/* ==========================================================================
   Git12 - Main Stylesheet
   Minimalist beige/sober design system
   ========================================================================== */

/* ==========================================================================
   1. CSS Custom Properties (Design Tokens)
   ========================================================================== */
:root {
    /* --- Colors: Beige / Sober Palette --- */
    --color-beige:          #D5C6A1;
    --color-beige-light:    #E8DCC8;
    --color-beige-dark:     #BBA979;
    --color-cream:          #F5F0E8;
    --color-cream-light:    #FAF8F4;
    --color-off-white:      #FDFCFA;
    --color-brown:          #6B5B3E;
    --color-brown-light:    #8C7A5A;
    --color-brown-dark:     #4A3F2B;
    --color-taupe:          #A09078;
    --color-charcoal:       #3B3A36;
    --color-charcoal-light: #5C5A54;
    --color-white:          #FFFFFF;
    --color-black:          #1A1A1A;

    /* Semantic color assignments */
    --color-primary:        var(--color-brown);
    --color-primary-hover:  var(--color-brown-dark);
    --color-primary-light:  var(--color-beige-light);
    --color-secondary:      var(--color-taupe);
    --color-secondary-hover:var(--color-brown-light);
    --color-accent:         var(--color-beige-dark);
    --color-background:     var(--color-off-white);
    --color-surface:        var(--color-white);
    --color-surface-alt:    var(--color-cream);
    --color-text:           var(--color-charcoal);
    --color-text-light:     var(--color-charcoal-light);
    --color-text-muted:     var(--color-taupe);
    --color-heading:        var(--color-brown-dark);
    --color-border:         var(--color-beige-light);
    --color-border-dark:    var(--color-beige);

    /* Status colors (muted to match sober palette) */
    --color-success:        #6B8C5A;
    --color-error:          #A0524E;
    --color-warning:        #B8963E;
    --color-info:           #5A7A8C;

    /* --- Typography --- */
    --font-primary:         'Georgia', 'Times New Roman', serif;
    --font-secondary:       -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    --font-mono:            'Courier New', Courier, monospace;

    --font-size-xs:         0.75rem;   /* 12px */
    --font-size-sm:         0.875rem;  /* 14px */
    --font-size-base:       1rem;      /* 16px */
    --font-size-md:         1.125rem;  /* 18px */
    --font-size-lg:         1.25rem;   /* 20px */
    --font-size-xl:         1.5rem;    /* 24px */
    --font-size-2xl:        2rem;      /* 32px */
    --font-size-3xl:        2.5rem;    /* 40px */
    --font-size-4xl:        3rem;      /* 48px */

    --font-weight-normal:   400;
    --font-weight-medium:   500;
    --font-weight-semibold: 600;
    --font-weight-bold:     700;

    --line-height-tight:    1.2;
    --line-height-normal:   1.6;
    --line-height-relaxed:  1.8;

    --letter-spacing-tight: -0.02em;
    --letter-spacing-normal: 0;
    --letter-spacing-wide:  0.05em;
    --letter-spacing-wider: 0.1em;

    /* --- Spacing --- */
    --space-xs:             0.25rem;   /* 4px  */
    --space-sm:             0.5rem;    /* 8px  */
    --space-md:             1rem;      /* 16px */
    --space-lg:             1.5rem;    /* 24px */
    --space-xl:             2rem;      /* 32px */
    --space-2xl:            3rem;      /* 48px */
    --space-3xl:            4rem;      /* 64px */
    --space-4xl:            6rem;      /* 96px */

    /* --- Layout --- */
    --container-max:        1200px;
    --container-narrow:     800px;
    --container-wide:       1400px;
    --header-height:        70px;

    /* --- Borders --- */
    --radius-sm:            4px;
    --radius-md:            8px;
    --radius-lg:            12px;
    --radius-full:          50%;
    --border-width:         1px;

