:root {
    --amber:      #F97316;
    --amber-dark: #EA580C;
    --amber-pale: rgba(249,115,22,0.1);
    --amber-ring: rgba(249,115,22,0.25);
    --black:      #0A0A0A;
    --charcoal:   #1A1A1A;
    --graphite:   #2D2D2D;
    --subtle:     rgba(255,255,255,0.06);
    --white:      #FFFFFF;
    --sidebar:    240px;
    --green:      #4ade80;
    --red:        #f87171;
    --yellow:     #facc15;
  }

  *, *::before, *::after { margin:0; padding:0; box-sizing:border-box; }
  body {
    font-family: 'DM Sans', sans-serif;
    background: var(--black);
    color: var(--white);
    display: flex;
    min-height: 100vh;
  }
  
  .main {
    margin-left: var(--sidebar);
    flex: 1;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
  }
  /* ── CONTENT ─────────────────────────────────────────────────────── */
  .content { padding: 32px; flex: 1; }

  .form-layout {
    display: grid;
    grid-template-columns: 1fr 320px;
    gap: 20px;
    align-items: start;
  }

  /* ── PANELS ──────────────────────────────────────────────────────── */
  .panel {
    background: var(--charcoal);
    border: 1px solid rgba(255,255,255,0.07);
    border-radius: 16px;
    overflow: hidden;
  }
  .panel-header {
    padding: 20px 24px;
    border-bottom: 1px solid rgba(255,255,255,0.07);
    display: flex;
    align-items: center;
    gap: 12px;
  }
  .panel-header-icon {
    width: 34px; height: 34px;
    border-radius: 9px;
    background: var(--amber-pale);
    border: 1px solid rgba(249,115,22,0.2);
    display: flex; align-items: center; justify-content: center;
    font-size: 16px;
    flex-shrink: 0;
  }
  .panel-title {
    font-family: 'Syne', sans-serif;
    font-weight: 700;
    font-size: 15px;
    letter-spacing: -0.3px;
  }
  .panel-subtitle { font-size: 12px; color: rgba(255,255,255,0.4); margin-top: 2px; }
  .panel-body { padding: 24px; }

  /* ── FIELDS ──────────────────────────────────────────────────────── */
  .field { margin-bottom: 20px; }
  .field:last-child { margin-bottom: 0; }

  .field-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
  }

  label {
    display: block;
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 0.5px;
    text-transform: uppercase;
    color: rgba(255,255,255,0.5);
    margin-bottom: 8px;
  }
  .label-optional {
    font-size: 10px;
    font-weight: 500;
    text-transform: none;
    letter-spacing: 0;
    color: rgba(255,255,255,0.25);
    margin-left: 6px;
  }
  .label-required { color: var(--amber); margin-left: 2px; }

  .input-wrap { position: relative; }
  .input-prefix {
    position: absolute;
    left: 14px; top: 50%;
    transform: translateY(-50%);
    font-size: 13px; font-weight: 600;
    color: rgba(255,255,255,0.35);
    pointer-events: none; z-index: 1;
  }

  input[type="text"],
  input[type="number"],
  textarea {
    width: 100%;
    background: var(--graphite);
    border: 1px solid rgba(255,255,255,0.08);
    border-radius: 10px;
    padding: 12px 14px;
    font-family: 'DM Sans', sans-serif;
    font-size: 14px;
    color: var(--white);
    outline: none;
    transition: border-color 0.2s, box-shadow 0.2s, background 0.2s;
    -moz-appearance: textfield;
  }
  input[type="number"]::-webkit-inner-spin-button,
  input[type="number"]::-webkit-outer-spin-button { -webkit-appearance: none; }
  input.has-prefix { padding-left: 50px; }
  input::placeholder,
  textarea::placeholder { color: rgba(255,255,255,0.2); }
  input:hover, textarea:hover { border-color: rgba(255,255,255,0.15); background: #333; }
  input:focus, textarea:focus {
    border-color: var(--amber);
    box-shadow: 0 0 0 3px var(--amber-ring);
    background: var(--graphite);
  }
  input.input-error { border-color: var(--red); }
  input.input-error:focus { box-shadow: 0 0 0 3px rgba(248,113,113,0.2); }

  textarea {
    resize: vertical;
    min-height: 110px;
    line-height: 1.6;
  }

  .field-hint  { font-size: 11px; color: rgba(255,255,255,0.3); margin-top: 6px; line-height: 1.5; }
  .field-error { font-size: 11px; color: var(--red); margin-top: 6px; display: none; }

  /* ── AMOUNT DISPLAY ──────────────────────────────────────────────── */
  .amount-display {
    margin-top: 12px;
    padding: 14px 18px;
    background: linear-gradient(135deg, var(--amber) 0%, var(--amber-dark) 100%);
    border-radius: 12px;
    display: none;
    align-items: center;
    justify-content: space-between;
  }
  .amount-display.visible { display: flex; }
  .amount-display-label {
    font-size: 12px;
    font-weight: 600;
    color: rgba(0,0,0,0.55);
    text-transform: uppercase;
    letter-spacing: 1px;
  }
  .amount-display-value {
    font-family: 'Syne', sans-serif;
    font-weight: 800;
    font-size: 22px;
    color: var(--black);
    letter-spacing: -0.5px;
  }

