/* ============================================
   BASE STYLES - Reset & Typography
   ============================================ */

/* ===================
   CSS RESET
   =================== */

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-sans);
    font-size: var(--text-base);
    font-weight: var(--font-normal);
    line-height: var(--leading-normal);
    color: var(--color-text-primary);
    background-color: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
}

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

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

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

a {
    color: inherit;
    text-decoration: none;
}

ul,
ol {
    list-style: none;
}

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

h1,
h2,
h3,
h4,
h5,
h6 {
    font-weight: var(--font-semibold);
    line-height: var(--leading-tight);
    color: var(--color-text-primary);
    letter-spacing: var(--tracking-tight);
}

h1 {
    font-size: var(--text-5xl);
    font-weight: var(--font-bold);
}

h2 {
    font-size: var(--text-4xl);
}

h3 {
    font-size: var(--text-2xl);
}

h4 {
    font-size: var(--text-xl);
}

h5 {
    font-size: var(--text-lg);
}

h6 {
    font-size: var(--text-base);
    font-weight: var(--font-medium);
}

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

.lead {
    font-size: var(--text-lg);
    line-height: var(--leading-relaxed);
    color: var(--color-text-secondary);
}

.caption {
    font-size: var(--text-sm);
    color: var(--color-text-muted);
}

.overline {
    font-size: var(--text-xs);
    font-weight: var(--font-semibold);
    letter-spacing: var(--tracking-wider);
    text-transform: uppercase;
    color: var(--color-primary-600);
}

/* Links */
.link {
    color: var(--color-primary-600);
    text-decoration: underline;
    text-underline-offset: 3px;
    transition: color var(--duration-fast) var(--ease-default);
}

.link:hover {
    color: var(--color-primary-700);
}

/* ===================
   CONTAINER & LAYOUT
   =================== */

.container {
    width: 100%;
    max-width: var(--container-max);
    margin-left: auto;
    margin-right: auto;
    padding-left: var(--container-padding);
    padding-right: var(--container-padding);
}

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

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

/* Section spacing */
.section {
    padding-top: var(--space-20);
    padding-bottom: var(--space-20);
}

.section--sm {
    padding-top: var(--space-12);
    padding-bottom: var(--space-12);
}

.section--lg {
    padding-top: var(--space-32);
    padding-bottom: var(--space-32);
}

/* ===================
   UTILITY CLASSES
   =================== */

/* Text alignment */
.text-center {
    text-align: center;
}

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

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

/* Flex utilities */
.flex {
    display: flex;
}

.flex-col {
    flex-direction: column;
}

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

.items-start {
    align-items: flex-start;
}

.justify-center {
    justify-content: center;
}

.justify-between {
    justify-content: space-between;
}

.gap-2 {
    gap: var(--space-2);
}

.gap-4 {
    gap: var(--space-4);
}

.gap-6 {
    gap: var(--space-6);
}

.gap-8 {
    gap: var(--space-8);
}

/* Grid utilities */
.grid {
    display: grid;
}

.grid-cols-2 {
    grid-template-columns: repeat(2, 1fr);
}

.grid-cols-3 {
    grid-template-columns: repeat(3, 1fr);
}

.grid-cols-4 {
    grid-template-columns: repeat(4, 1fr);
}

/* Spacing */
.mt-4 {
    margin-top: var(--space-4);
}

.mt-6 {
    margin-top: var(--space-6);
}

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

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

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

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

/* Visibility */
.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;
}

/* ===================
   RESPONSIVE BREAKPOINTS
   =================== */

@media (max-width: 1024px) {
    :root {
        --container-padding: var(--space-5);
    }

    h1 {
        font-size: var(--text-4xl);
    }

    h2 {
        font-size: var(--text-3xl);
    }

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

@media (max-width: 768px) {
    :root {
        --container-padding: var(--space-4);
    }

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

    h2 {
        font-size: var(--text-2xl);
    }

    h3 {
        font-size: var(--text-xl);
    }

    .section {
        padding-top: var(--space-12);
        padding-bottom: var(--space-12);
    }

    .grid-cols-2,
    .grid-cols-3,
    .grid-cols-4 {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    h1 {
        font-size: var(--text-2xl);
    }

    .hide-mobile {
        display: none !important;
    }
}

/* ===================
   FOCUS STYLES
   =================== */

:focus-visible {
    outline: 2px solid var(--color-primary-600);
    outline-offset: 2px;
    border-radius: var(--radius-sm);
}

:focus:not(:focus-visible) {
    outline: none;
}

/* ===================
   REDUCED MOTION
   =================== */

@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;
    }
}