:root {
    --bg: #0c0e14;
    --surface: #13161f;
    --surface2: #1a1e2a;
    --border: #252a38;
    --accent: #f0c040;
    --accent2: #e07c3c;
    --text: #e8eaf0;
    --text2: #8890a8;
    --text3: #555d72;
    --success: #3ecf8e;
    --danger: #e05c5c;
    --radius: 12px;
    --shadow: 0 8px 32px rgba(0,0,0,0.4);
  }
  * { box-sizing: border-box; margin: 0; padding: 0; }
  body { font-family: 'DM Sans', sans-serif; background: var(--bg); color: var(--text); min-height: 100vh; overflow-x: hidden; }

  body::before {
    content: ''; position: fixed; top: -50%; left: -50%; width: 200%; height: 200%;
    background: radial-gradient(ellipse 60% 40% at 70% 20%, rgba(240,192,64,0.05) 0%, transparent 60%),
                radial-gradient(ellipse 40% 60% at 20% 80%, rgba(224,124,60,0.05) 0%, transparent 60%);
    pointer-events: none; z-index: 0;
    animation: bgPulse 8s ease-in-out infinite alternate;
  }
  @keyframes bgPulse { from { opacity: 0.6; } to { opacity: 1; } }

  /* ── AUTH SCREENS ── */
  #auth-screen {
    position: fixed; inset: 0; z-index: 200;
    display: flex; align-items: center; justify-content: center;
    background: var(--bg);
    animation: fadeIn 0.4s ease;
  }
  @keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
  @keyframes fadeUp { from { opacity: 0; transform: translateY(20px); } to { opacity: 1; transform: translateY(0); } }
  @keyframes slideIn { from { opacity: 0; transform: translateX(-10px); } to { opacity: 1; transform: translateX(0); } }

  .auth-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 20px;
    width: 100%;
    max-width: 440px;
    padding: 48px 44px;
    position: relative;
    z-index: 1;
    animation: fadeUp 0.5s ease;
    box-shadow: 0 32px 80px rgba(0,0,0,0.6);
  }

  .auth-logo {
    font-family: 'Playfair Display', serif;
    font-size: 1.6rem; font-weight: 900;
    background: linear-gradient(135deg, var(--accent), var(--accent2));
    -webkit-background-clip: text; -webkit-text-fill-color: transparent;
    margin-bottom: 8px;
  }

  .auth-subtitle { color: var(--text2); font-size: 0.9rem; margin-bottom: 36px; }

  .auth-tabs {
    display: flex; background: var(--surface2); border-radius: 10px;
    padding: 4px; margin-bottom: 28px;
  }

  .auth-tab {
    flex: 1; padding: 9px 16px; border: none; border-radius: 8px;
    background: transparent; color: var(--text2);
    font-family: 'DM Sans', sans-serif; font-size: 0.875rem; font-weight: 500;
    cursor: pointer; transition: all 0.2s;
  }
  .auth-tab.active { background: var(--surface); color: var(--text); box-shadow: 0 1px 6px rgba(0,0,0,0.4); }

  .auth-form { display: flex; flex-direction: column; gap: 14px; }

  .auth-label { font-size: 0.75rem; font-weight: 500; color: var(--text2); letter-spacing: 0.3px; margin-bottom: 5px; display: block; }

  .auth-input {
    width: 100%; background: var(--surface2); border: 1px solid var(--border);
    color: var(--text); border-radius: 10px; padding: 12px 16px;
    font-family: 'DM Sans', sans-serif; font-size: 0.9rem; outline: none;
    transition: all 0.2s;
  }
  .auth-input:focus { border-color: var(--accent); background: rgba(240,192,64,0.04); box-shadow: 0 0 0 3px rgba(240,192,64,0.1); }
  .auth-input::placeholder { color: var(--text3); }

  .auth-btn {
    width: 100%; padding: 13px;
    background: linear-gradient(135deg, var(--accent), var(--accent2));
    color: #0c0e14; font-family: 'DM Sans', sans-serif;
    font-size: 0.95rem; font-weight: 700;
    border: none; border-radius: 10px; cursor: pointer;
    transition: all 0.2s; margin-top: 6px;
    letter-spacing: 0.3px;
  }
  .auth-btn:hover { opacity: 0.9; transform: translateY(-1px); box-shadow: 0 6px 24px rgba(240,192,64,0.35); }
  .auth-btn:active { transform: translateY(0); }

  .auth-divider {
    display: flex; align-items: center; gap: 12px;
    color: var(--text3); font-size: 0.8rem; margin: 4px 0;
  }
  .auth-divider::before, .auth-divider::after { content: ''; flex: 1; height: 1px; background: var(--border); }

