/**
 * ============================================================================
 * styles.css — Arsitektur Visual & Estetika Edge (Fase 5 Final)
 * ============================================================================
 * Mobile-first, Technical Dark Mode, AdSense-compliant layout.
 * Includes: chat messages, KaTeX math, PrismJS code, ad separation.
 * ============================================================================
 */

/* ─── Google Fonts ───────────────────────────────────────────────────────── */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=JetBrains+Mono:wght@400;500&display=swap');

/* ─── CSS Custom Properties (Design Tokens) ──────────────────────────────── */

:root {
  /* Color Palette — Technical Dark Theme */
  --color-bg-primary: #0a0a0f;
  --color-bg-secondary: #12121a;
  --color-bg-tertiary: #1a1a28;
  --color-bg-elevated: #22223a;
  --color-bg-input: #16162a;
  --color-bg-user-bubble: #1e1e3a;
  --color-bg-ai-bubble: #14141f;

  --color-text-primary: #e8e8f0;
  --color-text-secondary: #9898b0;
  --color-text-muted: #5c5c78;
  --color-text-accent: #7c8aff;

  --color-accent: #6c63ff;
  --color-accent-hover: #8078ff;
  --color-accent-glow: rgba(108, 99, 255, 0.25);

  --color-success: #34d399;
  --color-warning: #fbbf24;
  --color-error: #f87171;

  --color-border: rgba(255, 255, 255, 0.06);
  --color-border-focus: rgba(108, 99, 255, 0.5);
  --color-ad-border: rgba(108, 99, 255, 0.12);

  /* Typography */
  --font-sans: 'Inter', 'Segoe UI', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.8125rem;
  --font-size-base: 0.9375rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.5rem;

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

  /* Layout */
  --header-height: 56px;
  --input-area-height: auto;
  --chat-max-width: 820px;
  --border-radius: 12px;
  --border-radius-sm: 8px;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 400ms ease;
}

/* ─── Reset & Base ───────────────────────────────────────────────────────── */

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

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  font-size: var(--font-size-base);
  color: var(--color-text-primary);
  background-color: var(--color-bg-primary);
  line-height: 1.6;
  min-height: 100dvh;
  overflow: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

/* ─── App Shell (Grid Layout) ────────────────────────────────────────────── */

.app-shell {
  display: grid;
  grid-template-rows: var(--header-height) 1fr auto auto;
  grid-template-areas:
    "header"
    "main"
    "ads"
    "input";
  height: 100dvh;
  max-width: 100vw;
  overflow: hidden;
}

/* ─── Header ─────────────────────────────────────────────────────────────── */

.app-header {
  grid-area: header;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--space-lg);
  background: var(--color-bg-secondary);
  border-bottom: 1px solid var(--color-border);
  z-index: 10;
}

.header-brand {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.brand-icon {
  font-size: 1.5rem;
  line-height: 1;
}

.brand-title {
  font-size: var(--font-size-lg);
  font-weight: 700;
  letter-spacing: -0.02em;
  background: linear-gradient(135deg, var(--color-accent), #a78bfa);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.header-status {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
}

.status-indicator {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  transition: background-color var(--transition-base);
}

.status-dot--connected {
  background-color: var(--color-success);
  box-shadow: 0 0 6px var(--color-success);
}

.status-dot--connecting {
  background-color: var(--color-warning);
  animation: pulse-dot 1.2s ease-in-out infinite;
}

.status-dot--disconnected {
  background-color: var(--color-error);
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.3; }
}

.status-label {
  font-size: var(--font-size-xs);
  color: var(--color-text-secondary);
}

.token-indicator {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-xs) var(--space-sm);
  background: var(--color-bg-tertiary);
  border-radius: 999px;
  border: 1px solid var(--color-border);
}

.token-icon {
  font-size: 0.875rem;
  line-height: 1;
}

.token-count {
  font-size: var(--font-size-sm);
  font-weight: 700;
  color: var(--color-text-accent);
  min-width: 1ch;
  text-align: center;
  transition: color var(--transition-fast);
}

