/* =============================================
   DESIGN TOKENS — DARK (default / :root fallback)
   ============================================= */
[data-theme="dark"],
:root {
  --color-bg:             #171e26;
  --color-surface:        #10161d;
  --color-surface-alt:    #1e2731;
  --color-border:         #243447;
  --color-text-primary:   #E8EDF2;
  --color-text-secondary: #8FA3B1;
  --color-text-muted:     #566B7A;
  --color-accent:         #4EAECF;
  --color-accent-hover:   #3B9AB8;
  --color-quote-bar:      #4A9B2A;
  --color-link:           #E8EDF2;
  --color-link-hover:     #4EAECF;
  --color-toggle-bg:      #243447;
  --color-toggle-fg:      #8FA3B1;
  --color-toggle-hover-bg: #2E4259;
  --color-toggle-hover-fg: #E8EDF2;
}

/* =============================================
   DESIGN TOKENS — LIGHT
   ============================================= */
[data-theme="light"] {
  --color-bg:             #F5F7FA;
  --color-surface:        #FFFFFF;
  --color-surface-alt:    #EEF1F5;
  --color-border:         #D0D9E2;
  --color-text-primary:   #1A2733;
  --color-text-secondary: #4A6070;
  --color-text-muted:     #8FA3B1;
  --color-accent:         #1A7FA0;
  --color-accent-hover:   #155E78;
  --color-quote-bar:      #3A8520;
  --color-link:           #1A2733;
  --color-link-hover:     #1A7FA0;
  --color-toggle-bg:      #E0E8F0;
  --color-toggle-fg:      #4A6070;
  --color-toggle-hover-bg: #C8D8E8;
  --color-toggle-hover-fg: #1A2733;
}

/* =============================================
   LAYOUT & TYPOGRAPHY VARIABLES
   ============================================= */
:root {
  --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
  --font-mono: 'Fira Code', 'Cascadia Code', monospace;

  --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:  1.875rem;

  --weight-normal:   400;
  --weight-medium:   500;
  --weight-semibold: 600;

  --leading-tight:   1.25;
  --leading-normal:  1.6;
  --leading-relaxed: 1.75;

  --space-1:  0.25rem;
  --space-2:  0.5rem;
  --space-3:  0.75rem;
  --space-4:  1rem;
  --space-5:  1.25rem;
  --space-6:  1.5rem;
  --space-8:  2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;

  --max-width: 740px;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-full: 9999px;

  --transition-fast: 150ms ease;
  --transition-base: 200ms ease;
}

/* =============================================
   RESET + BASE
   ============================================= */
*, *::before, *::after {
  box-sizing: border-box;
}

html {
  display: flex;
  justify-content: center;
  margin: auto;
  max-width: 100%;
  background-color: var(--color-bg);
  color: var(--color-text-primary);
  padding: 0;
  border: 0;
}

body {
  padding: var(--space-4) var(--space-4);
  margin: var(--space-8) auto;
  font-size: var(--text-base);
  font-family: var(--font-sans);
  font-weight: var(--weight-normal);
  line-height: var(--leading-normal);
  max-width: var(--max-width);
  width: 100%;
}

/* =============================================
   HEADINGS
   ============================================= */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-sans);
  font-weight: var(--weight-semibold);
  line-height: var(--leading-tight);
  color: var(--color-text-primary);
}

h1 {
  font-size: var(--text-2xl);
  margin: 0;
  padding: 0;
  border: 0;
  text-align: center;
  letter-spacing: -0.015em;
}

h2 {
  font-size: var(--text-xl);
  border: 0;
  padding: 0;
  margin-top: var(--space-8);
  margin-bottom: var(--space-4);
}

h3 {
  font-size: var(--text-lg);
  margin-top: var(--space-6);
  margin-bottom: var(--space-3);
}

/* =============================================
   LINKS
   ============================================= */
a, a:active {
  color: var(--color-accent);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

