/* ============================================
   MODERN DESIGN SYSTEM - Patrick Lambe Portfolio
   ============================================ */

/* Import Modern Font */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

/* CSS Variables - Design Tokens */
:root {
  /* Colors */
  --color-bg-primary: #0a0e27;
  --color-bg-secondary: #151b3d;
  --color-bg-tertiary: #1e2749;
  --color-text-primary: #ffffff;
  --color-text-secondary: #a8b2d1;
  --color-text-muted: #6b7a99;
  --color-accent-primary: #64ffda;
  --color-accent-secondary: #5a67d8;
  --color-accent-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --color-border: rgba(255, 255, 255, 0.1);

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

  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 2rem;
  --font-size-4xl: 2.5rem;
  --font-size-5xl: 3rem;

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.3);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.4);
  --shadow-glow: 0 0 20px rgba(100, 255, 218, 0.3);

  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 350ms ease;

  /* Layout */
  --max-width: 1200px;
  --header-height: 80px;
}

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

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

body {
  background: var(--color-bg-primary);
  background-image:
    radial-gradient(at 0% 0%, rgba(102, 126, 234, 0.1) 0px, transparent 50%),
    radial-gradient(at 100% 100%, rgba(118, 75, 162, 0.1) 0px, transparent 50%);
  font-family: var(--font-family);
  color: var(--color-text-primary);
  line-height: 1.6;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ============================================
   TYPOGRAPHY
   ============================================ */

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

h1 {
  font-size: var(--font-size-5xl);
  font-weight: 700;
  background: linear-gradient(135deg, var(--color-text-primary) 0%, var(--color-accent-primary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

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

h3 {
  font-size: var(--font-size-2xl);
  color: var(--color-accent-primary);
}

p {
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-md);
}

a {
  color: var(--color-accent-primary);
  text-decoration: none;
  transition: all var(--transition-base);
  position: relative;
}

a:hover {
  color: var(--color-text-primary);
  transform: translateY(-2px);
}

/* ============================================
   LAYOUT CONTAINERS
   ============================================ */

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

.section {
  padding: 20px 0;
}

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

header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(10, 14, 39, 0.8);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
  height: var(--header-height);
}

header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 100%;
}

.logo {
  font-size: var(--font-size-xl);
  font-weight: 700;
  background: var(--color-accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

header nav ul {
  display: flex;
  gap: var(--spacing-lg);
  list-style: none;
  margin: 0;
  padding: 0;
}

header nav a {
  color: var(--color-text-secondary);
  font-weight: 500;
  font-size: var(--font-size-sm);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-sm);
  transition: all var(--transition-base);
}

header nav a:hover {
  color: var(--color-accent-primary);
  background: rgba(100, 255, 218, 0.1);
  transform: translateY(0);
}

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

.hero {
  padding: var(--spacing-3xl) 0;
  text-align: center;
}

.hero h1 {
  font-size: clamp(2.5rem, 8vw, 4rem);
  margin-bottom: var(--spacing-md);
}

.hero .subtitle {
  font-size: var(--font-size-xl);
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-lg);
  font-weight: 300;
}

.hero .description {
  font-size: var(--font-size-lg);
  color: var(--color-text-muted);
  max-width: 600px;
  margin: 0 auto var(--spacing-xl);
}

/* ============================================
   PROJECT CARDS
   ============================================ */

.flex-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-xl);
  margin-top: var(--spacing-xl);
  align-items: start;
  /* CRITICAL: Prevents row stretching */
}

.project-card {
  background: var(--color-bg-secondary);
  border-radius: var(--radius-xl);
  overflow: hidden;
  border: 1px solid var(--color-border);
  transition: all var(--transition-base);
  position: relative;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  min-height: 320px;
  /* Ensures uniformity */
  height: fit-content;
  /* Allows individual expansion */
}

.project-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--color-accent-gradient);
  opacity: 0;
  transition: opacity var(--transition-base);
  z-index: 1;
}

.project-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-xl), var(--shadow-glow);
  border-color: var(--color-accent-primary);
  /* This might be causing clipping if border-radius isn't perfect */
}

.project-card.expanded {
  transform: translateY(-8px);
  box-shadow: var(--shadow-xl), var(--shadow-glow);
  border-color: var(--color-accent-primary);
  z-index: 10;
}

.project-card:hover::before,
.project-card.expanded::before {
  opacity: 1;
}

.project-card img {
  width: 100%;
  height: 250px;
  object-fit: cover;
  border: none;
  padding: 0;
  transition: transform var(--transition-slow);
}

.project-card:hover img {
  transform: scale(1.05);
}

.project-card .image-title {
  padding: var(--spacing-lg);
  text-align: center;
  font-weight: 500;
  color: var(--color-text-primary);
  font-size: var(--font-size-lg);
  background: var(--color-bg-secondary);
  position: relative;
  z-index: 2;
}

.card-details {
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  transition: all var(--transition-slow);
  background: var(--color-bg-secondary);
  padding: 0 var(--spacing-lg);
}

.project-card.expanded .card-details {
  max-height: 300px;
  /* Arbitrary large height to allow expansion */
  opacity: 1;
  padding-bottom: var(--spacing-lg);
}

