/* Nút Zalo cố định góc trái */
    .zalo-button {
        position: relative;
        width: 60px;
        height: 60px;
        background: linear-gradient(45deg, #0068ff, #0068ff);
        border-radius: 50%;
        box-shadow: 0 4px 12px rgba(0, 104, 255, 0.3);
        display: flex;
        align-items: center;
        justify-content: center;
        cursor: pointer;
        animation: pulse 2s infinite;
        transition: all 0.3s ease;
        border: none;
        z-index: 10;
    }

    .zalo-button:hover {
        transform: scale(1.1);
        box-shadow: 0 6px 16px rgba(0, 104, 255, 0.4);
    }

    .zalo-button img {
        width: 35px;
        height: 35px;
        border-radius: 0;
        filter: brightness(0) invert(1);
    }

    /* Hiệu ứng nhấp nháy mạnh - biên độ 30% */
    @keyframes pulse {
        0% { transform: scale(1); }
        50% { transform: scale(1.3); }
        100% { transform: scale(1); }
    }

    /* Sóng xung kích */
    .zalo-ripple {
        position: absolute;
        top: 50%;
        left: 50%;
        width: 60px;
        height: 60px;
        border: 2px solid #0068ff;
        border-radius: 50%;
        animation: ripple 3s infinite linear;
        z-index: 1;
        transform: translate(-50%, -50%);
    }

    .zalo-ripple:nth-child(1) {
        animation-delay: 0s;
    }

    .zalo-ripple:nth-child(2) {
        animation-delay: 1s;
    }

    .zalo-ripple:nth-child(3) {
        animation-delay: 2s;
    }

    @keyframes ripple {
        0% {
            transform: translate(-50%, -50%) scale(1);
            opacity: 1;
        }
        100% {
            transform: translate(-50%, -50%) scale(1.5);
            opacity: 0;
        }
    }

    /* Container cho nút và sóng xung kích */
    .zalo-container {
        position: fixed;
        bottom: 25px;
        left: 25px;
        z-index: 9999;
        width: 60px;
        height: 60px;
        display: flex;
        align-items: center;
        justify-content: center;
    }

    /* Responsive */
    @media (max-width: 768px) {
        .zalo-container {
            bottom: 15px;
            left: 15px;
            width: 55px;
            height: 55px;
        }
        
        .zalo-button, .zalo-ripple {
            width: 55px;
            height: 55px;
        }
        
        .zalo-button img {
            width: 30px;
            height: 30px;
        }
    }
/* Nút Zalo cố định góc trái */


/* Fonts */
@font-face {
  font-family: 'Roboto';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  
}
@font-face {
  font-family: 'Roboto';
  font-style: normal;
  font-weight: 700;
  font-display: swap;
}

