:root {
    --bg: #0a0a0a;
    --surface: #111111;
    --surface2: #1a1a1a;
    --card: #161616;
    --border: #222222;
    --orange: #f7931a;
    --orange-dim: #c4741200;
    --learn-orange-dim: #7a4800;
    --orange-glow: rgba(247, 147, 26, 0.15);
    --text: #f0ede8;
    --muted: #666;
    --soft: #333333;
    --white: #ffffff;
    --green: #00d68f;
    --red: #ff4444;
    --radius: 12px;
    --font-serif: 'DM Sans', sans-serif;
    --font-sans: 'DM Sans', system-ui, sans-serif;
    --font-mono: 'DM Mono', monospace;
  }

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

  body {
    font-family: 'DM Sans', sans-serif;
    background: var(--bg);
    color: var(--text);
    height: 100vh;
    display: flex;
    flex-direction: column;
    overflow: hidden;
  }

  @media (max-width: 600px) {
    body {
      height: auto;
      min-height: 100vh;
      overflow-y: auto;
      overflow-x: hidden;
      -webkit-overflow-scrolling: touch;
    }

    #start-screen {
      justify-content: flex-start;
      padding: 32px 24px 48px;
      min-height: calc(100vh - 60px);
    }

    #chat-section,
    #free-chat-section {
      height: calc(100vh - 60px);
      min-height: 0;
    }
  }

  /* Grain texture overlay */
  body::before {
    content: '';
    position: fixed;
    inset: 0;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)' opacity='0.04'/%3E%3C/svg%3E");
    pointer-events: none;
    z-index: 0;
    opacity: 0.4;
  }

  /* Header */
  .header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 28px;
    border-bottom: 1px solid var(--border);
    background: var(--surface);
    position: relative;
    z-index: 10;
    flex-shrink: 0;
  }

  .logo {
    display: flex;
    align-items: center;
    gap: 12px;
  }

  .logo-icon {
    width: 36px;
    height: 36px;
    background: var(--orange);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    font-weight: 600;
    color: #000;
    font-family: 'DM Mono', monospace;
  }

  .logo-text {
    font-size: 17px;
    font-weight: 500;
    letter-spacing: 0.01em;
    font-family: 'DM Sans', sans-serif;
  }

  .logo-text span {
    color: var(--orange);
    /* font-style: italic; */
    /* font-family: 'DM Sans', sans-serif; */
  }

  .progress-bar-wrapper {
    display: flex;
    align-items: center;
    gap: 12px;
    font-family: 'DM Mono', monospace;
    font-size: 12px;
    color: var(--muted);
  }

  .progress-track {
    width: 140px;
    height: 4px;
    background: var(--border);
    border-radius: 2px;
    overflow: hidden;
  }

  .progress-fill {
    height: 100%;
    background: var(--orange);
    border-radius: 2px;
    width: 0%;
    transition: width 0.5s ease;
  }

  .reward-badge {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 6px 14px;
    background: var(--orange-glow);
    border: 1px solid rgba(247, 147, 26, 0.3);
    border-radius: 20px;
    font-family: 'DM Mono', monospace;
    font-size: 12px;
    color: var(--orange);
  }

  /* Chat area */
  .chat-container {
    flex: 1;
    overflow-y: auto;
    padding: 28px;
    display: flex;
    flex-direction: column;
    gap: 16px;
    position: relative;
    z-index: 1;
    scroll-behavior: smooth;
  }

  .chat-container::-webkit-scrollbar { width: 4px; }
  .chat-container::-webkit-scrollbar-track { background: transparent; }
  .chat-container::-webkit-scrollbar-thumb { background: var(--border); border-radius: 2px; }

  .msg {
    display: flex;
    gap: 12px;
    max-width: 720px;
    animation: fadeUp 0.3s ease forwards;
    opacity: 0;
  }

  @keyframes fadeUp {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
  }

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

  .msg-avatar {
    width: 34px;
    height: 34px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    flex-shrink: 0;
    margin-top: 2px;
  }

  .msg.bot .msg-avatar {
    background: var(--orange);
    color: #000;
    font-weight: 600;
    font-family: 'DM Mono', monospace;
  }

  .msg.user .msg-avatar {
    background: var(--surface2);
    color: var(--text);
    border: 1px solid var(--border);
  }

  .msg-bubble {
    padding: 14px 18px;
    border-radius: 14px;
    font-size: 15px;
    line-height: 1.6;
    max-width: calc(100% - 50px);
  }

