/* ========================================
   DESIGN TOKENS
   Colors, typography, spacing, and motion
   ======================================== */

@import url('https://fonts.googleapis.com/css2?family=Source+Sans+3:wght@400;700&family=Raleway:wght@400;800&display=swap');

:root {
  /* Colors */
  --color-bg: #ffffff;
  --color-bg-alt: #f5f5f7;
  --color-bg-offset: #fafafa;
  --color-fg: #1d1d1f;
  --color-fg-bold: #000000;
  --color-fg-light: #6e6e73;
  --color-border: #d2d2d7;
  --color-border-bg: #f5f5f7;
  --color-accent: #2e59ba;
  --color-accent-light: rgba(46, 89, 186, 0.1);
  --color-accent-subtle: rgba(46, 89, 186, 0.05);
  --color-accent-border: rgba(46, 89, 186, 0.3);
  --color-accent-underline: rgba(46, 89, 186, 0.4);

  /* Typography */
  --font-sans: 'Source Sans 3', 'Source Sans Pro', Helvetica, sans-serif;
  --font-heading: 'Raleway', Helvetica, sans-serif;
  --font-mono: 'Courier New', monospace;

  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  --font-weight-black: 800;

  --text-2xs: 0.65em;
  --text-xs: 0.75em;
  --text-sm: 0.875em;
  --text-base: 1em;
  --text-md: 1.1em;
  --text-lg: 1.3em;
  --text-xl: 1.6em;
  --text-2xl: 2.2em;
  --text-3xl: 2.75em;

  --tracking-tight: 0.01em;
  --tracking-normal: 0.02em;
  --tracking-wide: 0.04em;

  --leading-tight: 1.3;
  --leading-normal: 1.7;
  --leading-loose: 2;

  /* Spacing */
  --space-xs: 0.5rem;
  --space-sm: 0.75rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;

  --spacing-element: 1.5rem;

  /* Border Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-full: 9999px;
  --border-radius: 8px;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.1);

  /* Motion */
  --duration-fast: 150ms;
  --duration-normal: 250ms;
  --duration-slow: 400ms;
  --ease-out: cubic-bezier(0.33, 1, 0.68, 1);
  --ease-in-out: cubic-bezier(0.65, 0, 0.35, 1);

  /* Layout */
  --header-height: 64px;
  --lift-sm: -2px;
}

/* ========================================
   BASE STYLES
   ======================================== */

* {
  box-sizing: border-box;
}

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  margin: 0;
  padding: 0;
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: var(--leading-normal);
  color: var(--color-fg);
  background-color: var(--color-bg);
}

h1, h2, h3, h4, h5, h6 {
  color: var(--color-fg-bold);
  font-family: var(--font-heading);
  font-weight: var(--font-weight-bold);
  letter-spacing: var(--tracking-tight);
  line-height: var(--leading-tight);
  margin: 0 0 0.75em 0;
}

h1 { font-size: var(--text-3xl); }
h2 { font-size: var(--text-2xl); }
h3 { font-size: var(--text-xl); }
h4 { font-size: var(--text-lg); }
h5 { font-size: var(--text-md); }
h6 { font-size: var(--text-base); }

p {
  margin: 0 0 var(--spacing-element) 0;
}

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

a:hover {
  color: var(--color-fg-bold);
}

strong, b {
  color: var(--color-fg-bold);
  font-weight: var(--font-weight-medium);
}

/* ========================================
   HEADER & NAVIGATION
   ======================================== */

.site-header {
  align-items: center;
  background-color: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: solid 1px var(--color-border);
  display: flex;
  height: var(--header-height);
  justify-content: space-between;
  left: 0;
  padding: 0 1.5rem;
  position: fixed;
  top: 0;
  width: 100%;
  z-index: 1000;
  transition: background-color var(--duration-fast) var(--ease-out);
  box-sizing: border-box;
}

.site-logo {
  display: flex;
  align-items: center;
  text-decoration: none;
}

.logo-text {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--font-weight-black);
  color: var(--color-fg-bold);
  letter-spacing: var(--tracking-tight);
}

.nav-links {
  display: flex;
  gap: 0.625rem;
}

.nav-link {
  position: relative;
  padding: 0.75rem 1.125rem;
  font-size: 1.0625rem;
  font-weight: var(--font-weight-bold);
  color: var(--color-fg-bold);
  text-decoration: none;
  border-radius: var(--radius-sm);
  letter-spacing: 0.01em;
  transition: color var(--duration-fast) var(--ease-out),
    background-color var(--duration-fast) var(--ease-out);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0.375rem;
  left: 0.5rem;
  right: 0.5rem;
  height: 2.5px;
  background: var(--color-accent);
  border-radius: 2px;
  transform: scaleX(0);
  transition: transform var(--duration-fast) var(--ease-out);
}

.nav-link:hover {
  color: var(--color-accent);
  background-color: var(--color-border-bg);
}

