/**
 * Base Styles
 * Hudson Capital Holding Ltd Website
 * 
 * This file contains reset styles, base element styles,
 * and fundamental typography rules.
 */

/* ==========================================================================
   CSS Reset / Normalize
   ========================================================================== */

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

/* Remove default margin and padding */
html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-primary);
    font-size: var(--text-base);
    font-weight: var(--font-normal);
    line-height: var(--leading-normal);
    color: var(--text-primary);
    background-color: var(--bg-primary);
    min-height: 100vh;
    overflow-x: hidden;
}

/* Typography Reset */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: var(--font-bold);
    line-height: var(--leading-tight);
    color: var(--text-primary);
}

h1 {
    font-size: var(--text-5xl);
    letter-spacing: var(--tracking-tight);
}

h2 {
    font-size: var(--text-4xl);
    letter-spacing: var(--tracking-tight);
}

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

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

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

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

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

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

/* Links */
a {
    color: var(--text-link);
    text-decoration: none;
    transition: var(--transition-colors);
}

a:hover {
    color: var(--text-link-hover);
}

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

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

/* Form Elements */
input, button, textarea, select {
    font: inherit;
    color: inherit;
}

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

/* Remove default button styles in Safari */
button,
[type="button"],
[type="reset"],
[type="submit"] {
    -webkit-appearance: button;
}

/* Remove inner border in Firefox */
button::-moz-focus-inner,
[type="button"]::-moz-focus-inner,
[type="reset"]::-moz-focus-inner,
[type="submit"]::-moz-focus-inner {
    border-style: none;
    padding: 0;
}

/* Textarea */
textarea {
    resize: vertical;
}

/* Tables */
table {
    border-collapse: collapse;
    border-spacing: 0;
}

/* Remove default fieldset styles */
fieldset {
    border: 0;
    padding: 0;
    margin: 0;
    min-width: 0;
}

/* Remove focus outline on non-keyboard focus */
:focus:not(:focus-visible) {
    outline: none;
}

/* Add visible focus for keyboard users */
:focus-visible {
    outline: 2px solid var(--color-primary-500);
    outline-offset: 2px;
}

/* Remove animations for people who prefer not to see them */
@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;
    }
}

/* ==========================================================================
   Base Typography
   ========================================================================== */

.text-xs { font-size: var(--text-xs); }
.text-sm { font-size: var(--text-sm); }
.text-base { font-size: var(--text-base); }
.text-lg { font-size: var(--text-lg); }
.text-xl { font-size: var(--text-xl); }
.text-2xl { font-size: var(--text-2xl); }
.text-3xl { font-size: var(--text-3xl); }
.text-4xl { font-size: var(--text-4xl); }
.text-5xl { font-size: var(--text-5xl); }

.font-light { font-weight: var(--font-light); }
.font-normal { font-weight: var(--font-normal); }
.font-medium { font-weight: var(--font-medium); }
.font-semibold { font-weight: var(--font-semibold); }
.font-bold { font-weight: var(--font-bold); }

.text-center { text-align: center; }
.text-left { text-align: justify; }
.text-right { text-align: right; }
.text-justify { text-align: justify; }

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

/* ==========================================================================
   Selection Styles
   ========================================================================== */

::selection {
    background-color: var(--color-primary-200);
    color: var(--color-primary-900);
}

::-moz-selection {
    background-color: var(--color-primary-200);
    color: var(--color-primary-900);
}

/* ==========================================================================
   Scrollbar Styles (Webkit)
   ========================================================================== */

::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}

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

::-webkit-scrollbar-thumb {
    background: var(--color-neutral-400);
    border-radius: var(--radius-full);
}

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

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

/* ==========================================================================
   Screen Reader Only (Accessibility)
   ========================================================================== */

.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;
}

.sr-only-focusable:active,
.sr-only-focusable:focus {
    position: static;
    width: auto;
    height: auto;
    padding: inherit;
    margin: inherit;
    overflow: visible;
    clip: auto;
    white-space: normal;
}