/* ==========================================================================
   1. CSS Custom Properties (Variables)
   ========================================================================== */

:root {
    /* Colors */
    --color-bg: #FAFAFA;
    --color-text: #1A1A1A;
    --color-bg-inverted: #1A1A1A;
    --color-text-inverted: #FAFAFA;
    --color-accent: #0072CE;
    --color-accent-hover: #005BA1;
    --color-border: #E0E0E0;

    /* Typography */
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
                 "Helvetica Neue", Arial, sans-serif, "Apple Color Emoji",
                 "Segoe UI Emoji";
    --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo,
                 Consolas, monospace;

    /* Type Scale */
    --text-body: clamp(1rem, 0.95rem + 0.25vw, 1.125rem);
    --text-h1: clamp(2rem, 1.5rem + 2.5vw, 3.5rem);
    --text-h2: clamp(1.5rem, 1.25rem + 1.25vw, 2.25rem);
    --text-h3: clamp(1.125rem, 1rem + 0.5vw, 1.5rem);
    --text-small: 0.875rem;

    /* Spacing */
    --space-xs: 8px;
    --space-sm: 16px;
    --space-md: 24px;
    --space-lg: 32px;
    --space-xl: 48px;
    --space-2xl: 64px;
    --space-3xl: 96px;

    /* Layout */
    --max-width: 1200px;
    --header-height: 64px;
}

/* ==========================================================================
   2. Reset / Normalize
   ========================================================================== */

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

* {
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: var(--header-height);
}

body {
    font-family: var(--font-sans);
    font-size: var(--text-body);
    line-height: 1.5;
    color: var(--color-text);
    background-color: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

ul,
ol {
    list-style: none;
}

a {
    color: var(--color-accent);
    text-decoration: none;
    transition: color 0.2s ease;
}

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

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

table {
    border-collapse: collapse;
    width: 100%;
}

address {
    font-style: normal;
}

/* ==========================================================================
   3. Base Styles (Typography, Links)
   ========================================================================== */

h1,
h2,
h3,
h4,
h5,
h6 {
    line-height: 1.25;
    font-weight: 600;
}

h1 {
    font-size: var(--text-h1);
    font-weight: 700;
}

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

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

p {
    margin-bottom: 1em;
}

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

hr {
    border: none;
    border-top: 1px solid var(--color-border);
    margin: var(--space-lg) 0;
}

/* ==========================================================================
   4. Layout (Container, Grid utilities)
   ========================================================================== */

.container {
    width: 100%;
    max-width: var(--max-width);
    margin-inline: auto;
    padding-inline: var(--space-sm);
}

@media (min-width: 1024px) {
    .container {
        padding-inline: var(--space-md);
    }
}

/* ==========================================================================
   5. Components (Header, Footer, Cards)
   ========================================================================== */

/* ----- Skip Link ----- */
.skip-link {
    position: absolute;
    top: -100%;
    left: var(--space-sm);
    padding: var(--space-xs) var(--space-sm);
    background: var(--color-text);
    color: var(--color-bg);
    z-index: 1000;
    border-radius: 4px;
}

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

/* ----- Header ----- */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    z-index: 100;
}

.site-header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

.logo {
    display: flex;
    align-items: center;
}

.logo img {
    height: 32px;
    width: auto;
}

/* ----- Navigation ----- */
.main-nav {
    display: flex;
    align-items: center;
}

.nav-toggle {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 44px;
    height: 44px;
    padding: var(--space-xs);
}

.nav-toggle-icon,
.nav-toggle-icon::before,
.nav-toggle-icon::after {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--color-text);
    transition: transform 0.3s ease, opacity 0.3s ease;
}

.nav-toggle-icon {
    position: relative;
}

.nav-toggle-icon::before,
.nav-toggle-icon::after {
    content: "";
    position: absolute;
    left: 0;
}

.nav-toggle-icon::before {
    top: -7px;
}

.nav-toggle-icon::after {
    top: 7px;
}

/* Nav toggle open state */
.nav-toggle[aria-expanded="true"] .nav-toggle-icon {
    background: transparent;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-icon::before {
    top: 0;
    transform: rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-icon::after {
    top: 0;
    transform: rotate(-45deg);
}

/* Mobile Nav Menu */
.nav-menu {
    position: fixed;
    top: var(--header-height);
    right: -100%;
    width: min(280px, 80vw);
    height: calc(100vh - var(--header-height));
    background: var(--color-bg);
    border-left: 1px solid var(--color-border);
    padding: var(--space-lg);
    transition: right 0.3s ease;
    overflow-y: auto;
}

.nav-menu.is-open {
    right: 0;
}

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

.nav-menu a {
    display: block;
    padding: var(--space-xs) 0;
    font-size: var(--text-h3);
    color: var(--color-text);
}

