:root {
    --shell-nav-shadow: 0 18px 40px rgba(45, 62, 80, 0.12);
    --shell-panel-border: rgba(106, 13, 173, 0.12);
}

html,
body {
    max-width: 100%;
    overflow-x: hidden;
}

img,
video,
canvas,
iframe {
    max-width: 100%;
}

.university-header,
.navbar-main,
.main-footer,
.alumni-main,
.about-main,
.forms-main,
.faculty-main,
.academics-main,
.organization-main,
.updates-main {
    width: 100%;
}

.global-header-row {
    width: 100%;
    min-width: 0;
}

.global-header-text {
    min-width: 0;
}

.global-header-text .college-title {
    font-size: clamp(1rem, 2.2vw, 1.8rem);
    line-height: 1.14;
    overflow-wrap: anywhere;
}

.global-header-text .college-subtitle {
    font-size: clamp(0.7rem, 1.25vw, 1rem);
    line-height: 1.3;
    overflow-wrap: anywhere;
}

.navbar-main .container {
    display: flex;
    align-items: center;
    flex-wrap: nowrap;
    gap: 0.75rem;
}

.navbar-main .navbar-toggler {
    margin-left: auto;
}

.navbar.navbar-expand-lg .navbar-collapse {
    width: auto;
    flex: 1 1 auto;
    min-width: 0;
}

.navbar-main .nav-link,
.navbar-main .dropdown-item {
    word-break: break-word;
}

.modal-dialog {
    width: min(100% - 1.5rem, var(--bs-modal-width, 800px));
}

.modal-footer {
    gap: 0.75rem;
}

.modal-footer .btn {
    min-width: 140px;
}

.main-footer .row {
    row-gap: 1rem;
}

.footer-contact-social-wrapper {
    gap: 1.5rem;
}

.section-title {
    font-size: clamp(1.45rem, 3.5vw, 2.2rem);
}

.section-subtitle {
    font-size: clamp(0.92rem, 1.65vw, 1.1rem);
}

@media (min-width: 992px) {
    .navbar.navbar-expand-lg .navbar-collapse {
        display: flex !important;
        align-items: center;
    }
}

@media (max-width: 991.98px) {
    .navbar-main .container {
        flex-wrap: wrap;
        position: relative;
    }

    /* Lock the page while the mobile navigation is open. */
    html.menu-open {
        overflow: hidden !important;
        overscroll-behavior: none;
    }

    body.menu-open {
        overflow: hidden !important;
        position: fixed !important;
        width: 100% !important;
        left: 0 !important;
        right: 0 !important;
        overscroll-behavior: none;
    }

    .navbar.navbar-expand-lg .navbar-collapse:not(.show) {
        display: none !important;
    }

    .navbar.navbar-expand-lg .navbar-collapse.show {
        display: block !important;
        animation: slideDown 0.3s ease;
    }

    @keyframes slideDown {
        from {
            opacity: 0;
            transform: translateY(-10px);
        }
        to {
            opacity: 1;
            transform: translateY(0);
        }
    }

    /* Mobile menu backdrop */
    .navbar-backdrop {
        position: fixed !important;
        top: 0 !important;
        left: 0 !important;
        right: 0 !important;
        bottom: 0 !important;
        width: 100% !important;
        height: 100% !important;
        background: rgba(0, 0, 0, 0.5) !important;
        z-index: 999 !important;
        pointer-events: auto !important;
        animation: fadeIn 0.3s ease;
    }

    @keyframes fadeIn {
        from {
            opacity: 0;
        }
        to {
            opacity: 1;
        }
    }

    .navbar-main {
        position: relative;
        z-index: 1001;
        margin-bottom: 0;
    }

    .navbar-main .navbar-collapse {
        position: absolute;
        top: calc(100% + 0.4rem);
        left: 0;
        right: 0;
        width: auto;
        max-height: calc(100vh - 10rem);
        flex: none !important;
        margin: 0 !important;
        padding: 1rem;
        border-radius: 24px;
        border: 1px solid var(--shell-panel-border);
        background: rgba(255, 255, 255, 0.98);
        box-shadow: var(--shell-nav-shadow);
        backdrop-filter: blur(10px);
        overflow-y: auto;
        overscroll-behavior: contain;
        -webkit-overflow-scrolling: touch;
        z-index: 1002;
    }

    body.menu-open .chatbot-toggle,
    body.menu-open .back-to-top-btn,
    body.menu-open #ccis-chatbot {
        opacity: 0 !important;
        visibility: hidden !important;
        pointer-events: none !important;
    }

    .navbar-main .navbar-nav {
        flex-direction: column !important;
        align-items: stretch !important;
        gap: 0 !important;
        width: 100%;
        margin: 0;
    }

    .navbar-main .nav-item {
        width: 100%;
        border-bottom: 1px solid #f0f0f0;
    }