.token-count[data-tokens="0"] {
  color: var(--color-text-muted);
}

.token-label {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
}

/* ─── Main Content (Chat Area) ───────────────────────────────────────────── */

.main-content {
  grid-area: main;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.chat-box {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-lg);
  scroll-behavior: smooth;
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  max-width: var(--chat-max-width);
  width: 100%;
  margin: 0 auto;
}

.chat-box::-webkit-scrollbar { width: 6px; }
.chat-box::-webkit-scrollbar-track { background: transparent; }
.chat-box::-webkit-scrollbar-thumb { background: var(--color-bg-elevated); border-radius: 3px; }
.chat-box::-webkit-scrollbar-thumb:hover { background: var(--color-text-muted); }

/* ─── Chat Messages ──────────────────────────────────────────────────────── */

.chat-message {
  display: flex;
  gap: var(--space-sm);
  max-width: 90%;
  animation: message-enter 0.3s ease-out;
}

@keyframes message-enter {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}

.chat-message--user {
  align-self: flex-end;
  flex-direction: row-reverse;
}

.chat-message--assistant {
  align-self: flex-start;
}

.chat-message--error {
  align-self: center;
  max-width: 100%;
}

.message-avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  flex-shrink: 0;
  background: var(--color-bg-tertiary);
  border: 1px solid var(--color-border);
}

.message-bubble {
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--border-radius);
  line-height: 1.65;
  font-size: var(--font-size-base);
  word-break: break-word;
  overflow-wrap: break-word;
}

.chat-message--user .message-bubble {
  background: var(--color-bg-user-bubble);
  border: 1px solid rgba(108, 99, 255, 0.15);
  color: var(--color-text-primary);
  border-bottom-right-radius: var(--space-xs);
}

.chat-message--assistant .message-bubble {
  background: var(--color-bg-ai-bubble);
  border: 1px solid var(--color-border);
  color: var(--color-text-primary);
  border-bottom-left-radius: var(--space-xs);
}

.message-bubble--error {
  background: rgba(248, 113, 113, 0.08);
  border: 1px solid rgba(248, 113, 113, 0.2);
  color: var(--color-error);
  font-size: var(--font-size-sm);
  text-align: center;
}

/* ─── Message Content: Markdown Rendered Elements ────────────────────────── */

.message-bubble h1,
.message-bubble h2,
.message-bubble h3,
.message-bubble h4 {
  margin-top: var(--space-md);
  margin-bottom: var(--space-sm);
  font-weight: 600;
  color: var(--color-text-primary);
  line-height: 1.3;
}

.message-bubble h1 { font-size: 1.3em; }
.message-bubble h2 { font-size: 1.15em; }
.message-bubble h3 { font-size: 1.05em; }
.message-bubble h4 { font-size: 1em; color: var(--color-text-secondary); }

.message-bubble p {
  margin-bottom: var(--space-sm);
}

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

.message-bubble ul,
.message-bubble ol {
  margin: var(--space-sm) 0;
  padding-left: var(--space-lg);
}

.message-bubble li {
  margin-bottom: var(--space-xs);
}

.message-bubble blockquote {
  margin: var(--space-sm) 0;
  padding: var(--space-sm) var(--space-md);
  border-left: 3px solid var(--color-accent);
  background: rgba(108, 99, 255, 0.05);
  border-radius: 0 var(--border-radius-sm) var(--border-radius-sm) 0;
  color: var(--color-text-secondary);
  font-style: italic;
}

.message-bubble hr {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: var(--space-md) 0;
}

.message-bubble a {
  color: var(--color-text-accent);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition-fast);
}

.message-bubble a:hover {
  border-bottom-color: var(--color-text-accent);
}

.message-bubble strong {
  font-weight: 600;
  color: var(--color-text-primary);
}

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

.message-bubble table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--space-sm) 0;
  font-size: var(--font-size-sm);
  overflow-x: auto;
  display: block;
}