/* Variables */
:root {
  /* General */
  --border-radius: 8px;
  --gutter-x: 0.5rem;
  --gutter-y: 1rem;
  --link-text-color: blue;
  --shadow-color: rgba(0, 0, 0, 0.3);
  --whitespace-color: #fff;
  --site-background-color: #f9fafc;
  --sidebar-width: 300px;
  /* Important Notice */
  --important-notice-background-color: #222;
  --important-notice-text-color: #fff;
  --header-background-color: transparent;
  --header-text-color: var(--default-text-color);
  /* Cookie Notice */
  --cookie-notice-background-color: rgba(45, 45, 56, 0.75);
  --cookie-notice-text-color: #fff;
  /* Navigation */
  --navigation-background-color: #d7dae3;
  --navigation-background-color-hover: rgba(0, 0, 0, 0.05);
  --navigation-background-color-active: rgba(0, 0, 0, 0.15);
  --navigation-text-color: #222;
  --navigation-text-color-hover: var(--navigation-text-color);
  --navigation-text-color-active: var(--navigation-text-color);
  /* Navigation */
  --offcanvas-background-color: var(--navigation-background-color);
  --offcanvas-text-color: var(--navigation-text-color);
  /* Defaults */
  --default-background-color: #edeff3;
  --default-border-color: #efeff9;
  --default-line-height: 1.3333;
  --default-text-font: 'Asap', Arial, 'Helvetica Neue', Helvetica, sans-serif;
  --default-text-color: #222;
  --default-text-size: 15px;
  /* Buttons */
  --default-button-background-color: #f9f9f9;
  --default-button-background-color-hover: #f3f3f3;
  --default-button-background-color-active: #f3f3f3;
  --default-button-border-color: rgba(0, 0, 0, 0.075);
  --default-button-text-color: #333;
  --primary-button-background-color: #2e9cd4;
  --primary-button-background-color-hover: #ddd;
  --primary-button-background-color-active: #bdbdbd;
  --primary-button-border-color: rgba(0, 0, 0, 0.075);
  --primary-button-text-color: #fff;
  --success-button-background-color: #98cc34;
  --success-button-background-color-hover: #9dcf3e;
  --success-button-background-color-active: #89b82e;
  --success-button-border-color: rgba(0, 0, 0, 0.075);
  --success-button-text-color: #fff;
  --warning-button-background-color: #f0ad4e;
  --warning-button-background-color-hover: #f2b866;
  --warning-button-background-color-active: #f1b25a;
  --warning-button-border-color: rgba(0, 0, 0, 0.1);
  --warning-button-text-color: #aa0000;
  --danger-button-background-color: #d9534f;
  --danger-button-background-color-hover: #de6764;
  --danger-button-background-color-active: #db5d59;
  --danger-button-border-color: rgba(0, 0, 0, 0.1);
  --danger-button-text-color: #fff;
  /* Notices */
  --default-notice-background-color: #e6e8ed;
  --default-notice-text-color: #000;
  --default-notice-border-color: #e6e8ed;
  --primary-notice-background-color: #3ba5c6;
  --primary-notice-text-color: #fff;
  --primary-notice-border-color: #3ba5c6;
  --success-notice-background-color: #98cc34;
  --success-notice-text-color: #fff;
  --success-notice-border-color: #98cc34;
  --warning-notice-background-color: #ffcc66;
  --warning-notice-text-color: #aa0000;
  --warning-notice-border-color: #ffcc66;
  --danger-notice-background-color: #d9534f;
  --danger-notice-text-color: #fff;
  --danger-notice-border-color: #d9534f;
  /* Breadcrumbs */
  --breadcrumbs-background-color: #ededf1;
  --breadcrumbs-text-color: #555;
  --breadcrumbs-border-color: transparent;
  /* Cards */
  --card-background-color: #fff;
  --card-text-color: var(--default-text-color);
  --card-border-color: var(--default-border-color);
  --card-header-background-color: transparent;
  --card-header-text-color: var(--card-text-color);
  --card-body-background-color: transparent;
  --card-footer-background-color: #fbfbfd;
  /* Input */
  --input-background-color: #fafafc;
  --input-padding-x: 1.5em;
  --input-padding-y: 0.5em;
  --input-text-color: #000;
  --input-border-radius: 1em;
  /* Pills */
  --pills-background-color: transparent;
  --pills-background-color-active: #d7dae3;
  --pills-background-color-hover: #f1f3f7;
  --pills-text-color: var(--default-text-color);
  --pills-text-color-active: #222;
  /* Tabs */
  --tabs-pane-background-color: #eff2f5;
  --tabs-pane-border-color: var(--tabs-pane-background-color);
  --tabs-background-color: #e8e8eb;
  --tabs-background-color-active: #fff;
  --tabs-text-color: #333;
  --tabs-text-color-active: var(--tabs-text-color);
  --tabs-border-color: var(--tabs-background-color);
  --tabs-border-color-active: var(--tabs-background-color-active);
  --tabs-content-background-color: #fff;
  /* Dropdowns */
  --dropdown-menu-background-color: #fff;
  --dropdown-menu-item-background-color: var(--dropdown-menu-background-color);
  --dropdown-menu-item-text-color: var(--default-text-color);
  /* Tables */
  --table-striped-row-background-odd: #f5f6f9;
  --table-striped-row-background-even: #fff;
  --table-row-hover-background: #ececec;
  /* Pagination */
  --pagination-background-color: var(--default-background-color);
  --pagination-background-color-active: #d7dae3;
  --pagination-background-color-hover: #e7e8ed;
  --pagination-text-color: var(--default-text-color);
  --pagination-text-color-active: var(--default-text-color);
  --pagination-text-color-hover: var(--default-text-color);
  --pagination-border-color: var(--default-border-color);
  /* Footer */
  --footer-background-color: #ededf1;
  --footer-title-color: var(--default-text-color);
  --footer-text-color: var(--default-text-color);
  /* Copyright */
  --copyright-background-color: #e2e2e7;
  --copyright-text-color: var(--default-text-color);
}
@media (min-width: 768px) {
  :root {
    --gutter-x: 1rem;
    --gutter-y: 1rem;
  }
}
@media (min-width: 992px) {
  :root {
    --gutter-x: 1.5rem;
    --gutter-y: 1.5rem;
  }
}
@media (min-width: 1200px) {
  :root {
    --gutter-x: 2rem;
    --gutter-y: 2rem;
  }
}