    .navbar-main .nav-item:last-child {
        border-bottom: none;
    }

    .navbar-main .nav-link {
        display: flex !important;
        align-items: center;
        justify-content: space-between;
        width: 100%;
        margin: 0 !important;
        padding: 1rem !important;
        border-radius: 0 !important;
        font-size: 1rem !important;
        font-weight: 500;
        text-align: left !important;
        transform: none !important;
        box-shadow: none !important;
        color: #333;
        transition: background-color 0.2s ease;
    }

    .navbar-main .nav-link:hover {
        background-color: #f8f8f8;
    }

    .navbar-main .nav-link.active {
        background-color: rgba(106, 13, 173, 0.08);
        color: #6a0dad;
    }

    .navbar-main .dropdown-menu {
        position: static !important;
        inset: auto !important;
        float: none !important;
        width: 100% !important;
        min-width: 0 !important;
        margin: 0 !important;
        padding: 0 !important;
        border: none !important;
        border-radius: 0 !important;
        background: #f8f8f8 !important;
        box-shadow: none !important;
        transform: none !important;
        opacity: 1 !important;
        visibility: visible !important;
    }

    .navbar-main .dropdown-item,
    .navbar-main .dropdown-item-text {
        white-space: normal;
        padding: 0.75rem 1rem !important;
        margin-left: 1rem;
        border-radius: 0;
        font-size: 0.9rem !important;
        color: #555;
        transition: background-color 0.2s ease;
    }

    .navbar-main .dropdown-item:hover {
        background-color: #ececec !important;
        color: #333 !important;
    }

    .navbar-main .dropdown-toggle::after {
        margin-left: auto;
    }

    .main-footer .container,
    .university-header .container,
    .navbar-main .container {
        padding-left: 1rem;
        padding-right: 1rem;
    }

    .modal-dialog {
        margin: 0.75rem auto;
    }

    .modal-body {
        max-height: calc(100vh - 10rem);
    }

    .modal-footer {
        flex-direction: column-reverse;
        align-items: stretch;
    }

    .modal-footer .btn {
        width: 100%;
    }

    .directory-filters {
        flex-direction: column !important;
        align-items: stretch !important;
        gap: 0.75rem !important;
    }

    .alumni-directory-table {
        min-width: 680px !important;
    }
}

@media (max-width: 768px) {
    .global-header-row {
        gap: 0.5rem !important;
        align-items: flex-start !important;
    }

    .global-header-bisu-logo,
    .global-header-ccis-logo {
        width: 44px !important;
        height: 44px !important;
    }

    .global-header-text .college-title {
        font-size: clamp(0.9rem, 4vw, 1.3rem);
    }

    .global-header-text .college-subtitle {
        font-size: 0.7rem;
    }

    .header-auth-icon .auth-icon-link {
        width: 40px;
        height: 40px;
        font-size: 1.45rem;
    }

    .featured-alumni-container,
    .success-stories,
    .giveback-options,
    .events-container {
        grid-template-columns: 1fr !important;
        gap: 1.25rem !important;
    }

    .featured-alumni-card,
    .story-card,
    .giveback-card,
    .event-card {
        border-radius: 18px;
    }

    .table-responsive {
        padding-left: 0.85rem !important;
        padding-right: 0.85rem !important;
    }
}

@media (max-width: 576px) {
    .global-header-bisu-logo,
    .global-header-ccis-logo {
        width: 36px !important;
        height: 36px !important;
    }

    .global-header-text .college-title {
        font-size: 0.84rem;
    }

    .global-header-text .college-subtitle {
        font-size: 0.62rem;
    }

    .main-footer .container,
    .university-header .container,
    .navbar-main .container {
        padding-left: 0.85rem;
        padding-right: 0.85rem;
    }

    .navbar-main .nav-link {
        font-size: 0.89rem !important;
    }

    .footer-section {
        padding-left: 0.4rem !important;
        padding-right: 0.4rem !important;
    }

    .table-responsive {
        padding-left: 0.65rem !important;
        padding-right: 0.65rem !important;
    }

    .custom-notification {
        max-width: calc(100% - 1rem) !important;
        right: 0.5rem !important;
        left: 0.5rem !important;
    }

    .chatbot-toggle {
        right: 16px !important;
        bottom: 16px !important;
    }

    .back-to-top-btn {
        right: 16px !important;
        bottom: 82px !important;
    }
}

@media (max-width: 420px) {
    .global-header-row {
        gap: 0.35rem !important;
    }

    .global-header-text .college-title {
        font-size: 0.78rem;
    }

    .global-header-text .college-subtitle {
        font-size: 0.58rem;
    }

    .navbar-main .navbar-collapse {
        padding: 0.85rem;
        border-radius: 16px;
        top: calc(100% + 0.3rem);
    }

    .navbar-main .nav-link {
        padding: 0.8rem 0.9rem !important;
    }
}