  .auth-social {
    display: flex; gap: 10px;
  }

  .social-btn {
    flex: 1; padding: 10px;
    background: var(--surface2); border: 1px solid var(--border);
    color: var(--text2); border-radius: 10px; cursor: pointer;
    font-family: 'DM Sans', sans-serif; font-size: 0.8rem; font-weight: 500;
    transition: all 0.2s; display: flex; align-items: center; justify-content: center; gap: 6px;
  }
  .social-btn:hover { background: var(--surface); color: var(--text); border-color: var(--text3); }

  .auth-error {
    background: rgba(224,92,92,0.12); border: 1px solid rgba(224,92,92,0.3);
    color: var(--danger); font-size: 0.8rem; padding: 10px 14px;
    border-radius: 8px; display: none;
  }
  .auth-error.show { display: block; }

  .auth-success {
    background: rgba(62,207,142,0.12); border: 1px solid rgba(62,207,142,0.3);
    color: var(--success); font-size: 0.8rem; padding: 10px 14px;
    border-radius: 8px; display: none;
  }
  .auth-success.show { display: block; }

  .password-wrap { position: relative; }
  .password-wrap .auth-input { padding-right: 44px; }
  .eye-btn {
    position: absolute; right: 12px; top: 50%; transform: translateY(-50%);
    background: none; border: none; cursor: pointer; color: var(--text3);
    font-size: 1rem; line-height: 1; padding: 4px;
    transition: color 0.2s;
  }
  .eye-btn:hover { color: var(--text2); }

  .auth-footer { text-align: center; color: var(--text3); font-size: 0.78rem; margin-top: 20px; }
  .auth-footer a { color: var(--accent); text-decoration: none; }

  .strength-bar { height: 3px; border-radius: 2px; background: var(--border); margin-top: 6px; overflow: hidden; }
  .strength-fill { height: 100%; border-radius: 2px; width: 0%; transition: all 0.3s; }

  /* ── NAV ── */
  nav {
    position: sticky; top: 0; z-index: 100;
    display: flex; align-items: center; justify-content: space-between;
    padding: 0 40px; height: 64px;
    background: rgba(12,14,20,0.85);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
  }
  .logo {
    font-family: 'Playfair Display', serif;
    font-size: 1.4rem; font-weight: 900;
    background: linear-gradient(135deg, var(--accent), var(--accent2));
    -webkit-background-clip: text; -webkit-text-fill-color: transparent;
    letter-spacing: -0.5px;
  }
  .logo span { font-weight: 400; }
  .nav-right { display: flex; gap: 10px; align-items: center; }

  .user-pill {
    display: flex; align-items: center; gap: 8px;
    background: var(--surface2); border: 1px solid var(--border);
    border-radius: 20px; padding: 5px 14px 5px 6px;
    font-size: 0.8rem; color: var(--text2); cursor: pointer;
    transition: all 0.2s; position: relative;
  }
  .user-pill:hover { border-color: var(--text3); color: var(--text); }
  .user-avatar {
    width: 26px; height: 26px; border-radius: 50%;
    background: linear-gradient(135deg, var(--accent), var(--accent2));
    display: flex; align-items: center; justify-content: center;
    font-size: 0.7rem; font-weight: 700; color: #0c0e14;
  }

  .user-dropdown {
    position: absolute; top: calc(100% + 8px); right: 0;
    background: var(--surface); border: 1px solid var(--border);
    border-radius: 12px; padding: 6px; min-width: 180px;
    box-shadow: 0 8px 32px rgba(0,0,0,0.5); display: none; z-index: 200;
  }
  .user-dropdown.open { display: block; animation: fadeUp 0.15s ease; }

  .dd-item {
    padding: 9px 14px; border-radius: 8px; font-size: 0.83rem;
    color: var(--text2); cursor: pointer; transition: all 0.15s;
    display: flex; align-items: center; gap: 8px;
  }
  .dd-item:hover { background: var(--surface2); color: var(--text); }
  .dd-item.danger { color: var(--danger); }
  .dd-item.danger:hover { background: rgba(224,92,92,0.1); }
  .dd-sep { height: 1px; background: var(--border); margin: 4px 0; }