.nav-link:hover::after {
  transform: scaleX(1);
}

.nav-link.active {
  color: var(--color-accent);
  background-color: var(--color-accent-light);
}

.nav-link.active::after {
  transform: scaleX(1);
}

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

.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.nav-social {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.nav-social-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  color: var(--color-fg);
  text-decoration: none;
  border-radius: var(--radius-sm);
  transition: color var(--duration-fast) var(--ease-out),
    background-color var(--duration-fast) var(--ease-out);
}

.nav-social-link:hover {
  color: var(--color-accent);
  background-color: var(--color-border-bg);
}

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

.nav-social-link i {
  font-size: 20px;
}

@media (max-width: 768px) {
  .site-header {
    padding: 0 1rem;
  }

  .nav-links {
    gap: 0.25rem;
  }

  .nav-link {
    padding: 0.625rem 0.875rem;
    font-size: var(--text-base);
  }

  .nav-social {
    gap: 0;
  }

  .nav-social-link {
    width: 36px;
    height: 36px;
  }

  .nav-social-link i {
    font-size: 18px;
  }
}

/* ========================================
   HERO SECTION
   ======================================== */

.hero {
  position: relative;
  padding: 6rem 2rem 5rem;
  padding-top: calc(var(--header-height) + 4rem);
  text-align: center;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 680px;
  margin: 0 auto;
}

/* Portrait */
.hero-avatar {
  width: 250px;
  height: 250px;
  margin: 0 auto 1.5rem;
  border-radius: 50%;
  position: relative;
  box-shadow: var(--shadow-xl), 0 0 0 1px var(--color-border);
  transition: transform var(--duration-normal) var(--ease-out),
    box-shadow var(--duration-normal) var(--ease-out);
}

.hero-avatar::before {
  content: '';
  position: absolute;
  inset: -4px;
  background: linear-gradient(
    135deg,
    var(--color-accent-light) 0%,
    transparent 50%,
    var(--color-accent-subtle) 100%
  );
  border-radius: 50%;
  z-index: -1;
  opacity: 0;
  transition: opacity var(--duration-normal) var(--ease-out);
}

.hero-avatar:hover {
  transform: scale(1.03) translateY(-2px);
  box-shadow: var(--shadow-xl), 0 0 0 1px var(--color-accent-border);
}

.hero-avatar:hover::before {
  opacity: 1;
}

.hero-avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 50%;
}

/* Name */
.hero-title {
  margin-bottom: 1.25rem;
}

.hero-name {
  display: block;
  font-family: var(--font-heading);
  font-size: clamp(2rem, 6vw, 3.25rem);
  font-weight: var(--font-weight-black);
  letter-spacing: -0.03em;
  line-height: 1.05;
  color: var(--color-fg-bold);
}

/* Tagline */
.hero-tagline {
  font-size: var(--text-xl);
  color: var(--color-fg);
  max-width: 560px;
  margin: 0 auto 2rem;
  line-height: 1.65;
  font-weight: var(--font-weight-normal);
}

.hero-tagline br {
  display: block;
  margin-top: 0.5rem;
}

.hero-highlight {
  color: var(--color-accent);
  font-weight: var(--font-weight-semibold);
  text-decoration: none;
  background-image: linear-gradient(
    transparent calc(100% - 2px),
    var(--color-accent-underline) 2px
  );
  background-size: 100% 100%;
  transition: background-size var(--duration-fast) var(--ease-out),
    color var(--duration-fast) var(--ease-out);
}

.hero-highlight:hover {
  background-image: linear-gradient(
    transparent calc(100% - 2px),
    var(--color-accent) 2px
  );
}

/* Credential chips */
.hero-chips {
  display: flex;
  gap: 0.625rem;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 2.25rem;
}

.hero-chip {
  font-size: var(--text-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-fg);
  padding: 0.5rem 1rem;
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  transition: background var(--duration-fast) var(--ease-out),
    border-color var(--duration-fast) var(--ease-out),
    transform var(--duration-fast) var(--ease-out);
}

.hero-chip:hover {
  background: var(--color-accent-subtle);
  border-color: var(--color-accent-border);
  transform: translateY(-1px);
}

/* CTA buttons */
.hero-cta {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

/* Background */
.hero-bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.hero-gradient {
  position: absolute;
  top: 35%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 1200px;
  height: 800px;
  background: radial-gradient(
    ellipse 100% 100% at 50% 50%,
    var(--color-accent-light) 0%,
    var(--color-accent-subtle) 15%,
    rgba(46, 89, 186, 0.03) 30%,
    transparent 45%
  );
  filter: blur(100px);
  opacity: 0.6;
}

/* Mobile */
@media (max-width: 640px) {
  .hero {
    padding: 4rem 1.5rem 3.5rem;
    padding-top: calc(var(--header-height) + 4rem);
  }