.message-bubble th,
.message-bubble td {
  padding: var(--space-xs) var(--space-sm);
  border: 1px solid var(--color-border);
  text-align: left;
}

.message-bubble th {
  background: var(--color-bg-tertiary);
  font-weight: 600;
  color: var(--color-text-accent);
}

.message-bubble td {
  background: var(--color-bg-secondary);
}

/* Inline code (not in <pre>) */
.message-bubble code:not(pre code) {
  font-family: var(--font-mono);
  font-size: 0.85em;
  padding: 0.15em 0.4em;
  background: var(--color-bg-elevated);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  color: #e879f9;
  word-break: break-all;
}

/* ─── PrismJS Code Blocks ────────────────────────────────────────────────── */

.message-bubble pre {
  margin: var(--space-sm) 0;
  border-radius: var(--border-radius-sm);
  overflow: hidden;
  border: 1px solid var(--color-border);
  background: #1a1b26;
}

.message-bubble pre code {
  display: block;
  padding: var(--space-md);
  font-family: var(--font-mono);
  font-size: var(--font-size-sm);
  line-height: 1.7;
  overflow-x: auto;
  tab-size: 2;
  -webkit-overflow-scrolling: touch;
}

.message-bubble pre code::-webkit-scrollbar { height: 4px; }
.message-bubble pre code::-webkit-scrollbar-track { background: transparent; }
.message-bubble pre code::-webkit-scrollbar-thumb { background: var(--color-bg-elevated); border-radius: 2px; }

/* ─── KaTeX Math Rendering ───────────────────────────────────────────────── */
/* overflow-x: auto prevents long formulas from breaking mobile grid */

.message-bubble .katex-display {
  overflow-x: auto;
  overflow-y: hidden;
  -webkit-overflow-scrolling: touch;
  padding: var(--space-sm) 0;
  margin: var(--space-sm) 0;
}

.message-bubble .katex-display::-webkit-scrollbar { height: 3px; }
.message-bubble .katex-display::-webkit-scrollbar-thumb { background: var(--color-bg-elevated); border-radius: 2px; }

.message-bubble .katex {
  font-size: 1.05em;
  color: var(--color-text-primary);
}

.message-bubble .katex-error {
  font-family: var(--font-mono);
  font-size: var(--font-size-sm);
  color: var(--color-warning);
  background: rgba(251, 191, 36, 0.08);
  padding: 0.15em 0.4em;
  border-radius: 4px;
}

/* ─── Welcome Message ────────────────────────────────────────────────────── */

.welcome-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: var(--space-xl) var(--space-lg);
  margin: auto 0;
  gap: var(--space-sm);
}

.welcome-icon {
  font-size: 3rem;
  margin-bottom: var(--space-sm);
  animation: float 3s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}

.welcome-title {
  font-size: var(--font-size-xl);
  font-weight: 700;
  background: linear-gradient(135deg, var(--color-accent), #a78bfa, #ec4899);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.welcome-subtitle {
  font-size: var(--font-size-base);
  color: var(--color-text-secondary);
  max-width: 400px;
}

.welcome-hint {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  max-width: 360px;
}

/* ─── Typing Indicator ───────────────────────────────────────────────────── */

.typing-indicator {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-sm) var(--space-lg);
  max-width: var(--chat-max-width);
  width: 100%;
  margin: 0 auto;
}

.typing-indicator[hidden] { display: none; }

.typing-dot {
  width: 6px;
  height: 6px;
  background-color: var(--color-accent);
  border-radius: 50%;
  animation: typing-bounce 1.4s ease-in-out infinite;
}

.typing-dot:nth-child(2) { animation-delay: 0.2s; }
.typing-dot:nth-child(3) { animation-delay: 0.4s; }

@keyframes typing-bounce {
  0%, 60%, 100% { transform: translateY(0); opacity: 0.4; }
  30% { transform: translateY(-6px); opacity: 1; }
}

