/**
 * Header Styles
 * Naphtha Plastics website header, navigation, and mobile menu
 */

/* ==========================================================================
   CSS Custom Properties (Design Tokens)
   ========================================================================== */
:root {
    /* Colors */
    --color-primary: #fbc02d;
    --color-dark: #222326;
    --color-dark-secondary: #100030;
    --color-white: #fff;
    --color-link: purple;

    /* Transparency variants */
    --color-white-80: hsla(0, 0%, 100%, 0.8);
    --color-white-20: hsla(0, 0%, 100%, 0.2);
    --color-white-10: hsla(0, 0%, 100%, 0.1);
    --color-white-04: hsla(0, 0%, 100%, 0.04);
    --color-dark-shadow: rgba(34, 35, 38, 0.05);

    /* Typography */
    --font-family: helvetica;
    --font-size-base: 1rem;
    --font-size-small: 0.89rem;
    --font-size-xsmall: 0.8rem;
    --line-height: 1.56;

    /* Spacing */
    --spacing-xs: 0.46rem;
    --spacing-sm: 0.56rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.2rem;
    --spacing-xl: 2rem;
    --spacing-section: 50px;
    --container-width: 1400px;
    --container-padding: 50px;

    /* Borders */
    --radius-sm: 4px;
    --radius-md: 10px;
    --radius-lg: 12px;

    /* Transitions */
    --transition-fast: 0.1s ease-in-out;
    --transition-normal: 0.2s ease-in-out;
    --transition-slow: 0.3s ease-out;

    /* Z-index layers */
    --z-sticky: 6;
    --z-overlay: 7;
    --z-popup: 8;
}

/* ==========================================================================
   Base Reset & Typography
   ========================================================================== */
*,
*::before,
*::after {
    box-sizing: border-box;
}

html {
    font-size: 112.5%; /* 18px base */
}

body {
    margin: 0;
    background: var(--color-white);
    color: var(--color-dark-secondary);
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    font-weight: 400;
    line-height: var(--line-height);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

a {
    color: var(--color-link);
    text-decoration: none;
    cursor: pointer;
}

a:hover {
    color: var(--color-primary);
    text-decoration: underline;
}

img,
svg {
    max-width: 100%;
    height: auto;
    vertical-align: middle;
}

ul {
    list-style: none;
    margin: 0;
    padding: 0;
}

.small-text {
    font-size: var(--font-size-small);
}

.screen-reader-text {
    clip: rect(1px, 1px, 1px, 1px);
    height: 1px;
    overflow: hidden;
    position: absolute !important;
    width: 1px;
}

/* ==========================================================================
   Layout Utilities
   ========================================================================== */
.section {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    padding: 96px 0;
    position: relative;
}

.container {
    display: flex;
    flex-direction: column;
    align-items: stretch;
    width: 1400px;
    max-width: 100%;
    padding: 0 50px;
}

.row {
    display: flex;
    flex-wrap: wrap;
    align-items: flex-start;
    margin: 0 -25px;
}

.col {
    display: flex;
    flex-direction: column;
    align-items: stretch;
    flex-shrink: 0;
    padding: 0 25px;
}

/* Grid columns - exact values from original */
.s3  { width: 25%; }
.s9  { width: 75%; }
.s12 { width: 100%; }

@media (max-width: 1139px) {
    .md-s3 { width: 25%; }
    .md-s9 { width: 75%; }
}

@media (max-width: 767px) {
    .col { width: 100%; }
    .sm-s4  { width: 33.33333333333333%; }
    .sm-s8  { width: 66.66666666666666%; }
    .sm-s12 { width: 100%; }
}

/* Flexbox utilities */
.flex            { display: flex; }
.flex-row        { flex-direction: row; }
.items-center    { align-items: center; }
.justify-between { justify-content: space-between; }
.justify-end     { justify-content: flex-end; }
.justify-center  { justify-content: center; }
.wrap            { flex-wrap: wrap; }
.no-shrink > *   { flex-shrink: 0; }

@media (max-width: 1139px) {
    .md-justify-end { justify-content: flex-end; }
}

.inline-items {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: flex-start;
}

.inline-items--left  { justify-content: flex-start; }
.inline-items--right { justify-content: flex-end; }

/* Module wrapper */
.module {
    display: flex;
    flex-direction: column;
    align-items: stretch;
}

.module__inner {
    width: 100%;
    max-width: 100%;
}

/* ==========================================================================
   Buttons
   ========================================================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0;
    border: none;
    background: none;
    font-family: var(--font-family);
    font-weight: 500;
    line-height: var(--line-height);
    text-align: center;
    text-decoration: none;
    vertical-align: middle;
    cursor: pointer;
    user-select: none;
    appearance: none;
    outline: none;
    overflow: hidden;
    position: relative;
    transform: scale(1);
    transition: transform var(--transition-fast);
}