    /* --- Shadows (soft, minimal) --- */
    --shadow-sm:            0 1px 3px rgba(59, 58, 54, 0.06);
    --shadow-md:            0 4px 12px rgba(59, 58, 54, 0.08);
    --shadow-lg:            0 8px 24px rgba(59, 58, 54, 0.1);
    --shadow-xl:            0 12px 36px rgba(59, 58, 54, 0.12);

    /* --- Transitions --- */
    --transition-fast:      150ms ease;
    --transition-base:      300ms ease;
    --transition-slow:      500ms ease;

    /* --- Z-Index Scale --- */
    --z-dropdown:           100;
    --z-header:             1000;
    --z-overlay:            5000;
    --z-notification:       9999;
}

/* ==========================================================================
   2. CSS Reset
   ========================================================================== */
*,
*::before,
*::after {
    box-sizing: border-box;
}

* {
    margin: 0;
    padding: 0;
}

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

body {
    font-family: var(--font-secondary);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-normal);
    line-height: var(--line-height-normal);
    color: var(--color-text);
    background-color: var(--color-background);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    min-height: 100vh;
}

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

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

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

ul,
ol {
    list-style: none;
}

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

table {
    border-collapse: collapse;
    border-spacing: 0;
}

/* Remove default focus outline and add custom one */
:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* ==========================================================================
   3. Base / Global Styles
   ========================================================================== */

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-primary);
    line-height: var(--line-height-tight);
    margin-bottom: 0.5em;
    font-weight: var(--font-weight-semibold);
    color: var(--color-heading);
    letter-spacing: var(--letter-spacing-tight);
}

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

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

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

h4 {
    font-size: var(--font-size-lg);
}

h5 {
    font-size: var(--font-size-md);
}

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

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

a {
    color: var(--color-primary);
    transition: color var(--transition-base);
}

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

strong,
b {
    font-weight: var(--font-weight-semibold);
}

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

/* ==========================================================================
   4. Layout
   ========================================================================== */
.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--space-md);
}

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

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

.section {
    padding: var(--space-3xl) 0;
}

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

.section__title {
    text-align: center;
    margin-bottom: var(--space-2xl);
    color: var(--color-heading);
    font-family: var(--font-primary);
    letter-spacing: var(--letter-spacing-tight);
}

.section__description {
    max-width: var(--container-narrow);
    margin: 0 auto var(--space-lg);
    text-align: center;
    font-size: var(--font-size-md);
    color: var(--color-text-light);
    line-height: var(--line-height-relaxed);
}

/* About Section */
.about-section {
    background-color: var(--color-cream);
    padding: var(--space-2xl) 0;
}

.about-section .section__subtitle {
    text-align: center;
    margin-bottom: var(--space-lg);
    font-weight: var(--font-weight-medium);
    color: var(--color-heading);
}

.about-section .section__description {
    max-width: var(--container-narrow);
    margin: 0 auto;
    text-align: center;
    font-size: var(--font-size-md);
    color: var(--color-text-light);
}

/* Grid System */
.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-xl);
    margin-top: var(--space-xl);
}

/* ==========================================================================
   5. Header & Navigation
   ========================================================================== */
.header {
    background-color: var(--color-surface);
    border-bottom: var(--border-width) solid var(--color-border);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: var(--z-header);
    transition: box-shadow var(--transition-base);
}

.header.scrolled {
    box-shadow: var(--shadow-md);
}

.nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-md);
    max-width: var(--container-max);
    margin: 0 auto;
}

.nav__brand h1 {
    color: var(--color-primary);
    margin: 0;
    font-size: var(--font-size-xl);
    font-family: var(--font-primary);
    letter-spacing: var(--letter-spacing-wide);
}

.nav__menu {
    display: flex;
    list-style: none;
    gap: var(--space-xl);
    margin: 0;
}

