/* ==========================================================================
   Terminal Forge — Dark theme styles
   ========================================================================== */

/* -------------------------------------------------------------------------
   Design tokens
------------------------------------------------------------------------- */

:root {
  --forge-bg:           #0a0a0f;
  --forge-surface:      #12121a;
  --forge-elevated:     #1a1a2e;
  --forge-border:       #2a2a3d;
  --forge-border-h:     #3a3a55;
  --forge-text:         #e4e4ed;
  --forge-text-sec:     #8888a0;
  --forge-text-m:       #55556a;
  --forge-accent:       #006FD6;
  --forge-accent-glow:  rgba(0, 111, 214, 0.15);
  --forge-green:        #4ade80;
  --forge-error:        #ef4444;
  --forge-success:      #22c55e;
  --forge-warning:      #f59e0b;
  --forge-accent-hover: #3b9aff;
  --forge-code-text:    #e6edf3;
  --forge-frontmatter:  #0d1520;
  --forge-error-bg:     #1a0a0a;
  --forge-error-border: #3d2a2a;
  --forge-font-mono:    'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  --forge-font-body:    'Inter', ui-sans-serif, system-ui, -apple-system, sans-serif;
}

/* -------------------------------------------------------------------------
   Base
------------------------------------------------------------------------- */

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--forge-font-body);
  background-color: var(--forge-bg);
  background-image:
    linear-gradient(rgba(42, 42, 61, 0.3) 1px, transparent 1px),
    linear-gradient(90deg, rgba(42, 42, 61, 0.3) 1px, transparent 1px);
  background-size: 40px 40px;
  color: var(--forge-text);
}

/* -------------------------------------------------------------------------
   Prose (tutorial content — rendered markdown)
------------------------------------------------------------------------- */

.prose {
  color: var(--forge-text);
  line-height: 1.75;
}

.prose h1 {
  font-family: var(--forge-font-mono);
  font-size: 1.75rem;
  font-weight: 700;
  color: #fff;
  margin-top: 0;
  margin-bottom: 0.75rem;
  border-bottom: 1px solid var(--forge-border);
  padding-bottom: 0.5rem;
}

.prose h2 {
  font-family: var(--forge-font-mono);
  font-size: 1.25rem;
  font-weight: 600;
  color: #fff;
  margin-top: 2rem;
  margin-bottom: 0.75rem;
  padding-bottom: 0.25rem;
  border-bottom: 1px solid var(--forge-border);
}

.prose h3 {
  font-family: var(--forge-font-mono);
  font-size: 1rem;
  font-weight: 600;
  color: var(--forge-text);
  margin-top: 1.5rem;
  margin-bottom: 0.5rem;
}

.prose p {
  margin-top: 0;
  margin-bottom: 1rem;
}

.prose ul,
.prose ol {
  margin-top: 0;
  margin-bottom: 1rem;
  padding-left: 1.5rem;
}

.prose li {
  margin-bottom: 0.25rem;
}

.prose strong {
  font-weight: 600;
  color: #fff;
}

.prose code:not(pre code) {
  font-size: 0.85em;
  background: var(--forge-elevated);
  color: var(--forge-text);
  padding: 0.1em 0.35em;
  border-radius: 4px;
  border: 1px solid var(--forge-border);
  font-family: var(--forge-font-mono);
}

.prose pre {
  background: var(--forge-bg);
  color: var(--forge-code-text);
  border: 1px solid var(--forge-border);
  border-radius: 6px;
  padding: 1rem 1.25rem;
  overflow-x: auto;
  font-size: 0.8rem;
  line-height: 1.6;
  margin: 1rem 0 1.5rem;
  position: relative;
}

.prose pre code {
  background: transparent;
  color: inherit;
  padding: 0;
  border: none;
  font-size: inherit;
  font-family: var(--forge-font-mono);
}

.prose a {
  color: var(--forge-accent);
  text-decoration: none;
}

.prose a:hover {
  text-decoration: underline;
  color: var(--forge-accent-hover);
}

.prose blockquote {
  border-left: 3px solid var(--forge-accent);
  padding-left: 1rem;
  color: var(--forge-text-sec);
  margin: 1rem 0;
  font-style: italic;
}

.prose table {
  width: 100%;
  border-collapse: collapse;
  margin: 1rem 0 1.5rem;
  font-size: 0.875rem;
}

