/* ==========================================================================
   1. Custom Properties
   ========================================================================== */

:root {
  /* Colour palette */
  --color-bg: #FAFAF8;
  --color-text: #1A1A1A;
  --color-text-muted: #6B6B6B;
  --color-border: #E5E5E3;

  /* Accent pops */
  --color-coral: #FF6B6B;
  --color-yellow: #FFD93D;
  --color-blue: #4DABF7;
  --color-green: #69DB7C;
  --color-purple: #B197FC;

  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-size-base: 1.125rem;
  --font-size-lg: 1.5rem;
  --font-size-xl: 2.25rem;
  --font-size-2xl: 3rem;
  --font-size-sm: 0.875rem;
  --line-height: 1.7;
  --line-height-tight: 1.2;

  /* Spacing (8px base) */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 2rem;
  --space-lg: 4rem;
  --space-xl: 6rem;
  --space-2xl: 8rem;

  /* Layout */
  --max-width: 680px;
  --max-width-wide: 900px;
}

/* ==========================================================================
   1b. Dark Mode
   ========================================================================== */

/* JS-driven dark mode */
[data-theme="dark"] {
  --color-bg: #1A1A1A;
  --color-text: #E8E8E6;
  --color-text-muted: #A0A0A0;
  --color-border: #333333;
}

/* No-JS fallback: respect OS preference when no data-theme is set */
@media (prefers-color-scheme: dark) {
  html:not([data-theme]) {
    --color-bg: #1A1A1A;
    --color-text: #E8E8E6;
    --color-text-muted: #A0A0A0;
    --color-border: #333333;
  }
}

/* ==========================================================================
   2. Reset / Base
   ========================================================================== */

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

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

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: var(--line-height);
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color 0.3s ease, color 0.3s ease;
}

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

a {
  color: var(--color-text);
  text-decoration-color: var(--color-coral);
  text-decoration-thickness: 2px;
  text-underline-offset: 3px;
  transition: text-decoration-color 0.2s ease;
}

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

a:focus-visible {
  outline: 2px solid var(--color-blue);
  outline-offset: 3px;
  border-radius: 2px;
}

/* ==========================================================================
   3. Typography
   ========================================================================== */

h1, h2, h3 {
  line-height: var(--line-height-tight);
  font-weight: 700;
}

.section__heading {
  font-size: clamp(1.5rem, 3vw, var(--font-size-xl));
  margin-bottom: var(--space-md);
}

/* ==========================================================================
   4. Layout
   ========================================================================== */

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

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

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

/* ==========================================================================
   5a. Hero
   ========================================================================== */

.hero {
  padding-top: var(--space-2xl);
  padding-bottom: var(--space-lg);
  text-align: center;
}

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

.hero__photo-wrapper {
  width: 160px;
  height: 160px;
  border-radius: 50%;
  overflow: hidden;
  border: 3px solid var(--color-border);
  flex-shrink: 0;
}

.hero__photo {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* Placeholder when no photo is available */
.hero__photo-wrapper:has(img[src=""]),
.hero__photo-wrapper:has(img:not([src])) {
  background: linear-gradient(135deg, var(--color-coral), var(--color-blue));
}

.hero__photo-wrapper img:not([src]),
.hero__photo-wrapper img[src=""] {
  opacity: 0;
}

.hero__heading {
  font-size: clamp(2rem, 5vw, var(--font-size-2xl));
  margin-top: var(--space-sm);
}

.hero__name {
  position: relative;
  display: inline-block;
}

.hero__subtitle {
  font-size: var(--font-size-base);
  color: var(--color-text-muted);
  max-width: 500px;
  margin-top: var(--space-xs);
}

/* ==========================================================================
   5b. About
   ========================================================================== */

.about__content {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.about__content p {
  max-width: 65ch;
}

/* ==========================================================================
   5c. Tech & Tools
   ========================================================================== */

.tech__grid {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: var(--space-md);
  text-align: center;
}

.tech__item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-sm);
  border-radius: 12px;
  transition: background-color 0.2s ease;
  animation: float 3.5s ease-in-out infinite;
}

