/* ============================================
   V4 — LAYOUT
   Container, Header, Footer, Navigation
============================================ */

/* Container */
.container {
    max-width: 1300px;
    margin: 0 auto;
    padding: 0;
}

/* ============================================
   HEADER
============================================ */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 102;
    padding: 24px 32px;
    border-bottom: 1px solid transparent;
    transition: all 0.4s ease;
}

/* Header entrance animation - smooth fade only */
@keyframes headerFadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.brand {
    animation: headerFadeIn 0.8s ease-out 0.1s both;
}

.main-nav {
    animation: headerFadeIn 0.8s ease-out 0.2s both;
}

.main-nav a {
    animation: headerFadeIn 0.6s ease-out both;
}

.main-nav a:nth-child(1) { animation-delay: 0.15s; }
.main-nav a:nth-child(2) { animation-delay: 0.2s; }
.main-nav a:nth-child(3) { animation-delay: 0.25s; }
.main-nav a:nth-child(4) { animation-delay: 0.3s; }

.mode-toggle {
    animation: headerFadeIn 0.6s ease-out 0.25s both;
}

.lang-pill {
    animation: headerFadeIn 0.6s ease-out 0.35s both;
}

.nav-trigger {
    animation: headerFadeIn 0.6s ease-out 0.2s both;
}

/* Theme transition for all elements */
.site-header,
.site-header.scrolled,
.overlay-menu,
.solution-block,
.visual-card,
.principle,
.company-profile,
.cta-section,
.cta-form,
.site-footer,
.lang-pill,
.mode-toggle {
    transition: background-color 0.8s ease, border-color 0.8s ease, color 0.8s ease;
}

.site-header.scrolled {
    background: var(--bg-alt);
    border-bottom: 1px solid var(--border);
    padding: 16px 32px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
}

[data-theme="dark"] .site-header.scrolled {
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) .site-header.scrolled {
        box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
    }
}

.header-wrap {
    max-width: 1300px;
    margin: 0 auto;
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.brand img {
    height: 40px;
    transition: height 0.3s ease;
}

.brand.shrink img {
    height: 28px;
}

.main-nav {
    display: flex;
    gap: 40px;
}

.main-nav a {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-soft);
    transition: color 0.2s;
}

.main-nav a:hover {
    color: var(--text);
}

.header-controls {
    display: flex;
    align-items: center;
    gap: 12px;
}

.mode-toggle {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    border: 1px solid var(--border);
    background: var(--bg-alt);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    cursor: pointer;
    color: var(--text);
    transition: all 0.2s;
}

.mode-toggle:hover {
    border-color: var(--accent);
}

.mode-icon {
    display: none;
}

/* System theme (default) */
.mode-system { display: block; }

/* Light theme */
[data-theme="light"] .mode-system { display: none; }
[data-theme="light"] .mode-light { display: block; }

/* Dark theme */
[data-theme="dark"] .mode-system { display: none; }
[data-theme="dark"] .mode-dark { display: block; }

/* Language Pill */
.lang-pill {
    display: flex;
    align-items: center;
    background: var(--bg-alt);
    border: 1px solid var(--border);
    border-radius: 22px;
    padding: 4px;
    height: 44px;
}

.lang-btn {
    padding: 0 14px;
    background: transparent;
    border: none;
    border-radius: 18px;
    color: var(--text-soft);
    font-size: 0.75rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    white-space: nowrap;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.lang-btn:hover {
    color: var(--text);
}

.lang-btn.active {
    background: var(--accent);
    color: white;
}

.lang-btn.lang-hidden {
    width: 0;
    padding: 0;
    opacity: 0;
    overflow: hidden;
    transform: scale(0.85) translateX(-4px);
    transition: width 0.25s cubic-bezier(0.4, 0, 0.2, 1),
                padding 0.25s cubic-bezier(0.4, 0, 0.2, 1),
                opacity 0.2s ease-out,
                transform 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

/* JS adds .hover-active class after 200ms delay */
.lang-pill.hover-active .lang-btn.lang-hidden,
.lang-pill.expanded .lang-btn.lang-hidden {
    width: auto;
    padding: 0 14px;
    opacity: 1;
    transform: scale(1) translateX(0);
    transition: width 0.35s cubic-bezier(0.34, 1.56, 0.64, 1),
                padding 0.35s cubic-bezier(0.34, 1.56, 0.64, 1),
                opacity 0.3s ease-out,
                transform 0.35s cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* Staggered appearance */
.lang-pill.hover-active .lang-btn.lang-hidden:nth-child(2) {
    transition-delay: 0s;
}

.lang-pill.hover-active .lang-btn.lang-hidden:nth-child(3) {
    transition-delay: 0.05s;
}