.typing-text {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  margin-left: var(--space-xs);
}

/* ─── Ad Container (AdSense Policy Compliant) ────────────────────────────── */
/* Clear visual separation from chat content per Google AdSense policies.
   The ad area is visually distinct with a labeled border and background
   differentiation so users never confuse ads with chat content. */

.ad-container {
  grid-area: ads;
  padding: var(--space-sm) var(--space-lg);
  background: var(--color-bg-secondary);
  border-top: 2px solid var(--color-ad-border);
  position: relative;
}

.ad-container::before {
  content: 'IKLAN';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translate(-50%, -50%);
  font-size: 0.625rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  color: var(--color-text-muted);
  background: var(--color-bg-secondary);
  padding: 0 var(--space-sm);
  text-transform: uppercase;
}

.ad-slot {
  max-width: var(--chat-max-width);
  margin: 0 auto;
}

.ad-placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-md);
  background: var(--color-bg-tertiary);
  border: 1px dashed var(--color-ad-border);
  border-radius: var(--border-radius-sm);
  text-align: center;
}

.ad-placeholder-icon { font-size: 1.5rem; }

.ad-placeholder-text {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

.ad-watch-btn {
  padding: var(--space-xs) var(--space-lg);
  font-family: var(--font-sans);
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: white;
  background: linear-gradient(135deg, var(--color-accent), #8078ff);
  border: none;
  border-radius: 999px;
  cursor: pointer;
  transition: all var(--transition-fast);
  position: relative;
  overflow: hidden;
}

.ad-watch-btn::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, transparent 40%, rgba(255,255,255,0.1) 50%, transparent 60%);
  transform: translateX(-100%);
  transition: transform 0.6s;
}

.ad-watch-btn:hover:not(:disabled)::after {
  transform: translateX(100%);
}

.ad-watch-btn:hover:not(:disabled) {
  background: linear-gradient(135deg, var(--color-accent-hover), #9088ff);
  box-shadow: 0 0 20px var(--color-accent-glow);
  transform: translateY(-1px);
}

.ad-watch-btn:active:not(:disabled) {
  transform: translateY(0);
}

.ad-watch-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
  background: var(--color-bg-elevated);
}

/* ─── Input Area ─────────────────────────────────────────────────────────── */

.input-area {
  grid-area: input;
  position: relative;
  padding: var(--space-sm) var(--space-lg) var(--space-md);
  background: var(--color-bg-secondary);
  border-top: 1px solid var(--color-border);
}

.lock-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  background: rgba(10, 10, 15, 0.85);
  backdrop-filter: blur(4px);
  z-index: 5;
}

.lock-overlay[hidden] { display: none; }

.lock-icon { font-size: 1.25rem; }

.lock-text {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

.input-group {
  display: flex;
  align-items: flex-end;
  gap: var(--space-sm);
  max-width: var(--chat-max-width);
  margin: 0 auto;
  background: var(--color-bg-input);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  padding: var(--space-sm);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.input-group:focus-within {
  border-color: var(--color-border-focus);
  box-shadow: 0 0 0 3px var(--color-accent-glow);
}

.input-textarea {
  flex: 1;
  min-height: 24px;
  max-height: 150px;
  padding: var(--space-xs) var(--space-sm);
  font-family: var(--font-sans);
  font-size: var(--font-size-base);
  color: var(--color-text-primary);
  background: transparent;
  border: none;
  outline: none;
  resize: none;
  line-height: 1.5;
}

.input-textarea::placeholder { color: var(--color-text-muted); }
.input-textarea:disabled { opacity: 0.5; cursor: not-allowed; }

.send-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  padding: 0;
  background: var(--color-accent);
  border: none;
  border-radius: 50%;
  cursor: pointer;
  transition: all var(--transition-fast);
  flex-shrink: 0;
}

.send-btn:hover:not(:disabled) {
  background: var(--color-accent-hover);
  transform: scale(1.05);
  box-shadow: 0 0 12px var(--color-accent-glow);
}