/* =============================================
   HEADER
   ============================================= */
header {
  text-align: center;
  padding-bottom: var(--space-8);
  border-bottom: 1px solid var(--color-border);
  margin-bottom: var(--space-8);
  position: relative;
}

.pfp {
  display: block;
  margin-left: auto;
  margin-right: auto;
  border-radius: var(--radius-full);
  width: 120px;
  height: 120px;
  margin-bottom: var(--space-4);
  border: 2px solid var(--color-border);
}

.header-tagline {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  font-weight: var(--weight-medium);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin: var(--space-2) 0 var(--space-6);
}

header ul {
  display: flex;
  flex-direction: row;
  justify-content: center;
  align-items: center;
  gap: var(--space-1);
  list-style: none;
  padding: 0;
  margin: 0;
}

header li {
  display: flex;
  justify-content: center;
  align-items: center;
  font-size: 18px;
  border: 0;
  margin: 0;
  padding: 0;
}

header li a {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  font-size: var(--text-xs);
  font-weight: var(--weight-medium);
  color: var(--color-text-secondary);
  transition: color var(--transition-fast), background-color var(--transition-fast);
  gap: var(--space-1);
}

header li a i {
  font-size: var(--text-lg);
}

header li a:hover {
  color: var(--color-accent);
  background-color: var(--color-surface);
}

/* =============================================
   HOME BUTTON
   ============================================= */
.home-btn {
  position: absolute;
  top: 0;
  left: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  background-color: var(--color-toggle-bg);
  color: var(--color-toggle-fg);
  font-size: 14px;
  transition: background-color var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast);
}

.home-btn:hover {
  background-color: var(--color-toggle-hover-bg);
  color: var(--color-toggle-hover-fg);
  border-color: var(--color-accent);
}

/* =============================================
   THEME TOGGLE
   ============================================= */
.theme-toggle {
  position: absolute;
  top: 0;
  right: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  background-color: var(--color-toggle-bg);
  color: var(--color-toggle-fg);
  cursor: pointer;
  font-size: 14px;
  -webkit-appearance: none;
  appearance: none;
  line-height: 1;
  transition: background-color var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast);
}

.theme-toggle:hover {
  background-color: var(--color-toggle-hover-bg);
  color: var(--color-toggle-hover-fg);
  border-color: var(--color-accent);
}

.theme-toggle .icon-moon { display: inline-block; }
.theme-toggle .icon-sun  { display: none; }
[data-theme="light"] .theme-toggle .icon-moon { display: none; }
[data-theme="light"] .theme-toggle .icon-sun  { display: inline-block; }

/* =============================================
   THEME TRANSITION (only fires on user click)
   ============================================= */
.theme-transitions-enabled,
.theme-transitions-enabled * {
  transition-property: color, background-color, border-color;
  transition-duration: var(--transition-base);
  transition-timing-function: ease;
}

/* =============================================
   HOMEPAGE SECTIONS
   ============================================= */
.section-bio {
  margin-bottom: var(--space-10);
}

.section-bio p {
  line-height: var(--leading-relaxed);
  color: var(--color-text-primary);
  margin-bottom: var(--space-4);
}

.section-heading {
  font-size: var(--text-xs);
  font-weight: var(--weight-semibold);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-top: 0;
  margin-bottom: var(--space-4);
  padding-bottom: var(--space-2);
  border-bottom: 1px solid var(--color-border);
}

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

.skills-grid {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.skill-tag {
  display: inline-flex;
  align-items: center;
  padding: var(--space-1) var(--space-3);
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  color: var(--color-text-secondary);
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  line-height: 1.5;
  transition: color var(--transition-fast), border-color var(--transition-fast), background-color var(--transition-fast);
}

.skill-tag:hover {
  color: var(--color-accent);
  border-color: var(--color-accent);
  background-color: var(--color-surface-alt);
}

