/* base.css — reset, non-color custom properties, and base typography.
 *
 * Colors live exclusively in colors.css. Do not add hex values here.
 */

/* ── Non-color custom properties ──────────────────────────────────────────── */
:root {
    /* Typography — system font stack: no external requests, no build step,
       and it renders as San Francisco / Segoe UI / Roboto depending on OS,
       which already reads as "premium" without licensing a webfont. */
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
    --font-mono: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;

    /* Spacing scale */
    --space-1:  0.25rem;
    --space-2:  0.5rem;
    --space-3:  0.75rem;
    --space-4:  1rem;
    --space-5:  1.25rem;
    --space-6:  1.5rem;
    --space-8:  2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    --space-16: 4rem;
    --space-20: 5rem;
    --space-24: 6rem;

    /* Layout */
    --container-max: 1160px;
    --radius:        0.375rem;
    --radius-lg:     0.75rem;
    --radius-pill:   999px;

    /* Nav pill height — used to offset hero min-height */
    --nav-height: 76px;

    /* Elevation — soft, diffuse shadows only; never hard/dark */
    --shadow-sm: 0 1px 2px rgba(27, 36, 38, 0.06), 0 1px 3px rgba(27, 36, 38, 0.08);
    --shadow-md: 0 8px 24px rgba(27, 36, 38, 0.08), 0 2px 8px rgba(27, 36, 38, 0.06);
    --shadow-lg: 0 24px 64px rgba(27, 36, 38, 0.14), 0 4px 16px rgba(27, 36, 38, 0.08);
    --shadow-accent: 0 12px 32px rgba(18, 165, 148, 0.18);

    /* Motion — one easing family (soft ease-out / its mirrored ease-in),
       applied at a handful of durations so every interaction on the site
       glides at the same rate instead of a mix of ad-hoc speeds. */
    --ease-smooth:    cubic-bezier(0.16, 1, 0.3, 1);   /* ease-out — hovers, entrances */
    --ease-smooth-in: cubic-bezier(0.7, 0, 0.84, 0);   /* ease-in — exits */

    --transition-fast:   0.32s var(--ease-smooth);   /* color/background micro-interactions */
    --transition-base:   0.45s var(--ease-smooth);   /* buttons, borders, standard hovers */
    --transition-lift:   0.6s  var(--ease-smooth);   /* card hover lift + shadow */
    --transition-zoom:   0.85s var(--ease-smooth);   /* image scale on hover */
    --transition-reveal: 1.1s  var(--ease-smooth);   /* scroll-reveal entrance */
}

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

html {
    font-size: 100%;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    font-size: 1.0625rem;
    line-height: 1.6;
    color: var(--color-text-main);
    background-color: var(--color-light);
    -webkit-font-smoothing: antialiased;
}

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

a {
    color: var(--color-primary);
    text-decoration: underline;
}

a:hover {
    color: var(--color-primary-hover);
}

ul, ol {
    list-style: none;
}

button {
    font-family: inherit;
    cursor: pointer;
}

input, textarea, select {
    font-family: inherit;
    font-size: inherit;
}

/* ── Typography ───────────────────────────────────────────────────────────── */
h1, h2, h3, h4, h5, h6 {
    line-height: 1.2;
    font-weight: 700;
    letter-spacing: -0.01em;
    color: var(--color-text-main);
}

h1 { font-size: clamp(2rem, 5vw, 3.25rem); }
h2 { font-size: clamp(1.625rem, 3.4vw, 2.375rem); }
h3 { font-size: clamp(1.25rem, 2.4vw, 1.5rem); }
h4 { font-size: 1.125rem; }

p { margin-bottom: var(--space-4); }
p:last-child { margin-bottom: 0; }

/* ── Utilities ────────────────────────────────────────────────────────────── */
.text-center { text-align: center; }
.text-muted  { color: var(--color-text-muted); }
.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}
.eyebrow {
    display: block;
    font-size: 0.875rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--color-text-muted);
    margin-bottom: var(--space-3);
}

/* ── Buttons ──────────────────────────────────────────────────────────────── */
.btn {
    display: inline-block;
    padding: var(--space-3) var(--space-6);
    border-radius: var(--radius);
    font-weight: 600;
    font-size: 1rem;
    text-decoration: none;
    border: 2px solid transparent;
    transition: background-color var(--transition-fast), color var(--transition-fast),
        border-color var(--transition-fast), transform var(--transition-base), box-shadow var(--transition-base);
    cursor: pointer;
    line-height: 1.4;
}

.btn:active {
    transform: translateY(1px) scale(0.98);
}

.btn-primary {
    background-color: var(--color-cta-primary-bg);
    color: var(--color-cta-primary-text);
    border-color: var(--color-cta-primary-bg);
}
.btn-primary:hover {
    background-color: var(--color-cta-primary-hover-bg);
    border-color: var(--color-cta-primary-hover-bg);
    color: var(--color-cta-primary-text);
    transform: translateY(-2px);
    box-shadow: var(--shadow-accent);
}