  .hero-avatar {
    width: 140px;
    height: 140px;
    margin-bottom: 2rem;
  }

  .hero-tagline {
    font-size: var(--text-lg);
  }

  .hero-chips {
    gap: 0.5rem;
  }

  .hero-chip {
    font-size: var(--text-xs);
    padding: 0.4rem 0.875rem;
  }
}

/* ========================================
   BUTTONS
   ======================================== */

.button {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  font-size: var(--text-base);
  font-weight: var(--font-weight-medium);
  text-decoration: none;
  border-radius: var(--radius-md);
  transition: all var(--duration-fast) var(--ease-out);
  border: 1px solid transparent;
  cursor: pointer;
}

.button-primary {
  background-color: var(--color-accent);
  color: white;
  border-color: var(--color-accent);
}

.button-primary:hover {
  background-color: #2347a0;
  border-color: #2347a0;
  color: white;
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.button-secondary {
  background-color: transparent;
  color: var(--color-fg-bold);
  border-color: var(--color-border);
}

.button-secondary:hover {
  background-color: var(--color-bg-alt);
  border-color: var(--color-accent);
  color: var(--color-fg-bold);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

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

/* ========================================
   CONTENT PAGES
   ======================================== */

.page-section {
  padding: calc(var(--header-height) + 2rem) 2rem var(--space-3xl);
}

.content {
  max-width: 800px;
  margin: 0 auto;
}

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

.mb-xl {
  margin-bottom: var(--space-xl);
}

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

/* Cards */
.card {
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  padding: var(--space-lg);
  transition: all var(--duration-normal) var(--ease-out);
}

.card:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--color-accent);
  transform: translateY(-2px);
}

.card__title {
  color: var(--color-fg-bold);
  margin-bottom: var(--space-sm);
  font-size: var(--text-lg);
}

.card__description {
  color: var(--color-fg-light);
  margin-bottom: 0;
  line-height: var(--leading-normal);
}

/* ========================================
   RESUME PAGE
   ======================================== */

.resume-page {
  max-width: 880px;
  margin: 0 auto;
  padding: calc(var(--header-height) + 2rem) 2rem 4rem;
}

.resume-header {
  text-align: center;
  margin-bottom: 2rem;
}

.resume-title {
  font-size: var(--text-3xl);
  font-weight: var(--font-weight-black);
  letter-spacing: var(--tracking-tight);
  margin-bottom: 1.25rem;
  color: var(--color-fg-bold);
}

.resume-summary {
  font-size: var(--text-lg);
  line-height: 1.7;
  color: var(--color-fg);
  max-width: 640px;
  margin: 0 auto;
}

.resume-nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.5rem;
  margin-top: 2rem;
  margin-bottom: 2rem;
  position: sticky;
  top: var(--header-height);
  z-index: 100;
  background: rgba(245, 245, 247, 0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  padding: 1rem 1.5rem;
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border-bg);
  box-shadow: var(--shadow-sm);
}

.resume-nav-link {
  padding: 0.5rem 1rem;
  font-size: var(--text-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-fg-light);
  background: transparent;
  border: none;
  border-radius: var(--radius-sm);
  text-decoration: none;
  transition: all var(--duration-fast) var(--ease-out);
}

.resume-nav-link:hover {
  color: var(--color-fg);
  background: var(--color-bg);
}

.resume-nav-link.active {
  color: var(--color-accent);
  background: var(--color-accent-subtle);
  font-weight: var(--font-weight-bold);
}

.resume-content {
  display: flex;
  flex-direction: column;
  gap: 4.5rem;
}

.resume-section {
  scroll-margin-top: calc(var(--header-height) + 8rem);
  padding-top: 2.5rem;
  border-top: 2px solid var(--color-border);
}

.resume-section:first-child {
  border-top: none;
  padding-top: 0;
}

.section-title-wrapper {
  text-align: center;
  margin-bottom: 2.5rem;
}

.section-title-wrapper h2 {
  font-size: var(--text-2xl);
  font-weight: var(--font-weight-black);
  letter-spacing: var(--tracking-tight);
  color: var(--color-fg-bold);
  display: inline-block;
  padding-bottom: 0.75rem;
  border-bottom: 3px solid var(--color-accent);
  margin: 0;
}

/* ========================================
   FOOTER
   ======================================== */

.footer {
  padding: var(--space-xl) 2rem;
  text-align: center;
  border-top: 1px solid var(--color-border);
  background-color: var(--color-bg-alt);
}

.footer__text {
  color: var(--color-fg-light);
  font-size: var(--text-sm);
  margin: 0;
}

/* ========================================
   ACCESSIBILITY
   ======================================== */

/* 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;
  }
}

/* Skip Navigation Link */
.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--color-accent);
  color: white;
  padding: 0.5rem 1rem;
  text-decoration: none;
  z-index: 10000;
  font-weight: var(--font-weight-bold);
}

.skip-link:focus {
  top: 0;
}