/* ===========================================
   Portfolio Site Styles
   =========================================== */

/* CSS Variables - Dark Theme (default) */
:root,
[data-theme="dark"] {
  /* Colors */
  --color-bg: #0a0a0a;
  --color-bg-secondary: #1a1a1a;
  --color-text: #e0e0e0;
  --color-text-muted: #888;
  --color-primary: #3b82f6;
  --color-primary-hover: #2563eb;
  --color-border: #333;
  --color-card-bg: #141414;
}

/* Light Theme */
[data-theme="light"] {
  --color-bg: #f8f9fa;
  --color-bg-secondary: #ffffff;
  --color-text: #1a1a1a;
  --color-text-muted: #666;
  --color-primary: #2563eb;
  --color-primary-hover: #1d4ed8;
  --color-border: #e0e0e0;
  --color-card-bg: #ffffff;
}

/* Theme toggle icon visibility */
[data-theme="dark"] .icon-sun { display: inline; }
[data-theme="dark"] .icon-moon { display: none; }
[data-theme="light"] .icon-sun { display: none; }
[data-theme="light"] .icon-moon { display: inline; }
:root .icon-sun { display: inline; }
:root .icon-moon { display: none; }

:root {
  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-2xl: 4rem;

  /* Typography */
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
  --font-mono: 'SF Mono', Monaco, 'Cascadia Code', monospace;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.25rem;
  --font-size-xl: 1.5rem;
  --font-size-2xl: 2rem;
  --font-size-3xl: 2.5rem;

  /* Layout */
  --max-width: 1200px;
  --border-radius: 8px;
  --transition: 200ms ease;
}

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

html {
  scroll-behavior: smooth;
}

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

/* Base Typography */
h1, h2, h3, h4, h5, h6 {
  line-height: 1.2;
  font-weight: 600;
  margin-bottom: var(--spacing-md);
}

h1 { font-size: var(--font-size-3xl); }
h2 { font-size: var(--font-size-2xl); }
h3 { font-size: var(--font-size-xl); }

p {
  margin-bottom: var(--spacing-sm);
}

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

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

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

/* Layout */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.section {
  padding: var(--spacing-2xl) 0;
}

/* Header & Navigation */
.site-header {
  position: sticky;
  top: 0;
  background-color: var(--color-bg);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
  z-index: 100;
}

[data-theme="dark"] .site-header {
  background-color: rgba(10, 10, 10, 0.95);
}

[data-theme="light"] .site-header {
  background-color: rgba(248, 249, 250, 0.95);
}

.nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-sm) var(--spacing-md);
  max-width: var(--max-width);
  margin: 0 auto;
}

.nav-logo {
  font-size: var(--font-size-lg);
  font-weight: 700;
  color: var(--color-text);
}

.nav-logo:hover {
  color: var(--color-primary);
}

.nav-links {
  display: flex;
  list-style: none;
  gap: var(--spacing-lg);
}

.nav-links a {
  color: var(--color-text-muted);
  font-weight: 500;
  transition: color var(--transition);
}

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

/* Nav Controls */
.nav-controls {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.control-btn {
  background: none;
  border: 1px solid var(--color-border);
  border-radius: 4px;
  padding: 0.25rem 0.5rem;
  cursor: pointer;
  font-size: 1rem;
  line-height: 1;
  transition: border-color var(--transition);
}

.control-btn:hover {
  border-color: var(--color-primary);
}

.control-select {
  background-color: var(--color-bg);
  color: var(--color-text-muted);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  padding: 0.25rem 0.5rem;
  font-size: 0.75rem;
  font-weight: 500;
  cursor: pointer;
  transition: border-color var(--transition);
}

.control-select:hover {
  border-color: var(--color-primary);
}

.control-select:focus {
  outline: none;
  border-color: var(--color-primary);
}

/* Projects Section */
.projects-section {
  min-height: 60vh;
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: var(--spacing-sm);
}

/* Project Cards - Compact */
.project-card {
  background-color: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  overflow: hidden;
  transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
}

[data-theme="light"] .project-card {
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

[data-theme="light"] .project-card:hover {
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.project-card:hover {
  transform: translateY(-2px);
  border-color: var(--color-primary);
}

.project-content {
  padding: var(--spacing-sm);
}

.project-title {
  font-size: var(--font-size-base);
  margin-bottom: 0.25rem;
  color: var(--color-text);
}

.project-description {
  color: var(--color-text-muted);
  font-size: 0.8rem;
  margin-bottom: var(--spacing-xs);
  line-height: 1.4;
}