  .msg.bot .msg-bubble {
    background: var(--surface);
    border: 1px solid var(--border);
    border-top-left-radius: 4px;
  }

  .msg.user .msg-bubble {
    background: var(--orange);
    color: #000;
    font-weight: 600;
    border-top-right-radius: 4px;
  }

  /* Typing indicator */
  .typing {
    display: flex;
    align-items: center;
    gap: 5px;
    padding: 14px 18px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 14px;
    border-top-left-radius: 4px;
    width: fit-content;
  }

  .typing span {
    width: 7px;
    height: 7px;
    background: var(--orange);
    border-radius: 50%;
    animation: bounce 1.2s infinite;
    opacity: 0.6;
  }

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

  @keyframes bounce {
    0%, 80%, 100% { transform: translateY(0); }
    40% { transform: translateY(-6px); opacity: 1; }
  }

  /* Input area */
  .input-area {
    padding: 20px 28px;
    border-top: 1px solid var(--border);
    background: var(--surface);
    position: relative;
    z-index: 10;
    flex-shrink: 0;
  }

  .input-row {
    display: flex;
    gap: 10px;
    align-items: flex-end;
  }

  .input-box {
    flex: 1;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 14px 18px;
    color: var(--text);
    font-family: 'DM Sans', sans-serif;
    font-size: 15px;
    resize: none;
    outline: none;
    max-height: 120px;
    min-height: 52px;
    transition: border-color 0.2s;
    line-height: 1.5;
  }

  .input-box:focus { border-color: var(--orange); }
  .input-box::placeholder { color: var(--muted); }

  .send-btn {
    width: 52px;
    height: 52px;
    background: var(--orange);
    border: none;
    border-radius: 12px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
    flex-shrink: 0;
  }

  .send-btn:hover { background: #e8881a; transform: scale(1.03); }
  .send-btn:active { transform: scale(0.97); }
  .send-btn:disabled { opacity: 0.4; cursor: not-allowed; transform: none; }

  .send-btn svg { color: #000; }

  /* Start screen */
  #start-screen {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    flex: 1;
    gap: 32px;
    position: relative;
    z-index: 1;
    padding: 40px;
    text-align: center;
  }

  .hero-icon {
    width: 80px;
    height: 80px;
    background: var(--orange);
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 40px;
    font-weight: 900;
    color: #000;
    font-family: 'DM Mono', monospace;
    box-shadow: 0 0 60px rgba(247, 147, 26, 0.4);
    animation: pulse 3s ease-in-out infinite;
  }

  @keyframes pulse {
    0%, 100% { box-shadow: 0 0 40px rgba(247, 147, 26, 0.3); }
    50% { box-shadow: 0 0 80px rgba(247, 147, 26, 0.6); }
  }

  .hero-title {
    font-size: clamp(28px, 5vw, 44px);
    font-weight: 400;
    line-height: 1.1;
    letter-spacing: -0.5px;
    /* font-family: 'DM Sans', sans-serif; */
  }

  .hero-title em {
    /* font-style: italic; */
    color: var(--orange);
  }

  .hero-sub {
    font-size: 16px;
    color: var(--muted);
    max-width: 460px;
    line-height: 1.7;
  }

  .stats-row {
    display: flex;
    gap: 24px;
    flex-wrap: wrap;
    justify-content: center;
  }

  .stat-chip {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 18px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 20px;
    font-family: 'DM Mono', monospace;
    font-size: 13px;
  }

  .stat-chip .dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--orange);
  }

  .start-btn {
    padding: 18px 48px;
    background: var(--orange);
    border: none;
    border-radius: 14px;
    color: #000;
    font-family: 'DM Sans', sans-serif;
    font-size: 17px;
    font-weight: 600;
    cursor: pointer;
    letter-spacing: -0.3px;
    transition: all 0.2s;
    box-shadow: 0 8px 30px rgba(247, 147, 26, 0.3);
  }

  .start-btn:hover { transform: translateY(-2px); box-shadow: 0 12px 40px rgba(247, 147, 26, 0.4); }
  .start-btn:active { transform: translateY(0); }

  /* Claim panel */
  #claim-panel {
    display: none;
    flex-direction: column;
    align-items: center;
    gap: 20px;
    padding: 32px;
    margin: 16px 28px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 16px;
    text-align: center;
    position: relative;
    z-index: 5;
  }