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

.view-all-posts {
  margin-top: var(--space-4);
  font-size: var(--text-sm);
}

.view-all-posts a {
  color: var(--color-accent);
}

.view-all-posts a:hover {
  color: var(--color-accent-hover);
}

/* =============================================
   BLOG INDEX
   ============================================= */
.blog-list {
  margin-top: var(--space-4);
}

.post-preview {
  padding: var(--space-5) 0;
  border-bottom: 1px solid var(--color-border);
}


.post-date {
  font-size: var(--text-xs);
  font-weight: var(--weight-medium);
  letter-spacing: 0.06em;
  color: var(--color-text-muted);
  text-transform: uppercase;
  display: block;
  margin-bottom: var(--space-1);
}

.post-preview a {
  font-size: var(--text-base);
  font-weight: var(--weight-medium);
  color: var(--color-text-primary);
  display: block;
  margin-bottom: var(--space-1);
}

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

.post-description {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  margin-top: 0;
  line-height: var(--leading-normal);
}

/* =============================================
   BLOG POST
   ============================================= */
.post-header {
  margin-bottom: var(--space-8);
  padding-bottom: var(--space-6);
  border-bottom: 1px solid var(--color-border);
}

.post-header h1 {
  text-align: left;
  font-size: var(--text-2xl);
  letter-spacing: -0.02em;
  margin-bottom: var(--space-2);
}

.post-content {
  line-height: var(--leading-relaxed);
}

.post-content img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  margin: var(--space-6) 0;
  display: block;
}

.post-content h2,
.post-content h3 {
  margin-top: var(--space-8);
  margin-bottom: var(--space-3);
}

.post-content p {
  margin-bottom: var(--space-5);
}

.post-content code {
  background-color: var(--color-surface-alt);
  color: var(--color-accent);
  padding: 0.1em 0.35em;
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 0.875em;
}

.post-content pre {
  background-color: var(--color-surface-alt);
  border: 1px solid var(--color-border);
  padding: var(--space-5);
  border-radius: var(--radius-md);
  overflow-x: auto;
  margin-bottom: var(--space-6);
}

.post-content pre code {
  background: none;
  color: var(--color-text-primary);
  padding: 0;
  font-size: var(--text-sm);
}

.post-content blockquote {
  border-left: 3px solid var(--color-quote-bar);
  margin-left: 0;
  margin-right: 0;
  padding: var(--space-3) var(--space-5);
  background-color: var(--color-surface);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-5);
}

.post-nav {
  margin-top: var(--space-10);
  padding-top: var(--space-5);
  border-top: 1px solid var(--color-border);
  font-size: var(--text-sm);
}

.post-nav a {
  color: var(--color-text-secondary);
}

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

/* =============================================
   PGP KEY PAGE
   ============================================= */
.gpg {
  display: block;
  background-color: var(--color-surface-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  max-width: 100%;
  word-wrap: break-word;
  word-break: break-all;
  padding: var(--space-5);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  line-height: var(--leading-relaxed);
  color: var(--color-text-secondary);
  overflow-x: auto;
  margin-top: var(--space-4);
}

.download {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  color: var(--color-text-secondary);
  transition: color var(--transition-fast), border-color var(--transition-fast);
  -webkit-user-select: none;
  -ms-user-select: none;
  user-select: none;
}

.download:hover {
  color: var(--color-accent);
  border-color: var(--color-accent);
}

/* =============================================
   FOOTER
   ============================================= */
footer {
  margin-top: var(--space-8);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: var(--text-base);
  color: var(--color-text-muted);
}

footer a {
  color: var(--color-text-muted);
}

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

/* =============================================
   RESPONSIVE
   ============================================= */
@media (max-width: 600px) {
  body {
    padding: var(--space-4) var(--space-3);
    margin-top: var(--space-5);
  }

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

  .pfp {
    width: 96px;
    height: 96px;
  }

  .theme-toggle,
  .home-btn {
    width: 32px;
    height: 32px;
    font-size: 12px;
  }

}