/* =========================================================
   IP BIOTECH COLOR SYSTEM
========================================================= */
:root {
    --ip-navy: #063b52;
    --ip-navy-dark: #032b3c;
    --ip-navy-deep: #021f2c;
    --ip-teal: #159eba;
    --ip-light-blue: #62c9df;
    --ip-white: #ffffff;
    --ip-off-white: #f5f9fb;
    --ip-border: rgba(6, 59, 82, 0.10);
}

/* =========================================================
   HEADER BASE  → FIXED AT TOP
========================================================= */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    width: 100%;
    z-index: 9999;
}

/* =========================================================
   NAVIGATION
========================================================= */
.main-nav {
    position: relative;
    width: 100%;
    background: var(--ip-navy-dark);
    border-bottom: 1px solid rgba(255, 255, 255, 0.12);
    transition:
        background 0.3s ease,
        box-shadow 0.3s ease;
}

/* =========================================================
   NAV CONTAINER
========================================================= */
.nav-container {
    width: min(1400px, calc(100% - 30px));
    min-height: 88px;
    margin: 0 auto;
    padding-left: 0;
    padding-right: 0;
    display: flex;
    align-items: center;
}

/* =========================================================
   LOGO
========================================================= */
.site-logo {
    display: flex;
    align-items: center;
    flex-shrink: 0;
    text-decoration: none;
}

.site-header .site-logo img {
    display: block;
    width: auto;
    height: 50px;
    max-width: 190px;
    max-height: 50px;
    object-fit: contain;
}

/* =========================================================
   NAV MENU
========================================================= */
.nav-menu {
    display: flex;
    align-items: center;
    gap: 2px;
    margin-left: auto;
}

/* =========================================================
   NAV LINKS
========================================================= */
.nav-link,
.nav-dropdown-toggle {
    position: relative;
    display: inline-flex;
    align-items: center;
    gap: 5px;
    padding: 34px 12px;
    color: #ffffff !important;
    background: transparent;
    font-size: 13.5px !important;
    font-weight: 700 !important;
    letter-spacing: 0.35px;
    line-height: 1;
    text-decoration: none !important;
    white-space: nowrap;
    transition: color 0.25s ease;
}

.site-header .nav-link,
.site-header .nav-dropdown-toggle {
    color: #ffffff !important;
    font-size: 13.5px !important;
    font-weight: 700 !important;
}

.site-header .nav-link:hover,
.site-header .nav-dropdown-toggle:hover {
    color: var(--ip-light-blue) !important;
}

.site-header .nav-link.active,
.site-header .nav-dropdown-toggle.active {
    color: var(--ip-light-blue) !important;
}

/* =========================================================
   NAV ACTIVE LINE
========================================================= */
.nav-link::after,
.nav-dropdown-toggle::after {
    content: "";
    position: absolute;
    left: 12px;
    right: 12px;
    bottom: 21px;
    height: 2px;
    background: var(--ip-light-blue);
    transform: scaleX(0);
    transform-origin: center;
    transition: transform 0.25s ease;
}

.nav-link:hover::after,
.nav-link.active::after,
.nav-dropdown-toggle:hover::after,
.nav-dropdown-toggle.active::after {
    transform: scaleX(1);
}

/* =========================================================
   DROPDOWN
========================================================= */
.nav-dropdown {
    position: relative;
}

.dropdown-arrow {
    display: inline-block;
    margin-top: -2px;
    font-size: 13px;
    color: currentColor;
    transition: transform 0.25s ease;
}

.nav-dropdown:hover .dropdown-arrow {
    transform: rotate(180deg);
}

/* =========================================================
   DROPDOWN MENU
========================================================= */
.nav-dropdown-menu {
    position: absolute;
    top: calc(100% - 5px);
    left: 0;
    width: 210px;
    padding: 9px 0;
    background: #ffffff;
    border: 1px solid rgba(6, 59, 82, 0.10);
    box-shadow: 0 18px 45px rgba(3, 43, 60, 0.12);
    opacity: 0;
    visibility: hidden;
    transform: translateY(8px);
    transition:
        opacity 0.25s ease,
        visibility 0.25s ease,
        transform 0.25s ease;
}

