/* ==========================================================================
   RMUTL Academic Dashboard - Premium Responsive Navbar CSS (Namespaced)
   ========================================================================== */

:root {
    --custom-navbar-height: 72px;

    /* Primary */
    --custom-navbar-primary: #947119;
    --custom-navbar-primary-rgb: 148, 113, 25;

    /* Background */
    --custom-navbar-bg-rgb: 250, 248, 243;
    --custom-navbar-bg: rgba(var(--custom-navbar-bg-rgb), 0.85);

    /* Border */
    --custom-navbar-border: rgba(148, 113, 25, 0.08);

    /* Text */
    --custom-navbar-text: #1f1c14;
    --custom-navbar-text-hover: #947119;
    --custom-navbar-text-secondary: #4d473a;
    --custom-navbar-text-muted: #8c8065;
    --custom-navbar-text-light: #b3a78c;

    /* Surface */
    --custom-navbar-white: #ffffff;
    --custom-navbar-white-rgb: 255, 255, 255;
    --custom-navbar-bg-gray: #f6f2e2;

    /* Accent */
    --custom-navbar-gold: #d4af37;

    /* Dropdown */
    --custom-navbar-dropdown-bg: #ffffff;
    --custom-navbar-dropdown-hover: #faf8f3;
    --custom-navbar-dropdown-active: #fbf4da;

    /* Shadow */
    --custom-navbar-shadow:
        0 4px 20px rgba(31, 28, 20, 0.05),
        0 1px 3px rgba(31, 28, 20, 0.08);

    --custom-navbar-shadow-color: 0, 0, 0;
    --custom-transition-speed: 0.3s;
}

/* Base Navbar Layout */
.custom-navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--custom-navbar-height);
    background: var(--custom-navbar-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--custom-navbar-border);
    z-index: 1020;
    /* Above page content but below bootstrap modal (1050) */
    display: flex;
    align-items: center;
    transition: all var(--custom-transition-speed) ease;
}

.custom-navbar.scrolled {
    background: rgba(var(--custom-navbar-white-rgb), 0.96);
    box-shadow: 0 10px 30px rgba(var(--primary-rgb, var(--custom-navbar-primary-rgb)), 0.03);
    height: 64px;
}

.custom-navbar-container {
    width: 100%;
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.custom-navbar-container.container-full {
    max-width: 100%;
}

/* Brand styling */
.custom-navbar-brand {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none !important;
}

.custom-navbar-logo {
    height: 44px;
    width: auto;
    transition: transform var(--custom-transition-speed) ease;
}

.custom-navbar-brand:hover .custom-navbar-logo {
    transform: scale(1.04);
}

.custom-brand-text {
    display: flex;
    flex-direction: column;
}

.custom-brand-title {
    font-family: 'Kanit', sans-serif;
    font-weight: 700;
    font-size: 1.25rem;
    line-height: 1.1;
    letter-spacing: -0.01em;
    color: var(--custom-navbar-primary) !important;
    background: linear-gradient(135deg, var(--custom-navbar-primary) 0%, var(--custom-navbar-gold) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.custom-brand-subtitle {
    font-family: 'Kanit', sans-serif;
    font-size: 0.7rem;
    color: var(--custom-navbar-text-muted);
    font-weight: 500;
    letter-spacing: 0.02em;
}

/* Nav Menu (Desktop) */
.custom-navbar-menu {
    display: flex;
    align-items: center;
    list-style: none;
    margin: 0;
    padding: 0;
    gap: 4px;
}

.custom-nav-item {
    position: relative;
    list-style: none !important;
}

.custom-nav-link {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 8px 14px;
    font-family: 'Kanit', sans-serif;
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--custom-navbar-text) !important;
    text-decoration: none !important;
    border-radius: 8px;
    transition: all var(--custom-transition-speed) ease;
}

.custom-nav-link i {
    font-size: 0.8rem;
    color: var(--custom-navbar-text-muted);
    transition: transform var(--custom-transition-speed) ease;
}

.custom-nav-link:hover,
.custom-nav-item.active>.custom-nav-link {
    color: var(--custom-navbar-text-hover) !important;
    background: rgba(var(--primary-rgb, var(--custom-navbar-primary-rgb)), 0.05);
}

.custom-nav-link:hover i {
    color: var(--custom-navbar-text-hover) !important;
}

/* Submenu Dropdown (Desktop) */
.custom-nav-item.has-submenu:hover>.custom-nav-link i {
    transform: rotate(180deg);
}