.nav__link {
    color: var(--color-text);
    font-family: var(--font-secondary);
    font-weight: var(--font-weight-medium);
    font-size: var(--font-size-sm);
    letter-spacing: var(--letter-spacing-wide);
    text-transform: uppercase;
    padding: var(--space-sm) 0;
    position: relative;
    transition: color var(--transition-base);
}

.nav__link:hover,
.nav__link--active {
    color: var(--color-primary);
}

.nav__link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--color-primary);
    transition: width var(--transition-base);
}

.nav__link:hover::after,
.nav__link--active::after {
    width: 100%;
}

.nav__link--active {
    font-weight: var(--font-weight-bold);
}

/* Nav Actions (cart + toggle) */
.nav__actions {
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

.nav__cart {
    position: relative;
    display: flex;
    align-items: center;
    color: var(--color-text);
    transition: color var(--transition-base);
}

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

.nav__cart-icon {
    width: 24px;
    height: 24px;
    display: inline-block;
}

.nav__cart-badge {
    position: absolute;
    top: -8px;
    right: -10px;
    background-color: var(--color-brown);
    color: var(--color-white);
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-bold);
    width: 18px;
    height: 18px;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    line-height: 1;
}

.nav__cart-badge--empty {
    background-color: var(--color-taupe);
}

.nav__brand-link {
    text-decoration: none;
    color: inherit;
}

.nav__brand-link:hover {
    color: inherit;
}

.nav__toggle {
    display: none;
    flex-direction: column;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--space-sm);
}

.nav__toggle-line {
    width: 25px;
    height: 2px;
    background-color: var(--color-text);
    margin: 3px 0;
    transition: all var(--transition-base);
    border-radius: 2px;
}

/* ==========================================================================
   6. Hero Section
   ========================================================================== */
.hero {
    background: linear-gradient(
        135deg,
        var(--color-beige-dark) 0%,
        var(--color-brown) 50%,
        var(--color-brown-dark) 100%
    );
    color: var(--color-cream-light);
    text-align: center;
    padding: var(--space-4xl) 0 var(--space-3xl);
    margin-top: var(--header-height);
}

.hero__title {
    font-size: var(--font-size-4xl);
    margin-bottom: var(--space-md);
    color: var(--color-white);
    font-family: var(--font-primary);
    letter-spacing: var(--letter-spacing-tight);
    animation: fadeInUp 1s ease-out;
}

.hero__subtitle {
    font-size: var(--font-size-lg);
    margin-bottom: var(--space-xl);
    opacity: 0.9;
    font-family: var(--font-secondary);
    font-weight: var(--font-weight-normal);
    color: var(--color-beige-light);
    animation: fadeInUp 1s ease-out 0.2s both;
}

/* ==========================================================================
   7. Cards
   ========================================================================== */
.card {
    background: var(--color-surface);
    padding: var(--space-xl);
    border-radius: var(--radius-md);
    border: var(--border-width) solid var(--color-border);
    text-align: center;
    transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.card__title {
    color: var(--color-heading);
    margin-bottom: var(--space-md);
    font-family: var(--font-primary);
}

.card__description {
    color: var(--color-text-light);
    margin-bottom: 0;
    line-height: var(--line-height-relaxed);
}

.card__price {
    color: var(--color-primary);
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--space-md);
}

/* ==========================================================================
   8. Buttons
   ========================================================================== */
.btn {
    display: inline-block;
    padding: var(--space-sm) var(--space-xl);
    border: var(--border-width) solid transparent;
    border-radius: var(--radius-sm);
    font-family: var(--font-secondary);
    font-weight: var(--font-weight-medium);
    font-size: var(--font-size-sm);
    letter-spacing: var(--letter-spacing-wide);
    text-align: center;
    text-transform: uppercase;
    cursor: pointer;
    transition: all var(--transition-base);
    text-decoration: none;
    line-height: var(--line-height-normal);
}