.send-btn:active:not(:disabled) { transform: scale(0.95); }

.send-btn:disabled {
  opacity: 0.3;
  cursor: not-allowed;
}

.send-icon {
  width: 16px;
  height: 16px;
  color: white;
}

.input-hint {
  display: flex;
  justify-content: flex-end;
  max-width: var(--chat-max-width);
  margin: var(--space-xs) auto 0;
}

.char-count {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
}

/* ─── Responsive Breakpoints (Mobile-First) ──────────────────────────────── */

@media (max-width: 640px) {
  :root {
    --space-lg: 1rem;
    --font-size-xl: 1.25rem;
    --chat-max-width: 100%;
  }

  .header-status { gap: var(--space-sm); }
  .status-label { display: none; }
  .token-label { display: none; }
  .welcome-container { padding: var(--space-lg) var(--space-md); }
  .chat-message { max-width: 95%; }

  .message-bubble pre code {
    font-size: var(--font-size-xs);
    padding: var(--space-sm);
  }

  .message-bubble table {
    font-size: var(--font-size-xs);
  }
}

@media (min-width: 1024px) {
  .chat-message { max-width: 80%; }
}

/* ─── Toast Notifications (P-06) ─────────────────────────────────────────── */

.toast-container {
  position: fixed;
  top: var(--space-md);
  right: var(--space-md);
  z-index: 10000;
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
  pointer-events: none;
  max-width: 360px;
}

.toast {
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-md);
  font-family: var(--font-primary);
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: #fff;
  pointer-events: auto;
  opacity: 0;
  transform: translateX(100%);
  transition: opacity 0.3s ease, transform 0.3s ease;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.4);
  backdrop-filter: blur(8px);
}

.toast-visible {
  opacity: 1;
  transform: translateX(0);
}

.toast-exit {
  opacity: 0;
  transform: translateX(100%);
}

.toast-success { background: rgba(16, 185, 129, 0.9); }
.toast-warning { background: rgba(245, 158, 11, 0.9); color: #1a1a28; }
.toast-error   { background: rgba(239, 68, 68, 0.9); }
.toast-info    { background: rgba(99, 102, 241, 0.9); }

/* ─── Persistent Banner (P-06) ───────────────────────────────────────────── */

.ad-banner-persistent {
  width: 100%;
  max-width: var(--chat-max-width);
  margin: var(--space-sm) auto;
  padding: var(--space-xs);
  border-top: 1px solid var(--color-border);
}

/* ===== P-07: Brand & Header ===== */
.brand {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-family: 'Sora', 'Nunito', system-ui, sans-serif;
  font-size: 1.25rem;
  color: var(--color-text-primary);
}
.brand-icon {
  color: var(--color-accent);
  font-size: 1.4rem;
  animation: pulse-icon 3s ease-in-out infinite;
}
.brand-name strong {
  font-weight: 800;
  background: linear-gradient(135deg, var(--color-accent), var(--color-accent-secondary, var(--color-accent)));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
@keyframes pulse-icon {
  0%, 100% { opacity: 1; transform: scale(1); }
  50%       { opacity: 0.7; transform: scale(1.08); }
}
.header-right {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}
.brand-highlight {
  background: linear-gradient(135deg, var(--color-accent), var(--color-accent-secondary, var(--color-accent)));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  font-weight: 800;
}

/* ===== P-07: Coin Display ===== */
.coin-display {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  font-size: 0.9rem;
  padding: 0.3rem 0.75rem;
  border-radius: 20px;
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  transition: all 0.3s ease;
  user-select: none;
}
.coin-display.coin-active {
  border-color: #f59e0b;
  background: rgba(245, 158, 11, 0.1);
  box-shadow: 0 0 12px rgba(245, 158, 11, 0.2);
}
.coin-count {
  font-weight: 800;
  font-size: 1.1rem;
  min-width: 1ch;
  text-align: center;
}
.coin-label {
  font-size: 0.75rem;
  opacity: 0.7;
}

