@import url('variables.css');

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

html {
    font-family: var(--font-family-sans);
    font-size: 16px;
    line-height: 1.6;
    color: var(--color-text-main);
    background-color: var(--color-bg-main);
    scroll-behavior: smooth;
}

body {
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

main {
    flex: 1;
}

h1,
h2,
h3,
h4,
h5,
h6 {
    color: var(--color-primary);
    line-height: 1.2;
    font-weight: 700;
    margin-bottom: var(--spacing-4);
}

h1,
h2 {
    font-family: var(--font-family-serif);
}

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

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

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

ul,
ol {
    list-style: none;
}

button {
    cursor: pointer;
    border: none;
    background: none;
    font-family: inherit;
}

/* Base Layout Classes */
.container {
    width: 100%;
    max-width: var(--max-width);
    margin-left: auto;
    margin-right: auto;
    padding-left: var(--spacing-4);
    padding-right: var(--spacing-4);
}

.section {
    padding-top: var(--spacing-16);
    padding-bottom: var(--spacing-16);
}

@media (min-width: 768px) {
    .section {
        padding-top: var(--spacing-24);
        padding-bottom: var(--spacing-24);
    }
}

.section-alt {
    background-color: var(--color-bg-alt);
}

.text-center {
    text-align: center;
}

.text-primary {
    color: var(--color-primary);
}

.text-secondary {
    color: var(--color-secondary);
}

.text-muted {
    color: var(--color-text-muted);
}

.mb-2 {
    margin-bottom: var(--spacing-2);
}

.mb-4 {
    margin-bottom: var(--spacing-4);
}

.mb-6 {
    margin-bottom: var(--spacing-6);
}

.mb-8 {
    margin-bottom: var(--spacing-8);
}

.mb-12 {
    margin-bottom: var(--spacing-12);
}

.mt-8 {
    margin-top: var(--spacing-8);
}

.mt-12 {
    margin-top: var(--spacing-12);
}

/* Typography Scale */
.text-sm   { font-size: var(--font-size-sm); }
.text-lg   { font-size: var(--font-size-lg); }
.text-xl   { font-size: var(--font-size-xl); }
.text-2xl  { font-size: var(--font-size-2xl); }
.text-3xl  { font-size: var(--font-size-3xl); }
.text-4xl  { font-size: var(--font-size-4xl); }
.text-5xl  { font-size: var(--font-size-5xl); }

/* Font Weight Utilities */
.font-medium   { font-weight: 500; }
.font-semibold { font-weight: 600; }
.font-bold     { font-weight: 700; }

/* Header Base */
.site-header {
    position: sticky;
    top: 0;
    z-index: 1000;
    background-color: oklch(99.5% 0.004 20 / 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-border);
    padding: var(--spacing-4) 0;
}

.site-header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

/* Footer Base */
.site-footer {
    background-color: var(--color-primary);
    color: white;
    padding: var(--spacing-16) 0 var(--spacing-8);
}

.site-footer h3 {
    color: white;
}

.site-footer h4 {
    color: var(--color-accent);
}

.site-footer p {
    color: rgba(255,255,255,0.8);
}

.site-footer ul {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-2);
    color: rgba(255,255,255,0.8);
}

.site-footer .footer-bottom {
    border-top: 1px solid rgba(255,255,255,0.1);
    padding-top: var(--spacing-8);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-4);
    font-size: var(--font-size-sm);
    color: rgba(255,255,255,0.6);
}

.site-footer .footer-bottom a {
    text-decoration: underline;
}

/* Narrow text containers */
.text-narrow {
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

/* Accessibility: visually hidden but available to screen readers */
.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;
}

/* Utility Animations */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 400ms cubic-bezier(0.25, 0, 0, 1),
                transform 400ms cubic-bezier(0.25, 0, 0, 1);
}

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

/* Stagger children — estado inicial */
.stagger-child {
    opacity: 0;
    transform: translateY(16px);
    transition: opacity 450ms cubic-bezier(0.25, 0, 0, 1),
                transform 450ms cubic-bezier(0.25, 0, 0, 1);
}

.stagger-child.is-visible {
    opacity: 1;
    transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        transition-duration: 0.001ms !important;
        animation-duration: 0.001ms !important;
    }

    .fade-in,
    .stagger-child {
        opacity: 1;
        transform: none;
        transition: none;
    }
}