.card-details p {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-md);
}

.more-link {
  display: inline-block;
  padding: var(--spacing-xs) var(--spacing-md);
  background: var(--color-accent-gradient);
  color: white;
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  font-weight: 500;
  transition: opacity var(--transition-fast);
}

.more-link:hover {
  opacity: 0.9;
  transform: translateY(-1px);
  color: white;
}

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

.footer {
  border-top: 1px solid var(--color-border);
  padding: var(--spacing-2xl) 0;
  text-align: center;
  background: var(--color-bg-secondary);
}

.footer nav ul {
  display: flex;
  justify-content: center;
  gap: var(--spacing-xl);
  list-style: none;
}

.footer nav a {
  color: var(--color-text-secondary);
  font-size: var(--font-size-base);
  font-weight: 500;
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  transition: all var(--transition-base);
  display: inline-block;
}

.footer nav a:hover {
  color: var(--color-accent-primary);
  border-color: var(--color-accent-primary);
  box-shadow: 0 0 15px rgba(100, 255, 218, 0.2);
  transform: translateY(-3px);
}

/* ============================================
   RESPONSIVE DESIGN
   ============================================ */

@media screen and (max-width: 768px) {
  :root {
    --spacing-3xl: 3rem;
    --spacing-2xl: 2rem;
  }

  header .container {
    flex-direction: column;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-lg);
  }

  header {
    height: auto;
  }

  header nav ul {
    gap: var(--spacing-sm);
  }

  .flex-container {
    grid-template-columns: 1fr;
  }

  .footer nav ul {
    flex-direction: column;
    gap: var(--spacing-md);
  }
}

/* ============================================
   UTILITY CLASSES
   ============================================ */

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

.mb-4 {
  margin-bottom: var(--spacing-xl);
}

/* ============================================
   CERTIFICATE DECODER SPECIFIC
   ============================================ */

.cert-hero {
  text-align: center;
  padding: var(--spacing-xl) 0 var(--spacing-lg);
}

.page-hero {
  text-align: center;
  padding: var(--spacing-xl) 0 var(--spacing-lg);
}

.container.slim {
  max-width: 720px;
}

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  margin-bottom: var(--spacing-xs);
}

.hero-subtitle {
  color: var(--color-text-secondary);
  max-width: 640px;
  margin: 0 auto;
  font-size: var(--font-size-lg);
}

.hero-description {
  color: var(--color-text-muted);
  max-width: 640px;
  margin: var(--spacing-md) auto 0;
  font-size: var(--font-size-base);
}

.cert-layout {
  padding: var(--spacing-lg) 0 var(--spacing-xl);
}

.cert-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(360px, 1fr));
  gap: var(--spacing-lg);
  align-items: stretch;
}

.cert-card {
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--spacing-lg);
  box-shadow: var(--shadow-md);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.cert-card-header h2 {
  margin-bottom: var(--spacing-xs);
}

.helper-text {
  color: var(--color-text-muted);
  margin: 0;
  font-size: var(--font-size-sm);
}

.cert-textarea {
  width: 100%;
  min-height: 280px;
  background: var(--color-bg-tertiary);
  color: var(--color-text-primary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--spacing-md);
  font-family: var(--font-family);
  font-size: var(--font-size-sm);
  line-height: 1.4;
  resize: vertical;
  outline: none;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.cert-textarea:focus {
  border-color: var(--color-accent-primary);
  box-shadow: 0 0 0 3px rgba(100, 255, 218, 0.18);
}

.cert-output {
  flex: 1;
  min-height: 280px;
  background: var(--color-bg-tertiary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--spacing-md);
  color: var(--color-text-primary);
  line-height: 1.6;
  word-break: break-word;
}

.placeholder {
  color: var(--color-text-muted);
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ============================================
   CHAT PAGE
   ============================================ */

.chat-hero {
  text-align: center;
  padding: var(--spacing-xl) 0 var(--spacing-lg);
}

.chat-layout {
  padding: var(--spacing-lg) 0 var(--spacing-xl);
}

.chat-card {
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--spacing-xl);
  box-shadow: var(--shadow-md);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
}

.chat-card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: var(--spacing-md);
}

.chat-card-header h2 {
  margin-bottom: var(--spacing-xs);
}

.chat-pill {
  padding: 0.4rem 0.75rem;
  border-radius: 999px;
  background: rgba(100, 255, 218, 0.12);
  color: var(--color-accent-primary);
  font-size: var(--font-size-xs);
  border: 1px solid rgba(100, 255, 218, 0.35);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.chat-meta-list {
  list-style: none;
  display: grid;
  gap: var(--spacing-sm);
  margin: 0;
  padding: 0;
  color: var(--color-text-secondary);
}

.chat-meta-list li {
  display: flex;
  gap: var(--spacing-sm);
  align-items: center;
  font-size: var(--font-size-sm);
}

.chat-meta-list .dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-accent-primary);
  flex-shrink: 0;
}

.btn-gradient {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white !important;
  border: none;
}

.btn-gradient:hover {
  opacity: 0.92;
  color: white !important;
}