.prose th {
  background: var(--forge-elevated);
  font-weight: 600;
  text-align: left;
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--forge-border);
  color: var(--forge-text);
}

.prose td {
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--forge-border);
}

.prose tr:nth-child(even) td {
  background: var(--forge-surface);
}

/* YAML frontmatter — first code block */
.prose pre:first-of-type {
  background: var(--forge-frontmatter);
}

.prose hr {
  border: none;
  border-top: 1px solid var(--forge-border);
  margin: 2rem 0;
}

/* -------------------------------------------------------------------------
   Prose — detail page modifier (larger headings, link style)
------------------------------------------------------------------------- */

.prose--detail h1 { font-size: 1.875rem; margin-top: 2rem; }
.prose--detail h2 { font-size: 1.5rem; margin-top: 1.75rem; }
.prose--detail h3 { font-size: 1.25rem; }
.prose--detail h4 { font-size: 1.125rem; font-weight: 600; color: var(--forge-text); font-family: var(--forge-font-mono); margin-top: 1.25rem; margin-bottom: 0.5rem; }
.prose--detail a { text-decoration: underline; }
.prose--detail blockquote { border-left-width: 4px; margin: 1.5rem 0; }
.prose--detail li { line-height: 1.75; }

/* -------------------------------------------------------------------------
   Copy button (injected into pre blocks)
------------------------------------------------------------------------- */

.copy-btn {
  position: absolute;
  top: 0.5rem;
  right: 0.5rem;
  background: var(--forge-elevated);
  color: var(--forge-text-sec);
  border: 1px solid var(--forge-border);
  border-radius: 4px;
  padding: 0.2rem 0.55rem;
  font-size: 0.7rem;
  font-family: var(--forge-font-body);
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s, color 0.15s;
  z-index: 10;
}

.copy-btn:hover {
  background: var(--forge-border);
  border-color: var(--forge-border-h);
  color: var(--forge-text);
}

/* -------------------------------------------------------------------------
   Selector dropdowns
------------------------------------------------------------------------- */

.selector {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 20 20'%3E%3Cpath stroke='%238888a0' stroke-linecap='round' stroke-linejoin='round' stroke-width='1.5' d='M6 8l4 4 4-4'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.5rem center;
  background-size: 1.25em 1.25em;
  padding-right: 2.25rem;
  transition: border-color 0.15s, box-shadow 0.15s;
}

/* -------------------------------------------------------------------------
   Glow focus ring
------------------------------------------------------------------------- */

.glow-focus:focus {
  outline: none;
  border-color: var(--forge-accent);
  box-shadow: 0 0 0 1px var(--forge-accent), 0 0 15px rgba(0, 111, 214, 0.2);
}

/* -------------------------------------------------------------------------
   Mobile nav
------------------------------------------------------------------------- */

.mobile-nav-closed {
  max-height: 0;
  opacity: 0;
  transition: max-height 0.25s ease, opacity 0.2s ease;
}

.mobile-nav-open {
  max-height: 200px;
  opacity: 1;
  transition: max-height 0.25s ease, opacity 0.2s ease;
}

/* -------------------------------------------------------------------------
   Hero gradient shimmer
------------------------------------------------------------------------- */

.hero-shimmer {
  background: linear-gradient(
    90deg,
    #ffffff 0%,
    var(--forge-accent-hover) 30%,
    var(--forge-accent) 50%,
    var(--forge-accent-hover) 70%,
    #ffffff 100%
  );
  background-size: 200% 100%;
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  animation: shimmer 6s ease-in-out infinite;
}

@keyframes shimmer {
  0%, 100% { background-position: 100% 0; }
  50% { background-position: 0% 0; }
}

/* -------------------------------------------------------------------------
   Glassmorphism card border
------------------------------------------------------------------------- */

.card-gradient {
  position: relative;
  border-color: transparent;
  background-clip: padding-box;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.03);
}

.card-gradient::before {
  content: '';
  position: absolute;
  inset: -1px;
  border-radius: inherit;
  padding: 1px;
  background: linear-gradient(135deg, var(--forge-accent) 0%, var(--forge-border) 40%, var(--forge-border-h) 60%, var(--forge-accent-hover) 100%);
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  pointer-events: none;
}

/* -------------------------------------------------------------------------
   Stream pre
------------------------------------------------------------------------- */

#stream-pre {
  font-family: var(--forge-font-mono);
  font-size: 0.75rem;
  line-height: 1.5;
}

