/* ── Header ── */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    height: var(--header-height);
    background: rgba(5, 5, 8, 0.92);
    border-bottom: 1px solid transparent;
    transition: border-color var(--transition-fast);
}

.site-header.is-scrolled {
    border-bottom-color: var(--color-border);
}

.header-inner {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: flex-end;
    height: 100%;
    width: 100%;
    padding-right: var(--site-inset);
    gap: 1.5rem;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 1.25rem;
}

.lang-switcher {
    flex-shrink: 0;
}

.lang-switcher-track {
    position: relative;
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    align-items: center;
    min-width: 5.75rem;
    padding: 0.2rem;
    background:
        linear-gradient(145deg, rgba(255, 255, 255, 0.05) 0%, rgba(255, 255, 255, 0.02) 100%);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 999px;
    box-shadow:
        inset 0 1px 0 rgba(255, 255, 255, 0.06),
        0 4px 16px rgba(0, 0, 0, 0.18);
}

.lang-switcher-indicator {
    position: absolute;
    top: 0.2rem;
    left: 0.2rem;
    width: calc(50% - 0.2rem);
    height: calc(100% - 0.4rem);
    border-radius: 999px;
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.16) 0%, rgba(255, 255, 255, 0.07) 100%);
    border: 1px solid rgba(255, 255, 255, 0.14);
    box-shadow:
        0 2px 10px rgba(0, 0, 0, 0.22),
        inset 0 1px 0 rgba(255, 255, 255, 0.12);
    transition: transform 0.32s cubic-bezier(0.4, 0, 0.2, 1);
    pointer-events: none;
}

.lang-switcher-track[data-active="en"] .lang-switcher-indicator {
    transform: translateX(100%);
}

.lang-switcher-btn {
    position: relative;
    z-index: 1;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 2.65rem;
    padding: 0.42rem 0.55rem;
    font-size: 0.6875rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    color: rgba(255, 255, 255, 0.42);
    border: none;
    background: none;
    cursor: pointer;
    font-family: inherit;
    border-radius: 999px;
    transition: color var(--transition-fast);
}

.lang-switcher-btn:hover {
    color: rgba(255, 255, 255, 0.78);
}

.lang-switcher-btn.is-active {
    color: var(--color-heading);
}

.lang-switcher-btn:focus-visible {
    outline: 2px solid rgba(255, 255, 255, 0.35);
    outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
    .lang-switcher-indicator {
        transition: none;
    }
}

.logo {
    position: absolute;
    left: var(--site-inset);
    top: 50%;
    transform: translateY(-50%);
    display: inline-flex;
    align-items: center;
    gap: 0.65rem;
    font-size: clamp(1.125rem, 1.6vw, 1.5rem);
    font-weight: 700;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    line-height: 1;
    white-space: nowrap;
    z-index: 2;
}

.logo-mark {
    color: var(--color-heading);
}

.logo-sep {
    display: inline-block;
    width: 1px;
    height: 1.1em;
    margin: 0 0.7em;
    background: linear-gradient(180deg, transparent, rgba(255, 255, 255, 0.35), transparent);
    flex-shrink: 0;
}

.logo-accent {
    color: rgba(255, 255, 255, 0.5);
    font-weight: 500;
    letter-spacing: 0.18em;
}

.logo-img {
    display: block;
    height: clamp(1.5rem, 2.2vw, 1.75rem);
    width: auto;
    max-width: min(220px, 40vw);
    object-fit: contain;
    flex-shrink: 0;
}

.footer-logo .logo-img {
    height: 1.25rem;
    max-width: 180px;
}

.footer-logo {
    position: static;
    transform: none;
    font-size: 1.125rem;
}

.footer-logo .logo-sep {
    margin: 0 0.6em;
}

.main-nav {
    display: flex;
    align-items: center;
}

.nav-list {
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.nav-link {
    padding: 0.5rem 0.875rem;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-text-muted);
    border-radius: var(--radius-btn);
    transition: color var(--transition-fast), background var(--transition-fast);
}

.nav-link:hover,
.nav-link.is-active {
    color: var(--color-heading);
    background: rgba(255, 255, 255, 0.05);
}

.nav-link--cta {
    color: var(--color-bg-primary);
    background: var(--color-accent);
    margin-left: 0.5rem;
}