.btn:hover {
    transform: scale(1.07);
    text-decoration: none;
}

.btn:active {
    transform: scale(0.93);
    transition-duration: 0.05s;
}

.btn--medium {
    padding: 0.64rem 0.91rem;
    border-radius: var(--radius-md);
    font-size: var(--font-size-small);
}

.btn--fill.btn--accent,
.btn--fill.btn--custom-color.btn--header-primary {
    background: var(--color-primary);
    color: var(--color-white);
}

/* ==========================================================================
   Icons
   ========================================================================== */
.icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    vertical-align: middle;
}

.icon img,
.icon svg {
    width: 100%;
    height: 100%;
    text-align: center;
    vertical-align: top;
}

.icon svg {
    fill: currentColor;
}

.icon--small .icon__glyph {
    width: 0.91rem;
    height: 0.91rem;
    font-size: 0.91rem;
    line-height: 0.91rem;
}

.icon--primary,
.icon--accent {
    color: var(--color-primary);
}

.ui-icon {
    display: flex;
    align-items: center;
    justify-content: center;
}

.ui-icon svg {
    display: block;
    width: 1.11rem;
    height: 1.11rem;
    pointer-events: none;
}

/* ==========================================================================
   Properties (Contact Info)
   ========================================================================== */
.properties {
    display: inline-block;
}

.properties__item {
    display: inline-flex;
    align-items: center;
    margin: 25px 0;
    text-align: start;
    vertical-align: middle;
}

.properties__item:not(:last-child) {
    margin-inline-end: var(--spacing-section);
    padding-inline-end: var(--spacing-section);
    border-inline-end: 1px solid;
}

a.properties__item,
a.properties__item .properties__text,
a.properties__item:hover {
    text-decoration: none;
}

a.properties__item:hover .properties__text {
    text-decoration: underline;
}

.properties__icon {
    flex-shrink: 0;
    margin-inline-end: var(--spacing-xs);
    line-height: 0;
}

.properties--always-stack .properties__item {
    display: flex;
    margin-inline-end: 0;
    padding-inline-end: 0;
    border-inline-end: none;
}

/* Properties in header (dark background) */
.header .properties__item {
    color: var(--color-white);
    border-color: var(--color-white-20);
}

.header a.properties__item:hover {
    color: var(--color-white);
}

/* ==========================================================================
   Animations
   ========================================================================== */
@keyframes sticky-header-active {
    from {
        opacity: 0;
        transform: scale(1.1) translateY(-50%);
    }
    to {
        opacity: 1;
        transform: scale(1) translateY(0);
    }
}

@keyframes sticky-header-inactive {
    from { transform: translateY(20%); }
    to   { transform: translateY(0); }
}

@keyframes ui-pop {
    from {
        opacity: 0;
        transform: scale(0.9) translateZ(0);
    }
    to {
        opacity: 1;
        transform: scale(1) translateZ(0);
    }
}

@keyframes overlay-fade {
    from { opacity: 0; }
    to   { opacity: 0.5; }
}

@keyframes slide-in-right {
    from {
        opacity: 0;
        transform: translateX(100%);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

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

/* ==========================================================================
   Header
   ========================================================================== */
.header {
    background: var(--color-dark);
}

/* Top bar (contact info) */
.header__section--top {
    padding-top: 0.56rem;
    padding-bottom: 0.56rem;
    border-bottom: 1px solid var(--color-white-20);
}

.header__section--top .container {
    flex-direction: row;
}

.header__contact-item {
    display: inline-flex;
    align-items: center;
    gap: 0.46rem;
    color: #fff;
    font-size: 0.8rem;
    text-decoration: none;
}

.header__contact-item:hover {
    color: #fff;
    text-decoration: underline;
}

.header__contact-item:not(:last-child) {
    margin-inline-end: 1.4rem;
    padding-inline-end: 1.4rem;
    border-inline-end: 1px solid hsla(0, 0%, 100%, 0.2);
}

.header__contact-icon {
    width: 0.91rem;
    height: 0.91rem;
    fill: #fbc02d;
}

/* Main header section */
.header__section--main {
    padding-top: 0;
    padding-bottom: 0;
    background: var(--color-dark);
}

.header__section--main .header__center {
    padding-top: 1rem;
    padding-bottom: 1rem;
    position: relative;
}

/* Logo */
.header__logo {
    display: block;
    line-height: 0;
}

.header__logo img {
    width: auto;
    max-width: 100%;
    height: auto;
}

/* CTA button */
.header__cta {
    margin-inline-start: 2rem;
}

/* Mobile nav toggle - hidden by default on desktop */
.header__mobile-nav {
    display: none;
    align-items: center;
    justify-content: center;
    padding: 0;
    background: none;
    border: none;
    color: #fff;
    cursor: pointer;
}

