/* ==========================================================================
   Design System: Dark Liquid Glass
   Inspired by Apple iOS 26 Liquid Glass
   ========================================================================== */

/* --- Google Fonts --- */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600&display=swap');

/* --- Design Tokens --- */
:root {
  /* Backgrounds */
  --bg-deep: #0a0a0f;
  --bg-surface: #12121a;
  --bg-gradient: linear-gradient(135deg, #0a0a0f 0%, #141428 50%, #0d1117 100%);

  /* Glass */
  --glass-bg: rgba(255, 255, 255, 0.06);
  --glass-bg-hover: rgba(255, 255, 255, 0.10);
  --glass-border: rgba(255, 255, 255, 0.12);
  --glass-highlight: rgba(255, 255, 255, 0.15);

  /* Text */
  --text-primary: rgba(255, 255, 255, 0.92);
  --text-secondary: rgba(255, 255, 255, 0.55);
  --text-tertiary: rgba(255, 255, 255, 0.30);

  /* Accent */
  --accent: #6eb1ff;
  --accent-glow: rgba(110, 177, 255, 0.15);
  --accent-surface: rgba(110, 177, 255, 0.08);
  --accent-border: rgba(110, 177, 255, 0.2);

  /* Status */
  --danger: #ff6b6b;
  --success: #6bffa1;

  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  --font-mono: 'SF Mono', 'Fira Code', 'Cascadia Code', monospace;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.25rem;
  --font-size-xl: 1.75rem;
  --font-size-hero: 2.5rem;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;

  /* Radius */
  --radius-sm: 0.5rem;
  --radius-md: 1rem;
  --radius-lg: 1.5rem;
  --radius-full: 9999px;

  /* Animation */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
  --duration-fast: 150ms;
  --duration-normal: 300ms;
  --duration-slow: 500ms;
  --duration-stream: 120ms;
}

/* ==========================================================================
   Reset & Base
   ========================================================================== */

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

html {
  height: 100%;
  background-color: #0a0a0f;
}

body {
  height: 100%;
  overflow: hidden;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-normal);
  color: var(--text-primary);
  background: var(--bg-gradient);
  background-attachment: fixed;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ==========================================================================
   Glass Surface
   ========================================================================== */

.glass {
  position: relative;
  background: var(--glass-bg);
  backdrop-filter: blur(16px) saturate(180%);
  -webkit-backdrop-filter: blur(16px) saturate(180%);
  border: 1px solid var(--glass-border);
  box-shadow:
    0 8px 32px rgba(0, 0, 0, 0.3),
    inset 0 1px 0 var(--glass-highlight);
}

.glass::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: linear-gradient(
    135deg,
    rgba(255, 255, 255, 0.08) 0%,
    transparent 50%,
    rgba(255, 255, 255, 0.03) 100%
  );
  pointer-events: none;
  z-index: 0;
}

/* ==========================================================================
   Layout
   ========================================================================== */

.app {
  display: flex;
  flex-direction: column;
  height: 100vh;
  height: 100dvh;
  max-width: 900px;
  margin: 0 auto;
}

/* ==========================================================================
   Header / Navigation
   ========================================================================== */

.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-md) var(--space-lg);
  border-radius: 0 0 var(--radius-md) var(--radius-md);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  background: rgba(255, 255, 255, 0.04);
  z-index: 10;
  animation: fadeIn var(--duration-slow) var(--ease-out) forwards;
}

.header__title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

.header__nav {
  display: flex;
  gap: var(--space-md);
  list-style: none;
}

.header__nav a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  transition: color var(--duration-fast) var(--ease-out),
              text-shadow var(--duration-fast) var(--ease-out);
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--radius-sm);
}

.header__nav a:hover {
  color: var(--accent);
  text-shadow: 0 0 12px var(--accent-glow);
}

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

.header__nav a.active {
  color: var(--accent);
}

/* ==========================================================================
   Chat Messages Area
   ========================================================================== */

