/**
 * Global header (top navigation bar) - single source of truth for sizing/spacing.
 * Loaded by all layouts (web + admin). Do not override these rules in page-specific CSS.
 * Canonical design: Student Dashboard. Namespaced under .app-header for stability.
 */

/* Prevent browser default margin from creating white space above the header */
html, body { margin: 0; }

/* Base: height, background, alignment - pinned to viewport top, no gap above */
.app-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 100;
    min-height: 70px;
    padding: 6px 0;
    background-image: url("../images/main-banner-bk.png");
    background-size: cover;
    background-repeat: no-repeat;
    box-shadow: 0 2px 8px rgba(0,0,0,0.18);
}

.app-header .header_register_and_cart_btn {
    display: flex;
    align-items: center;
    gap: 10px;
}

.app-header .header_cart_btn {
    display: inline-block;
    position: relative;
}

.app-header .header_register_and_cart_btn .header_cart_btn img {
    height: 30px;
    width: 30px;
}

.app-header .nav-link {
    padding-right: 0 !important;
    padding-left: 0 !important;
    font-size: 16px;
    font-weight: 600;
    line-height: 1.4;
    color: #fff !important;
}

.app-header .navbar-nav {
    gap: 18px;
    padding-right: 12px;
    margin-left: 0;
}

.app-header .navbar-brand {
    padding: 0;
    margin-right: 16px;
}

.app-header .navbar-brand .main_logo {
    background-color: #f7f7f9;
    border-radius: 50%;
    padding: 8px;
    width: 95px;
    height: 95px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 2px 8px rgba(0,0,0,0.15);
}

.app-header .navbar-brand .main_logo img {
    height: 76px;
    width: 76px;
    object-fit: contain;
}

.app-header .header_cart_btn .cart_item_number {
    position: absolute;
    top: -4px;
    left: 21px;
    font-size: 10px;
    padding: 1px 7px;
    border-radius: 50%;
    background-color: #F85718;
    color: #fff;
}

/* Optional centered page title (quiz/success center pages) */
.app-header .navbar.navbar-expand-lg {
    position: relative;
}

.app-header .navbar-page-title {
    position: absolute;
    left: 0;
    right: 0;
    text-align: center;
    font-size: 28px;
    font-weight: 800;
    color: #0f172a;
    white-space: nowrap;
    pointer-events: none;
    z-index: 0;
    letter-spacing: -0.3px;
}

/* Responsive */
@media (max-width: 1200px) {
    .app-header .navbar-nav {
        gap: 10px;
        padding-right: 12px;
    }
    .app-header .nav-link {
        font-size: 14px;
    }
}

@media (max-width: 991px) {
    .app-header .collapse.show {
        display: block;
        background-color: #a2cbff;
        position: relative;
        padding: 16px;
        border-radius: 20px;
    }
    .app-header .nav-link {
        color: #000 !important;
        padding-right: 10px !important;
        font-size: 15px;
    }
    .app-header .collapse.show .main_action_btn {
        font-size: 12px;
    }
    .navbar-toggler:focus {
        outline: none;
        box-shadow: none;
    }
}

@media (max-width: 480px) {
    .app-header .navbar-page-title {
        font-size: 20px;
    }
}