.custom-nav-submenu {
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%) translateY(12px);
    background: var(--custom-navbar-white);
    border: 1px solid rgba(var(--custom-navbar-shadow-color), 0.08);
    border-radius: 12px;
    box-shadow: 0 10px 30px rgba(var(--custom-navbar-shadow-color), 0.08);
    width: 280px;
    padding: 8px;
    list-style: none;
    margin: 0;
    opacity: 0;
    visibility: hidden;
    transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
    z-index: 1050;
}

.custom-nav-submenu::before {
    content: '';
    position: absolute;
    top: -6px;
    left: 50%;
    transform: translateX(-50%) rotate(45deg);
    width: 12px;
    height: 12px;
    background: var(--custom-navbar-white);
    border-left: 1px solid rgba(var(--custom-navbar-shadow-color), 0.06);
    border-top: 1px solid rgba(var(--custom-navbar-shadow-color), 0.06);
}

.custom-nav-item.has-submenu:hover>.custom-nav-submenu {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(4px);
}

.custom-submenu-item {
    margin-bottom: 2px;
    list-style: none !important;
}

.custom-submenu-item:last-child {
    margin-bottom: 0;
}

.custom-submenu-link {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 9px 12px;
    font-family: 'Kanit', sans-serif;
    font-size: 0.9rem;
    color: var(--custom-navbar-text-secondary) !important;
    text-decoration: none !important;
    border-radius: 6px;
    transition: all 0.2s ease;
}

.custom-submenu-link i {
    font-size: 0.9rem;
    color: var(--custom-navbar-text-light);
    transition: color 0.2s ease;
}

.custom-submenu-link:hover {
    color: var(--custom-navbar-primary) !important;
    background: rgba(var(--primary-rgb, var(--custom-navbar-primary-rgb)), 0.06);
}

.custom-submenu-link:hover i {
    color: var(--custom-navbar-primary) !important;
}

/* Recursive Nested Submenu (Desktop) */
.nested-arrow {
    font-size: 0.75rem;
    color: var(--custom-navbar-text-light);
    transition: transform var(--custom-transition-speed) ease;
}

@media (min-width: 992px) {
    .has-nested {
        position: relative;
    }

    .custom-nested-menu {
        position: absolute;
        top: 0;
        left: 100%;
        margin-left: 6px;
        background: var(--custom-navbar-white);
        border: 1px solid rgba(var(--custom-navbar-shadow-color), 0.08);
        border-radius: 12px;
        box-shadow: 0 10px 30px rgba(var(--custom-navbar-shadow-color), 0.08);
        width: 300px;
        padding: 8px;
        list-style: none;
        margin-top: -8px;
        opacity: 0;
        visibility: hidden;
        transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
        transform: translateY(8px);
        z-index: 1060;
    }

    .has-nested:hover>.custom-nested-menu {
        opacity: 1;
        visibility: visible;
        transform: translateY(0);
    }

    .has-nested:hover>a>.nested-arrow,
    .has-nested:hover>a>span+.nested-arrow {
        transform: translateX(3px);
        color: var(--custom-navbar-primary);
    }
}

.custom-nested-item {
    margin-bottom: 2px;
    list-style: none !important;
}

.custom-nested-item:last-child {
    margin-bottom: 0;
}

.custom-nested-link {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px 12px;
    font-family: 'Kanit', sans-serif;
    font-size: 0.88rem;
    color: var(--custom-navbar-text-secondary) !important;
    text-decoration: none !important;
    border-radius: 6px;
    transition: all 0.2s ease;
}

.custom-nested-link i {
    font-size: 0.85rem;
    color: var(--custom-navbar-text-light);
    transition: color 0.2s ease;
}

.custom-nested-link:hover {
    color: var(--custom-navbar-primary) !important;
    background: rgba(var(--primary-rgb, var(--custom-navbar-primary-rgb)), 0.05);
}

.custom-nested-link:hover i {
    color: var(--custom-navbar-primary) !important;
}

/* Call-to-action Action Button */
.custom-navbar-actions {
    display: flex;
    align-items: center;
    gap: 16px;
}

.custom-btn-nav-login {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: var(--custom-navbar-primary);
    color: var(--custom-navbar-white) !important;
    font-family: 'Kanit', sans-serif;
    font-size: 0.95rem;
    font-weight: 500;
    padding: 8px 20px;
    border-radius: 50px;
    text-decoration: none !important;
    border: none;
    box-shadow: 0 4px 12px rgba(var(--primary-rgb, var(--custom-navbar-primary-rgb)), 0.15);
    transition: all var(--custom-transition-speed) ease;
}

.custom-btn-nav-login:hover {
    opacity: 0.92;
    transform: translateY(-1px);
    box-shadow: 0 6px 16px rgba(var(--primary-rgb, var(--custom-navbar-primary-rgb)), 0.25);
}