.header__mobile-nav svg {
    display: block;
}

/* ==========================================================================
   Overlap Header (hero banner extends behind nav)
   ========================================================================== */
.header--overlap {
    position: absolute;
    left: 0;
    right: 0;
    top: 0;
    z-index: var(--z-sticky);
}

.header--overlap:not(.header--sticky-active),
.header--overlap:not(.header--sticky-active) .header__section--main {
    background: none;
}

/* ==========================================================================
   Sticky Header
   ========================================================================== */
.header--sticky-inactive .header__section--main {
    animation: sticky-header-inactive var(--transition-normal);
}

.header--sticky-active .header__sticky-element {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: var(--z-sticky);
}

.header--sticky-active .header__section--main {
    animation: sticky-header-active var(--transition-normal);
    box-shadow:
        0 8px 16px var(--color-dark-shadow),
        0 4px 8px var(--color-dark-shadow);
}

.header--sticky-active .header__section--main .header__center {
    padding-top: 0.5rem;
    padding-bottom: 0.5rem;
}

/* Logo switching for sticky state */
.header--sticky-active .header__logo__static,
.header--sticky:not(.header--sticky-active) .header__logo__sticky {
    display: none;
}

/* ==========================================================================
   Desktop Navigation
   ========================================================================== */
.nav {
    position: relative;
}

.nav__list {
    list-style: none;
    margin: 0;
    padding: 0;
}

.nav__item,
.nav__link {
    position: relative;
}

.nav__link {
    display: block;
    padding: var(--spacing-sm) 0;
    color: var(--color-white);
    text-decoration: none;
}

.nav__link:hover {
    color: var(--color-white);
    text-decoration: none;
}

/* Level 1 navigation */
.nav__list--level1 {
    display: inline-flex;
    flex-wrap: wrap;
    align-items: center;
}

.nav__list--level1 > li:not(:last-child) {
    margin-inline-end: 2rem;
}

/* Underline indicator */
.nav__list--level1 > li > a::before {
    content: "";
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--color-primary);
    border-radius: var(--radius-sm);
    opacity: 0;
    transform: scaleX(0.2) translateY(2px) translateZ(0);
    transition: var(--transition-slow);
}

.nav__list--level1 > li:hover > a::before,
.nav__list--level1 > .nav__item--active > a::before,
.nav__list--level1 > .nav__item--active-branch > a::before,
.nav__list--level1 > .nav__item--expanded > a::before {
    opacity: 1;
    transform: scale(1) translateY(0) translateZ(0);
}

/* Flyout dropdown */
.nav__list--flyout {
    position: absolute;
    width: 0;
    height: 0;
    padding: 10px 0;
    background-color: var(--color-dark);
    border-radius: var(--radius-lg);
    box-shadow:
        0 32px 64px var(--color-dark-shadow),
        0 16px 32px var(--color-dark-shadow);
    opacity: 0;
    overflow: hidden;
    z-index: var(--z-sticky);
}

.nav--on-hover li:hover > .nav__list--flyout {
    width: 220px;
    height: auto;
    opacity: 1;
    overflow: visible;
    animation: ui-pop var(--transition-normal) forwards;
}

.nav__list--flyout a {
    padding: var(--spacing-sm) 1.11rem;
    font-size: var(--font-size-small);
}

.nav__list--flyout li:not(:first-child) > a {
    border-top: 1px solid var(--color-white-20);
}

.nav__list--flyout li:hover > a,
.nav__list--flyout .nav__item--active > a,
.nav__list--flyout .nav__item--active-branch > a {
    background-color: var(--color-white-10);
    color: var(--color-white);
}

.nav__list--flyout .nav__item--active > a,
.nav__list--flyout .nav__item--active-branch > a {
    font-weight: 600;
}

.nav__list--flyout .nav__item--active-branch > a:before,
.nav__list--flyout .nav__item--active > a:before {
  background: #fbc02d;
  border-radius: 4px;
  content: "";
  display: block;
  height: 4px;
  left: .44rem;
  margin-top: -2px;
  position: absolute;
  top: 50%;
  width: 4px;
}

.nav__list--level2 {
    top: 100%;
    margin-inline-start: -20px;
}

/* ==========================================================================
   Mobile Navigation
   ========================================================================== */
.mnav {
    display: flex;
}

/* Hamburger button */
.mnav__open,
.mnav__open:hover {
    color: var(--color-white);
    text-decoration: none;
}

/* Overlay */
.mnav__overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: var(--color-dark);
    z-index: var(--z-overlay);
}

.mnav-active .mnav__overlay {
    display: block;
    animation: overlay-fade var(--transition-normal) forwards;
}