.nav-dropdown:hover .nav-dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.nav-dropdown-menu a {
    display: block;
    padding: 12px 19px;
    color: var(--ip-navy) !important;
    background: #ffffff;
    font-size: 13.5px;
    font-weight: 600;
    line-height: 1.3;
    text-decoration: none !important;
    transition:
        color 0.2s ease,
        background 0.2s ease,
        padding-left 0.2s ease;
}

.nav-dropdown-menu a:hover {
    color: var(--ip-light-blue) !important;
    background: var(--ip-off-white);
    padding-left: 24px;
}

/* =========================================================
   CTA
========================================================= */
.nav-cta {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    margin-left: 20px;
    padding: 14px 18px;
    background: var(--ip-teal);
    border: 1px solid var(--ip-teal);
    color: #ffffff !important;
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.4px;
    line-height: 1;
    text-decoration: none !important;
    white-space: nowrap;
    transition:
        background 0.25s ease,
        border-color 0.25s ease,
        color 0.25s ease,
        transform 0.25s ease;
}

.site-header .nav-cta {
    color: #ffffff !important;
}

.nav-cta:hover {
    background: var(--ip-light-blue);
    border-color: var(--ip-light-blue);
    color: var(--ip-navy-dark) !important;
    transform: translateY(-2px);
}

.nav-cta-arrow {
    font-size: 15px;
    line-height: 1;
}

/* =========================================================
   MOBILE MENU BUTTON
========================================================= */
.mobile-menu-toggle {
    display: none;
    width: 44px;
    height: 44px;
    margin-left: auto;
    padding: 8px;
    border: 0;
    outline: none;
    background: transparent;
    cursor: pointer;
}

.mobile-menu-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    margin: 5px auto;
    background: #ffffff;
    transition:
        transform 0.25s ease,
        opacity 0.25s ease;
}

.mobile-menu-toggle.active span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

.mobile-menu-toggle.active span:nth-child(2) {
    opacity: 0;
}

.mobile-menu-toggle.active span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

/* =========================================================
   SCROLLED HEADER
========================================================= */
.site-header.scrolled .main-nav {
    background: var(--ip-navy-dark);
    box-shadow: 0 8px 30px rgba(3, 43, 60, 0.25);
}

/* =========================================================
   HOME HEADER
========================================================= */
.home-header .main-nav {
    background: rgba(3, 43, 60, 0.85);
    border-bottom-color: rgba(255, 255, 255, 0.14);
}

.home-header .nav-link,
.home-header .nav-dropdown-toggle {
    color: #ffffff !important;
}

.home-header .nav-link:hover,
.home-header .nav-link.active,
.home-header .nav-dropdown-toggle:hover,
.home-header .nav-dropdown-toggle.active {
    color: var(--ip-light-blue) !important;
}

.home-header .dropdown-arrow {
    color: #ffffff;
}

.home-header .nav-link:hover .dropdown-arrow {
    color: var(--ip-light-blue);
}

.home-header .nav-cta {
    background: var(--ip-teal);
    border-color: var(--ip-teal);
}

.home-header .nav-cta:hover {
    background: var(--ip-light-blue);
    border-color: var(--ip-light-blue);
    color: var(--ip-navy-dark) !important;
}

/* =========================================================
   HOME HEADER AFTER SCROLL
========================================================= */
.home-header.scrolled .main-nav {
    background: var(--ip-navy-dark);
    border-bottom-color: rgba(255, 255, 255, 0.12);
    box-shadow: 0 8px 30px rgba(3, 43, 60, 0.25);
}

.home-header.scrolled .nav-link,
.home-header.scrolled .nav-dropdown-toggle {
    color: #ffffff !important;
}

.home-header.scrolled .nav-link:hover,
.home-header.scrolled .nav-link.active,
.home-header.scrolled .nav-dropdown-toggle:hover,
.home-header.scrolled .nav-dropdown-toggle.active {
    color: var(--ip-light-blue) !important;
}

.home-header.scrolled .dropdown-arrow {
    color: #ffffff;
}

.home-header .site-logo img {
    display: block;
}

/* =========================================================
   RESPONSIVE — TABLET
========================================================= */
@media (max-width: 1100px) {
    .nav-container {
        width: min(100% - 35px, 1200px);
    }