.header-cta:hover {
    background: var(--accent-hover);
}

/* Nav Trigger - Modern Hamburger */
.nav-trigger {
    display: none;
    width: 48px;
    height: 48px;
    background: transparent;
    border: none;
    position: relative;
    margin-right: -12px;
    z-index: 102;
    cursor: pointer;
}

.nav-trigger span {
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    width: 22px;
    height: 2px;
    background: var(--text);
    border-radius: 2px;
    transition: all 0.3s ease;
}

.nav-trigger span::before,
.nav-trigger span::after {
    content: '';
    position: absolute;
    left: 0;
    width: 22px;
    height: 2px;
    background: var(--text);
    border-radius: 2px;
    transition: all 0.3s ease;
}

.nav-trigger span::before {
    top: -7px;
    width: 16px;
    left: auto;
    right: 0;
}

.nav-trigger span::after {
    top: 7px;
    width: 12px;
}

/* Hover effect - lines align */
.nav-trigger:hover span::before,
.nav-trigger:hover span::after {
    width: 22px;
}

/* Active state - X animation */
.nav-trigger.active span {
    background: transparent;
}

.nav-trigger.active span::before {
    width: 22px;
    transform: rotate(45deg);
    top: 0;
}

.nav-trigger.active span::after {
    width: 22px;
    transform: rotate(-45deg);
    top: 0;
}

/* Overlay Menu */
.overlay-menu {
    position: fixed;
    inset: 0;
    background: var(--bg);
    z-index: 101;
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: 100px 32px 32px;
    visibility: hidden;
    opacity: 0;
    transition: all 0.4s;
}

.overlay-menu.active {
    visibility: visible;
    opacity: 1;
}

.overlay-nav {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.overlay-nav a {
    font-size: 2.5rem;
    font-weight: 700;
    letter-spacing: -0.02em;
}

.overlay-info {
    margin-top: auto;
    padding-top: 48px;
    color: var(--text-soft);
}

.overlay-info a {
    font-size: 1.1rem;
    display: block;
    margin-bottom: 8px;
}

/* ============================================
   FOOTER
============================================ */
.site-footer {
    padding: 80px 32px 40px;
    border-top: 1px solid var(--border);
}

.footer-top {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 64px;
    margin-bottom: 64px;
}

.footer-brand img {
    height: 28px;
    margin-bottom: 16px;
}

.footer-brand p {
    font-size: 0.9rem;
    color: var(--text-soft);
    max-width: 250px;
}

.footer-nav {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

.footer-nav h5 {
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-muted);
    margin-bottom: 16px;
}

.footer-nav a,
.footer-nav span {
    display: block;
    font-size: 0.9rem;
    color: var(--text-soft);
    margin-bottom: 10px;
    transition: color 0.2s;
}

.footer-nav a:hover {
    color: var(--accent);
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    padding-top: 32px;
    border-top: 1px solid var(--border);
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* Language Dropdown (mobile) */
.lang-dropdown {
    display: none;
    position: relative;
}

.lang-dropdown-trigger {
    width: 44px;
    height: 44px;
    background: transparent;
    border: none;
    border-radius: 12px;
    color: var(--text);
    font-size: 1.2rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
}

.lang-dropdown-trigger:hover {
    color: var(--accent);
}

.lang-dropdown-menu {
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    background: var(--bg-alt);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 8px;
    min-width: 120px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px) scale(0.95);
    transform-origin: top right;
    transition: opacity 0.2s ease, visibility 0.2s ease, transform 0.25s cubic-bezier(0.34, 1.56, 0.64, 1);
    box-shadow: 0 4px 20px rgba(0,0,0,0.1);
}

.lang-dropdown.open .lang-dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0) scale(1);
}

.lang-dropdown-item {
    display: block;
    width: 100%;
    padding: 10px 14px;
    background: transparent;
    border: none;
    border-radius: 8px;
    color: var(--text-soft);
    font-size: 0.85rem;
    font-weight: 500;
    text-align: left;
    cursor: pointer;
    opacity: 0;
    transform: translateX(-8px);
    transition: background 0.2s ease, color 0.2s ease, opacity 0.2s ease, transform 0.25s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.lang-dropdown.open .lang-dropdown-item {
    opacity: 1;
    transform: translateX(0);
}

/* Staggered animation for dropdown items */
.lang-dropdown.open .lang-dropdown-item:nth-child(1) { transition-delay: 0.05s; }
.lang-dropdown.open .lang-dropdown-item:nth-child(2) { transition-delay: 0.1s; }
.lang-dropdown.open .lang-dropdown-item:nth-child(3) { transition-delay: 0.15s; }

.lang-dropdown-item:hover {
    background: var(--bg);
    color: var(--text);
}

.lang-dropdown-item.active {
    background: var(--accent);
    color: white;
}