/* ========================================
   Base Styles - Reset & Foundation
   ======================================== */

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

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
    text-size-adjust: 100%;
    scroll-padding-top: 80px;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-regular);
    line-height: var(--line-height-normal);
    color: var(--color-text);
    background-color: var(--color-white);
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
}

/* ===== Typography Base ===== */
h1, h2, h3, h4, h5, h6 {
    font-weight: var(--font-weight-bold);
    line-height: var(--line-height-tight);
    color: var(--color-text);
}

h1 { font-size: var(--font-size-4xl); }
h2 { font-size: var(--font-size-3xl); }
h3 { font-size: var(--font-size-2xl); }
h4 { font-size: var(--font-size-xl); }
h5 { font-size: var(--font-size-lg); }
h6 { font-size: var(--font-size-md); }

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

p:last-child {
    margin-bottom: 0;
}

strong, b {
    font-weight: var(--font-weight-bold);
    color: var(--color-primary);
}

em, i {
    font-style: italic;
}

small {
    font-size: var(--font-size-sm);
}

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

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

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

/* ===== Media ===== */
img, video, svg {
    max-width: 100%;
    height: auto;
    display: block;
}

img {
    image-rendering: -webkit-optimize-contrast;
}

/* ===== Form Elements ===== */
button, input, select, textarea {
    font-family: inherit;
    font-size: inherit;
    line-height: inherit;
    color: inherit;
}

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

input, select, textarea {
    outline: none;
}

input::placeholder,
textarea::placeholder {
    color: var(--color-text-muted);
    opacity: 1;
}

/* Remove default focus outline, we'll add custom ones */
:focus {
    outline: none;
}

/* Custom focus styles */
:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* ===== Selection ===== */
::selection {
    background-color: var(--color-primary);
    color: var(--color-white);
}

::-moz-selection {
    background-color: var(--color-primary);
    color: var(--color-white);
}

/* ===== Scrollbar ===== */
::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}

::-webkit-scrollbar-track {
    background: var(--color-gray-100);
}

::-webkit-scrollbar-thumb {
    background: var(--color-gray-400);
    border-radius: var(--radius-full);
    border: 2px solid var(--color-gray-100);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--color-gray-500);
}

/* Firefox */
* {
    scrollbar-width: thin;
    scrollbar-color: var(--color-gray-400) var(--color-gray-100);
}

/* ===== Container ===== */
.container {
    width: 100%;
    max-width: var(--container-max);
    margin-left: auto;
    margin-right: auto;
    padding-left: var(--section-padding-x);
    padding-right: var(--section-padding-x);
}

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

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

/* ===== Section Base ===== */
section {
    padding-top: var(--section-padding-y);
    padding-bottom: var(--section-padding-y);
    position: relative;
}

/* ===== Screen Reader 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: 0;
}

/* ===== Skip to Content ===== */
.skip-link {
    position: absolute;
    top: -100%;
    left: 50%;
    transform: translateX(-50%);
    padding: var(--space-3) var(--space-6);
    background: var(--color-primary);
    color: var(--color-white);
    border-radius: var(--radius-sm);
    z-index: var(--z-max);
    transition: top var(--transition-fast);
}

.skip-link:focus {
    top: var(--space-4);
}

/* ===== 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;
    }
}