}

.donation-options-container {
    display: flex;
    justify-content: center;
    align-items: flex-start;
    gap: 30px;
    margin-top: 20px;
    flex-wrap: wrap;
}

.donation-option {
    text-align: center;
    max-width: 250px;
    /* Tăng max-width để chứa icon và nút ngang hàng */
    display: flex;
    /* <-- THÊM: Sử dụng Flexbox */
    flex-direction: column;
    /* <-- THÊM: Mặc định xếp dọc (cho tên/QR) */
    align-items: center;
    /* <-- THÊM: Căn giữa theo chiều ngang */
}

.donation-option.has-icon-and-button {
    flex-direction: row;
    /* <-- THAY ĐỔI: Xếp ngang */
    align-items: center;
    /* <-- THAY ĐỔI: Căn giữa theo chiều dọc */
    gap: 15px;
    /* <-- THÊM: Khoảng cách giữa icon và nút */
    max-width: none;
    /* Bỏ max-width để tự co giãn */
    /* Có thể thêm padding hoặc background nếu muốn tách biệt hơn */
    /* padding: 10px 15px; */
    /* background-color: #f8f9fa; */
    /* border-radius: 8px; */
    /* border: 1px solid #eee; */
}

.donation-option h4 {
    margin-top: 10px;
    margin-bottom: 15px;
    font-size: 1.1em;
    color: var(--btn-secondary-text);
    font-weight: 600;
}

.donation-option img.donation-qr {
    max-width: 100%;
    height: auto;
    border: 1px solid var(--border-color);
    padding: 5px;
    background-color: var(--white);
    margin-bottom: 10px;
}

.donation-option img.donation-icon {
    width: 40px;
    /* Giảm nhẹ icon nếu cần */
    height: 40px;
    object-fit: contain;
    margin-bottom: 0;
    /* <-- THAY ĐỔI: Bỏ margin bottom khi xếp ngang */
    flex-shrink: 0;
    /* <-- THÊM: Không cho icon bị co lại */
}

.donation-option a.donate-link-btn {
    display: inline-block;
    padding: 10px 20px;
    border-radius: 8px;
    background: var(--accent-color);
    color: var(--white);
    text-decoration: none;
    font-weight: 600;
    transition: all 0.2s ease;
    flex-grow: 1;
    /* <-- THÊM: Cho nút chiếm phần không gian còn lại */
    max-width: 200px;
    /* Có thể giới hạn lại chiều rộng nút */
    margin-top: 0;
    /* <-- THAY ĐỔI: Bỏ margin top khi xếp ngang */
}

.donation-option a.donate-link-btn:hover {
    background: var(--accent-hover);
    transform: translateY(-2px);
    box-shadow: 0 4px 8px var(--card-shadow);
}

/* --- Footer --- */
footer {
    text-align: center;
    margin-top: 50px;
    padding-top: 25px;
    border-top: 1px solid var(--divider-color);
    width: 100%;
    max-width: 900px;
    color: var(--text-muted-more);
    font-size: 0.9em;
    opacity: 0;
    animation: fadeInUp 0.8s ease-out forwards;
    animation-delay: 0.5s;
    transition: border-top-color var(--transition-speed) ease, color var(--transition-speed) ease;
}

.visitor-counter {
    margin-top: 15px;
    display: inline-block;
    padding: 8px 15px;
    background: var(--bg-secondary);
    border-radius: 20px;
    font-size: 0.9em;
    font-weight: 500;
    color: var(--primary-color);
    box-shadow: 0 2px 5px var(--card-shadow);
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

.visitor-counter i {
    margin-right: 5px;
}

.visitor-counter:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px var(--card-shadow);
}

/* --- Keyframes Animations --- */
@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }

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

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

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

/* --- Language Switcher --- */
.language-switcher {
    position: absolute;
    top: 15px;
    right: 70px;
    /* Nhường chỗ cho theme toggle */
    background-color: var(--card-bg);
    padding: 5px 10px;
    border-radius: 8px;
    box-shadow: 0 2px 5px var(--card-shadow);
    z-index: 10;
    border: 1px solid var(--border-color);
    transition: background-color var(--transition-speed) ease, border-color var(--transition-speed) ease, box-shadow var(--transition-speed) ease;
}

.language-switcher button {
    background: none;
    border: none;
    padding: 5px 8px;
    margin: 0 2px;
    cursor: pointer;
    font-size: 0.9em;
    color: var(--text-muted);
    border-radius: 4px;
    transition: background-color 0.2s ease, color 0.2s ease;
}

