/* ============================================
   DESIGN SYSTEM — Joshua Knott Portfolio
   Inspired by Cursor's warm, minimal aesthetic
   ============================================ */

/* --- Tokens --- */
:root {
  /* Colours */
  --color-bg: #f7f7f4;
  --color-text: #26251e;
  --color-text-secondary: rgba(38, 37, 30, 0.55);
  --color-text-tertiary: rgba(38, 37, 30, 0.35);
  --color-divider: rgba(38, 37, 30, 0.08);
  --color-link-hover: #26251e;

  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-size-xs: 0.8125rem;   /* 13px */
  --font-size-sm: 0.875rem;    /* 14px */
  --font-size-base: 1rem;      /* 16px */
  --font-size-lg: 1.125rem;    /* 18px */
  --font-size-xl: 1.25rem;     /* 20px */
  --font-size-2xl: 1.5rem;     /* 24px */
  --font-size-hero: clamp(2.5rem, 6vw, 4.5rem);

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --space-4xl: 6rem;

  /* Layout */
  --max-width: 640px;

  /* Transitions */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --duration-fast: 150ms;
  --duration-normal: 400ms;
  --duration-slow: 800ms;
}

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

html {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
  min-height: 100vh;
  overflow-x: hidden;
}

a {
  color: var(--color-text-secondary);
  text-decoration: none;
  transition: color var(--duration-fast) ease;
}

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

ul {
  list-style: none;
}

/* --- Intro Screen --- */
.intro {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--color-bg);
  z-index: 100;
  transition: opacity var(--duration-slow) var(--ease-out);
}

.intro.hidden {
  opacity: 0;
  pointer-events: none;
}

.intro__content {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  max-width: 90%;
}

.intro__text {
  font-size: var(--font-size-hero);
  font-weight: 300;
  letter-spacing: -0.03em;
  color: var(--color-text);
  white-space: nowrap;
  margin: 0;
}

.intro__subtext {
  font-size: clamp(1.25rem, 3.5vw, 2.25rem);
  font-weight: 300;
  letter-spacing: -0.02em;
  color: var(--color-text-secondary);
  white-space: nowrap;
  margin: var(--space-xs) 0 0 0;
}

.intro__cursor {
  display: inline-block;
  width: 2px;
  height: 0.85em;
  background-color: var(--color-text);
  margin-left: 2px;
  vertical-align: text-bottom;
  animation: blink 1s step-end infinite;
}

.intro__cursor.hidden {
  display: none;
}

@keyframes blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0; }
}

/* --- Portfolio Container --- */
.portfolio {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity var(--duration-slow) var(--ease-out),
              transform var(--duration-slow) var(--ease-out);
  pointer-events: none;
  min-height: 100vh;
}

.portfolio.visible {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

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

/* --- Header --- */
.header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: var(--space-3xl);
}

.header__name {
  font-size: var(--font-size-xl);
  font-weight: 500;
  letter-spacing: -0.02em;
  color: var(--color-text);
}

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

.header__socials a {
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-tertiary);
  transition: color var(--duration-fast) ease;
}

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

.header__socials svg {
  width: 18px;
  height: 18px;
}

/* --- Sections --- */
.section {
  margin-bottom: var(--space-3xl);
}

.section__title {
  font-size: var(--font-size-xs);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-tertiary);
  margin-bottom: var(--space-lg);
}

/* --- About --- */
.about__text {
  font-size: var(--font-size-lg);
  line-height: 1.6;
  color: var(--color-text-secondary);
  max-width: 560px;
}

.about__text:not(:last-child) {
  margin-bottom: var(--space-md);
}

/* --- Projects --- */
.project {
  padding: var(--space-xl) 0;
  border-bottom: 1px solid var(--color-divider);
}

.project:first-child {
  border-top: 1px solid var(--color-divider);
}

.project__header {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-sm);
}

.project__name {
  font-size: var(--font-size-base);
  font-weight: 500;
  color: var(--color-text);
}

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

.project__link {
  display: flex;
  align-items: center;
  color: var(--color-text-tertiary);
  transition: color var(--duration-fast) ease;
}

.project__link:hover {
  color: var(--color-text);
}

.project__link svg {
  width: 15px;
  height: 15px;
}

.project__description {
  font-size: var(--font-size-sm);
  line-height: 1.65;
  color: var(--color-text-secondary);
  max-width: 520px;
}

.project__sites {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-xs) var(--space-md);
  margin-top: var(--space-sm);
}

.project__site-link {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: var(--font-size-xs);
  color: var(--color-text-tertiary);
  transition: color var(--duration-fast) ease;
}

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

.project__site-link svg {
  width: 12px;
  height: 12px;
}

/* --- Scroll Animations --- */
.fade-in {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity var(--duration-slow) var(--ease-out),
              transform var(--duration-slow) var(--ease-out);
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Staggered delays */
.fade-in:nth-child(1) { transition-delay: 0ms; }
.fade-in:nth-child(2) { transition-delay: 80ms; }
.fade-in:nth-child(3) { transition-delay: 160ms; }
.fade-in:nth-child(4) { transition-delay: 240ms; }
.fade-in:nth-child(5) { transition-delay: 320ms; }
.fade-in:nth-child(6) { transition-delay: 400ms; }

/* --- Responsive --- */
@media (max-width: 480px) {
  .container {
    padding: var(--space-2xl) var(--space-md);
  }

  .header {
    flex-direction: column;
    gap: var(--space-md);
    margin-bottom: var(--space-2xl);
  }

  .intro__text {
    white-space: normal;
    text-align: center;
    padding: 0 var(--space-md);
  }

  .project__header {
    flex-wrap: wrap;
  }

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

/* --- Accessibility --- */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  .fade-in {
    opacity: 1;
    transform: none;
  }

  .portfolio {
    opacity: 1;
    transform: none;
    pointer-events: auto;
  }

  .intro {
    display: none;
  }
}