.btn:active {
    transform: translateY(0);
}

/* Primary button */
.btn--primary {
    background-color: var(--color-primary);
    color: var(--color-white);
    border-color: var(--color-primary);
}

.btn--primary:hover {
    background-color: var(--color-primary-hover);
    border-color: var(--color-primary-hover);
    color: var(--color-white);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* Secondary / outline button */
.btn--secondary {
    background-color: transparent;
    color: var(--color-primary);
    border-color: var(--color-primary);
}

.btn--secondary:hover {
    background-color: var(--color-primary);
    color: var(--color-white);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* Ghost / subtle button */
.btn--ghost {
    background-color: transparent;
    color: var(--color-text);
    border-color: var(--color-border-dark);
}

.btn--ghost:hover {
    background-color: var(--color-cream);
    color: var(--color-primary);
    border-color: var(--color-primary);
}

/* Light button (for dark backgrounds) */
.btn--light {
    background-color: var(--color-cream-light);
    color: var(--color-primary);
    border-color: var(--color-cream-light);
}

.btn--light:hover {
    background-color: var(--color-white);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* Button sizes */
.btn--sm {
    padding: var(--space-xs) var(--space-md);
    font-size: var(--font-size-xs);
}

.btn--lg {
    padding: var(--space-md) var(--space-2xl);
    font-size: var(--font-size-base);
}

/* ==========================================================================
   9. Forms
   ========================================================================== */
.form {
    max-width: 600px;
    margin: 0 auto;
}

.form__group {
    margin-bottom: var(--space-lg);
}

.form__label {
    display: block;
    margin-bottom: var(--space-sm);
    font-weight: var(--font-weight-medium);
    font-size: var(--font-size-sm);
    color: var(--color-text);
    letter-spacing: var(--letter-spacing-wide);
}

.form__input,
.form__textarea {
    width: 100%;
    padding: var(--space-sm) var(--space-md);
    border: var(--border-width) solid var(--color-border-dark);
    border-radius: var(--radius-sm);
    font-size: var(--font-size-base);
    background-color: var(--color-surface);
    color: var(--color-text);
    transition: border-color var(--transition-base), box-shadow var(--transition-base);
}

.form__input:focus,
.form__textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(107, 91, 62, 0.1);
}

.form__input::placeholder,
.form__textarea::placeholder {
    color: var(--color-text-muted);
}

.form__textarea {
    resize: vertical;
    min-height: 120px;
}

/* ==========================================================================
   10. Product Detail
   ========================================================================== */
.product-detail {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-2xl);
    align-items: start;
    margin-bottom: var(--space-xl);
}

.product-detail__title {
    font-size: var(--font-size-2xl);
    color: var(--color-heading);
    margin-bottom: var(--space-md);
}

.product-detail__price {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-semibold);
    color: var(--color-primary);
    margin-bottom: var(--space-lg);
}

.product-detail__description {
    color: var(--color-text-light);
    line-height: var(--line-height-relaxed);
    margin-bottom: var(--space-lg);
}

.product-detail__specs {
    margin-bottom: var(--space-lg);
}

.product-detail__specs h3 {
    font-size: var(--font-size-lg);
    margin-bottom: var(--space-md);
}

.product-detail__specs ul {
    list-style: disc;
    padding-left: var(--space-xl);
    color: var(--color-text-light);
}

.product-detail__specs li {
    margin-bottom: var(--space-sm);
    line-height: var(--line-height-normal);
}

.product-detail__actions {
    display: flex;
    align-items: flex-end;
    gap: var(--space-md);
    flex-wrap: wrap;
}

.product-detail__actions .form__input {
    width: 80px;
}

/* ==========================================================================
   11. Cart
   ========================================================================== */
.cart {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: var(--space-xl);
    margin-bottom: var(--space-xl);
}

.cart__items {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.cart__item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    text-align: left;
}

.cart__item-info {
    flex: 1;
}

.cart__item-actions {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.cart__item-actions .form__input {
    width: 60px;
}

