/* ==========================================================================
   Header — Minimal transparent → solid on scroll, hamburger, mobile menu
   ========================================================================== */

.dp-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    height: var(--header-h);
    display: flex;
    align-items: center;
    transition: background-color var(--dur) var(--ease),
                border-color var(--dur) var(--ease),
                backdrop-filter var(--dur) var(--ease);
    background-color: transparent;
    border-bottom: 1px solid transparent;
}

.dp-header.is-scrolled {
    background-color: rgba(9, 9, 12, 0.95);
    border-bottom-color: var(--c-border);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

.dp-header__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    max-width: var(--max-w);
    margin: 0 auto;
    padding: 0 var(--s-16);
}

/* Logo */
.dp-header__logo {
    display: flex;
    align-items: center;
    gap: var(--s-8);
    text-decoration: none;
    flex-shrink: 0;
    z-index: 1001;
}

.dp-header__logo-img {
    height: 40px;
    width: auto;
}

.dp-header__logo-text {
    font-family: var(--f-heading);
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--c-white);
    letter-spacing: 0.5px;
}

.dp-header__logo:hover .dp-header__logo-text {
    color: var(--c-accent-hover);
}

/* Nav */
.dp-header__nav {
    display: none;
    align-items: center;
    gap: var(--s-4);
}

.dp-header__link {
    font-family: var(--f-body);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--c-text-dim);
    padding: var(--s-8) var(--s-12);
    border-radius: var(--r-sm);
    transition: color var(--dur) var(--ease);
    text-decoration: none;
    white-space: nowrap;
}

.dp-header__link:hover {
    color: var(--c-white);
}

.dp-header__link.is-active {
    color: var(--c-accent);
    font-weight: 600;
}

.dp-header__link--cta {
    background-color: var(--c-accent);
    color: var(--c-white);
    font-weight: 600;
    padding: var(--s-8) var(--s-16);
}

.dp-header__link--cta:hover {
    background-color: var(--c-accent-hover);
    color: var(--c-white);
}

/* Hamburger */
.dp-hamburger {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 40px;
    height: 40px;
    gap: 6px;
    z-index: 1001;
    cursor: pointer;
    background: none;
    border: none;
    padding: 0;
}

.dp-hamburger__line {
    display: block;
    width: 24px;
    height: 2px;
    background-color: var(--c-white);
    transition: transform var(--dur) var(--ease),
                opacity var(--dur) var(--ease);
}

.dp-hamburger.is-active .dp-hamburger__line:nth-child(1) {
    transform: translateY(8px) rotate(45deg);
}

.dp-hamburger.is-active .dp-hamburger__line:nth-child(2) {
    opacity: 0;
}

.dp-hamburger.is-active .dp-hamburger__line:nth-child(3) {
    transform: translateY(-8px) rotate(-45deg);
}

/* Mobile menu */
.dp-mobile-menu {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 999;
    background-color: rgba(9, 9, 12, 0.98);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--s-4);
    padding: var(--s-80) var(--s-24);
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--dur) var(--ease),
                visibility var(--dur) var(--ease);
}

.dp-mobile-menu.is-open {
    opacity: 1;
    visibility: visible;
}

.dp-mobile-menu__link {
    font-family: var(--f-heading);
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--c-text);
    padding: var(--s-12) var(--s-24);
    text-decoration: none;
    transition: color var(--dur) var(--ease);
}

.dp-mobile-menu__link:hover,
.dp-mobile-menu__link.is-active {
    color: var(--c-accent);
}

.dp-mobile-menu__cta {
    margin-top: var(--s-24);
}