.tech__item:nth-child(1)  { animation-delay: 0s; }
.tech__item:nth-child(2)  { animation-delay: 0.3s; }
.tech__item:nth-child(3)  { animation-delay: 0.6s; }
.tech__item:nth-child(4)  { animation-delay: 0.9s; }
.tech__item:nth-child(5)  { animation-delay: 1.2s; }
.tech__item:nth-child(6)  { animation-delay: 1.5s; }
.tech__item:nth-child(7)  { animation-delay: 1.8s; }
.tech__item:nth-child(8)  { animation-delay: 2.1s; }
.tech__item:nth-child(9)  { animation-delay: 2.4s; }
.tech__item:nth-child(10) { animation-delay: 0.15s; }
.tech__item:nth-child(11) { animation-delay: 0.45s; }
.tech__item:nth-child(12) { animation-delay: 0.75s; }
.tech__item:nth-child(13) { animation-delay: 1.05s; }
.tech__item:nth-child(14) { animation-delay: 1.35s; }
.tech__item:nth-child(15) { animation-delay: 1.65s; }
.tech__item:nth-child(16) { animation-delay: 1.95s; }
.tech__item:nth-child(17) { animation-delay: 2.25s; }

.tech__item:hover {
  background-color: rgba(0, 0, 0, 0.03);
}

[data-theme="dark"] .tech__item:hover {
  background-color: rgba(255, 255, 255, 0.05);
}

[data-theme="dark"] .tech__icon {
  filter: invert(1) hue-rotate(180deg);
}

@media (prefers-color-scheme: dark) {
  html:not([data-theme]) .tech__item:hover {
    background-color: rgba(255, 255, 255, 0.05);
  }
  html:not([data-theme]) .tech__icon {
    filter: invert(1) hue-rotate(180deg);
  }
}

.tech__icon {
  width: 40px;
  height: 40px;
  object-fit: contain;
}

.tech__label {
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-text-muted);
}

@keyframes float {
  0%, 100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-6px);
  }
}

/* ==========================================================================
   5d. Quote
   ========================================================================== */

.quote {
  padding-block: var(--space-2xl);
  text-align: center;
}

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

.quote__scar {
  width: 120px;
  height: auto;
  opacity: 0.7;
}

.quote__scar--bottom {
  transform: scaleX(-1);
}

.quote__text p {
  font-size: clamp(1.25rem, 3vw, var(--font-size-xl));
  font-weight: 500;
  line-height: 1.4;
  max-width: 600px;
  font-style: italic;
  color: var(--color-text);
}

.quote__attribution {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  font-style: normal;
}

/* ==========================================================================
   5e. Footer
   ========================================================================== */

.footer {
  padding-block: var(--space-lg);
  text-align: center;
}

.footer__divider {
  width: 60px;
  height: 2px;
  background: var(--color-border);
  margin: 0 auto var(--space-md);
  border-radius: 2px;
}

.footer__social-list {
  list-style: none;
  display: flex;
  justify-content: center;
  gap: var(--space-md);
  padding-bottom: var(--space-md);
}

.footer__social-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  color: var(--color-text-muted);
  text-decoration: none;
  transition: color 0.2s ease, transform 0.2s ease;
}

.footer__social-link:hover {
  color: var(--color-text);
  transform: translateY(-2px);
}

.footer__social-link:focus-visible {
  outline: 2px solid var(--color-blue);
  outline-offset: 3px;
}

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

/* ==========================================================================
   5f. Theme Toggle
   ========================================================================== */

.theme-toggle {
  position: fixed;
  top: var(--space-sm);
  right: var(--space-sm);
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border: 2px solid var(--color-border);
  border-radius: 50%;
  background-color: var(--color-bg);
  color: var(--color-text-muted);
  cursor: pointer;
  transition: color 0.2s ease, border-color 0.2s ease, background-color 0.3s ease, transform 0.2s ease;
}

.theme-toggle:hover {
  color: var(--color-text);
  transform: scale(1.05);
}

.theme-toggle:focus-visible {
  outline: 2px solid var(--color-blue);
  outline-offset: 3px;
}

/* In light mode: show moon, hide sun */
.theme-toggle__icon--sun {
  display: none;
}

.theme-toggle__icon--moon {
  display: block;
}

/* In dark mode: show sun, hide moon */
[data-theme="dark"] .theme-toggle__icon--sun {
  display: block;
}

[data-theme="dark"] .theme-toggle__icon--moon {
  display: none;
}

/* No-JS fallback for icon visibility */
@media (prefers-color-scheme: dark) {
  html:not([data-theme]) .theme-toggle__icon--sun {
    display: block;
  }
  html:not([data-theme]) .theme-toggle__icon--moon {
    display: none;
  }
}

/* ==========================================================================
   6. Scroll Animations
   ========================================================================== */

.fade-in {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* ==========================================================================
   7. 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;
  }

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

/* ==========================================================================
   8. Media Queries
   ========================================================================== */

@media (min-width: 48em) {
  .container {
    padding-inline: var(--space-md);
  }

  .hero {
    padding-top: calc(var(--space-2xl) + var(--space-lg));
  }
}