.language-switcher button:hover {
    background-color: var(--btn-secondary-bg);
    color: var(--text-color);
}

.language-switcher button.active {
    background-color: var(--accent-color);
    color: var(--white);
    font-weight: bold;
}

/* --- Theme Toggle --- */
.theme-toggle {
    position: absolute;
    top: 15px;
    right: 20px;
    background-color: var(--card-bg);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    box-shadow: 0 2px 5px var(--card-shadow);
    z-index: 10;
    border: 1px solid var(--border-color);
    transition: all var(--transition-speed) ease;
    color: #f1c40f;
    /* Màu vàng cho mặt trời */
    font-size: 1.2rem;
}

.theme-toggle:hover {
    transform: scale(1.1);
    box-shadow: 0 4px 8px var(--card-shadow-hover);
}

[data-theme="dark"] .theme-toggle {
    color: #f1c40f;
    /* Giữ màu vàng hoặc chuyển sang màu khác cho mặt trăng */
}

[data-theme="dark"] .theme-toggle .fa-sun {
    display: none;
}

[data-theme="light"] .theme-toggle .fa-moon {
    display: none;
}

/* --- Toast Notification Styles --- */
#toast-container {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 2000;
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: 10px;
}

.toast {
    background-color: var(--toast-bg);
    color: var(--toast-text);
    padding: 12px 20px;
    border-radius: 8px;
    box-shadow: 0 3px 10px var(--card-shadow);
    opacity: 0;
    transition: opacity 0.4s ease, transform 0.4s ease, background-color var(--transition-speed) ease;
    transform: translateX(100%);
    font-size: 0.95em;
    max-width: 300px;
    word-wrap: break-word;
}

.toast.show {
    opacity: 1;
    transform: translateX(0);
}

.toast.success {
    background-color: var(--toast-success-bg);
}

.toast.error {
    background-color: var(--toast-error-bg);
}

/* --- POPUP QR CODE STYLES --- */
.popup-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--popup-overlay);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0s ease 0.3s, background-color var(--transition-speed) ease;
}

.popup-overlay:not([style*="display: none"]) {
    opacity: 1;
    visibility: visible;
    transition: opacity 0.3s ease, visibility 0s ease 0s;
}

.popup-content {
    background-color: var(--popup-bg);
    padding: 25px 35px;
    border-radius: 12px;
    max-width: 90%;
    width: 480px;
    max-height: 90vh;
    overflow-y: auto;
    text-align: center;
    position: relative;
    box-shadow: 0 5px 20px var(--card-shadow);
    transform: scale(0.9);
    transition: transform 0.3s ease, background-color var(--transition-speed) ease;
}

.popup-overlay:not([style*="display: none"]) .popup-content {
    transform: scale(1);
}

.popup-close {
    position: absolute;
    top: 10px;
    right: 15px;
    background: none;
    border: none;
    font-size: 2.2rem;
    color: var(--popup-close-color);
    cursor: pointer;
    line-height: 1;
    padding: 0;
    transition: color 0.2s ease;
}

.popup-close:hover {
    color: var(--popup-close-hover);
}

#popup-bank-name {
    margin-top: 0;
    margin-bottom: 15px;
    font-size: 1.3em;
    color: var(--text-color);
    font-weight: 600;
    transition: color var(--transition-speed) ease;
}

#popup-qr-image {
    display: block;
    max-width: 100%;
    height: auto;
    margin: 0 auto 0 auto;
    /* border: 1px solid #eee; */
}

#popup-account-info {
    font-size: 0.95em;
    color: var(--text-muted);
    margin-top: 15px;
    margin-bottom: 15px;
    word-wrap: break-word;
}

.popup-scan-hint {
    font-size: 0.85em;
    color: var(--text-muted-more);
    margin-top: 10px;
}

.download-qr-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 15px;
    background-color: var(--accent-color);
    color: var(--white);
    border: none;
    border-radius: 8px;
    text-decoration: none;
    font-size: 0.95em;
    font-weight: 600;
    margin-bottom: 15px;
    transition: background-color var(--transition-speed) ease;
}

.download-qr-btn:hover {
    background-color: var(--accent-hover);
    color: var(--white);
}

.download-qr-btn i {
    margin-right: 8px;
}

/* --- END POPUP QR CODE STYLES --- */

/* --- Loading Indicator Styles --- */
#loading-indicator {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--bg-color);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    z-index: 3000;
    transition: opacity 0.5s ease;
}