.nav-link--cta:hover {
    background: #FFFFFF;
    color: var(--color-bg-primary);
}

.nav-item-lang {
    display: flex;
    align-items: center;
    margin-left: 0.75rem;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 6px;
    width: 40px;
    height: 40px;
    padding: 8px;
}

.nav-toggle-bar {
    display: block;
    width: 100%;
    height: 1.5px;
    background: var(--color-heading);
    border-radius: 2px;
    transition: transform var(--transition-base), opacity var(--transition-base);
}

.nav-toggle.is-open .nav-toggle-bar:first-child {
    transform: translateY(3.75px) rotate(45deg);
}

.nav-toggle.is-open .nav-toggle-bar:last-child {
    transform: translateY(-3.75px) rotate(-45deg);
}

@media (max-width: 768px) {
    .header-inner {
        padding-right: var(--container-padding);
        gap: 0.75rem;
    }

    .header-actions {
        gap: 0.75rem;
    }

    .logo {
        left: var(--container-padding);
        font-size: 1rem;
        letter-spacing: 0.1em;
    }

    .logo-accent {
        letter-spacing: 0.14em;
    }

    .nav-toggle {
        display: flex;
    }

    .main-nav {
        position: fixed;
        top: var(--header-height);
        left: 0;
        right: 0;
        bottom: 0;
        background: rgba(5, 5, 8, 0.98);
        padding: 2rem var(--container-padding);
        transform: translateX(100%);
        opacity: 0;
        transition: transform var(--transition-base), opacity var(--transition-base);
        pointer-events: none;
    }

    .main-nav.is-open {
        transform: translateX(0);
        opacity: 1;
        pointer-events: auto;
    }

    .nav-list {
        flex-direction: column;
        align-items: stretch;
        gap: 0.5rem;
    }

    .nav-link {
        padding: 0.875rem 1rem;
        font-size: 1rem;
    }

    .nav-link--cta {
        margin-left: 0;
        text-align: center;
        margin-top: 1rem;
    }

    .nav-item-lang {
        margin-left: 0;
        margin-top: 1rem;
        justify-content: center;
    }
}

/* ── Badge ── */
.badge {
    display: inline-block;
    padding: 0.4rem 1rem;
    font-size: 0.6875rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: rgba(165, 180, 252, 0.9);
    background: rgba(99, 102, 241, 0.1);
    border: 1px solid rgba(129, 140, 248, 0.25);
    border-radius: var(--radius-badge);
    margin-bottom: 1.5rem;
}

/* ── Section Header ── */
.section-header {
    text-align: left;
    max-width: 680px;
    margin: 0 0 3.5rem;
}

.section-title {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: 600;
    letter-spacing: -0.02em;
    margin-bottom: 1rem;
}

.section-subtitle {
    font-size: 1.0625rem;
    color: var(--color-text-muted);
    line-height: 1.7;
}

.section-description {
    font-size: 1.0625rem;
    color: var(--color-text-muted);
    line-height: 1.7;
    margin-bottom: 2rem;
}

/* ── Card ── */
.card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-card);
    padding: 2rem;
    box-shadow: var(--shadow-card);
    transition: transform var(--transition-fast), border-color var(--transition-fast);
}

.card:hover {
    transform: translateY(-2px);
    border-color: rgba(255, 255, 255, 0.12);
}

.card-title {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 0.625rem;
}

.card-description {
    font-size: 0.9375rem;
    color: var(--color-text-muted);
    line-height: 1.65;
}

/* ── Buttons ── */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    font-size: 0.9375rem;
    font-weight: 500;
    border-radius: var(--radius-btn);
    transition: background var(--transition-fast), color var(--transition-fast), transform var(--transition-fast), opacity var(--transition-fast);
    white-space: nowrap;
}

.btn:active {
    transform: scale(0.98);
}

.btn-primary {
    color: var(--color-bg-primary);
    background: var(--color-accent);
}

.btn-primary:hover {
    background: #FFFFFF;
}

.btn-secondary {
    color: var(--color-heading);
    background: transparent;
    border: 1px solid var(--color-border);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: rgba(255, 255, 255, 0.15);
}

.btn-full {
    width: 100%;
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.btn-loader {
    width: 18px;
    height: 18px;
    border: 2px solid transparent;
    border-top-color: currentColor;
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* ── Form ── */
.form-group {
    margin-bottom: 1.25rem;
}

