/* =========================================================================
   navbar.css
   Three-zone header — visually identical to Folder-2.
   · Logo  : pinned to far LEFT edge of the viewport (small breathing margin)
   · Nav   : Bootstrap bg-primary-bg-opacity-10 PILL · absolutely centered
   · Actions: pinned to far RIGHT edge of the viewport (small breathing margin)
   ========================================================================= */

.navbar-overlay {
    position: fixed;
    top: 0;
    z-index: 98;
    width: 100%;
    transition: background-color .35s ease, box-shadow .35s ease;
}
.navbar-sticky-init .navbar-overlay {
    background-color: #fff !important;
    box-shadow: 0 4px 14px rgba(0, 0, 0, 0.07);
}

.navbar-1 { z-index: 99; }
.navbar.navbar-1 {
    background: #fff;
    /* Trimmed from 14px: the bar was 86px tall around a 60px pill. */
    padding-top: 9px;
    padding-bottom: 9px;
}

/* -------- Edge-pinned 3-zone layout --------
   We override Bootstrap's `.container` for the navbar only so the brand and
   action cluster hug the viewport edges with a small symmetric margin. */
.navbar.navbar-1 > .container {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: nowrap;
    gap: 24px;
    max-width: 100% !important;
    width: 100%;
    margin: 0 !important;
    padding-inline: 28px !important;   /* the "little margin" from each edge */
}
@media (max-width: 575px) {
    .navbar.navbar-1 > .container { padding-inline: 16px !important; }
}

/* Brand pinned LEFT */
.navbar.navbar-1 .navbar-brand {
    margin: 0;
    flex: 0 0 auto;
    display: inline-flex;
    align-items: center;
    transition: transform .35s ease;
}
.navbar.navbar-1 .navbar-brand:hover { transform: translateY(-1px); }
.logo__img {
    max-width: 100%;
    max-height: 42px;
    object-fit: contain;
}
.logo__sticky { display: none; }

/* -------- Center pill — double-layered SQUARE with rounded corners --------
   White inner card + soft lavender outer ring + thin purple stroke. */
.nav-center-pill {
    background-color: #ffffff;
    border: 0;                              /* no inner border */
    padding: 6px 14px;
    border-radius: 16px;                    /* square w/ rounded corners */
    box-shadow:
        0 0 0 8px #ece4ff,                  /* ONLY the soft lavender outer ring */
        0 12px 28px -16px rgba(92, 43, 255, 0.30);
    transition: box-shadow .35s ease, transform .35s ease;
}
.nav-center-pill:hover {
    transform: translateY(-1px);
    box-shadow:
        0 0 0 8px #e6ddff,
        0 16px 36px -16px rgba(92, 43, 255, 0.40);
}

/* Nav links inside: square rounded corners to match the parent shape */
.navbar.navbar-1 .navbar-nav .nav-item .nav-link { border-radius: 10px !important; }

.navbar-1 .navbar-nav { --bs-nav-link-padding-y: 11px; }

.navbar.navbar-1 .navbar-nav .nav-item .nav-link {
    font-size: 14px;
    color: #1a0063 !important;
    font-weight: 600;
    font-family: 'Plus Jakarta Sans', sans-serif;
    padding-block: 8px;
    padding-inline: 12px !important;
    background: transparent !important;
    box-shadow: none !important;
    transform: none !important;
    border-radius: 8px;
    white-space: nowrap;
    transition: color .3s ease, background-color .3s ease;
}
.navbar.navbar-1 .navbar-nav .nav-item .nav-link:hover,
.navbar.navbar-1 .navbar-nav .nav-item .nav-link.active {
    color: #5c2bff !important;
    background: rgba(92, 43, 255, 0.06) !important;
}

/* Single Bootstrap caret only */
/* Single Bootstrap caret only —— 自造三角，不再依赖 Bootstrap 默认样式 */
.navbar.navbar-1 .navbar-nav .dropdown-toggle::after {
    content: "";                                /* 必须有 */
    display: inline-block;
    width: 0;
    height: 0;
    margin-left: 0.4em;
    vertical-align: 0.15em;

    border-top: 0.3em solid currentColor;       /* 上边框 = 三角面 */
    border-right: 0.3em solid transparent;
    border-bottom: 0;
    border-left: 0.3em solid transparent;

    transition: transform .25s ease;
}
.navbar.navbar-1 .navbar-nav .nav-item.dropdown:hover > .dropdown-toggle::after,
.navbar.navbar-1 .navbar-nav .dropdown.show > .dropdown-toggle::after {
    transform: rotate(180deg);
}

/* Login arrow micro-icon */
.nav_btn_arrow {
    display: inline-block;
    transform: rotate(-50deg);
    transition: transform .3s ease;
}
.btn-student-login:hover .nav_btn_arrow {
    transform: rotate(-50deg) translateX(2px);
}

/* -------- Mobile collapse -------- */
.navbar-1 .navbar-collapse {
    background-color: #fff;
    padding-inline: 20px;
    padding-block: 20px;
    border-radius: 16px;
    margin-top: 10px;
}

@media (min-width: 1200px) {
    .navbar-1 .navbar-collapse {
        background-color: transparent;
        padding: 0;
        margin-top: 0;
        display: flex !important;
        flex-basis: auto;
        flex-grow: 1;
        justify-content: flex-end !important;
        align-items: center;
    }