    .nav-link,
    .nav-dropdown-toggle {
        padding-left: 9px;
        padding-right: 9px;
    }

    .nav-link::after,
    .nav-dropdown-toggle::after {
        left: 9px;
        right: 9px;
    }

    .nav-cta {
        margin-left: 10px;
        padding-left: 14px;
        padding-right: 14px;
    }
}

/* =========================================================
   RESPONSIVE — SMALL TABLET
========================================================= */
@media (max-width: 950px) {
    .nav-link,
    .nav-dropdown-toggle {
        font-size: 13px !important;
    }

    .nav-cta {
        display: none;
    }
}

/* =========================================================
   RESPONSIVE — MOBILE
========================================================= */
@media (max-width: 850px) {
    .nav-container {
        min-height: 76px;
    }

    .site-header .site-logo img {
        height: 44px;
        max-height: 44px;
        max-width: 175px;
    }

    .mobile-menu-toggle {
        display: block;
    }

    .nav-menu {
        position: absolute;
        top: 76px;
        left: 0;
        right: 0;
        display: flex;
        flex-direction: column;
        align-items: stretch;
        gap: 0;
        margin: 0;
        padding: 10px 25px 25px;
        background: var(--ip-navy-dark);
        border-top: 1px solid rgba(255, 255, 255, 0.12);
        box-shadow: 0 18px 40px rgba(3, 43, 60, 0.25);
        opacity: 0;
        visibility: hidden;
        transform: translateY(-10px);
        transition:
            opacity 0.25s ease,
            visibility 0.25s ease,
            transform 0.25s ease;
    }

    .nav-menu.active {
        opacity: 1;
        visibility: visible;
        transform: translateY(0);
    }

    .nav-link,
    .nav-dropdown-toggle,
    .home-header .nav-link,
    .home-header .nav-dropdown-toggle,
    .home-header.scrolled .nav-link,
    .home-header.scrolled .nav-dropdown-toggle {
        width: 100%;
        padding: 16px 5px;
        color: #ffffff !important;
        border-bottom: 1px solid rgba(255, 255, 255, 0.10);
        font-size: 14px !important;
    }

    .nav-link:hover,
    .nav-link.active,
    .nav-dropdown-toggle:hover,
    .nav-dropdown-toggle.active,
    .home-header .nav-link:hover,
    .home-header .nav-link.active,
    .home-header .nav-dropdown-toggle:hover,
    .home-header .nav-dropdown-toggle.active {
        color: var(--ip-light-blue) !important;
    }

    .nav-link::after,
    .nav-dropdown-toggle::after {
        display: none;
    }

    /* About submenu always expanded on mobile */
    .nav-dropdown-menu {
        position: static;
        width: 100%;
        display: block;
        padding: 0 0 8px;
        border: 0;
        box-shadow: none;
        opacity: 1;
        visibility: visible;
        transform: none;
        background: rgba(0, 0, 0, 0.15);
    }

    .nav-dropdown .dropdown-arrow {
        display: none;
    }

    .nav-dropdown-menu a {
        padding: 12px 20px 12px 28px;
        color: #ffffff !important;
        background: transparent;
        font-size: 13.5px;
        border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    }

    .nav-dropdown-menu a:hover {
        padding-left: 32px;
        background: rgba(255, 255, 255, 0.08);
        color: var(--ip-light-blue) !important;
    }

    .home-header .main-nav {
        background: rgba(3, 43, 60, 0.90);
    }

    .home-header .nav-menu {
        background: var(--ip-navy-dark);
    }
}

/* =========================================================
   RESPONSIVE — PHONE
========================================================= */
@media (max-width: 576px) {
    .nav-container {
        width: calc(100% - 30px);
    }

    .site-header .site-logo img {
        height: 40px;
        max-height: 40px;
        max-width: 160px;
    }
}

/* =========================================================
   REDUCED MOTION
========================================================= */
@media (prefers-reduced-motion: reduce) {
    .main-nav,
    .nav-link,
    .nav-link::after,
    .nav-dropdown-menu,
    .nav-cta,
    .mobile-menu-toggle span {
        transition: none;
    }
}