.nav-menu a:hover {
    color: var(--color-accent);
}

/* Desktop Navigation */
@media (min-width: 768px) {
    .nav-toggle {
        display: none;
    }

    .nav-menu {
        position: static;
        width: auto;
        height: auto;
        background: transparent;
        border: none;
        padding: 0;
        display: flex;
        gap: var(--space-md);
    }

    .nav-menu li {
        margin-bottom: 0;
    }

    .nav-menu a {
        padding: var(--space-xs);
        font-size: var(--text-body);
    }
}

/* ----- Footer ----- */
.site-footer {
    background: var(--color-bg-inverted);
    color: var(--color-text-inverted);
    padding: var(--space-xl) 0;
    margin-top: var(--space-3xl);
}

.site-footer .container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-md);
    text-align: center;
}

.footer-nav ul {
    display: flex;
    gap: var(--space-md);
}

.footer-nav a {
    color: var(--color-text-inverted);
    font-size: var(--text-small);
}

.footer-nav a:hover {
    color: var(--color-accent);
}

.footer-nav a[aria-current="page"] {
    text-decoration: underline;
}

.copyright {
    font-size: var(--text-small);
    opacity: 0.8;
}

/* ----- Portfolio Card ----- */
.portfolio-card {
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    overflow: hidden;
    max-width: 600px;
}

.portfolio-card img {
    width: 100%;
    aspect-ratio: 4/3;
    object-fit: cover;
    background: var(--color-border);
}

.portfolio-card-content {
    padding: var(--space-md);
}

.portfolio-card h3 {
    margin-bottom: var(--space-xs);
}

.portfolio-link {
    display: inline-block;
    margin-top: var(--space-sm);
    font-weight: 600;
}

/* ==========================================================================
   6. Sections (Hero, About, Services, Portfolio, Contact)
   ========================================================================== */

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

@media (min-width: 1024px) {
    .section {
        padding: var(--space-3xl) 0;
    }
}

.section h2 {
    margin-bottom: var(--space-lg);
}

/* ----- Hero ----- */
.hero {
    min-height: calc(100vh - var(--header-height));
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding-top: var(--header-height);
}

.hero .container {
    padding-top: var(--space-2xl);
    padding-bottom: var(--space-2xl);
}

.hero h1 {
    margin-bottom: var(--space-md);
}

.tagline {
    font-size: var(--text-h3);
    color: var(--color-text);
    opacity: 0.8;
    margin-inline: auto;
}

@media (min-width: 768px) {
    .tagline {
        white-space: nowrap;
    }
}

/* ----- Services ----- */
.services-list {
    display: grid;
    gap: var(--space-lg);
}

@media (min-width: 768px) {
    .services-list {
        grid-template-columns: repeat(3, 1fr);
    }
}

.service-item {
    padding: var(--space-md);
    border: 1px solid var(--color-border);
    border-radius: 8px;
}

.service-item h3 {
    margin-bottom: var(--space-xs);
}

/* ----- Contact ----- */
.contact-email {
    display: inline-block;
    font-size: var(--text-h3);
    font-weight: 600;
    margin-top: var(--space-sm);
}

/* ==========================================================================
   7. Utilities (Visually hidden, etc.)
   ========================================================================== */

.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* ==========================================================================
   8. Legal Pages
   ========================================================================== */

.legal-page {
    padding-top: calc(var(--header-height) + var(--space-2xl));
    padding-bottom: var(--space-2xl);
}

.legal-page h1 {
    margin-bottom: var(--space-sm);
}

.legal-meta {
    color: var(--color-text);
    opacity: 0.7;
    margin-bottom: var(--space-lg);
}

.legal-page section {
    margin-bottom: var(--space-xl);
}

.legal-page section:last-child {
    margin-bottom: 0;
}

.legal-page h2 {
    margin-bottom: var(--space-sm);
    padding-top: var(--space-md);
}

.legal-page h3 {
    margin-top: var(--space-md);
    margin-bottom: var(--space-xs);
}

.legal-page ul {
    list-style: disc;
    padding-left: var(--space-md);
    margin-bottom: 1em;
}

.legal-page li {
    margin-bottom: 0.5em;
}

.legal-page table {
    margin: var(--space-md) 0;
    font-size: var(--text-small);
}

.legal-page th,
.legal-page td {
    padding: var(--space-xs) var(--space-sm);
    border: 1px solid var(--color-border);
    text-align: left;
    vertical-align: top;
}

.legal-page th {
    background: var(--color-border);
    font-weight: 600;
}

.legal-page address {
    margin: var(--space-sm) 0;
    line-height: 1.8;
}

/* ==========================================================================
   9. Focus States (Accessibility)
   ========================================================================== */

:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
}

/* ==========================================================================
   10. Media Queries
   ========================================================================== */

/* Already included inline above for component-specific breakpoints */