.cart__summary {
    text-align: left;
    height: fit-content;
    position: sticky;
    top: calc(var(--header-height) + var(--space-md));
}

/* ==========================================================================
   12. Footer
   ========================================================================== */
.footer {
    background-color: var(--color-charcoal);
    color: var(--color-beige-light);
    padding: var(--space-2xl) 0 0;
}

.footer__grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--space-xl);
    margin-bottom: var(--space-xl);
}

.footer__section {
    display: flex;
    flex-direction: column;
}

.footer__title {
    font-size: var(--font-size-xl);
    color: var(--color-beige);
    margin-bottom: var(--space-sm);
    font-family: var(--font-primary);
    letter-spacing: var(--letter-spacing-wide);
}

.footer__subtitle {
    font-size: var(--font-size-md);
    margin-bottom: var(--space-sm);
    font-weight: var(--font-weight-semibold);
    color: var(--color-cream);
}

.footer__description {
    color: var(--color-taupe);
    font-size: var(--font-size-sm);
    line-height: var(--line-height-relaxed);
}

.footer__links {
    list-style: none;
    padding: 0;
    margin: 0;
}

.footer__links li {
    margin-bottom: var(--space-sm);
}

.footer__link {
    color: var(--color-taupe);
    text-decoration: none;
    font-size: var(--font-size-sm);
    transition: color var(--transition-base);
}

.footer__link:hover {
    color: var(--color-beige);
}

.footer__info {
    color: var(--color-taupe);
    font-size: var(--font-size-sm);
    line-height: var(--line-height-relaxed);
}

.footer__social {
    display: flex;
    gap: var(--space-sm);
}

.footer__social-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: var(--radius-full);
    background-color: rgba(255, 255, 255, 0.08);
    color: var(--color-taupe);
    transition: background-color var(--transition-base), color var(--transition-base);
}

.footer__social-link svg {
    display: inline-block;
}

.footer__social-link:hover {
    background-color: var(--color-brown);
    color: var(--color-cream-light);
}

.footer__bottom {
    border-top: var(--border-width) solid rgba(255, 255, 255, 0.1);
    padding: var(--space-lg) 0;
    text-align: center;
}

.footer__bottom p {
    margin: 0;
    opacity: 0.7;
    font-size: var(--font-size-sm);
    color: var(--color-taupe);
}

/* ==========================================================================
   13. Animations
   ========================================================================== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

.animate-in {
    animation: fadeInUp 0.6s ease-out both;
}

/* ==========================================================================
   14. Utility Classes
   ========================================================================== */

/* 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;
}

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

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

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

/* Text colors */
.text-primary {
    color: var(--color-primary);
}

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

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

/* Background colors */
.bg-cream {
    background-color: var(--color-cream);
}

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

.bg-primary {
    background-color: var(--color-primary);
    color: var(--color-white);
}

/* Display */
.d-flex {
    display: flex;
}

.d-grid {
    display: grid;
}

.d-block {
    display: block;
}

.d-none {
    display: none;
}

/* Flex utilities */
.flex-center {
    display: flex;
    align-items: center;
    justify-content: center;
}

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

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

.flex-wrap {
    flex-wrap: wrap;
}

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

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

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

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

/* Spacing: Margin */
.mt-0   { margin-top: 0; }
.mt-sm  { margin-top: var(--space-sm); }
.mt-md  { margin-top: var(--space-md); }
.mt-lg  { margin-top: var(--space-lg); }
.mt-xl  { margin-top: var(--space-xl); }
.mt-2xl { margin-top: var(--space-2xl); }

.mb-0   { margin-bottom: 0; }
.mb-sm  { margin-bottom: var(--space-sm); }
.mb-md  { margin-bottom: var(--space-md); }
.mb-lg  { margin-bottom: var(--space-lg); }
.mb-xl  { margin-bottom: var(--space-xl); }
.mb-2xl { margin-bottom: var(--space-2xl); }