  .btn {
    display: inline-flex; align-items: center; gap: 8px;
    padding: 8px 20px; border-radius: 8px; border: none;
    font-family: 'DM Sans', sans-serif; font-size: 0.875rem; font-weight: 500;
    cursor: pointer; transition: all 0.2s;
  }
  .btn-ghost { background: transparent; color: var(--text2); border: 1px solid var(--border); }
  .btn-ghost:hover { background: var(--surface2); color: var(--text); border-color: var(--text3); }
  .btn-primary { background: linear-gradient(135deg, var(--accent), var(--accent2)); color: #0c0e14; font-weight: 600; }
  .btn-primary:hover { opacity: 0.9; transform: translateY(-1px); box-shadow: 0 4px 20px rgba(240,192,64,0.3); }
  .btn-danger { background: rgba(224,92,92,0.15); color: var(--danger); border: 1px solid rgba(224,92,92,0.3); }
  .btn-danger:hover { background: rgba(224,92,92,0.25); }
  .btn-success { background: rgba(62,207,142,0.15); color: var(--success); border: 1px solid rgba(62,207,142,0.3); }
  .btn-success:hover { background: rgba(62,207,142,0.25); }
  .btn-sm { padding: 5px 14px; font-size: 0.8rem; }

  /* ── LAYOUT ── */
  .container { max-width: 1400px; margin: 0 auto; padding: 0 40px; position: relative; z-index: 1; }
  .main { display: grid; grid-template-columns: 1fr 1fr; gap: 32px; padding: 32px 0 60px; }

  .panel { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; animation: fadeUp 0.5s ease both; }
  .panel:nth-child(2) { animation-delay: 0.1s; }
  .panel-header { padding: 20px 28px; border-bottom: 1px solid var(--border); display: flex; align-items: center; justify-content: space-between; background: var(--surface2); }
  .panel-title { font-family: 'Playfair Display', serif; font-size: 1.1rem; font-weight: 700; letter-spacing: -0.3px; }
  .panel-body { padding: 28px; }

  .section-label { font-size: 0.7rem; font-weight: 600; letter-spacing: 2px; text-transform: uppercase; color: var(--accent); margin-bottom: 14px; display: flex; align-items: center; gap: 8px; }
  .section-label::after { content: ''; flex: 1; height: 1px; background: linear-gradient(90deg, var(--border), transparent); }

  .form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin-bottom: 24px; }
  .form-grid.cols-1 { grid-template-columns: 1fr; }
  .form-grid.cols-3 { grid-template-columns: 1fr 1fr 1fr; }
  .form-group { display: flex; flex-direction: column; gap: 6px; }
  .form-group.full { grid-column: 1 / -1; }

  label { font-size: 0.75rem; font-weight: 500; color: var(--text2); letter-spacing: 0.3px; }

  input, textarea, select {
    background: var(--surface2); border: 1px solid var(--border);
    color: var(--text); border-radius: 8px; padding: 10px 14px;
    font-family: 'DM Sans', sans-serif; font-size: 0.875rem;
    transition: all 0.2s; width: 100%; outline: none; -webkit-appearance: none;
  }
  input:focus, textarea:focus, select:focus { border-color: var(--accent); background: rgba(240,192,64,0.05); box-shadow: 0 0 0 3px rgba(240,192,64,0.1); }
  input::placeholder, textarea::placeholder { color: var(--text3); }
  textarea { resize: vertical; min-height: 72px; }
  select option { background: var(--surface2); }

  .items-header { display: grid; grid-template-columns: 2.5fr 0.8fr 1fr 1fr 40px; gap: 8px; padding: 8px 12px; font-size: 0.7rem; font-weight: 600; letter-spacing: 1.5px; text-transform: uppercase; color: var(--text3); border-bottom: 1px solid var(--border); }
  .item-row { display: grid; grid-template-columns: 2.5fr 0.8fr 1fr 1fr 40px; gap: 8px; padding: 8px 12px; align-items: center; border-bottom: 1px solid rgba(37,42,56,0.5); animation: slideIn 0.25s ease both; }
  .item-row input { background: transparent; border: 1px solid transparent; padding: 7px 10px; }
  .item-row input:focus { background: var(--surface2); border-color: var(--border); }
  .item-total { font-family: 'DM Mono', monospace; font-size: 0.85rem; color: var(--text2); text-align: right; padding-right: 6px; }
  .remove-btn { background: none; border: none; cursor: pointer; color: var(--text3); font-size: 1.1rem; padding: 4px; border-radius: 6px; transition: all 0.15s; display: flex; align-items: center; justify-content: center; }
  .remove-btn:hover { color: var(--danger); background: rgba(224,92,92,0.1); }
  .add-item-row { padding: 12px 12px; border-bottom: 1px solid var(--border); }

