/* Portfolio - Based on Purissimo Design System */
/* Zero JavaScript. Maximum accessibility. */

@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;500;600;700&display=swap');

/* ============================================
   CSS CUSTOM PROPERTIES (TOKENS)
   ============================================ */
:root {
  /* Colors - Glacial Palette */
  --color-pure-white: #ffffff;
  --color-ice-white: #f8fafc;
  --color-frost: #e2e8f0;
  --color-mist: #cbd5e1;
  --color-gray-300: #94a3b8;
  --color-gray-500: #64748b;
  --color-gray-700: #334155;
  --color-gray-800: #1e293b;
  --color-gray-900: #0f172a;
  --color-glacial-100: #e0f2fe;
  --color-glacial-300: #7dd3fc;
  --color-glacial-500: #0ea5e9;
  --color-glacial-700: #0369a1;
  --color-glacial-900: #0c4a6e;
  --color-action: var(--color-glacial-500);
  --color-action-hover: var(--color-glacial-700);

  /* Typography */
  --font-family-base: 'Outfit', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 2rem;
  --text-4xl: 2.5rem;
  --text-5xl: 3rem;

  /* Font Weights */
  --font-light: 300;
  --font-regular: 400;
  --font-medium: 500;
  --font-semibold: 600;
  --font-bold: 700;

  /* Spacing (Base-4) */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-8: 32px;
  --space-10: 40px;
  --space-12: 48px;
  --space-16: 64px;
  --space-20: 80px;
  --space-24: 96px;

  /* Border Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-2xl: 24px;

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);

  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-base: 0.2s ease;
  --transition-slow: 0.3s ease;

  /* Layout */
  --max-width: 1200px;
  --max-width-content: 800px;
  --header-height: 72px;
}

/* ============================================
   RESET & BASE
   ============================================ */
*,
*::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-family-base);
  font-size: var(--text-base);
  font-weight: var(--font-regular);
  line-height: 1.6;
  color: var(--color-gray-800);
  background-color: var(--color-pure-white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ============================================
   TYPOGRAPHY
   ============================================ */
h1, h2, h3, h4, h5, h6 {
  font-weight: var(--font-semibold);
  line-height: 1.25;
  color: var(--color-gray-900);
}

h1 {
  font-size: var(--text-4xl);
  font-weight: var(--font-bold);
  letter-spacing: -0.02em;
}

h2 {
  font-size: var(--text-3xl);
  letter-spacing: -0.01em;
}

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

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

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

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

a {
  color: var(--color-action);
  text-decoration: none;
  transition: color var(--transition-base);
}

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

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

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

ul, ol {
  padding-left: var(--space-6);
  margin-bottom: var(--space-4);
}

li {
  margin-bottom: var(--space-2);
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* ============================================
   LAYOUT
   ============================================ */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

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

.section {
  padding: var(--space-16) 0;
}

.section--hero {
  padding: var(--space-20) 0 var(--space-16);
}

/* ============================================
   HEADER
   ============================================ */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-frost);
  height: var(--header-height);
}

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

.header__logo {
  font-size: var(--text-lg);
  font-weight: var(--font-semibold);
  color: var(--color-gray-900);
  text-decoration: none;
  transition: color var(--transition-base);
}

.header__logo:hover {
  color: var(--color-action);
}

.header__nav {
  display: flex;
  align-items: center;
  gap: var(--space-8);
}

.header__nav-link {
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  color: var(--color-gray-500);
  text-decoration: none;
  transition: color var(--transition-base);
  padding: var(--space-2) 0;
}

.header__nav-link:hover,
.header__nav-link--active {
  color: var(--color-gray-900);
}

/* Mobile Navigation */
.header__menu-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-2);
  color: var(--color-gray-700);
}

.header__menu-toggle svg {
  width: 24px;
  height: 24px;
}

@media (max-width: 768px) {
  .header__nav {
    display: none;
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: var(--color-pure-white);
    flex-direction: column;
    padding: var(--space-6);
    gap: var(--space-4);
    border-bottom: 1px solid var(--color-frost);
    box-shadow: var(--shadow-lg);
  }

  .header__nav--open {
    display: flex;
  }

  .header__menu-toggle {
    display: block;
  }
}

/* ============================================
   HERO SECTION
   ============================================ */
.hero {
  text-align: center;
  padding: var(--space-24) 0 var(--space-16);
}