.messages {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-lg) var(--space-md);
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  scroll-behavior: smooth;
  scrollbar-width: thin;
  scrollbar-color: rgba(255, 255, 255, 0.1) transparent;
}

.messages::-webkit-scrollbar {
  width: 6px;
}

.messages::-webkit-scrollbar-track {
  background: transparent;
}

.messages::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-full);
}

/* ==========================================================================
   Message Bubbles
   ========================================================================== */

.message {
  max-width: 80%;
  padding: var(--space-sm) var(--space-md);
  line-height: 1.4;
  font-size: var(--font-size-base);
  word-wrap: break-word;
  animation: slideUp var(--duration-normal) var(--ease-out) forwards;
  opacity: 0;
}

.message--ai {
  align-self: flex-start;
  border-radius: var(--radius-lg) var(--radius-lg) var(--radius-lg) var(--radius-sm);
  color: var(--text-primary);
}

.message--user {
  align-self: flex-end;
  background: var(--accent-surface);
  border: 1px solid var(--accent-border);
  border-radius: var(--radius-lg) var(--radius-lg) var(--radius-sm) var(--radius-lg);
  color: var(--text-primary);
  backdrop-filter: blur(16px) saturate(180%);
  -webkit-backdrop-filter: blur(16px) saturate(180%);
  box-shadow:
    0 8px 32px rgba(0, 0, 0, 0.2),
    inset 0 1px 0 rgba(110, 177, 255, 0.1);
}

.message--user::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: linear-gradient(
    135deg,
    rgba(110, 177, 255, 0.06) 0%,
    transparent 60%
  );
  pointer-events: none;
}

/* Welcome message - no animation delay */
.message--welcome {
  animation: fadeIn var(--duration-slow) var(--ease-out) forwards;
}

/* ==========================================================================
   Markdown Content in Messages
   ========================================================================== */

.message--ai p {
  margin: 0 0 0.2em 0;
}

.message--ai p:last-child {
  margin-bottom: 0;
}

.message--ai strong {
  font-weight: var(--font-weight-semibold);
  color: var(--text-primary);
}

.message--ai em {
  font-style: italic;
  color: var(--text-secondary);
}

.message--ai h2,
.message--ai h3,
.message--ai h4 {
  font-weight: var(--font-weight-semibold);
  margin: 0.3em 0 0.1em 0;
  letter-spacing: -0.01em;
}

.message--ai h2 { font-size: var(--font-size-lg); }
.message--ai h3 { font-size: var(--font-size-base); }
.message--ai h4 { font-size: var(--font-size-sm); text-transform: uppercase; letter-spacing: 0.04em; color: var(--text-secondary); }

.message--ai ul,
.message--ai ol {
  margin: 0.1em 0;
  padding: 0 0 0 1.2em;
  list-style-position: outside;
}

.message--ai li {
  margin: 0;
  padding: 0;
  line-height: 1.35;
}

.message--ai ul br,
.message--ai ol br {
  display: none;
}

.message--ai code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  background: rgba(255, 255, 255, 0.08);
  padding: 0.15em 0.4em;
  border-radius: 4px;
  color: var(--accent);
}

.message--ai pre {
  margin: var(--space-sm) 0;
  padding: var(--space-md);
  background: rgba(0, 0, 0, 0.3);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-sm);
  overflow-x: auto;
}

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

/* ==========================================================================
   Suggestion Chips
   ========================================================================== */

.suggestions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  padding: 0 var(--space-xs);
  animation: fadeIn var(--duration-slow) var(--ease-out) 0.3s forwards;
  opacity: 0;
}

.suggestion {
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-full);
  font-family: var(--font-family);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--accent);
  cursor: pointer;
  transition: background var(--duration-fast) var(--ease-out),
              transform var(--duration-fast) var(--ease-spring),
              box-shadow var(--duration-fast) var(--ease-out),
              border-color var(--duration-fast) var(--ease-out);
  white-space: nowrap;
}