  .totals-box { background: var(--surface2); border-radius: 10px; padding: 20px; margin-top: 24px; }
  .totals-row { display: flex; justify-content: space-between; align-items: center; padding: 6px 0; font-size: 0.875rem; color: var(--text2); }
  .totals-row.grand { border-top: 1px solid var(--border); margin-top: 8px; padding-top: 14px; font-size: 1.1rem; font-weight: 700; color: var(--text); }
  .totals-row.grand .amount { font-family: 'Playfair Display', serif; font-size: 1.5rem; background: linear-gradient(135deg, var(--accent), var(--accent2)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
  .mono { font-family: 'DM Mono', monospace; }

  #preview-wrapper { position: sticky; top: 96px; max-height: calc(100vh - 130px); overflow-y: auto; scrollbar-width: thin; scrollbar-color: var(--border) transparent; }

  #invoice-preview { background: #fff; border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow); font-family: 'DM Sans', sans-serif; color: #1a1a2e; min-height: 600px; }

  /* Invoice preview */
  .inv-header { padding: 40px 48px 32px; background: linear-gradient(135deg, #0f1322 0%, #1a2040 100%); display: flex; justify-content: space-between; align-items: flex-start; }
  .inv-logo-area .inv-company { font-size: 1.6rem; font-weight: 800; color: #fff; letter-spacing: -0.5px; line-height: 1; font-family: 'Playfair Display', serif; }
  .inv-logo-area .inv-tagline { font-size: 0.75rem; color: rgba(255,255,255,0.4); margin-top: 4px; letter-spacing: 1px; }
  .inv-badge-area { text-align: right; }
  .inv-word { font-family: 'Playfair Display', serif; font-size: 2.8rem; font-weight: 900; line-height: 1; background: linear-gradient(135deg, #f0c040, #e07c3c); -webkit-background-clip: text; -webkit-text-fill-color: transparent; letter-spacing: -1px; }
  .inv-number { font-family: 'DM Mono', monospace; font-size: 0.8rem; color: rgba(255,255,255,0.5); margin-top: 4px; }
  .inv-meta { background: #f8f9fc; padding: 20px 48px; display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; border-bottom: 1px solid #e8ecf5; }
  .inv-meta-item .meta-label { font-size: 0.65rem; font-weight: 700; letter-spacing: 1.5px; text-transform: uppercase; color: #8891aa; margin-bottom: 4px; }
  .inv-meta-item .meta-value { font-size: 0.875rem; font-weight: 600; color: #1a1a2e; font-family: 'DM Mono', monospace; }
  .inv-parties { padding: 28px 48px; display: grid; grid-template-columns: 1fr 1fr; gap: 32px; border-bottom: 1px solid #e8ecf5; }
  .party-label { font-size: 0.65rem; font-weight: 700; letter-spacing: 2px; text-transform: uppercase; margin-bottom: 10px; }
  .from-label { color: #f0c040; } .to-label { color: #3ecf8e; }
  .party-name { font-size: 1rem; font-weight: 700; color: #0f1322; margin-bottom: 4px; }
  .party-details { font-size: 0.8rem; color: #6e7a94; line-height: 1.6; }
  .inv-items { padding: 28px 48px; }
  .inv-items-head { display: grid; grid-template-columns: 2.5fr 0.8fr 1.1fr 1.1fr; gap: 8px; padding: 8px 12px; background: #f0f3fb; border-radius: 8px; margin-bottom: 6px; font-size: 0.65rem; font-weight: 700; letter-spacing: 1.5px; text-transform: uppercase; color: #8891aa; }
  .inv-item-row { display: grid; grid-template-columns: 2.5fr 0.8fr 1.1fr 1.1fr; gap: 8px; padding: 10px 12px; border-bottom: 1px solid #f0f3fb; font-size: 0.85rem; }
  .inv-item-row:last-child { border-bottom: none; }
  .inv-item-desc { color: #1a1a2e; font-weight: 500; } .inv-item-qty, .inv-item-rate { color: #6e7a94; font-family: 'DM Mono', monospace; } .inv-item-amt { font-weight: 600; color: #0f1322; text-align: right; font-family: 'DM Mono', monospace; }
  .inv-totals { padding: 0 48px 28px; display: flex; justify-content: flex-end; }
  .inv-totals-box { width: 280px; }
  .inv-totals-row { display: flex; justify-content: space-between; padding: 5px 0; font-size: 0.83rem; color: #6e7a94; }
  .inv-totals-row .val { font-family: 'DM Mono', monospace; color: #1a1a2e; }
  .inv-grand { border-top: 2px solid #0f1322; margin-top: 8px; padding-top: 12px; display: flex; justify-content: space-between; align-items: baseline; font-weight: 700; color: #0f1322; }
  .inv-grand-amt { font-family: 'Playfair Display', serif; font-size: 1.6rem; background: linear-gradient(135deg, #c49020, #b05020); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
  .inv-notes { margin: 0 48px; padding: 16px 20px; background: #f8f9fc; border-radius: 8px; font-size: 0.8rem; color: #6e7a94; border-left: 3px solid #f0c040; margin-bottom: 28px; }
  .inv-footer { padding: 20px 48px; background: #f0f3fb; display: flex; justify-content: space-between; align-items: center; border-top: 1px solid #e8ecf5; }
  .inv-footer-txt { font-size: 0.75rem; color: #8891aa; }
  .inv-footer-status { display: inline-flex; align-items: center; gap: 6px; padding: 5px 14px; border-radius: 20px; font-size: 0.7rem; font-weight: 700; letter-spacing: 0.5px; }
  .inv-status-paid { background: rgba(62,207,142,0.15); color: #3ecf8e; border: 1px solid rgba(62,207,142,0.4); }
  .inv-status-pending { background: rgba(240,192,64,0.15); color: #b08010; border: 1px solid rgba(240,192,64,0.4); }
  .inv-status-overdue { background: rgba(224,92,92,0.15); color: #c04040; border: 1px solid rgba(224,92,92,0.4); }