  .claim-score {
    font-size: 56px;
    font-weight: 600;
    font-family: 'DM Mono', monospace;
    color: var(--orange);
    line-height: 1;
  }

  .claim-label { font-size: 13px; color: var(--muted); font-family: 'DM Mono', monospace; }
  .claim-title { font-size: 22px; font-weight: 600; }
  .claim-sub { font-size: 14px; color: var(--muted); }

  .wallet-input-row {
    display: flex;
    gap: 10px;
    width: 100%;
    max-width: 500px;
  }

  .wallet-input {
    flex: 1;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 12px 16px;
    color: var(--text);
    font-family: 'DM Mono', monospace;
    font-size: 13px;
    outline: none;
    transition: border-color 0.2s;
  }

  .wallet-input:focus { border-color: var(--orange); }
  .wallet-input::placeholder { color: var(--muted); }

  .claim-btn {
    padding: 12px 24px;
    background: var(--orange);
    border: none;
    border-radius: 10px;
    color: #000;
    font-family: 'DM Sans', sans-serif;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    white-space: nowrap;
  }

  .claim-btn:hover { background: #e8881a; }
  .claim-btn:disabled { opacity: 0.4; cursor: not-allowed; }

  .fail-panel {
    padding: 24px;
    background: rgba(255, 68, 68, 0.08);
    border: 1px solid rgba(255, 68, 68, 0.2);
    border-radius: 12px;
    color: var(--red);
    font-size: 14px;
  }

  .success-msg {
    padding: 16px 24px;
    background: rgba(0, 214, 143, 0.08);
    border: 1px solid rgba(0, 214, 143, 0.2);
    border-radius: 10px;
    color: var(--green);
    font-size: 14px;
    font-family: 'DM Mono', monospace;
    display: none;
  }

  #chat-section { display: none; flex-direction: column; height: 100%; }

  /* Scrollbar for chat */
  .scroll-anchor { height: 1px; }

  /* ── NAVBAR RESPONSIVE ───────────────────────────── */
  .header-right {
    display: flex;
    align-items: center;
    gap: 12px;
  }

  /* Hamburger button — hidden on desktop */
  .hamburger-btn {
    display: none;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 5px;
    width: 40px;
    height: 40px;
    background: var(--surface2);
    border: 1px solid var(--border);
    border-radius: 10px;
    cursor: pointer;
    padding: 0;
    flex-shrink: 0;
  }

  .hamburger-btn span {
    display: block;
    width: 18px;
    height: 2px;
    background: var(--text);
    border-radius: 2px;
    transition: all 0.25s ease;
    transform-origin: center;
  }

  .hamburger-btn.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
  .hamburger-btn.open span:nth-child(2) { opacity: 0; transform: scaleX(0); }
  .hamburger-btn.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

  /* Mobile overlay */
  .mobile-menu-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.6);
    z-index: 98;
    backdrop-filter: blur(2px);
    opacity: 0;
    transition: opacity 0.25s ease;
  }
  .mobile-menu-overlay.open {
    display: block;
    opacity: 1;
  }

  /* Mobile drawer */
  .mobile-drawer {
    display: none;
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    width: 280px;
    max-width: 85vw;
    background: var(--surface);
    border-left: 1px solid var(--border);
    z-index: 99;
    flex-direction: column;
    transform: translateX(100%);
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  }
  .mobile-drawer.open {
    transform: translateX(0);
  }

  .drawer-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px 20px 16px;
    border-bottom: 1px solid var(--border);
  }

  .drawer-close {
    width: 36px;
    height: 36px;
    background: var(--surface2);
    border: 1px solid var(--border);
    border-radius: 8px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--muted);
    transition: color 0.2s;
  }
  .drawer-close:hover { color: var(--text); }

  .drawer-nav {
    display: flex;
    flex-direction: column;
    gap: 4px;
    padding: 16px 12px;
  }

  .drawer-item {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 14px 16px;
    border: 1px solid transparent;
    border-radius: var(--radius);
    background: transparent;
    cursor: pointer;
    text-align: left;
    transition: all 0.2s;
    width: 100%;
  }

  .drawer-item:hover {
    background: var(--surface2);
    border-color: var(--border);
  }

  .drawer-item.active {
    background: var(--surface2);
    border-color: var(--border);
  }
  .drawer-item.active .drawer-item-title { color: var(--orange); }
  .drawer-item.active .drawer-item-icon { color: var(--orange); }
  .drawer-item.active .drawer-item-arrow { color: var(--orange); opacity: 1; }