.mx-auto { margin-left: auto; margin-right: auto; }

/* Spacing: Padding */
.p-0    { padding: 0; }
.p-sm   { padding: var(--space-sm); }
.p-md   { padding: var(--space-md); }
.p-lg   { padding: var(--space-lg); }
.p-xl   { padding: var(--space-xl); }

.py-sm  { padding-top: var(--space-sm); padding-bottom: var(--space-sm); }
.py-md  { padding-top: var(--space-md); padding-bottom: var(--space-md); }
.py-lg  { padding-top: var(--space-lg); padding-bottom: var(--space-lg); }
.py-xl  { padding-top: var(--space-xl); padding-bottom: var(--space-xl); }
.py-2xl { padding-top: var(--space-2xl); padding-bottom: var(--space-2xl); }

.px-sm  { padding-left: var(--space-sm); padding-right: var(--space-sm); }
.px-md  { padding-left: var(--space-md); padding-right: var(--space-md); }
.px-lg  { padding-left: var(--space-lg); padding-right: var(--space-lg); }

/* Width */
.w-full {
    width: 100%;
}

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

/* Border utilities */
.border {
    border: var(--border-width) solid var(--color-border);
}

.border-bottom {
    border-bottom: var(--border-width) solid var(--color-border);
}

.rounded {
    border-radius: var(--radius-md);
}

.rounded-sm {
    border-radius: var(--radius-sm);
}

.rounded-lg {
    border-radius: var(--radius-lg);
}

/* Shadow utilities */
.shadow-sm {
    box-shadow: var(--shadow-sm);
}

.shadow-md {
    box-shadow: var(--shadow-md);
}

.shadow-lg {
    box-shadow: var(--shadow-lg);
}

/* ==========================================================================
   15. Responsive Design
   ========================================================================== */
@media (max-width: 768px) {
    :root {
        --font-size-3xl: 2rem;
        --font-size-4xl: 2.5rem;
    }

    .nav__menu {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background-color: var(--color-surface);
        flex-direction: column;
        border-bottom: var(--border-width) solid var(--color-border);
        padding: var(--space-md);
    }

    .nav__menu.active {
        display: flex;
    }

    .nav__toggle {
        display: flex;
    }

    .nav__toggle.active .nav__toggle-line:nth-child(1) {
        transform: rotate(-45deg) translate(-5px, 6px);
    }

    .nav__toggle.active .nav__toggle-line:nth-child(2) {
        opacity: 0;
    }

    .nav__toggle.active .nav__toggle-line:nth-child(3) {
        transform: rotate(45deg) translate(-5px, -6px);
    }

    .hero {
        padding: var(--space-4xl) 0 var(--space-2xl);
    }

    .hero__title {
        font-size: var(--font-size-3xl);
    }

    .hero__subtitle {
        font-size: var(--font-size-base);
    }

    .section {
        padding: var(--space-xl) 0;
    }

    .grid {
        grid-template-columns: 1fr;
        gap: var(--space-md);
    }

    .footer__grid {
        grid-template-columns: 1fr;
        gap: var(--space-lg);
    }

    .product-detail {
        grid-template-columns: 1fr;
        gap: var(--space-lg);
    }

    .cart {
        grid-template-columns: 1fr;
    }

    .cart__item {
        flex-direction: column;
        gap: var(--space-md);
        text-align: center;
    }

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

    .cart__summary {
        position: static;
    }

    /* Responsive utility: hide on mobile */
    .hide-mobile {
        display: none;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--space-sm);
    }

    .hero {
        padding: var(--space-3xl) 0 var(--space-xl);
    }

    .card {
        padding: var(--space-lg);
    }

    .btn--lg {
        padding: var(--space-sm) var(--space-lg);
    }
}

/* Show only on mobile */
@media (min-width: 769px) {
    .show-mobile {
        display: none;
    }
}