    /* Center pill pinned to exact horizontal center of the navbar */
    .navbar.navbar-1 .navbar-collapse > .nav-center-pill {
        position: absolute;
        left: 50%;
        top: 50%;
        transform: translate(-50%, -50%);
        margin: 0 !important;
        z-index: 1;
        white-space: nowrap;
    }

    .navbar.navbar-1 .nav_right {
        position: relative;
        z-index: 2;
        flex: 0 0 auto;
        margin-left: auto;
    }

    /* -------- HOVER-TO-OPEN dropdowns (desktop only) -------- */
    .navbar.navbar-1 .navbar-nav .nav-item.dropdown:hover > .dropdown-menu,
    .navbar.navbar-1 .navbar-nav .nav-item.dropdown:focus-within > .dropdown-menu {
        display: block;
    }
    .navbar.navbar-1 .navbar-nav .nav-item.dropdown > .dropdown-menu {
        margin-top: 0;
        padding-top: 12px;
        background-clip: padding-box;
    }
    /* Invisible hover bridge so the cursor can travel from link to menu */
    .navbar.navbar-1 .navbar-nav .nav-item.dropdown::after {
        content: "";
        position: absolute;
        left: 0;
        right: 0;
        top: 100%;
        height: 14px;
    }
}

/* Compact spacing on narrower desktops so nothing overflows */
@media (min-width: 1200px) and (max-width: 1399px) {
    .navbar.navbar-1 .navbar-nav .nav-item .nav-link {
        padding-inline: 9px !important;
        font-size: 13px;
    }
    .nav-center-pill { padding: 6px; }
    .nav_right .btn { padding: 6px 14px; }
    .nav_right .fs-14 { font-size: 13px !important; }
}

/* -------- Right cluster (lang · Student Login · Free Trial), pinned RIGHT -------- */
.nav_right {
    display: flex;
    align-items: center;
    gap: 14px;
    flex-wrap: nowrap;
    padding: 2px 2px 2px 14px;
    background: #fff;
    border-radius: 12px;
}

/* The global `.btn` rule sets min-height:50px, which was setting the whole
   bar's height. Scoped to the navbar only so other buttons keep 50px. */
.navbar.navbar-1 .nav_right .btn { min-height: 46px; }

.lang--toggle {
    background: transparent;
    padding: 6px 10px;
    border-radius: 10px;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: var(--text-dark);
    font-weight: 700;
    font-size: 13px;
    border: 0;
    transition: background-color .3s ease, transform .3s ease;
}
.lang--toggle:hover {
    background: rgba(92, 43, 255, 0.08);
    transform: translateY(-1px);
}
.lang--toggle img {
    width: 20px;
    height: 20px;
    object-fit: cover;
    border-radius: 50%;
}

/* -------- Shared button shape for Student Login + Free Trial --------
   Both buttons share the SAME box geometry so they line up perfectly:
   identical border thickness, padding, radius, and line-height. */
.btn-student-login,
.nav_right .btn-primary,
.nav_right .btn-free-trial {
    display: inline-flex;
    flex-direction: row;
    align-items: center;
    justify-content: center;
    gap: 8px;
    line-height: 1;
    height: 44px;
    padding: 0 22px;
    border-radius: 12px;
    border: 2px solid #5c2bff;
    font-family: 'Plus Jakarta Sans', sans-serif;
    font-size: 14px;
    font-weight: 700;
    text-decoration: none;
    white-space: nowrap;
    box-sizing: border-box;
    transition: background-color .3s ease, color .3s ease, transform .3s ease, box-shadow .3s ease;
}

/* Outline variant (Student Login) */
.btn-student-login {
    background: transparent;
    color: #5c2bff;
}
.btn-student-login:hover {
    background: #5c2bff;
    color: #fff;
    transform: translateY(-2px);
    box-shadow: 0 8px 18px rgba(92, 43, 255, 0.25);
}

/* Solid variant (Free Trial) */
.nav_right .btn-primary,
.nav_right .btn-free-trial {
    background-color: #5c2bff;
    color: #ffffff;
}
.nav_right .btn-primary:hover,
.nav_right .btn-free-trial:hover {
    background-color: #4a22cc;
    border-color: #4a22cc;
    color: #ffffff;
    transform: translateY(-2px);
    box-shadow: 0 8px 18px rgba(92, 43, 255, 0.30);
}

/* -------- Dropdown menus (themed) -------- */
.navbar-1 .dropdown-menu {
    border: 1px solid rgba(92, 43, 255, 0.10);
    border-radius: 14px;
    padding: 8px;
    box-shadow: 0 14px 32px rgba(26, 0, 99, 0.10);
    min-width: 220px;
    margin-top: 10px;
    animation: navDropdownIn .22s ease;
}
@keyframes navDropdownIn {
    from { opacity: 0; transform: translateY(-6px); }
    to   { opacity: 1; transform: translateY(0); }
}
.navbar-1 .dropdown-item {
    border-radius: 8px;
    padding: 10px 12px;
    font-family: 'Plus Jakarta Sans', sans-serif;
    font-weight: 600;
    color: var(--text-dark);
    font-size: 14px;
    transition: background-color .25s ease, color .25s ease, padding-left .25s ease;
}
.navbar-1 .dropdown-item:hover,
.navbar-1 .dropdown-item:focus {
    background: rgba(92, 43, 255, 0.08);
    color: var(--bg-primary);
    padding-left: 16px;
}
.navbar-1 .dropdown-item img {
    width: 18px;
    height: 18px;
    object-fit: cover;
    border-radius: 50%;
    margin-right: 8px;
    display: inline-block;
    vertical-align: middle;
}