  .drawer-item-icon {
    width: 36px;
    height: 36px;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--muted);
    flex-shrink: 0;
    transition: color 0.2s;
  }

  .drawer-item-text { flex: 1; }

  .drawer-item-title {
    font-size: 14px;
    font-weight: 500;
    color: var(--text);
    margin-bottom: 2px;
    transition: color 0.2s;
  }

  .drawer-item-sub {
    font-size: 12px;
    color: var(--muted);
  }

  .drawer-item-arrow {
    font-size: 14px;
    color: var(--muted);
    opacity: 0.5;
    transition: all 0.2s;
  }

  @media (max-width: 600px) {
    .hamburger-btn { display: flex; }
    #mode-tabs-desktop { display: none; }
    .mobile-drawer { display: flex; }
    .header { padding: 14px 18px; }
    .progress-track { width: 90px; }
  }

  /* ── MODE TABS ───────────────────────────────────── */
  .mode-tabs {
    display: flex;
    gap: 4px;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 3px;
  }

  .mode-tab {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 7px 16px;
    border: none;
    border-radius: 7px;
    background: transparent;
    color: var(--muted);
    font-family: 'DM Sans', sans-serif;
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
  }

  .mode-tab.active {
    background: var(--surface2);
    color: var(--text);
    border: 1px solid var(--border);
  }

  .mode-tab:hover:not(.active) { color: var(--text); }

  /* ── FREE CHAT WELCOME ───────────────────────────── */
  .free-chat-welcome {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
    padding: 48px 28px 32px;
    text-align: center;
    max-width: 560px;
    margin: 0 auto;
  }

  .fcw-icon {
    width: 52px;
    height: 52px;
    background: var(--orange-glow);
    border: 1px solid rgba(247,147,26,0.25);
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: 'DM Mono', monospace;
    font-size: 22px;
    color: var(--orange);
  }

  .fcw-title {
    /* font-family: 'DM Sans', sans-serif; */
    font-size: 26px;
    font-weight: 400;
    line-height: 1.2;
  }

  .fcw-title em { color: var(--orange); /* font-style: italic; */ }

  .fcw-sub {
    font-size: 14px;
    color: var(--muted);
    line-height: 1.6;
  }

  .fcw-chips {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    justify-content: center;
    margin-top: 8px;
  }

  .fcw-chip {
    padding: 8px 16px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 20px;
    color: var(--text);
    font-family: 'DM Sans', sans-serif;
    font-size: 13px;
    cursor: pointer;
    transition: all 0.18s;
  }

  .fcw-chip:hover {
    border-color: var(--orange);
    color: var(--orange);
    background: var(--orange-glow);
  }

  /* Response time badge */
  .resp-time {
    font-family: 'DM Mono', monospace;
    font-size: 10px;
    color: var(--muted);
    text-align: center;
    opacity: 0.6;
    margin-top: -8px;
  }

  /* Markdown-style message formatting */
  .msg-bubble strong { font-weight: 600; }
  .msg-bubble em { font-style: italic; opacity: 0.85; }
  .msg-bubble code {
    font-family: 'DM Mono', monospace;
    font-size: 12px;
    background: rgba(255,255,255,0.07);
    padding: 1px 5px;
    border-radius: 4px;
  }

  /* ── SPLASH SCREEN ───────────────────────────────── */
  #splash {
    position: fixed;
    inset: 0;
    background: var(--bg);
    z-index: 100;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0;
    pointer-events: none;
  }

  #splash.hide {
    animation: splashFade 0.6s ease forwards;
  }

  @keyframes splashFade {
    0%   { opacity: 1; transform: none; }
    100% { opacity: 0; transform: translateY(-8px); }
  }

  .splash-ring {
    position: relative;
    width: 96px;
    height: 96px;
    margin-bottom: 36px;
  }

  .splash-ring svg {
    position: absolute;
    inset: 0;
    animation: spinRing 2.4s linear infinite;
    opacity: 0;
    animation-fill-mode: forwards;
    animation-delay: 0.2s;
  }

  @keyframes spinRing {
    0%   { opacity: 0; transform: rotate(0deg); }
    10%  { opacity: 1; }
    100% { opacity: 1; transform: rotate(360deg); }
  }