.hero__title {
  font-size: var(--text-5xl);
  font-weight: var(--font-bold);
  margin-bottom: var(--space-4);
  letter-spacing: -0.03em;
}

.hero__subtitle {
  font-size: var(--text-lg);
  color: var(--color-gray-500);
  font-weight: var(--font-light);
  max-width: 600px;
  margin: 0 auto var(--space-8);
}

.hero__links {
  display: flex;
  justify-content: center;
  gap: var(--space-6);
  flex-wrap: wrap;
}

.hero__link {
  font-size: var(--text-sm);
  color: var(--color-gray-500);
  transition: color var(--transition-base);
}

.hero__link:hover {
  color: var(--color-action);
}

@media (max-width: 768px) {
  .hero__title {
    font-size: var(--text-3xl);
  }

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

/* ============================================
   PROJECT GRID
   ============================================ */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-8);
}

@media (max-width: 900px) {
  .projects-grid {
    grid-template-columns: 1fr;
  }
}

/* ============================================
   PROJECT CARD
   ============================================ */
.project-card {
  display: block;
  text-decoration: none;
  border-radius: var(--radius-xl);
  overflow: hidden;
  background: var(--color-ice-white);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

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

.project-card:focus-visible {
  outline: 2px solid var(--color-action);
  outline-offset: 4px;
}

.project-card__image {
  aspect-ratio: 16 / 10;
  overflow: hidden;
  background: var(--color-frost);
}

.project-card__image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.project-card:hover .project-card__image img {
  transform: scale(1.03);
}

.project-card__content {
  padding: var(--space-6);
}

.project-card__title {
  font-size: var(--text-xl);
  font-weight: var(--font-semibold);
  color: var(--color-gray-900);
  margin-bottom: var(--space-2);
}

.project-card__tagline {
  font-size: var(--text-sm);
  color: var(--color-gray-500);
  font-weight: var(--font-light);
}

/* ============================================
   PROJECT PAGE
   ============================================ */
.project-hero {
  padding: var(--space-16) 0;
  background: linear-gradient(180deg, var(--color-ice-white) 0%, var(--color-pure-white) 100%);
}

.project-hero__title {
  font-size: var(--text-4xl);
  margin-bottom: var(--space-4);
}

.project-hero__tagline {
  font-size: var(--text-xl);
  color: var(--color-gray-500);
  font-weight: var(--font-light);
  margin-bottom: var(--space-6);
}

.project-hero__links {
  display: flex;
  gap: var(--space-4);
  flex-wrap: wrap;
}

.project-hero__link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  color: var(--color-action);
  padding: var(--space-2) var(--space-4);
  border: 1px solid var(--color-action);
  border-radius: var(--radius-md);
  transition: background-color var(--transition-base), color var(--transition-base);
}

.project-hero__link:hover {
  background-color: var(--color-action);
  color: var(--color-pure-white);
}

@media (max-width: 768px) {
  .project-hero__title {
    font-size: var(--text-3xl);
  }

  .project-hero__tagline {
    font-size: var(--text-lg);
  }
}

/* ============================================
   PROJECT CONTENT
   ============================================ */
.project-content {
  padding: var(--space-12) 0;
}

.project-section {
  margin-bottom: var(--space-12);
}

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

.project-section__title {
  font-size: var(--text-sm);
  font-weight: var(--font-semibold);
  color: var(--color-action);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: var(--space-4);
}

.project-section__content {
  font-size: var(--text-lg);
  color: var(--color-gray-700);
  line-height: 1.75;
}

.project-section__content p {
  margin-bottom: var(--space-4);
}

/* Key Points List */
.key-points {
  list-style: none;
  padding: 0;
  margin: 0;
}

.key-points li {
  position: relative;
  padding-left: var(--space-6);
  margin-bottom: var(--space-3);
  color: var(--color-gray-700);
}

.key-points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 8px;
  height: 8px;
  background: var(--color-glacial-300);
  border-radius: 50%;
}

/* Results Grid */
.results-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: var(--space-4);
  margin-top: var(--space-6);
}

.result-item {
  text-align: center;
  padding: var(--space-6);
  background: var(--color-ice-white);
  border-radius: var(--radius-lg);
}

