/* styles/global.css */

/* =====================
   BASE
===================== */

*, *::before, *::after {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    background-color: var(--color-bg);
    color: var(--color-text);
    font-family: var(--font-body);
    font-size: var(--text-base);
    line-height: var(--leading-normal);
    -webkit-font-smoothing: antialiased;
}

/* =====================
   TYPOGRAPHY
===================== */

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: var(--font-bold);
    color: var(--color-text);
}

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

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

strong { font-weight: var(--font-bold); }
small  { font-size: var(--text-sm); }

/* =====================
   MEDIA
===================== */

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

/* =====================
   LAYOUT UTILITIES
===================== */

.container {
    max-width: var(--max-width);
    margin-inline: auto;
    padding-inline: var(--container-padding);
}

.section {
    padding-block: var(--space-16);
}

.page-top {
    padding-top: 80px;
}

/* =====================
   ACCESSIBILITY
===================== */

:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 3px;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    overflow: hidden;
    clip: rect(0,0,0,0);
    white-space: nowrap;
    border: 0;
}

/* =====================
   BACK TO TOP
===================== */

.back-to-top {
    position: fixed;
    bottom: var(--space-8);
    right: var(--space-8);
    z-index: var(--z-above);

    background-color: var(--color-btn-muted);
    color: var(--color-text-light);
    border: none;
    border-radius: var(--radius-full);
    width: 44px;
    height: 44px;
    cursor: pointer;

    display: flex;
    align-items: center;
    justify-content: center;

    opacity: 0;
    pointer-events: none;
    transform: translateY(10px);
    transition: opacity var(--transition-normal),
                transform var(--transition-normal);
}

.back-to-top.visible {
    opacity: 1;
    pointer-events: all;
    transform: translateY(0);
}

.back-to-top:hover {
    opacity: 0.8;
}

/* =====================
   FOOTER
===================== */

.footer {
    background-color: var(--color-bg-dark);
    color: var(--color-text-light);
    font-family: var(--font-body);
    padding: var(--space-8);
    border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.footer-inner {
    max-width: 1100px;
    margin-inline: auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-bottom: var(--space-8);
}

.footer-logo {
    width: 140px;
    object-fit: contain;
    border-radius: var(--radius-md);
}

.footer-social {
    display: flex;
    gap: var(--space-6);
}

.footer-social a {
    color: var(--color-text-light);
    font-size: var(--text-xl);
    transition: opacity var(--transition-fast);
}

.footer-social a:hover {
    opacity: 0.6;
}

.footer-copy {
    max-width: 1100px;
    margin-inline: auto;
    font-size: var(--text-sm);
    color: var(--color-text-muted);
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    padding-top: var(--space-4);
    text-align: center;
}