  .splash-btc {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: 'DM Mono', monospace;
    font-size: 32px;
    font-weight: 700;
    color: var(--orange);
    opacity: 0;
    animation: fadeIn 0.4s ease 0.5s forwards;
  }

  .splash-wordmark {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    opacity: 0;
    transform: translateY(6px);
    animation: wordmarkIn 0.5s ease 0.7s forwards;
  }

  @keyframes wordmarkIn {
    to { opacity: 1; transform: translateY(0); }
  }

  .splash-name { 
      /* font-family: 'DM Sans', sans-serif; */
    font-weight: 400;
    letter-spacing: 0;
  }

.splash-name span { color: var(--orange); /* font-style: italic; */ }

  .splash-tagline {
    font-family: 'DM Mono', monospace;
    font-size: 11px;
    color: var(--muted);
    letter-spacing: 0.12em;
    text-transform: uppercase;
  }

  .splash-line {
    width: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--orange), transparent);
    margin: 28px 0;
    animation: lineGrow 0.7s ease 1s forwards;
  }

  @keyframes lineGrow {
    to { width: 120px; }
  }

  .splash-loading {
    display: flex;
    gap: 6px;
    opacity: 0;
    animation: fadeIn 0.3s ease 1.4s forwards;
  }

  .splash-dot {
    width: 5px;
    height: 5px;
    border-radius: 50%;
    background: var(--orange);
    opacity: 0.3;
    animation: dotPulse 1.2s ease-in-out infinite;
  }

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

  @keyframes dotPulse {
    0%, 100% { opacity: 0.25; transform: scale(1); }
    50%       { opacity: 1;    transform: scale(1.4); }
  }

  @keyframes fadeIn {
    to { opacity: 1; }
  }
  /* ── MARKDOWN RENDERING ──────────────────────────── */
  .msg-bubble.markdown p { margin-bottom: 10px; }
  .msg-bubble.markdown p:last-child { margin-bottom: 0; }

  .msg-bubble.markdown h1,
  .msg-bubble.markdown h2,
  .msg-bubble.markdown h3 {
    font-family: 'DM Sans', sans-serif;
    font-weight: 600;
    margin: 14px 0 6px;
    line-height: 1.3;
  }
  .msg-bubble.markdown h1 { font-size: 17px; }
  .msg-bubble.markdown h2 { font-size: 15px; }
  .msg-bubble.markdown h3 { font-size: 14px; color: var(--orange); }

  .msg-bubble.markdown ul,
  .msg-bubble.markdown ol {
    padding-left: 20px;
    margin: 8px 0;
    display: flex;
    flex-direction: column;
    gap: 4px;
  }

  .msg-bubble.markdown li { line-height: 1.6; }

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

  .msg-bubble.markdown em { font-style: italic; opacity: 0.85; }

  .msg-bubble.markdown code {
    font-family: 'DM Mono', monospace;
    font-size: 12px;
    background: rgba(255, 255, 255, 0.07);
    padding: 2px 6px;
    border-radius: 4px;
  }

  .msg-bubble.markdown pre {
    background: rgba(0,0,0,0.3);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 12px 14px;
    overflow-x: auto;
    margin: 10px 0;
  }

  .msg-bubble.markdown pre code {
    background: none;
    padding: 0;
    font-size: 13px;
    line-height: 1.6;
  }

  .msg-bubble.markdown blockquote {
    border-left: 3px solid var(--orange);
    padding-left: 12px;
    margin: 8px 0;
    opacity: 0.8;
    font-style: italic;
  }

  .msg-bubble.markdown hr {
    border: none;
    border-top: 1px solid var(--border);
    margin: 12px 0;
  }

  .msg-bubble.markdown a {
    color: var(--orange);
    text-decoration: underline;
    text-underline-offset: 2px;
  }
/* ── LEARN PAGE STYLES ──────────────────────────────── */
.learn-page {
  position: relative;
  z-index: 1;
  display: none;
  flex-direction: column;
  overflow-y: auto;
  height: 100%;
}

.learn-page section {
  padding: 60px 20px;
  max-width: 1000px;
  margin: 0 auto;
  width: 100%;
}

/* ── HERO ──────────────────────────────────────────────── */
.learn-page .hero {
  min-height: 42vh;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding-top: 120px;
  padding-bottom: 60px;
  border-bottom: 1px solid var(--border);
}

