/* ==========================================================================
   BespokeLMS Marketing Site — Base Styles
   Reset, element defaults, and utility classes
   ========================================================================== */

/* ── Reset ──────────────────────────────────────────────────────────────── */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    /* Smooth theme switching — colour properties only, won't affect layout or scroll animations */
    transition: background-color var(--transition-base), border-color var(--transition-base), color var(--transition-fast);
}

/* Opt-out for elements where transition would be disruptive */
.fade-up,
.logo-marquee__track,
.site-nav__dropdown,
.site-nav__dropdown-chevron,
.btn {
    transition: unset;
}

/* ── Brand text selection colour ────────────────────────────────────────── */
::selection {
    background-color: var(--accent-primary);
    color: var(--text-inverse);
}

::-moz-selection {
    background-color: var(--accent-primary);
    color: var(--text-inverse);
}

html {
    font-size: var(--font-size-md);
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-family-body);
    font-size: var(--font-size-md);
    font-weight: var(--font-weight-regular);
    line-height: var(--line-height-relaxed);
    color: var(--text-secondary);
    background-color: var(--surface-primary);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ── Typography Defaults ────────────────────────────────────────────────── */
h1,
h2,
h3,
h4,
h5,
h6 {
    font-family: var(--font-family-body-heading);
    font-weight: var(--font-weight-bold);
    line-height: var(--line-height-tight);
    color: var(--text-primary);
    letter-spacing: var(--letter-spacing-tight);
    text-wrap: balance;
}

.section-subtitle,
.section-description,
[data-balanced] {
    text-wrap: balance;
}

.text-balance {
    text-wrap: balance;
}

h1 {
    font-size: var(--font-size-3xl);
}

h2 {
    font-size: var(--font-size-2xl);
    line-height: var(--line-height-snug);
}

h3 {
    font-size: clamp(1.15rem, 2vw, var(--font-size-xl));
    font-weight: var(--font-weight-semibold);
}

h4 {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
}

p {
    line-height: var(--line-height-relaxed);
    color: var(--text-secondary);
}

p+p {
    margin-top: var(--space-4);
}

a {
    color: var(--text-primary);
    text-decoration: none;
    transition: opacity var(--transition-base);
}

a:hover {
    opacity: var(--opacity-70);
}

/* In-body links (inside paragraphs) get teal treatment */
p a,
li a {
    color: var(--text-link);
}

p a:hover,
li a:hover {
    opacity: var(--opacity-80);
    text-decoration: underline;
    text-underline-offset: 2px;
}

/* ── Focus Styles ───────────────────────────────────────────────────────── */
:focus-visible {
    outline: var(--outline-width) solid var(--border-focus);
    outline-offset: 2px;
    border-radius: var(--radius-sm);
}

/* ── Skip Link ──────────────────────────────────────────────────────────── */
.skip-link {
    position: absolute;
    top: -100%;
    left: var(--space-4);
    padding: var(--space-2) var(--space-4);
    background: var(--surface-inverse);
    color: var(--text-inverse);
    border-radius: var(--radius-base);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    z-index: var(--z-index-toast);
    text-decoration: none;
}
.skip-link:focus {
    top: var(--space-4);
}

/* ── Images & Media ───────────────────────────────────────────────────────── */
img,
video {
    display: block;
    max-width: 100%;
    height: auto;
}

/* Dark mode — UI Mockups Native Styling */
/* Replaces hacky filter: invert(1) with precise DOM styling */

/* Lines and placeholders */

/* All images get 100% opacity by default and a smooth transition */
img.theme-image,
.theme-image {
    opacity: 1;
    transition: opacity var(--transition-base);
}

/* Dark mode drops opacity to 60% */

/* ── Lists ──────────────────────────────────────────────────────────────── */
ul,
ol {
    list-style: none;
}

/* ── Layout Utilities ───────────────────────────────────────────────────── */
.container {
    width: 100%;
    max-width: var(--max-width-site);
    margin-inline: auto;
    padding-inline: var(--gutter);
}

.container--narrow {
    max-width: var(--max-width-prose);
}

/* ── Scroll Animations ──────────────────────────────────────────────────── */
.fade-up {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity var(--duration-700) var(--ease-smooth), transform 0.7s cubic-bezier(0.2, 0.8, 0.2, 1);
}

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

/* ── Screen Reader Only (sr-only) ───────────────────────────────────────── */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

.fade-up-delay-1 {
    transition-delay: 0.1s;
}

.fade-up-delay-2 {
    transition-delay: 0.2s;
}

.fade-up-delay-3 {
    transition-delay: 0.3s;
}

.fade-up-delay-4 {
    transition-delay: var(--duration-400);
}

.fade-up-delay-5 {
    transition-delay: var(--duration-500);
}

/* ── Visually Hidden (accessibility) ───────────────────────────────────── */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* overflow-x: clip prevents horizontal scroll without creating a new scroll
   container (unlike overflow-x: hidden, which breaks position:sticky). */
body {
    overflow-x: clip;
}

/* ── Salix-style vertical guide lines ───────────────────────────────────── */
/*
   Real DOM elements (not pseudo-elements) so overflow-x:clip on body
   cannot create a containing block that breaks position:fixed.
   Lines are positioned at the edge of the max-width content container.
*/
#main {
    position: relative;
}

#main:focus,
#main:focus-visible {
    outline: none !important;
}

.guide-lines {
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: var(--z-index-base);
    /* Above page content, below nav */
}

@keyframes guide-colour-cycle {
    0% {
        background-color: var(--color-teal-10);
    }

    /* teal */
    33% {
        background-color: var(--color-navy-10);
    }

    /* navy */
    66% {
        background-color: var(--color-teal-10);
    }

    /* teal tint */
    100% {
        background-color: var(--color-teal-10);
    }

    /* teal */
}

.guide-line {
    position: absolute;
    top: 0;
    height: 100%;
    width: 1px;
    animation: guide-colour-cycle 6s var(--ease-in-out) infinite;
}

.guide-line--left {
    left: max(0px, calc((100vw - var(--max-width-site)) / 2));
    animation-delay: 0s;
}

.guide-line--right {
    right: max(0px, calc((100vw - var(--max-width-site)) / 2));
    animation-delay: 3s;
    /* Offset so the two lines are out of phase */
}



@media (max-width: 768px) {
    .guide-lines {
        display: none;
    }
}

section {
    position: relative;
}

/* ── Utility overrides ── */
.bg-subtle,
.section--surface-2,
.bg-surface-2 {
    background-color: var(--surface-secondary) !important;
    background-image: linear-gradient(var(--border-subtle) 1px, transparent 1px),
                      linear-gradient(90deg, var(--border-subtle) 1px, transparent 1px);
    background-size: 32px 32px;
}

/* ── Accessibility (WCAG D-9) ───────────────────────────────────────────── */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}