/* Hamburger Toggler */
.custom-navbar-toggler {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
    flex-direction: column;
    gap: 5px;
    z-index: 1100;
}

.custom-toggler-line {
    width: 24px;
    height: 2px;
    background-color: var(--custom-navbar-text);
    border-radius: 2px;
    transition: all 0.3s ease;
}

/* Mobile Toggler Active State */
.custom-navbar-toggler.active .custom-toggler-line:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
    background-color: var(--custom-navbar-primary);
}

.custom-navbar-toggler.active .custom-toggler-line:nth-child(2) {
    opacity: 0;
}

.custom-navbar-toggler.active .custom-toggler-line:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
    background-color: var(--custom-navbar-primary);
}

/* Mobile & Tablet Styles */
@media (max-width: 991px) {
    .custom-navbar-toggler {
        display: flex;
    }

    .custom-navbar-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 300px;
        height: 100vh;
        background: var(--custom-navbar-white);
        box-shadow: -5px 0 30px rgba(var(--custom-navbar-shadow-color), 0.1);
        display: flex;
        flex-direction: column;
        align-items: stretch;
        justify-content: flex-start;
        padding: 90px 20px 40px;
        gap: 4px;
        transition: right 0.4s cubic-bezier(0.16, 1, 0.3, 1);
        overflow-y: auto;
        z-index: 1030;
    }

    .custom-navbar-menu.active {
        right: 0;
    }

    .custom-nav-item {
        width: 100%;
    }

    .custom-nav-link {
        justify-content: space-between;
        padding: 12px 16px;
        font-size: 1rem;
    }

    .custom-nav-link i {
        font-size: 0.85rem;
    }

    .custom-nav-link.active-submenu i {
        transform: rotate(180deg);
    }

    /* Submenu inside Mobile Menu (Accordion style) */
    .custom-nav-submenu {
        position: static;
        transform: none !important;
        opacity: 1;
        visibility: visible;
        width: 100%;
        box-shadow: none;
        border: none;
        background: var(--custom-navbar-bg-gray);
        border-radius: 8px;
        padding: 6px;
        margin-top: 4px;
        display: none;
        /* Controlled by JS open class */
    }

    .custom-nav-submenu::before {
        display: none;
    }

    .custom-nav-submenu.open {
        display: block;
    }

    .custom-submenu-link {
        padding: 10px 16px;
        font-size: 0.92rem;
    }

    /* Nested Submenu inside Mobile Menu (Generic & Recursive) */
    .has-nested>a {
        display: flex;
        justify-content: space-between;
        align-items: center;
    }

    .has-nested>a.active-nested .nested-arrow {
        transform: rotate(90deg);
        color: var(--custom-navbar-primary) !important;
    }

    .custom-nested-menu {
        position: static;
        width: 100%;
        box-shadow: none;
        border: none;
        background: rgba(var(--custom-navbar-shadow-color), 0.02);
        border-radius: 8px;
        padding: 6px;
        margin-top: 4px;
        display: none;
        list-style: none;
    }

    .custom-nested-menu.open {
        display: block;
    }

    .custom-nested-link {
        padding: 9px 16px;
        font-size: 0.88rem;
    }

    .custom-navbar-actions {
        margin-top: 16px;
        padding: 0 16px;
        width: 100%;
        flex-direction: column;
        align-items: stretch;
    }

    .custom-btn-nav-login {
        justify-content: center;
        width: 100%;
        padding: 11px;
    }

    /* Dark overlay backdrop */
    .custom-navbar-backdrop {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100vh;
        background: rgba(var(--custom-navbar-shadow-color), 0.4);
        z-index: 1010;
        opacity: 0;
        visibility: hidden;
        transition: all 0.3s ease;
    }

    .custom-navbar-backdrop.active {
        opacity: 1;
        visibility: visible;
    }


}

/* Active State for Submenu and Nested Items */
.custom-submenu-item.active > .custom-submenu-link,
.custom-submenu-link.active {
    color: var(--custom-navbar-primary) !important;
    background: rgba(var(--primary-rgb, var(--custom-navbar-primary-rgb)), 0.06);
}

.custom-submenu-item.active > .custom-submenu-link i,
.custom-submenu-link.active i {
    color: var(--custom-navbar-primary) !important;
}

.custom-nested-item.active > .custom-nested-link,
.custom-nested-link.active {
    color: var(--custom-navbar-primary) !important;
    background: rgba(var(--primary-rgb, var(--custom-navbar-primary-rgb)), 0.05);
}

.custom-nested-item.active > .custom-nested-link i,
.custom-nested-link.active i {
    color: var(--custom-navbar-primary) !important;
}