.learn-page .hero-eyebrow {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--orange);
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 10px;
}
.learn-page .hero-eyebrow::before {
  content: '';
  width: 24px;
  height: 1px;
  background: var(--orange);
  display: inline-block;
}

.learn-page .hero h1 {
  font-family: var(--font-serif);
  font-size: clamp(2rem, 7vw, 5.5rem);
  font-weight: 400;
  line-height: 1.05;
  color: var(--white);
  margin-bottom: 24px;
}

.learn-page .hero h1 em {
  font-style: italic;
  color: var(--orange);
}

.learn-page .hero-sub {
  max-width: 560px;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.7;
}

.learn-page .hero-nav {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 36px;
}

.learn-page .hero-nav a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  border: 1px solid var(--border);
  border-radius: 999px;
  font-size: 12px;
  color: var(--muted);
  text-decoration: none;
  transition: border-color 0.2s, color 0.2s;
}
.learn-page .hero-nav a:hover { border-color: var(--orange); color: var(--orange); }

/* ── SECTION HEADERS ───────────────────────────────────── */
.learn-page .sec-header {
  display: flex;
  align-items: baseline;
  gap: 16px;
  margin-bottom: 40px;
  flex-wrap: wrap;
}
.learn-page .sec-num {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--orange);
  letter-spacing: 0.1em;
  flex-shrink: 0;
}
.learn-page .sec-title {
  font-family: var(--font-sans);
  font-size: clamp(1.5rem, 4vw, 2.8rem);
  font-weight: 500;
  color: var(--white);
  line-height: 1.15;
}
.learn-page .sec-title em { font-style: italic; color: var(--orange); }

/* ── DIVIDER ───────────────────────────────────────────── */
.learn-page .divider {
  width: 100%;
  height: 1px;
  background: var(--border);
  margin: 0 auto;
}

/* ────────────────────────────────────────────────────────
   MÓDULO 1 — PROBLEMAS
──────────────────────────────────────────────────────── */
.learn-page #problemas { border-bottom: 1px solid var(--border); }

.learn-page .problems-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2px;
}

@media (max-width: 900px) {
  .learn-page .problems-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 540px) {
  .learn-page .problems-grid {
    grid-template-columns: 1fr;
  }
}

.learn-page .problem-card {
  background: var(--card);
  padding: 28px 22px;
  position: relative;
  overflow: hidden;
  cursor: default;
  transition: background 0.3s;
}

.learn-page .problem-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0;
  width: 3px;
  height: 0;
  background: var(--orange);
  transition: height 0.4s ease;
}
.learn-page .problem-card:hover::before { height: 100%; }
.learn-page .problem-card:hover { background: #1a1a1a; }

.learn-page .problem-num {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--learn-orange-dim);
  letter-spacing: 0.1em;
  margin-bottom: 16px;
}

.learn-page .problem-icon {
  font-size: 26px;
  margin-bottom: 12px;
  display: block;
}

.learn-page .problem-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--white);
  margin-bottom: 8px;
}

.learn-page .problem-desc {
  font-size: 13px;
  color: var(--muted);
  line-height: 1.65;
}

.learn-page .problem-solution {
  margin-top: 14px;
  padding-top: 14px;
  border-top: 1px solid var(--border);
  font-size: 12px;
  color: var(--orange);
  font-family: var(--font-mono);
  letter-spacing: 0.02em;
}

/* ────────────────────────────────────────────────────────
   MÓDULO 2 — TÉRMINOS CLAVE
──────────────────────────────────────────────────────── */
.learn-page #terminos { border-bottom: 1px solid var(--border); }

.learn-page .terms-filter {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  margin-bottom: 28px;
}

.learn-page .filter-btn {
  padding: 6px 14px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: transparent;
  color: var(--muted);
  font-size: 12px;
  font-family: var(--font-sans);
  cursor: pointer;
  transition: all 0.2s;
}
.learn-page .filter-btn.active,
.learn-page .filter-btn:hover {
  border-color: var(--orange);
  color: var(--orange);
  background: rgba(247,147,26,0.06);
}

.learn-page .terms-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}

@media (max-width: 800px) {
  .learn-page .terms-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 480px) {
  .learn-page .terms-grid {
    grid-template-columns: 1fr;
  }
}

/* Flip card */
.learn-page .term-card {
  height: 180px;
  perspective: 1000px;
  cursor: pointer;
}

.learn-page .term-inner {
  position: relative;
  width: 100%;
  height: 100%;
  transform-style: preserve-3d;
  transition: transform 0.55s cubic-bezier(0.4, 0, 0.2, 1);
}