.suggestion:hover {
  background: var(--glass-bg-hover);
  border-color: var(--accent-border);
  transform: translateY(-2px);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.2),
              0 0 12px var(--accent-glow);
}

.suggestion:active {
  transform: translateY(0) scale(0.97);
}

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

.suggestions--hidden {
  display: none;
}

/* ==========================================================================
   Typing Indicator
   ========================================================================== */

.typing-indicator {
  align-self: flex-start;
  display: flex;
  align-items: center;
  gap: 5px;
  padding: var(--space-md) var(--space-lg);
  border-radius: var(--radius-lg) var(--radius-lg) var(--radius-lg) var(--radius-sm);
  animation: slideUp var(--duration-normal) var(--ease-out) forwards;
  opacity: 0;
  transition: opacity var(--duration-normal) var(--ease-out);
}

.typing-indicator.fade-out {
  opacity: 0 !important;
}

.typing-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--text-secondary);
  animation: pulse 1.4s infinite;
}

.typing-dot:nth-child(2) {
  animation-delay: 0.2s;
}

.typing-dot:nth-child(3) {
  animation-delay: 0.4s;
}

/* ==========================================================================
   Input Bar
   ========================================================================== */

.input-bar {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-sm) var(--space-sm) var(--space-lg);
  margin: var(--space-md);
  border-radius: var(--radius-full);
  animation: slideUp var(--duration-slow) var(--ease-out) 0.2s forwards;
  opacity: 0;
}

.input-bar__field {
  flex: 1;
  background: transparent;
  border: none;
  outline: none;
  color: var(--text-primary);
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  padding: var(--space-sm) 0;
  caret-color: var(--accent);
}

.input-bar__field::placeholder {
  color: var(--text-tertiary);
}

.input-bar__send {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border: none;
  border-radius: 50%;
  background: var(--accent);
  color: var(--bg-deep);
  cursor: pointer;
  font-size: var(--font-size-lg);
  transition: transform var(--duration-fast) var(--ease-spring),
              box-shadow var(--duration-fast) var(--ease-out),
              opacity var(--duration-fast) var(--ease-out);
  flex-shrink: 0;
}

.input-bar__send:hover {
  transform: scale(1.08);
  box-shadow: 0 0 16px var(--accent-glow);
}

.input-bar__send:active {
  transform: scale(0.95);
}

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

.input-bar__send:disabled {
  opacity: 0.4;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

/* Send arrow icon via CSS */
.input-bar__send svg {
  width: 18px;
  height: 18px;
  fill: none;
  stroke: var(--bg-deep);
  stroke-width: 2.5;
  stroke-linecap: round;
  stroke-linejoin: round;
}

/* ==========================================================================
   Streaming Token Animation
   ========================================================================== */

.stream-token {
  opacity: 0;
  animation: tokenFadeIn var(--duration-stream) var(--ease-out) forwards;
}

/* ==========================================================================
   Error Message
   ========================================================================== */

.message--error {
  color: var(--danger);
  font-size: var(--font-size-sm);
  align-self: center;
  max-width: 100%;
  text-align: center;
  background: rgba(255, 107, 107, 0.08);
  border-color: rgba(255, 107, 107, 0.2);
}

/* ==========================================================================
   Portfolio Page
   ========================================================================== */

.app--portfolio {
  overflow-y: auto;
}

.portfolio {
  flex: 1;
  padding: var(--space-xl) var(--space-md);
  overflow-y: auto;
}

.portfolio__hero {
  text-align: center;
  margin-bottom: var(--space-2xl);
  animation: slideFromLeft var(--duration-slow) var(--ease-out) forwards;
}

.portfolio__title {
  font-size: var(--font-size-hero);
  font-weight: var(--font-weight-semibold);
  letter-spacing: -0.03em;
  margin-bottom: var(--space-sm);
}

