/* ============================================================
   base.css — Reset, typography, layout primitives
   ============================================================ */

/* ---------- Reset ---------- */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    -webkit-text-size-adjust: 100%;
    scroll-behavior: smooth;
    scroll-padding-top: calc(var(--header-height) + 1rem);
}

body {
    font-family: var(--font-sans);
    font-size: var(--text-base);
    font-weight: var(--font-weight-regular);
    line-height: var(--leading-normal);
    color: var(--color-text);
    background-color: var(--color-white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
    overflow-x: clip;
}

img,
svg,
video {
    display: block;
    max-width: 100%;
    height: auto;
}

img {
    -webkit-user-drag: none;
}

a {
    color: inherit;
    text-decoration: none;
    transition: color var(--transition-fast);
}

ul,
ol {
    list-style: none;
}

button,
input,
select,
textarea {
    font: inherit;
    color: inherit;
}

button {
    background: none;
    border: 0;
    cursor: pointer;
}

/* ---------- Typography ---------- */
h1, h2, h3, h4, h5, h6 {
    font-weight: var(--font-weight-bold);
    line-height: var(--leading-tight);
    color: var(--color-text);
    letter-spacing: -0.01em;
}

h1 { font-size: var(--text-4xl); }
h2 { font-size: var(--text-3xl); }
h3 { font-size: var(--text-2xl); }
h4 { font-size: var(--text-xl); }
h5 { font-size: var(--text-lg); }
h6 { font-size: var(--text-md); }

p {
    margin-bottom: 1rem;
}

strong { font-weight: var(--font-weight-semibold); }

/* ---------- Layout primitives ---------- */
.shell {
    width: 100%;
    max-width: var(--shell-max);
    margin-inline: auto;
    padding-inline: var(--shell-pad-desktop);
}

.section {
    padding-block: var(--section-pad-y);
}

/* Section tonal variants */
.l-section-transparent {
    position: relative;
    isolation: isolate;
    background-color: transparent;
}

.l-section-transparent::before {
    content: "";
    position: absolute;
    inset: 0;
    z-index: -1;
    pointer-events: none;
    background-image:
        linear-gradient(var(--color-line) 1px, transparent 1px),
        linear-gradient(90deg, var(--color-line) 1px, transparent 1px);
    background-size: 4.5rem 4.5rem;
    opacity: 0.22;
}

.l-section-transparent > .shell {
    position: relative;
    z-index: 1;
}

.l-section-accent {
    background: linear-gradient(180deg, var(--color-primary-50) 0%, var(--color-primary-50) 100%);
}

.l-section-img {
    position: relative;
    color: var(--color-white);
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    background-attachment: fixed;
}

.l-section-img::before {
    content: "";
    position: absolute;
    inset: 0;
    pointer-events: none;
    background: linear-gradient(180deg, rgba(0, 20, 40, 0.36) 0%, rgba(0, 20, 40, 0.3) 100%);
}

.l-section-img > .shell {
    position: relative;
    z-index: 1;
}

.l-section-img .c-section-head__eyebrow {
    color: var(--color-white);
}

@media (max-width: 767px) {
    .l-section-img {
        background-attachment: scroll;
    }
}

/* ---------- Section heading block ---------- */
.c-section-head {
    /* max-width: 52rem; */
    margin-bottom: var(--section-gap);
}

.c-section-head--center {
    margin-inline: auto;
    text-align: center;
}

.c-section-head__eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-size: var(--text-xs);
    font-weight: var(--font-weight-semibold);
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--color-accent-dark);
    margin-bottom: 0.75rem;
}

.c-section-head__eyebrow::before {
    content: "";
    width: 1.75rem;
    height: 2px;
    background: var(--color-accent);
}

.c-section-head--center .c-section-head__eyebrow::after {
    content: "";
    width: 1.75rem;
    height: 2px;
    background: var(--color-accent);
}

.c-section-head__title {
    margin-bottom: 1rem;
}

.c-section-head__lead {
    font-size: var(--text-md);
    color: var(--color-text-secondary);
    line-height: var(--leading-relaxed);
    margin-bottom: 0;
}

/* ---------- Buttons ---------- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.875rem 1.75rem;
    font-size: var(--text-base);
    font-weight: var(--font-weight-semibold);
    line-height: 1;
    border-radius: var(--radius-full);
    border: 1px solid transparent;
    cursor: pointer;
    transition: background-color var(--transition), color var(--transition),
        border-color var(--transition), box-shadow var(--transition),
        transform var(--transition-fast);
    white-space: nowrap;
}

.btn:active {
    transform: translateY(1px);
}

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

.btn--primary:hover {
    background-color: var(--color-primary-dark);
    color: var(--color-white);
    box-shadow: var(--shadow);
}

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

.btn--accent:hover {
    background-color: var(--color-primary-50);
    color: var(--color-primary-dark);
    box-shadow: var(--shadow);
}

.btn--ghost {
    background-color: transparent;
    color: var(--color-primary);
    border-color: var(--color-primary);
}

.btn--ghost:hover {
    background-color: var(--color-primary);
    color: var(--color-white);
}

.btn--ghost-light {
    background-color: transparent;
    color: var(--color-white);
    border-color: rgba(255, 255, 255, 0.5);
}

.btn--ghost-light:hover {
    background-color: var(--color-white);
    color: var(--color-primary);
    border-color: var(--color-white);
}

.btn--link {
    padding: 0.25rem 0;
    border-radius: 0;
    border-bottom: 2px solid transparent;
    color: var(--color-primary);
    font-weight: var(--font-weight-semibold);
}

.btn--link:hover {
    border-bottom-color: var(--color-primary);
    color: var(--color-primary-dark);
}

.btn__icon {
    width: 1.1em;
    height: 1.1em;
    flex: 0 0 auto;
}

.btn--arrow .btn__icon {
    transition: transform var(--transition-fast);
}

.btn--arrow:hover .btn__icon {
    transform: translateX(4px);
}

/* ---------- Utilities ---------- */
.visually-hidden {
    position: absolute !important;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0 0 0 0);
    white-space: nowrap;
    border: 0;
}

.skip-link {
    position: absolute;
    top: -100%;
    left: 1rem;
    z-index: var(--z-modal);
    background: var(--color-primary);
    color: var(--color-white);
    padding: 0.75rem 1.25rem;
    border-radius: var(--radius);
    font-weight: var(--font-weight-semibold);
    transition: top var(--transition);
}

.skip-link:focus {
    top: 1rem;
}

/* Scroll reveal base (FOUC-safe: only hidden when JS adds the class) */
[data-reveal] {
    opacity: 1;
    transform: none;
    transition: opacity 0.7s var(--ease-out), transform 0.7s var(--ease-out);
}

.js [data-reveal] {
    opacity: 0;
    transform: translateY(28px);
}

.js [data-reveal].is-revealed {
    opacity: 1;
    transform: none;
}

/* Responsive typography */
@media (max-width: 1023px) {
    h1 { font-size: var(--text-3xl); }
    h2 { font-size: var(--text-2xl); }
    h3 { font-size: var(--text-xl); }
}

@media (max-width: 767px) {
    h1 { font-size: var(--text-2xl); }
    h2 { font-size: var(--text-xl); }
    .shell {
        padding-inline: var(--shell-pad-mobile);
    }
}