/* ===== P-07: Welcome Content ===== */
.welcome-header {
  text-align: center;
  padding: 1.5rem 0 1rem;
}
.welcome-icon {
  font-size: 2.5rem;
  display: block;
  margin-bottom: 0.75rem;
  color: var(--color-accent);
}
.welcome-title {
  font-size: 1.6rem;
  font-weight: 800;
  margin: 0 0 0.5rem;
  line-height: 1.2;
}
.welcome-subtitle {
  font-size: 1rem;
  opacity: 0.7;
  margin: 0;
}
.welcome-how-it-works {
  margin: 1.25rem 0;
}
.welcome-how-it-works h2 {
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  opacity: 0.5;
  margin-bottom: 0.75rem;
}
.steps-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}
.steps-list li {
  display: flex;
  gap: 0.75rem;
  align-items: flex-start;
}
.step-num {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 1.75rem;
  height: 1.75rem;
  border-radius: 50%;
  background: var(--color-accent);
  color: #fff;
  font-size: 0.8rem;
  font-weight: 800;
  flex-shrink: 0;
  margin-top: 0.1rem;
}
.steps-list strong {
  display: block;
  font-size: 0.9rem;
  margin-bottom: 0.15rem;
}
.steps-list p {
  font-size: 0.82rem;
  opacity: 0.7;
  margin: 0;
  line-height: 1.5;
}

/* ===== P-07: CTA Button ===== */
.coin-cta-wrapper {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  padding: 1rem 0;
}
.coin-cta-btn {
  display: flex;
  align-items: center;
  gap: 0.875rem;
  padding: 0.875rem 1.75rem;
  border: none;
  border-radius: 14px;
  cursor: pointer;
  font-family: 'Sora', system-ui, sans-serif;
  text-align: left;
  transition: all 0.25s cubic-bezier(0.34, 1.56, 0.64, 1);
  position: relative;
  overflow: hidden;
  min-width: 260px;
  max-width: 360px;
  width: 100%;
  background: linear-gradient(135deg, #f59e0b, #d97706);
  color: #1a0a00;
  box-shadow: 0 4px 20px rgba(245, 158, 11, 0.35);
}
.coin-cta-btn[data-state="ready"]::before {
  content: '';
  position: absolute;
  top: 0; left: -100%;
  width: 60%; height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.25), transparent);
  animation: btn-shimmer 2.5s ease-in-out infinite;
}
@keyframes btn-shimmer {
  0%   { left: -100%; }
  60%  { left: 150%; }
  100% { left: 150%; }
}
.coin-cta-btn:hover[data-state="ready"] {
  transform: translateY(-2px) scale(1.02);
  box-shadow: 0 8px 28px rgba(245, 158, 11, 0.45);
}
.coin-cta-btn:active[data-state="ready"] {
  transform: translateY(0) scale(0.98);
}
.coin-cta-btn[data-state="loading"] {
  background: var(--color-surface-2);
  color: var(--color-text-muted);
  cursor: wait;
  box-shadow: none;
  animation: loading-pulse 1.5s ease-in-out infinite;
}
@keyframes loading-pulse {
  0%, 100% { opacity: 1; }
  50%       { opacity: 0.6; }
}
.coin-cta-btn[data-state="cooldown"] {
  background: var(--color-surface-2);
  color: var(--color-text-muted);
  cursor: not-allowed;
  box-shadow: none;
}
.coin-cta-btn[data-state="no-fill"] {
  background: rgba(251, 191, 36, 0.08);
  color: #fbbf24;
  border: 1px dashed #fbbf24;
  cursor: not-allowed;
  box-shadow: none;
}
.coin-cta-btn[data-state="has-coin"] {
  background: rgba(34, 197, 94, 0.1);
  color: #22c55e;
  border: 1px solid rgba(34, 197, 94, 0.3);
  cursor: default;
  box-shadow: none;
}
.coin-cta-btn[data-state="has-coin"]::before { display: none; }
.coin-cta-btn[disabled] { pointer-events: none; }
.btn-icon {
  font-size: 1.8rem;
  flex-shrink: 0;
  transition: transform 0.3s ease;
}
.coin-cta-btn:hover .btn-icon {
  transform: rotate(15deg) scale(1.2);
}
.btn-content {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}
.btn-title {
  font-size: 1rem;
  font-weight: 800;
  line-height: 1;
}
.btn-subtitle {
  font-size: 0.75rem;
  opacity: 0.75;
  font-weight: 400;
}
.cooldown-bar {
  width: 100%;
  max-width: 360px;
  height: 4px;
  background: var(--color-surface-2);
  border-radius: 2px;
  overflow: hidden;
  opacity: 0;
  transition: opacity 0.3s ease;
}
.cooldown-bar.visible { opacity: 1; }
.cooldown-fill {
  height: 100%;
  background: linear-gradient(90deg, #f59e0b, #d97706);
  border-radius: 2px;
  width: 100%;
  transform-origin: left;
}