  /* ── HERO ── */
  .hero { padding: 48px 0 0; text-align: center; }
  .hero-label { display: inline-flex; align-items: center; gap: 8px; background: rgba(240,192,64,0.1); border: 1px solid rgba(240,192,64,0.3); color: var(--accent); padding: 5px 16px; border-radius: 20px; font-size: 0.75rem; font-weight: 600; letter-spacing: 1px; text-transform: uppercase; margin-bottom: 16px; }
  .hero h1 { font-family: 'Playfair Display', serif; font-size: clamp(2rem, 4vw, 3rem); font-weight: 900; letter-spacing: -1.5px; line-height: 1.1; margin-bottom: 12px; }
  .hero h1 em { font-style: normal; background: linear-gradient(135deg, var(--accent), var(--accent2)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
  .hero p { color: var(--text2); font-size: 1rem; max-width: 500px; margin: 0 auto 28px; }

  .tabs { display: flex; gap: 2px; padding: 6px; background: var(--surface2); border-radius: 10px; margin-bottom: 20px; }
  .tab { flex: 1; padding: 8px 16px; border: none; border-radius: 8px; background: transparent; color: var(--text2); font-family: 'DM Sans', sans-serif; font-size: 0.8rem; font-weight: 500; cursor: pointer; transition: all 0.2s; }
  .tab.active { background: var(--surface); color: var(--text); box-shadow: 0 1px 4px rgba(0,0,0,0.3); }

  #toast { position: fixed; bottom: 30px; left: 50%; transform: translateX(-50%) translateY(80px); background: var(--surface2); border: 1px solid var(--border); border-radius: 10px; padding: 12px 24px; font-size: 0.875rem; color: var(--text); display: flex; align-items: center; gap: 10px; box-shadow: 0 8px 32px rgba(0,0,0,0.5); transition: transform 0.4s cubic-bezier(0.34,1.56,0.64,1); z-index: 999; }
  #toast.show { transform: translateX(-50%) translateY(0); }

  ::-webkit-scrollbar { width: 6px; height: 6px; }
  ::-webkit-scrollbar-track { background: transparent; }
  ::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }

  /* ── SAVED INVOICES ── */
  .saved-badge {
    background: rgba(62,207,142,0.12); border: 1px solid rgba(62,207,142,0.25);
    color: var(--success); font-size: 0.7rem; font-weight: 600;
    padding: 2px 8px; border-radius: 10px;
  }

  /* ── PROFILE SECTION ── */
  .profile-header {
    display: flex; align-items: center; gap: 16px;
    padding: 20px 28px; background: var(--surface2);
    border-bottom: 1px solid var(--border);
  }
  .profile-avatar {
    width: 48px; height: 48px; border-radius: 50%;
    background: linear-gradient(135deg, var(--accent), var(--accent2));
    display: flex; align-items: center; justify-content: center;
    font-size: 1.1rem; font-weight: 700; color: #0c0e14;
    flex-shrink: 0;
  }
  .profile-name { font-weight: 600; font-size: 0.95rem; }
  .profile-email { font-size: 0.78rem; color: var(--text2); margin-top: 2px; }

  @media (max-width: 900px) {
    .main { grid-template-columns: 1fr; }
    #preview-wrapper { position: static; max-height: none; }
    .container { padding: 0 16px; }
    nav { padding: 0 16px; }
  }