/* Slide-out panel */
.mnav__popup {
    display: none;
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    width: 100%;
    max-width: 400px;
    padding-top: calc(100px + 1.11rem);
    background: #222326;
    box-shadow: -32px 0 64px rgba(34, 35, 38, 0.05), -16px 0 32px rgba(34, 35, 38, 0.05);
    overflow-x: hidden;
    overflow-y: auto;
    z-index: 8;
}

.mnav-active .mnav__popup {
    display: flex;
    flex-direction: column;
    align-items: stretch;
    animation: slide-in-right var(--transition-normal) forwards;
}

/* Close button */
.mnav__close {
    position: absolute;
    top: 50px;
    right: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0;
    background: none;
    border: none;
    color: #fff;
    cursor: pointer;
}

.mnav__close:hover {
    color: var(--color-white);
}

/* Sections within popup */
.mnav__section {
    padding: 50px;
    border-bottom: 1px solid hsla(0, 0%, 100%, 0.2);
}

.mnav__section--last,
.mnav__menu {
    border-bottom: none;
}

.mnav__menu {
    padding: 0;
    text-align: start;
}

/* Menu list */
.mnav__menu__list {
    list-style: none;
    margin: 0;
    padding: 0;
}

.mnav__menu__item {
    position: relative;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    padding: 0 50px;
}

.mnav__menu__item:not(:first-child) {
    border-top: 1px solid var(--color-white-20);
}

/* Menu links */
.mnav__menu__link {
    display: block;
    flex: 1;
    padding: 0.83rem 0;
    color: var(--color-white);
    text-decoration: none;
    position: relative;
}

.mnav__menu__link:hover {
    color: var(--color-white);
    text-decoration: none;
}

/* Active state */
.mnav__menu__item--active > .mnav__menu__link,
.mnav__menu__item--active-branch > .mnav__menu__link {
    font-weight: 600;
}

.mnav__menu__item--active > .mnav__menu__link::before,
.mnav__menu__item--active-branch > .mnav__menu__link::before {
    content: "";
    position: absolute;
    top: 50%;
    left: -0.67rem;
    width: 4px;
    height: 4px;
    margin-top: -2px;
    background: var(--color-primary);
    border-radius: var(--radius-sm);
}

/* Toggle button */
.mnav__menu__toggle {
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    padding: 0;
    background: none;
    border: none;
    color: var(--color-white);
    cursor: pointer;
}

.mnav__menu__toggle-icon {
    transition: transform var(--transition-normal);
}

.mnav__menu__item--expanded > .mnav__menu__toggle .mnav__menu__toggle-icon {
    transform: rotate(180deg);
}

/* Child submenu */
.mnav__menu__child {
    display: none;
    width: 100%;
    list-style: none;
    margin: 0;
    padding: 0 0 0.5rem 0;
}

.mnav__menu__item--expanded > .mnav__menu__child {
    display: block;
    animation: menu-expand var(--transition-normal) forwards;
}

.mnav__menu__item--expanded {
    background-color: var(--color-white-04);
    box-shadow:
        0 8px 16px var(--color-dark-shadow),
        0 4px 8px var(--color-dark-shadow);
}

.mnav__menu__child a {
    display: block;
    padding: 0.5rem 0;
    color: var(--color-white-80);
    font-size: var(--font-size-small);
    text-decoration: none;
}

.mnav__menu__child a:hover {
    color: var(--color-primary);
}

/* CTA button in mobile popup */
.mnav__cta {
    align-self: flex-start;
    margin: 50px;
    padding: 1.2rem 0.91rem;
}

/* Contact section in mobile popup */
.mnav__contact {
    padding: 50px;
    border-top: 1px solid var(--color-white-20);
}

.mnav__contact-item {
    display: flex;
    align-items: center;
    gap: 0.46rem;
    color: var(--color-white);
    font-size: 0.8rem;
    text-decoration: none;
}

.mnav__contact-item:not(:last-child) {
    margin-bottom: 1rem;
}

.mnav__contact-item:hover {
    color: var(--color-white);
    text-decoration: underline;
}

.mnav__contact-item svg {
    width: 0.91rem;
    height: 0.91rem;
    fill: var(--color-primary);
}

/* ==========================================================================
   Responsive Breakpoints
   ========================================================================== */

/* Tablet and below (≤1139px) */
@media (max-width: 1139px) {
    .header__contact > *,
    .header__nav {
        display: none;
    }

    .header__mobile-nav {
        display: block;
        margin-inline-start: 1.2rem;
    }

    .mnav-active {
        overflow: hidden;
    }
}

/* Mobile (≤767px) */
@media (max-width: 767px) {
    .header__cta,
    .header__section--top {
        display: none;
    }

    .mnav__popup {
        left: 0;
        max-width: none;
        width: auto;
    }

    .mnav-active .mnav__popup {
        animation: ui-pop var(--transition-normal) forwards;
    }
}