.form-group label {
    display: block;
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--color-text-muted);
    margin-bottom: 0.5rem;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.75rem 1rem;
    font-size: 0.9375rem;
    color: var(--color-heading);
    background: var(--color-bg-primary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-btn);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
    resize: vertical;
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: rgba(156, 163, 175, 0.5);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: rgba(255, 255, 255, 0.2);
    box-shadow: 0 0 0 3px rgba(255, 255, 255, 0.05);
}

.form-group input.is-error,
.form-group textarea.is-error {
    border-color: rgba(239, 68, 68, 0.5);
}

.form-error {
    display: block;
    font-size: 0.75rem;
    color: #EF4444;
    margin-top: 0.375rem;
    min-height: 1rem;
}

.form-status {
    margin-top: 1rem;
    padding: 0.75rem 1rem;
    font-size: 0.875rem;
    border-radius: var(--radius-btn);
    text-align: center;
}

.form-status.is-success {
    color: #34D399;
    background: rgba(52, 211, 153, 0.08);
    border: 1px solid rgba(52, 211, 153, 0.2);
}

.form-status.is-error {
    color: #F87171;
    background: rgba(248, 113, 113, 0.08);
    border: 1px solid rgba(248, 113, 113, 0.2);
}

/* ── Footer ── */
.site-footer {
    background: var(--color-bg-secondary);
    border-top: 1px solid var(--color-border);
    padding: 4rem 0 2rem;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 3rem;
    margin-bottom: 3rem;
}

.footer-tagline {
    margin-top: 1rem;
    font-size: 0.9375rem;
    color: var(--color-text-muted);
}

.footer-heading {
    font-size: 0.8125rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--color-text-muted);
    margin-bottom: 1.25rem;
}

.footer-links ul,
.footer-contact ul {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.footer-links a,
.footer-contact a {
    font-size: 0.9375rem;
    color: var(--color-text);
    transition: color var(--transition-fast);
}

.footer-links a:hover,
.footer-contact a:hover {
    color: var(--color-heading);
}

.footer-contact li {
    font-size: 0.9375rem;
    color: var(--color-text);
}

.footer-bottom {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: 2rem;
    border-top: 1px solid var(--color-border);
}

.footer-copy {
    font-size: 0.8125rem;
    color: var(--color-text-muted);
}

.footer-social {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.35rem;
}

.footer-social__link {
    display: inline-grid;
    place-items: center;
    width: 2.35rem;
    height: 2.35rem;
    border-radius: 999px;
    color: var(--color-text-muted);
    background: transparent;
    transition:
        color var(--transition-fast),
        background var(--transition-fast),
        transform var(--transition-fast),
        box-shadow var(--transition-fast);
}

.footer-social__link svg {
    width: 1.15rem;
    height: 1.15rem;
    display: block;
}

.footer-social__link:hover {
    color: var(--social-brand, var(--color-heading));
    background: color-mix(in srgb, var(--social-brand, var(--color-heading)) 14%, transparent);
    transform: scale(1.14);
    box-shadow: 0 0 0 1px color-mix(in srgb, var(--social-brand, var(--color-heading)) 28%, transparent);
}

@media (max-width: 768px) {
    .footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: 2rem;
    }

    .footer-brand {
        grid-column: 1 / -1;
    }

    .footer-bottom {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .footer-grid {
        grid-template-columns: 1fr;
    }
}

/* ── Error Page ── */
.error-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 2rem;
}

.error-code {
    display: block;
    font-size: clamp(4rem, 12vw, 8rem);
    font-weight: 700;
    color: var(--color-bg-card);
    letter-spacing: -0.04em;
    line-height: 1;
    margin-bottom: 1rem;
}

.error-title {
    font-size: 1.75rem;
    margin-bottom: 0.75rem;
}

.error-description {
    color: var(--color-text-muted);
    margin-bottom: 2rem;
}

/* ── Reveal Animation Base ── */
.reveal {
    opacity: 0;
    transform: translateY(16px);
    transition: opacity 0.4s ease, transform 0.4s ease;
}

.reveal.is-visible {
    opacity: 1;
    transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
    .reveal {
        opacity: 1;
        transform: none;
        transition: none;
    }
}