/* Project Tags - Compact */
.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem;
  margin-bottom: var(--spacing-xs);
}

.tag {
  display: inline-block;
  padding: 0.125rem 0.375rem;
  background-color: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: 3px;
  font-size: 0.7rem;
  color: var(--color-text-muted);
  font-family: var(--font-mono);
}

/* Project Links - Compact */
.project-links {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.project-link {
  display: inline-block;
  padding: 0.25rem 0.5rem;
  font-size: 0.75rem;
  font-weight: 500;
  border-radius: 3px;
  border: 1px solid var(--color-border);
  color: var(--color-text-muted);
  transition: all var(--transition);
}

.project-link:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.project-link--primary {
  background-color: var(--color-primary);
  border-color: var(--color-primary);
  color: #fff;
}

.project-link--primary:hover {
  background-color: var(--color-primary-hover);
  border-color: var(--color-primary-hover);
  color: #fff;
}

/* Empty and Error States */
.empty-state,
.error-state {
  text-align: center;
  padding: var(--spacing-2xl);
  color: var(--color-text-muted);
}

.error-state {
  color: #ef4444;
}

/* About Section */
.about-section {
  background-color: var(--color-bg-secondary);
}

.about-content {
  max-width: 800px;
}

.profile {
  display: flex;
  gap: var(--spacing-xl);
  align-items: flex-start;
}

.profile-image {
  flex-shrink: 0;
  width: 150px;
  height: 150px;
  border-radius: 50%;
  overflow: hidden;
  border: 3px solid var(--color-border);
}

.profile-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.profile-info {
  flex: 1;
}

.profile-name {
  font-size: var(--font-size-xl);
  margin-bottom: var(--spacing-xs);
  color: var(--color-text);
}

.profile-headline {
  font-size: var(--font-size-lg);
  color: var(--color-primary);
  margin-bottom: var(--spacing-sm);
  font-weight: 500;
}

.profile-bio {
  color: var(--color-text-muted);
  line-height: 1.7;
  margin-bottom: var(--spacing-md);
}

/* Social Links */
.social-links {
  display: flex;
  gap: var(--spacing-sm);
  flex-wrap: wrap;
}

.social-link {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: 0.5rem 1rem;
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
  font-weight: 500;
  transition: all var(--transition);
}

.social-link:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

/* Loading State */
.loading-state {
  color: var(--color-text-muted);
  font-style: italic;
}

/* Modal (US3) */
.modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 1000;
}

.modal--open {
  display: flex;
  align-items: center;
  justify-content: center;
}

.modal-backdrop {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.8);
  backdrop-filter: blur(4px);
}

.modal-content {
  position: relative;
  background-color: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  padding: var(--spacing-xl);
  max-width: 600px;
  width: 90%;
  max-height: 80vh;
  overflow-y: auto;
  z-index: 1;
  animation: modalSlideIn 0.2s ease;
}

@keyframes modalSlideIn {
  from {
    opacity: 0;
    transform: translateY(-20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.modal-close {
  position: absolute;
  top: var(--spacing-sm);
  right: var(--spacing-sm);
  background: none;
  border: none;
  font-size: var(--font-size-2xl);
  color: var(--color-text-muted);
  cursor: pointer;
  padding: 0.5rem;
  line-height: 1;
  transition: color var(--transition);
}

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

.modal-title {
  font-size: var(--font-size-xl);
  margin-bottom: var(--spacing-md);
  padding-right: var(--spacing-xl);
}

.modal-description {
  color: var(--color-text-muted);
  line-height: 1.7;
  margin-bottom: var(--spacing-md);
}

.modal-tags {
  margin-bottom: var(--spacing-md);
}

.modal-links {
  display: flex;
  gap: var(--spacing-sm);
  flex-wrap: wrap;
}

/* Make project cards clickable */
.project-card {
  cursor: pointer;
}

/* Footer */
.site-footer {
  padding: var(--spacing-lg) 0;
  text-align: center;
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
  border-top: 1px solid var(--color-border);
}

/* Responsive Styles */
@media (max-width: 768px) {
  :root {
    --font-size-3xl: 2rem;
    --font-size-2xl: 1.5rem;
  }

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

  .profile {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }

  .profile-image {
    width: 120px;
    height: 120px;
  }

  .social-links {
    justify-content: center;
  }
}

@media (max-width: 480px) {
  .nav {
    flex-direction: column;
    gap: var(--spacing-sm);
  }

  .nav-links {
    gap: var(--spacing-md);
  }

  .projects-grid {
    grid-template-columns: 1fr;
  }

  .profile-image {
    width: 100px;
    height: 100px;
  }
}