.learn-page .term-card.flipped .term-inner { transform: rotateY(180deg); }

.learn-page .term-front,
.learn-page .term-back {
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 18px;
  display: flex;
  flex-direction: column;
}

.learn-page .term-front {
  background: var(--card);
  justify-content: space-between;
}
.learn-page .term-front:hover { border-color: #333; }

.learn-page .term-back {
  background: #0f0f0f;
  border-color: var(--learn-orange-dim);
  transform: rotateY(180deg);
  justify-content: space-between;
}

.learn-page .term-category {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--orange);
  opacity: 0.7;
}

.learn-page .term-name {
  font-family: var(--font-serif);
  font-size: 1.2rem;
  color: var(--white);
  line-height: 1.2;
}

.learn-page .term-hint {
  font-size: 11px;
  color: var(--soft);
  display: flex;
  align-items: center;
  gap: 5px;
}

.learn-page .term-definition {
  font-size: 12.5px;
  color: #aaa;
  line-height: 1.6;
  flex: 1;
}

.learn-page .term-example {
  font-family: var(--font-mono);
  font-size: 10.5px;
  color: var(--orange);
  border-top: 1px solid var(--border);
  padding-top: 10px;
  margin-top: 10px;
  line-height: 1.5;
}

/* ────────────────────────────────────────────────────────
   MÓDULO 3 — CÓMO SE USA
──────────────────────────────────────────────────────── */
.learn-page #como-usar { border-bottom: 1px solid var(--border); }

.learn-page .steps-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  align-items: start;
}

@media (max-width: 700px) {
  .learn-page .steps-layout {
    grid-template-columns: 1fr;
    gap: 24px;
  }
}

.learn-page .steps-list { display: flex; flex-direction: column; gap: 4px; }

.learn-page .step-item {
  display: flex;
  gap: 14px;
  padding: 16px 18px;
  border: 1px solid transparent;
  border-radius: var(--radius);
  cursor: pointer;
  transition: all 0.25s;
  position: relative;
}

.learn-page .step-item.active {
  background: var(--card);
  border-color: var(--border);
}
.learn-page .step-item.active::after {
  content: '';
  position: absolute;
  left: 0; top: 20%; bottom: 20%;
  width: 3px;
  background: var(--orange);
  border-radius: 0 2px 2px 0;
}

.learn-page .step-num-circle {
  width: 30px;
  height: 30px;
  border-radius: 50%;
  background: var(--soft);
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--muted);
  flex-shrink: 0;
  transition: all 0.25s;
}
.learn-page .step-item.active .step-num-circle {
  background: var(--orange);
  border-color: var(--orange);
  color: #000;
}

.learn-page .step-label {
  font-size: 13px;
  font-weight: 500;
  color: var(--muted);
  padding-top: 5px;
  transition: color 0.25s;
}
.learn-page .step-item.active .step-label { color: var(--white); }

.learn-page .step-detail {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  position: sticky;
  top: 24px;
  min-height: 280px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

@media (max-width: 700px) {
  .learn-page .step-detail {
    position: static;
    min-height: auto;
  }
}

.learn-page .step-detail-num {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.2em;
  color: var(--orange);
  margin-bottom: 16px;
}

.learn-page .step-detail-icon { font-size: 32px; margin-bottom: 14px; }

.learn-page .step-detail-title {
  font-family: var(--font-serif);
  font-size: 1.4rem;
  color: var(--white);
  margin-bottom: 10px;
}

.learn-page .step-detail-body {
  font-size: 13.5px;
  color: var(--muted);
  line-height: 1.75;
  flex: 1;
}

.learn-page .step-detail-tip {
  margin-top: 18px;
  padding: 12px 14px;
  background: rgba(247,147,26,0.06);
  border: 1px solid rgba(247,147,26,0.2);
  border-radius: 8px;
  font-size: 12px;
  color: #c87c14;
  line-height: 1.6;
}
.learn-page .step-detail-tip strong { color: var(--orange); }

/* ────────────────────────────────────────────────────────
   MÓDULO 4 — POR QUÉ BITCOIN
──────────────────────────────────────────────────────── */
.learn-page #por-que {
  border-bottom: 1px solid var(--border);
}

.learn-page .why-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2px;
  margin-bottom: 32px;
}