#loading-indicator.hidden {
    opacity: 0;
    pointer-events: none;
}

.spinner {
    border: 6px solid var(--spinner-border);
    border-top: 6px solid var(--spinner-active);
    border-radius: 50%;
    width: 50px;
    height: 50px;
    animation: spin 1s linear infinite;
    margin-bottom: 15px;
}

#loading-indicator p {
    font-weight: 500;
    color: var(--text-muted);
}

@keyframes spin {
    0% {
        transform: rotate(0deg);
    }

    100% {
        transform: rotate(360deg);
    }
}

/* --- End Loading Indicator --- */

/* --- Responsive Design --- */
@media (max-width: 992px) {
    .cs-container {
        display: flex;
        flex-direction: column;
        gap: 30px;
    }

    .cs-left,
    .cs-right {
        flex-basis: 100%;
        min-width: unset;
    }

    .cs-left {
        gap: 30px;
    }

    .cs-left > .cs-section {
        margin-bottom: 0;
    }

    /* Bỏ margin bottom khi xếp dọc */
    .cs-right .cs-section {
        height: auto;
        margin-bottom: 0;
    }
}

@media (max-width: 768px) {
    header {
        padding-top: 70px;
    }

    header h1 {
        font-size: 2em;
    }

    .payment-category h2 {
        font-size: 1.5em;
    }

    .payment-methods-container {
        grid-template-columns: 1fr;
    }

    .app-buttons-container {
        gap: 8px;
    }

    .open-app-btn,
    .open-web-btn,
    .open-interbank-btn,
    .show-qr-btn {
        padding: 10px 12px;
        font-size: 0.85em;
    }

    .language-switcher {
        top: 10px;
        right: 10px;
        padding: 3px 5px;
    }

    .language-switcher button {
        padding: 4px 6px;
        font-size: 0.8em;
    }

    #toast-container {
        right: 10px;
        top: 10px;
    }

    .toast {
        max-width: 250px;
        font-size: 0.9em;
    }

    .popup-content {
        width: 85%;
        padding: 20px 25px;
    }

    .donation-options-container {
        gap: 20px;
    }
}

@media (max-width: 480px) {
    body {
        padding: 15px;
    }

    header h1 {
        font-size: 1.8em;
    }

    .payment-category {
        padding: 20px;
    }

    .cs-section {
        padding: 20px;
    }

    .payment-category h2 {
        font-size: 1.4em;
    }

    .payment-method {
        padding: 20px;
    }

    .payment-method p {
        font-size: 0.9em;
    }

    .copy-btn {
        font-size: 0.85em;
        padding: 8px 12px;
    }

    .app-buttons-container {
        flex-direction: column;
    }

    .open-app-btn,
    .open-web-btn,
    .open-interbank-btn,
    .show-qr-btn {
        width: 100%;
        max-width: none;
    }

    .form-group input[type="text"],
    .form-group textarea {
        padding: 10px 12px;
    }

    .submit-btn {
        padding: 10px 20px;
        font-size: 0.95em;
    }

    .social-icon-img {
        width: 40px;
        height: 40px;
    }

    .social-icons-container {
        gap: 20px;
    }

    .donation-options-container {
        flex-direction: column;
        align-items: center;
    }

    .donation-option {
        max-width: 80%;
    }

    /* Tắt hiệu ứng hover nhấc lên trên mobile */
    .payment-method:hover:not(.payment-method-inactive) {
        transform: none;
        box-shadow: 0 4px 10px rgba(0, 0, 0, 0.08);
    }

    .payment-method:hover:not(.payment-method-inactive) .logo {
        transform: none;
    }

    .copy-btn:hover,
    .open-app-btn:hover,
    .open-web-btn:hover,
    .open-interbank-btn:hover,
    .show-qr-btn:hover {
        transform: none;
        box-shadow: 0 4px 8px var(--card-shadow);
        filter: brightness(1.05);
    }

    .popup-content {
        width: 90%;
        padding: 20px 20px;
    }

    #popup-bank-name {
        font-size: 1.1em;
    }

    #popup-qr-image {
        max-width: 75%;
    }

    #popup-account-info {
        font-size: 0.9em;
    }

    .popup-scan-hint {
        font-size: 0.8em;
    }

    .popup-close {
        font-size: 1.8rem;
        top: 8px;
        right: 10px;
    }
}