/* ============================================
   Layout
   ============================================ */

.container {
    width: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--container-pad);
}

/* === Section === */
.section {
    padding: var(--s-10) 0;
    position: relative;
}

.section--alt {
    background: var(--c-paper-warm);
}

.section--dark {
    background: var(--c-ink);
    color: var(--c-text-invert);
}

.section__head {
    max-width: 780px;
    margin: 0 auto var(--s-9);
    text-align: center;
}

.section__head--light {
    color: var(--c-text-invert);
}

.section__title {
    font-family: var(--f-display);
    font-weight: 800;
    font-size: clamp(2rem, 4.5vw, 3.25rem);
    line-height: 1.15;
    letter-spacing: -0.035em;
    margin-bottom: var(--s-5);
    color: var(--c-ink);
}

.section--dark .section__title {
    color: var(--c-paper);
}

.section__title em {
    font-style: normal;
    background: var(--grad-brand);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    color: transparent;
}

.section--dark .section__title em {
    background: linear-gradient(90deg, #5DC7F2 0%, #B98DDE 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.section__lead {
    font-size: clamp(0.95rem, 1.5vw, 1.125rem);
    line-height: 1.7;
    color: var(--c-text-soft);
    max-width: 640px;
    margin: 0 auto;
}

.section--dark .section__lead {
    color: rgba(250, 250, 247, 0.7);
}

.eyebrow {
    display: inline-block;
    font-family: var(--f-mono);
    font-size: 0.75rem;
    font-weight: 500;
    letter-spacing: 0.12em;
    color: var(--c-text-mute);
    margin-bottom: var(--s-4);
    text-transform: uppercase;
}

.eyebrow--light {
    color: rgba(250, 250, 247, 0.6);
}

/* === Navigation === */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    height: var(--nav-h);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    background: rgba(250, 250, 247, 0.72);
    border-bottom: 1px solid transparent;
    transition: all 0.3s var(--ease-out);
}

.nav.is-scrolled {
    border-bottom-color: var(--c-line);
    background: rgba(250, 250, 247, 0.92);
}

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

.nav__brand {
    display: inline-flex;
    align-items: center;
    gap: var(--s-3);
    font-family: var(--f-display);
    letter-spacing: -0.01em;
}

.nav__logo {
    height: 24px;
    width: auto;
    display: block;
}

.nav__brand-mark {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--c-ink);
}

.nav__brand-year {
    font-family: var(--f-mono);
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--c-text-soft);
    letter-spacing: 0.05em;
    padding: 3px 8px;
    border: 1px solid var(--c-line);
    border-radius: var(--r-pill);
}

.nav__menu {
    display: flex;
    align-items: center;
    gap: var(--s-7);
}

.nav__menu a {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--c-text-soft);
    transition: color 0.2s var(--ease-out);
}

.nav__menu a:hover {
    color: var(--c-ink);
}

.nav__cta {
    display: inline-flex;
    align-items: center;
    gap: var(--s-2);
    padding: 10px 18px;
    background: var(--c-ink);
    color: var(--c-paper);
    border-radius: var(--r-pill);
    font-size: 0.875rem;
    font-weight: 500;
    transition: transform 0.2s var(--ease-out), background 0.2s var(--ease-out);
}

.nav__cta:hover {
    background: var(--c-brand-deep);
    transform: translateY(-1px);
}

.nav__cta svg {
    transition: transform 0.2s var(--ease-out);
}

.nav__cta:hover svg {
    transform: translate(2px, -2px);
}