.result-item__value {
  font-size: var(--text-3xl);
  font-weight: var(--font-bold);
  color: var(--color-glacial-700);
  margin-bottom: var(--space-1);
}

.result-item__label {
  font-size: var(--text-sm);
  color: var(--color-gray-500);
}

/* ============================================
   PROJECT GALLERY
   ============================================ */
.project-gallery {
  padding: var(--space-12) 0;
  background: var(--color-ice-white);
}

.project-gallery__title {
  font-size: var(--text-2xl);
  text-align: center;
  margin-bottom: var(--space-8);
}

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

.gallery-grid--single {
  grid-template-columns: 1fr;
}

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

@media (max-width: 768px) {
  .gallery-grid--double {
    grid-template-columns: 1fr;
  }
}

.gallery-item {
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
}

.gallery-item img {
  width: 100%;
  height: auto;
}

/* ============================================
   PROJECT NAVIGATION
   ============================================ */
.project-nav {
  padding: var(--space-12) 0;
  border-top: 1px solid var(--color-frost);
}

.project-nav__inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-4);
}

.project-nav__link {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  text-decoration: none;
  padding: var(--space-4);
  border-radius: var(--radius-md);
  transition: background-color var(--transition-base);
  max-width: 45%;
}

.project-nav__link:hover {
  background-color: var(--color-ice-white);
}

.project-nav__link--prev {
  align-items: flex-start;
}

.project-nav__link--next {
  align-items: flex-end;
  margin-left: auto;
}

.project-nav__label {
  font-size: var(--text-xs);
  color: var(--color-gray-500);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.project-nav__title {
  font-size: var(--text-base);
  font-weight: var(--font-medium);
  color: var(--color-gray-900);
}

@media (max-width: 600px) {
  .project-nav__inner {
    flex-direction: column;
  }

  .project-nav__link {
    max-width: 100%;
    width: 100%;
  }

  .project-nav__link--next {
    align-items: flex-start;
  }
}

/* ============================================
   ABOUT PAGE
   ============================================ */
.about-hero {
  padding: var(--space-16) 0;
  text-align: center;
}

.about-hero__name {
  font-size: var(--text-4xl);
  margin-bottom: var(--space-2);
}

.about-hero__title {
  font-size: var(--text-lg);
  color: var(--color-gray-500);
  font-weight: var(--font-light);
  margin-bottom: var(--space-4);
}

.about-hero__location {
  font-size: var(--text-sm);
  color: var(--color-gray-400);
}

.about-content {
  padding: var(--space-8) 0 var(--space-16);
}

.about-bio {
  font-size: var(--text-xl);
  line-height: 1.8;
  color: var(--color-gray-700);
  margin-bottom: var(--space-12);
}

.about-section {
  margin-bottom: var(--space-10);
}

.about-section__title {
  font-size: var(--text-lg);
  font-weight: var(--font-semibold);
  color: var(--color-gray-900);
  margin-bottom: var(--space-4);
  padding-bottom: var(--space-2);
  border-bottom: 2px solid var(--color-glacial-300);
}

.contact-list {
  list-style: none;
  padding: 0;
}

.contact-list li {
  margin-bottom: var(--space-3);
}

.contact-list a {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  color: var(--color-gray-700);
  transition: color var(--transition-base);
}

.contact-list a:hover {
  color: var(--color-action);
}

/* ============================================
   FOOTER
   ============================================ */
.footer {
  padding: var(--space-8) 0;
  border-top: 1px solid var(--color-frost);
  background: var(--color-ice-white);
}

.footer__inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-4);
}

.footer__copyright {
  font-size: var(--text-sm);
  color: var(--color-gray-500);
}

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

.footer__link {
  font-size: var(--text-sm);
  color: var(--color-gray-500);
  transition: color var(--transition-base);
}

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

@media (max-width: 600px) {
  .footer__inner {
    flex-direction: column;
    text-align: center;
  }
}

/* ============================================
   UTILITIES
   ============================================ */
.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-center {
  text-align: center;
}

.mb-0 {
  margin-bottom: 0;
}

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

/* Lazy Loading */
img[loading="lazy"] {
  opacity: 1;
  transition: opacity var(--transition-base);
}

/* Focus Visible */
: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;
  }
}