/* ===== P-07: Feature Grid ===== */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 0.875rem;
  padding: 1rem 0;
  margin-top: 0.5rem;
}
.feature-card {
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 1.125rem;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}
.feature-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 24px rgba(0,0,0,0.15);
}
.feature-icon {
  font-size: 1.75rem;
  display: block;
  margin-bottom: 0.5rem;
}
.feature-card h3 {
  font-size: 0.9rem;
  font-weight: 700;
  margin: 0 0 0.4rem;
}
.feature-card p {
  font-size: 0.8rem;
  line-height: 1.6;
  opacity: 0.75;
  margin: 0;
}

/* ===== P-07: Input Area ===== */
.input-locked {
  position: relative;
}
.input-locked::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  border: 2px dashed var(--color-accent);
  opacity: 0.4;
  pointer-events: none;
  animation: lock-pulse 2s ease-in-out infinite;
}
@keyframes lock-pulse {
  0%, 100% { opacity: 0.2; }
  50%       { opacity: 0.5; }
}
.input-hints {
  font-size: 0.72rem;
  color: var(--color-text-muted);
  opacity: 0.55;
  text-align: right;
  padding: 0.2rem 0.5rem 0;
  display: flex;
  gap: 0.4rem;
  justify-content: flex-end;
}

/* ===== P-07: Ad Label ===== */
.ad-label {
  font-size: 0.68rem;
  color: var(--color-text-muted);
  text-align: center;
  margin-bottom: 3px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  opacity: 0.5;
}

/* ===== P-07: Footer ===== */
.site-footer {
  border-top: 1px solid var(--color-border);
  margin-top: auto;
}
.footer-content {
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  max-width: 720px;
  margin: 0 auto;
}
.footer-brand p { margin: 0 0 0.25rem; font-size: 0.85rem; }
.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}
.footer-links a {
  font-size: 0.8rem;
  opacity: 0.7;
  text-decoration: none;
  transition: opacity 0.2s;
}
.footer-links a:hover { opacity: 1; }
.footer-disclaimer {
  font-size: 0.75rem;
  opacity: 0.5;
  line-height: 1.6;
  margin: 0;
}
.footer-copyright {
  font-size: 0.75rem;
  opacity: 0.45;
  margin: 0;
}
.footer-copyright a { opacity: 0.7; }

/* ===== P-07: Mobile Responsive ===== */
@media (max-width: 640px) {
  .coin-cta-wrapper {
    position: sticky;
    bottom: 80px;
    z-index: 10;
    padding: 0.5rem 1rem;
    background: linear-gradient(to top, var(--color-bg, #0f1117) 80%, transparent);
  }
  .feature-grid {
    grid-template-columns: 1fr 1fr;
  }
  .welcome-title { font-size: 1.3rem; }
}
@media (max-width: 400px) {
  .feature-grid { grid-template-columns: 1fr; }
}