.portfolio__subtitle {
  color: var(--text-secondary);
  font-size: var(--font-size-lg);
}

.portfolio__grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--space-lg);
  max-width: 1000px;
  margin: 0 auto;
}

/* --- Project Cards --- */

.project-card {
  border-radius: var(--radius-md);
  overflow: hidden;
  cursor: default;
  opacity: 0;
  transform: translateY(20px);
  transition: opacity var(--duration-slow) var(--ease-out),
              transform var(--duration-slow) var(--ease-out),
              box-shadow var(--duration-fast) var(--ease-out),
              background var(--duration-fast) var(--ease-out);
}

.project-card.visible {
  opacity: 1;
  transform: translateY(0);
}

.project-card:hover {
  transform: translateY(-4px);
  background: var(--glass-bg-hover);
  box-shadow:
    0 12px 40px rgba(0, 0, 0, 0.4),
    inset 0 1px 0 var(--glass-highlight);
}

.project-card.visible:hover {
  transform: translateY(-4px);
}

.project-card__image {
  aspect-ratio: 16 / 10;
  overflow: hidden;
  border-bottom: 1px solid var(--glass-border);
}

.project-card__image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--duration-normal) var(--ease-out);
}

.project-card:hover .project-card__image img {
  transform: scale(1.03);
}

/* Placeholder for cards without screenshots yet */
.project-card__placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-surface);
  color: var(--text-tertiary);
  font-size: var(--font-size-sm);
}

.project-card__content {
  padding: var(--space-md) var(--space-lg);
}

.project-card__title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--space-xs);
  letter-spacing: -0.01em;
}

.project-card__desc {
  color: var(--text-secondary);
  font-size: var(--font-size-sm);
  line-height: 1.6;
  margin-bottom: var(--space-md);
}

.project-card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
}

.tag {
  display: inline-block;
  padding: var(--space-xs) var(--space-sm);
  background: var(--accent-surface);
  border: 1px solid var(--accent-border);
  border-radius: var(--radius-sm);
  font-size: var(--font-size-xs);
  color: var(--accent);
  font-weight: var(--font-weight-medium);
}

/* ==========================================================================
   Keyframes
   ========================================================================== */

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

@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes tokenFadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes pulse {
  0%, 80%, 100% {
    opacity: 0.3;
    transform: scale(0.8);
  }
  40% {
    opacity: 1;
    transform: scale(1);
  }
}

/* ==========================================================================
   Accessibility
   ========================================================================== */

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-delay: 0ms !important;
    transition-duration: 0.01ms !important;
  }
}

@media (prefers-contrast: more) {
  :root {
    --glass-bg: rgba(255, 255, 255, 0.12);
    --glass-border: rgba(255, 255, 255, 0.25);
    --text-primary: rgba(255, 255, 255, 1);
    --text-secondary: rgba(255, 255, 255, 0.75);
  }
}

/* Visually hidden (accessible to screen readers) */
.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;
}

/* Skip to content link */
.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-md);
  padding: var(--space-sm) var(--space-md);
  background: var(--accent);
  color: var(--bg-deep);
  border-radius: var(--radius-sm);
  font-weight: var(--font-weight-medium);
  text-decoration: none;
  z-index: 100;
  transition: top var(--duration-fast) var(--ease-out);
}

.skip-link:focus {
  top: var(--space-md);
}

/* ==========================================================================
   Responsive
   ========================================================================== */

@media (max-width: 600px) {
  .header {
    padding: var(--space-sm) var(--space-md);
  }

  .header__title {
    font-size: var(--font-size-base);
  }

  .messages {
    padding: var(--space-md) var(--space-sm);
  }

  .message {
    max-width: 90%;
    padding: var(--space-sm) var(--space-md);
  }

  .input-bar {
    margin: var(--space-sm);
    padding-left: var(--space-md);
  }

  .portfolio__title {
    font-size: var(--font-size-xl);
  }

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