/* Blinking cursor while streaming */
#stream-pre.streaming::after {
  content: '|';
  color: var(--forge-green);
  animation: blink-cursor 0.8s step-end infinite;
}

@keyframes blink-cursor {
  0%, 100% { opacity: 1; }
  50% { opacity: 0; }
}

/* -------------------------------------------------------------------------
   Terminal dots (red/yellow/green)
------------------------------------------------------------------------- */

.terminal-dots {
  display: flex;
  align-items: center;
  gap: 6px;
}

.terminal-dots span {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  display: inline-block;
}

.terminal-dots .dot-red    { background: var(--forge-error); }
.terminal-dots .dot-yellow { background: var(--forge-warning); }
.terminal-dots .dot-green  { background: var(--forge-success); }

/* -------------------------------------------------------------------------
   Card staggered fade-in
------------------------------------------------------------------------- */

.forge-card {
  opacity: 0;
  animation: forge-fade-in 0.4s ease-out forwards;
}

.forge-card:nth-child(1) { animation-delay: 0ms; }
.forge-card:nth-child(2) { animation-delay: 80ms; }
.forge-card:nth-child(3) { animation-delay: 160ms; }
.forge-card:nth-child(4) { animation-delay: 240ms; }
.forge-card:nth-child(5) { animation-delay: 320ms; }
.forge-card:nth-child(6) { animation-delay: 400ms; }
.forge-card:nth-child(7) { animation-delay: 480ms; }
.forge-card:nth-child(8) { animation-delay: 560ms; }
.forge-card:nth-child(9) { animation-delay: 640ms; }

@keyframes forge-fade-in {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* -------------------------------------------------------------------------
   Button hover glow
------------------------------------------------------------------------- */

.btn-glow {
  transition: background-color 0.15s, box-shadow 0.2s;
}

.btn-glow:hover:not(:disabled) {
  box-shadow: 0 0 20px rgba(0, 111, 214, 0.35), 0 0 40px rgba(0, 111, 214, 0.15);
}

/* -------------------------------------------------------------------------
   Status line
------------------------------------------------------------------------- */

#status-line {
  white-space: pre-wrap;
}

/* -------------------------------------------------------------------------
   Selector cascade pulse
------------------------------------------------------------------------- */

.selector-pulse {
  animation: selector-glow 0.6s ease-out;
}

@keyframes selector-glow {
  0% {
    border-color: var(--forge-accent);
    box-shadow: 0 0 0 1px var(--forge-accent), 0 0 15px rgba(0, 111, 214, 0.3);
  }
  100% {
    border-color: var(--forge-border);
    box-shadow: none;
  }
}

/* -------------------------------------------------------------------------
   Reading progress bar (tutorial detail page)
------------------------------------------------------------------------- */

.reading-progress-bar {
  position: fixed;
  top: 0;
  left: 0;
  width: 0%;
  height: 3px;
  background: linear-gradient(90deg, var(--forge-accent), var(--forge-accent-hover));
  z-index: 50;
  transition: width 0.1s linear;
}

/* -------------------------------------------------------------------------
   Stream terminal glow (while streaming)
------------------------------------------------------------------------- */

#stream-container:has(.streaming) {
  box-shadow: 0 0 20px rgba(74, 222, 128, 0.12), 0 0 40px rgba(74, 222, 128, 0.06);
}

/* Scanline overlay on stream pre */
#stream-pre::before {
  content: '';
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 2px,
    rgba(74, 222, 128, 0.015) 2px,
    rgba(74, 222, 128, 0.015) 4px
  );
  pointer-events: none;
  z-index: 1;
}

/* -------------------------------------------------------------------------
   Gallery card — hover lift + product colour accents
------------------------------------------------------------------------- */

.gallery-card {
  border-left: 2px solid var(--forge-border);
  transition: transform 0.2s, box-shadow 0.2s, border-color 0.2s;
}

.gallery-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3), 0 0 15px rgba(0, 111, 214, 0.15);
}

/* Product-specific left border colours */
.gallery-card[data-product="sms"]   { border-left-color: #4ade80; }
.gallery-card[data-product="voice"] { border-left-color: #3b9aff; }
.gallery-card[data-product="iot"]   { border-left-color: #f59e0b; }
.gallery-card[data-product="sip"]   { border-left-color: #a855f7; }
.gallery-card[data-product="ai"]    { border-left-color: #ec4899; }