/* ========================================
   Header & Navigation
   ======================================== */

.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--header-height);
    z-index: var(--z-fixed);
    background: rgba(var(--bg-primary), 0.8);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-light);
    transition: background var(--transition-base);
}

.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

/* Logo */
.nav__logo,
.footer__logo {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    font-size: var(--fs-2xl);
    font-weight: var(--fw-bold);
}

.logo-text {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.logo-dot {
    width: 8px;
    height: 8px;
    background: var(--accent-primary);
    border-radius: 50%;
    animation: pulse-dot 2s ease-in-out infinite;
}

@keyframes pulse-dot {

    0%,
    100% {
        opacity: 1;
        transform: scale(1);
    }

    50% {
        opacity: 0.5;
        transform: scale(1.2);
    }
}

/* Navigation Menu */
.nav__menu {
    display: flex;
    align-items: center;
    gap: var(--space-xl);
}

.nav__list {
    display: flex;
    align-items: center;
    gap: var(--space-lg);
}

.nav__link {
    position: relative;
    font-size: var(--fs-sm);
    font-weight: var(--fw-medium);
    color: var(--text-secondary);
    padding: var(--space-sm) 0;
    transition: color var(--transition-fast);
}

.nav__link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    transition: width var(--transition-base);
}

.nav__link:hover,
.nav__link.active {
    color: var(--text-primary);
}

.nav__link.active::after,
.nav__link:hover::after {
    width: 100%;
}

/* Navigation Actions */
.nav__actions {
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

/* Language Switcher */
.lang-switcher {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    font-size: var(--fs-sm);
}

.lang-btn {
    padding: var(--space-xs) var(--space-sm);
    color: var(--text-tertiary);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.lang-btn:hover,
.lang-btn.active {
    color: var(--accent-primary);
    background: rgba(var(--accent-primary-rgb), 0.1);
}

.lang-divider {
    color: var(--text-tertiary);
}



/* Mobile Toggle */
.nav__toggle,
.nav__close {
    display: none;
    width: 40px;
    height: 40px;
    align-items: center;
    justify-content: center;
}

.nav__toggle svg,
.nav__close svg {
    width: 24px;
    height: 24px;
    color: var(--text-primary);
}

/* ========================================
   Main Content
   ======================================== */

.main {
    flex: 1;
    width: 100%;
}

/* ========================================
   Footer
   ======================================== */

.footer {
    padding: var(--space-3xl) 0 var(--space-xl);
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-light);
}

.footer__content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-bottom: var(--space-xl);
    border-bottom: 1px solid var(--border-light);
}

.footer__brand {
    display: flex;
    align-items: center;
    gap: var(--space-lg);
}

.footer__description {
    font-size: var(--fs-sm);
    color: var(--text-secondary);
}

.footer__social {
    display: flex;
    gap: var(--space-md);
}

.social__link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    background: var(--surface-glass);
    border: 1px solid var(--border-default);
    border-radius: var(--radius-full);
    transition: all var(--transition-base);
}

.social__link svg {
    width: 20px;
    height: 20px;
    color: var(--text-secondary);
    transition: color var(--transition-fast);
}

.social__link:hover {
    border-color: var(--accent-primary);
    transform: translateY(-3px);
}

.social__link:hover svg {
    color: var(--accent-primary);
}

.footer__bottom {
    padding-top: var(--space-xl);
    text-align: center;
}

/* ========================================
   Scroll to Top
   ======================================== */

.scroll-top {
    position: fixed;
    bottom: var(--space-xl);
    right: var(--space-xl);
    width: 44px;
    height: 44px;
    background: var(--surface-glass);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--surface-glass-border);
    border-radius: var(--radius-full);
    color: var(--text-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all var(--transition-base);
    z-index: var(--z-modal);
}

.scroll-top.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.scroll-top:hover {
    background: var(--surface-glass-hover);
    border-color: var(--accent-primary);
    color: var(--accent-primary);
    transform: translateY(-3px);
}

.scroll-top svg {
    width: 24px;
    height: 24px;
}

/* ========================================
   Error Page
   ======================================== */

.error-section {
    padding: var(--space-3xl) 0;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    min-height: 60vh;
}

.container--narrow {
    max-width: 800px;
}

.error-content {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.error-code {
    font-size: clamp(6rem, 15vw, 10rem);
    font-weight: var(--fw-bold);
    line-height: 1;
    margin-bottom: var(--space-sm);
    letter-spacing: -0.05em;
    background: linear-gradient(135deg, var(--text-primary), var(--text-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.error-code--not-found {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    background-clip: text;
}

.error-code--server {
    background: linear-gradient(135deg, var(--color-error), #dc2626);
    -webkit-background-clip: text;
    background-clip: text;
}

.error-title {
    font-size: var(--fs-3xl);
    font-weight: var(--fw-bold);
    margin-bottom: var(--space-md);
    color: var(--text-primary);
}

.error-message {
    font-size: var(--fs-lg);
    color: var(--text-secondary);
    margin-bottom: var(--space-xl);
    max-width: 600px;
    line-height: var(--lh-relaxed);
}

.error-uri-wrapper {
    margin-bottom: var(--space-xl);
}

.error-uri {
    background: rgba(255, 255, 255, 0.05);
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-sm);
    font-family: var(--font-mono);
    font-size: var(--fs-sm);
    color: var(--text-secondary);
    display: inline-block;
}

.error-validation {
    text-align: left;
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.2);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    margin-bottom: var(--space-xl);
    width: 100%;
    max-width: 600px;
}

.error-validation__header {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    margin-bottom: var(--space-md);
    color: var(--color-error);
}

.error-validation__header h5 {
    margin: 0;
    font-size: var(--fs-lg);
    font-weight: var(--fw-semibold);
}

.error-validation__list {
    margin: 0;
    padding-left: var(--space-lg);
    color: var(--text-secondary);
}

.error-validation__list li {
    margin-bottom: var(--space-xs);
}

.error-validation__list li:last-child {
    margin-bottom: 0;
}