  /* ── CATEGORY CHIPS ──────────────────────────────────────────────── */
  .category-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 8px;
    margin-top: 12px;
  }

  .cat-card {
    background: var(--graphite);
    border: 1px solid rgba(255,255,255,0.08);
    border-radius: 10px;
    padding: 10px 8px;
    text-align: center;
    cursor: pointer;
    transition: all 0.15s;
    user-select: none;
  }
  .cat-card:hover { border-color: rgba(249,115,22,0.35); background: #333; }
  .cat-card.selected {
    background: var(--amber-pale);
    border-color: var(--amber);
  }
  .cat-card-icon { font-size: 20px; margin-bottom: 4px; }
  .cat-card-label {
    font-size: 11px;
    font-weight: 500;
    color: rgba(255,255,255,0.5);
    line-height: 1.3;
  }
  .cat-card.selected .cat-card-label { color: var(--amber); }

  /* ── SECTION DIVIDER ─────────────────────────────────────────────── */
  .section-divider {
    display: flex;
    align-items: center;
    gap: 12px;
    margin: 20px 0;
  }
  .section-divider-line { flex: 1; height: 1px; background: rgba(255,255,255,0.07); }
  .section-divider-label {
    font-size: 10px;
    font-weight: 600;
    letter-spacing: 3px;
    text-transform: uppercase;
    color: rgba(255,255,255,0.25);
    white-space: nowrap;
  }

  /* ── RIGHT RAIL ──────────────────────────────────────────────────── */
  .summary-row {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    padding: 12px 0;
    border-bottom: 1px solid rgba(255,255,255,0.06);
    font-size: 13px;
    gap: 12px;
  }
  .summary-row:last-of-type { border-bottom: none; }
  .summary-key { color: rgba(255,255,255,0.45); flex-shrink: 0; }
  .summary-val { font-weight: 600; color: var(--white); text-align: right; word-break: break-word; }
  .summary-val.amber { color: var(--amber); }
  .summary-val.dim   { color: rgba(255,255,255,0.22); font-weight: 400; font-style: italic; }

  .submit-block {
    margin-top: 20px;
    display: flex;
    flex-direction: column;
    gap: 10px;
  }
  .submit-btn {
    width: 100%;
    background: var(--amber);
    color: var(--black);
    border: none;
    border-radius: 12px;
    padding: 15px;
    font-family: 'Syne', sans-serif;
    font-size: 16px;
    font-weight: 800;
    cursor: pointer;
    letter-spacing: -0.3px;
    transition: background 0.2s, transform 0.15s;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
  }
  .submit-btn:hover  { background: var(--amber-dark); color: var(--white); }
  .submit-btn:active { transform: scale(0.99); }

  .cancel-btn {
    width: 100%;
    background: transparent;
    color: rgba(255,255,255,0.45);
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: 12px;
    padding: 12px;
    font-family: 'DM Sans', sans-serif;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    text-align: center;
    text-decoration: none;
    display: block;
    transition: all 0.2s;
  }
  .cancel-btn:hover { border-color: rgba(255,255,255,0.25); color: var(--white); }

  /* ── RECENT EXPENSES mini list ───────────────────────────────────── */
  .recent-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 0;
    border-bottom: 1px solid rgba(255,255,255,0.05);
  }
  .recent-item:last-child { border-bottom: none; }
  .recent-dot {
    width: 8px; height: 8px;
    border-radius: 50%;
    flex-shrink: 0;
  }
  .recent-name  { font-size: 13px; flex: 1; }
  .recent-amount{ font-size: 13px; font-weight: 600; color: var(--red); flex-shrink: 0; }
  .recent-cat   { font-size: 11px; color: rgba(255,255,255,0.3); }

  /* ── RESPONSIVE ──────────────────────────────────────────────────── */
  @media (max-width: 960px) {
    .sidebar    { display: none; }
    .main       { margin-left: 0; }
    .form-layout{ grid-template-columns: 1fr; }
    .field-row  { grid-template-columns: 1fr; }
    .category-grid { grid-template-columns: repeat(4, 1fr); }
    .content    { padding: 20px; }
  }

  /* Quick-fill buttons */
  .quick-btn {
    width: 100%;
    text-align: left;
    background: var(--graphite);
    border: 1px solid rgba(255,255,255,0.07);
    border-radius: 9px;
    padding: 10px 14px;
    font-family: 'DM Sans', sans-serif;
    font-size: 13px;
    font-weight: 500;
    color: rgba(255,255,255,0.6);
    cursor: pointer;
    transition: all 0.15s;
  }
  .quick-btn:hover {
    background: rgba(249,115,22,0.1);
    border-color: rgba(249,115,22,0.3);
    color: var(--amber);
  }
  .quick-btn:active { transform: scale(0.98); }