@media (max-width: 600px) {
  .learn-page .why-grid {
    grid-template-columns: 1fr;
  }
}

.learn-page .stat-block {
  background: var(--card);
  padding: 32px 28px;
  position: relative;
  overflow: hidden;
}

.learn-page .stat-block::after {
  content: '';
  position: absolute;
  bottom: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--orange), transparent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.6s ease;
}
.learn-page .stat-block.visible::after { transform: scaleX(1); }

.learn-page .stat-num {
  font-family: var(--font-serif);
  font-size: clamp(2rem, 6vw, 4rem);
  font-weight: 400;
  color: var(--orange);
  line-height: 1;
  margin-bottom: 8px;
}
.learn-page .stat-num .counter { display: inline-block; }

.learn-page .stat-label {
  font-size: 13px;
  color: var(--white);
  font-weight: 500;
  margin-bottom: 6px;
}
.learn-page .stat-source {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--muted);
  letter-spacing: 0.08em;
}

.learn-page .why-pillars {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}

@media (max-width: 800px) {
  .learn-page .why-pillars {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 480px) {
  .learn-page .why-pillars {
    grid-template-columns: 1fr;
  }
}

.learn-page .pillar {
  padding: 22px 20px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: border-color 0.25s;
}
.learn-page .pillar:hover { border-color: var(--orange); }

.learn-page .pillar-icon { font-size: 20px; margin-bottom: 12px; }
.learn-page .pillar-title {
  font-size: 13.5px;
  font-weight: 600;
  color: var(--white);
  margin-bottom: 7px;
}
.learn-page .pillar-text {
  font-size: 12.5px;
  color: var(--muted);
  line-height: 1.65;
}

/* ────────────────────────────────────────────────────────
   MÓDULO 5 — BITCOIN EN MÉXICO
──────────────────────────────────────────────────────── */
.learn-page #mexico { padding-bottom: 80px; }

.learn-page .mx-banner {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px 28px;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 24px;
  align-items: center;
  margin-bottom: 24px;
}

@media (max-width: 600px) {
  .learn-page .mx-banner {
    grid-template-columns: 1fr;
    padding: 24px 20px;
  }
  .learn-page .mx-flag { display: none; }
}

.learn-page .mx-banner-text h3 {
  font-family: var(--font-serif);
  font-size: 1.4rem;
  color: var(--white);
  margin-bottom: 10px;
}
.learn-page .mx-banner-text p {
  font-size: 13.5px;
  color: var(--muted);
  line-height: 1.7;
  max-width: 560px;
}

.learn-page .mx-flag { font-size: 56px; opacity: 0.9; }

.learn-page .mx-facts {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2px;
}

@media (max-width: 800px) {
  .learn-page .mx-facts {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 480px) {
  .learn-page .mx-facts {
    grid-template-columns: 1fr;
  }
}

.learn-page .mx-fact {
  background: var(--card);
  padding: 22px 20px;
  border-left: 3px solid var(--border);
  transition: border-color 0.25s;
}
.learn-page .mx-fact:hover { border-color: var(--orange); }

.learn-page .mx-fact-num {
  font-family: var(--font-serif);
  font-size: 1.8rem;
  color: var(--orange);
  line-height: 1;
  margin-bottom: 6px;
}
.learn-page .mx-fact-label {
  font-size: 12.5px;
  color: var(--muted);
  line-height: 1.5;
}

/* ── CTA ───────────────────────────────────────── */
.learn-page .cta-bar {
  background: var(--orange);
  border-radius: var(--radius);
  padding: 24px 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-top: 40px;
  cursor: pointer;
  transition: opacity 0.2s;
  flex-wrap: wrap;
}
.learn-page .cta-bar:hover { opacity: 0.92; }

.learn-page .cta-bar p {
  font-family: var(--font-serif);
  font-size: clamp(1rem, 3vw, 1.3rem);
  color: #000;
  font-weight: 400;
}
.learn-page .cta-bar p em { font-style: italic; }

.learn-page .cta-arrow {
  width: 40px;
  height: 40px;
  background: rgba(0,0,0,0.12);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  flex-shrink: 0;
  transition: transform 0.2s;
}
.learn-page .cta-bar:hover .cta-arrow { transform: translateX(4px); }

/* ── SCROLL REVEAL ─────────────────────────────────────── */
.learn-page .reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.learn-page .reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

.learn-page .stagger > * {
  transition-delay: calc(var(--i, 0) * 60ms);
}