/**
 * Header & Navigation Styles
 * @version 2.0.0
 * @description Fixed Header with Single-line Navigation
 * @updated 2026-01-05
 */

/* ============================================
   Header Container
   ============================================ */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: var(--color-primary);
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.15);
    z-index: 1000;
}

/* ============================================
   Navigation Bar
   ============================================ */
.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    max-width: var(--container-lg);
    margin-inline: auto;
    padding: 0 var(--spacing-md);
    height: 70px;
    position: relative;
}

/* ============================================
   Logo
   ============================================ */
.nav__logo {
    display: flex;
    align-items: center;
    flex-shrink: 0;
}

.nav__logo img {
    height: 50px;
    width: auto;
    object-fit: contain;
    filter: brightness(0) invert(1);
    transition: opacity var(--transition-fast);
}

.nav__logo:hover img {
    opacity: 0.85;
}

/* ============================================
   Navigation Menu
   ============================================ */
.nav__menu {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 0;
    flex: 1;
    padding: 0;
    margin: 0;
    list-style: none;
}

.nav__menu > li {
    position: relative;
}

.nav__menu > li > a {
    display: block;
    padding: 0 clamp(12px, 2vw, 24px);
    line-height: 70px;
    color: white;
    text-decoration: none;
    font-size: 16px;
    transition: background var(--transition-fast);
    position: relative;
}

.nav__menu > li > a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 3px;
    background: #f7c532;
    transition: width var(--transition-normal);
}

.nav__menu > li:hover > a::after,
.nav__menu > li.active > a::after {
    width: 64px;
}

.nav__menu > li:hover > a,
.nav__menu > li.active > a {
    background: var(--color-primary-hover);
}

/* ============================================
   Submenu (Desktop)
   ============================================ */
.nav__menu > li > ul {
    position: absolute;
    top: 100%;
    left: 0;
    min-width: 180px;
    padding: 8px 0;
    margin: 0;
    list-style: none;
    background: var(--color-primary-hover);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    border-top: 2px solid #374151;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: all var(--transition-fast);
    z-index: 101;
}

.nav__menu > li > ul:empty {
    display: none !important;
}

.nav__menu > li:hover > ul:not(:empty) {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.nav__menu > li > ul li {
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.nav__menu > li > ul li:last-child {
    border-bottom: none;
}

.nav__menu > li > ul a {
    display: block;
    padding: 12px 20px;
    color: white;
    text-decoration: none;
    font-size: 14px;
    text-align: center;
    white-space: nowrap;
    transition: background var(--transition-fast);
}

.nav__menu > li > ul a:hover {
    background: var(--color-primary);
}

/* ============================================
   Mobile Toggle Button
   ============================================ */
.nav__toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 5px;
    width: 44px;
    height: 44px;
    padding: 8px;
    background: rgba(255, 255, 255, 0.1);
    border: none;
    border-radius: 8px;
    cursor: pointer;
    flex-shrink: 0;
    margin-left: var(--spacing-sm);
    transition: background var(--transition-fast);
}

.nav__toggle:hover {
    background: rgba(255, 255, 255, 0.2);
}

.nav__toggle-bar {
    display: block;
    width: 22px;
    height: 2px;
    background: white;
    border-radius: 1px;
    transition: all var(--transition-fast);
}

.nav__toggle[aria-expanded="true"] .nav__toggle-bar:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.nav__toggle[aria-expanded="true"] .nav__toggle-bar:nth-child(2) {
    opacity: 0;
}

.nav__toggle[aria-expanded="true"] .nav__toggle-bar:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* ============================================
   Mobile Backdrop
   ============================================ */
.nav__backdrop {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 998;
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.nav__backdrop.is-visible {
    opacity: 1;
}

/* ============================================
   Body Padding for Fixed Header
   ============================================ */
body {
    padding-top: 70px;
}

/* ============================================
   Scroll Animations
   ============================================ */
[data-animate] {
    opacity: 0;
    transition: opacity 0.6s ease, transform 0.6s ease;
}

[data-animate].is-visible {
    opacity: 1;
}

[data-animate="fade-up"] {
    transform: translateY(30px);
}

[data-animate="fade-up"].is-visible {
    transform: translateY(0);
}

[data-animate="fade-left"] {
    transform: translateX(-30px);
}

[data-animate="fade-left"].is-visible {
    transform: translateX(0);
}

[data-animate="fade-right"] {
    transform: translateX(30px);
}

[data-animate="fade-right"].is-visible {
    transform: translateX(0);
}

[data-animate="zoom-in"] {
    transform: scale(0.9);
}

[data-animate="zoom-in"].is-visible {
    transform: scale(1);
}