.btn-secondary {
    background-color: var(--color-cta-secondary-bg);
    color: var(--color-cta-secondary-text);
    border-color: var(--color-cta-secondary-border);
}
.btn-secondary:hover {
    background-color: var(--color-cta-secondary-hover-bg);
    color: var(--color-cta-secondary-hover-text);
    transform: translateY(-2px);
}

.btn-light {
    background-color: var(--color-cta-light-bg);
    color: var(--color-cta-light-text);
    border-color: var(--color-cta-light-bg);
}
.btn-light:hover {
    background-color: var(--color-cta-light-hover-bg);
    border-color: var(--color-cta-light-hover-bg);
    color: var(--color-cta-light-text);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-danger {
    background-color: var(--color-error);
    color: var(--color-white);
    border-color: var(--color-error);
}
.btn-danger:hover {
    background-color: var(--color-danger-hover);
    border-color: var(--color-danger-hover);
    color: var(--color-white);
}

.btn-sm {
    padding: var(--space-1) var(--space-3);
    font-size: 0.9375rem;
}

.btn-full {
    width: 100%;
    text-align: center;
}

/* ── Alerts ───────────────────────────────────────────────────────────────── */
.alert {
    padding: var(--space-4);
    border-radius: var(--radius);
    margin-bottom: var(--space-6);
    font-size: 1rem;
}

.alert-success {
    background-color: var(--color-success-bg);
    color: var(--color-success);
    border: 1px solid var(--color-success-border);
}

.alert-error {
    background-color: var(--color-error-bg);
    color: var(--color-error);
    border: 1px solid var(--color-error-border);
}

.error-list {
    list-style: disc;
    padding-left: var(--space-6);
    margin-top: var(--space-2);
}

/* ── Forms ────────────────────────────────────────────────────────────────── */
.form-group {
    margin-bottom: var(--space-6);
}

.form-label {
    display: block;
    font-weight: 600;
    margin-bottom: var(--space-2);
    font-size: 1rem;
}

.required {
    color: var(--color-error);
}

.form-input {
    width: 100%;
    padding: var(--space-3) var(--space-4);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    background-color: var(--color-white);
    color: var(--color-text-main);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--color-focus-ring);
}

.form-select {
    width: 100%;
    padding: var(--space-3) var(--space-4);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    background-color: var(--color-white);
    color: var(--color-text-main);
    cursor: pointer;
}

.form-select:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--color-focus-ring);
}

.form-hint {
    font-size: 0.9375rem;
    color: var(--color-text-muted);
    margin-top: var(--space-2);
    margin-bottom: 0;
}

.form-actions {
    display: flex;
    gap: var(--space-3);
    flex-wrap: wrap;
    padding-top: var(--space-4);
}

/* ── Scroll-reveal (IntersectionObserver-driven, see main.js) ────────────────
 * Grid/list containers can stagger their children's entrance by setting
 * --reveal-delay via :nth-child on the .reveal descendant (see benefits.css,
 * about.css, products.css, blog.css, how-it-works.css, trust-banner.css). */
.reveal {
    opacity: 0;
    transform: translateY(32px) scale(0.99);
    transition: opacity var(--transition-reveal), transform var(--transition-reveal);
    transition-delay: var(--reveal-delay, 0s);
}
.reveal.is-visible {
    opacity: 1;
    transform: translateY(0) scale(1);
}

/* ── Page transitions ─────────────────────────────────────────────────────── *
 * A slim top progress bar (see main.js) plus a quiet fade-in on the incoming
 * page — the "YouTube/GitHub" pattern. This site is server-rendered (a real
 * navigation per view, not a SPA), so anything that tries to animate the
 * *outgoing* page runs into an unavoidable gap between "old page finishes
 * fading" and "new page's HTML arrives", which reads as a stall or glitch
 * rather than a transition. The progress bar sidesteps that entirely: it's an
 * honest, unambiguous "this is loading" cue instead of an animation trying to
 * paper over a real navigation. */
.page-progress {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: linear-gradient(90deg, var(--color-accent), var(--color-accent-hover));
    transform: scaleX(0);
    transform-origin: left;
    opacity: 0;
    z-index: 1000;
    pointer-events: none;
    transition: transform 0.6s var(--ease-smooth), opacity 0.25s var(--ease-smooth);
}

.page-progress.is-active {
    opacity: 1;
    transform: scaleX(0.75);
}

.page-progress.is-done {
    transform: scaleX(1);
    transition: transform 0.25s var(--ease-smooth), opacity 0.4s var(--ease-smooth) 0.1s;
    opacity: 0;
}

@keyframes page-content-in {
    from { opacity: 0; }
    to   { opacity: 1; }
}

.site-main {
    animation: page-content-in 0.4s var(--ease-smooth) both;
}

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.001ms !important;
        animation-iteration-count: 1 !important;
    }
    .page-progress {
        display: none;
    }
    .site-main {
        animation: none;
    }
    .reveal {
        opacity: 1;
        transform: none;
        transition: none;
    }
    .btn:hover,
    .product-card:hover,
    .post-card:hover,
    .benefit-card:hover,
    .value-card:hover {
        transform: none;
    }
}