:root {
  --navy: #092544;
  --navy-light: #12395f;
  --gold: #c99519;
  --gold-light: #f1c75b;
  --paper: #ffffff;
  --bg: #f1f4f8;
  --text: #10243c;
  --border: #d5a32c;
  --muted: #65758a;
  --danger: #b42318;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: Tahoma, Arial, sans-serif;
  line-height: 1.8;
}

button, input, textarea {
  font: inherit;
}

button {
  cursor: pointer;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 22px max(20px, calc((100% - 1150px) / 2));
  background: var(--navy);
  color: white;
  border-bottom: 4px solid var(--gold);
}

.topbar h1 {
  margin: 0;
  color: var(--gold-light);
  font-size: clamp(20px, 3vw, 30px);
}

.topbar p {
  margin: 4px 0 0;
  color: #e4eaf2;
}

.container {
  width: min(1150px, calc(100% - 28px));
  margin: 28px auto 60px;
}

.panel {
  background: white;
  border: 1px solid #e1e6ee;
  border-top: 3px solid var(--gold);
  border-radius: 14px;
  padding: clamp(16px, 3vw, 28px);
  margin-bottom: 22px;
  box-shadow: 0 5px 20px rgba(9, 37, 68, .06);
}

.login-panel {
  max-width: 460px;
  margin: 45px auto;
}

h2 {
  color: var(--navy);
  margin-top: 0;
}

.toolbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 14px;
  margin-bottom: 18px;
}

.toolbar h2 {
  margin: 0;
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

label {
  display: block;
  margin-bottom: 6px;
  color: var(--navy);
  font-weight: 700;
}

input, textarea {
  display: block;
  width: 100%;
  padding: 11px 13px;
  border: 1px solid #b9c6d5;
  border-radius: 8px;
  background: #fff;
  color: var(--text);
  outline: none;
}

input:focus, textarea:focus {
  border-color: var(--gold);
  box-shadow: 0 0 0 3px rgba(201, 149, 25, .13);
}

input[readonly] {
  background: #eef2f7;
  font-weight: bold;
}

textarea {
  resize: vertical;
}

small {
  display: block;
  color: var(--muted);
  margin-top: 4px;
}

.full-width {
  grid-column: 1 / -1;
}

.btn {
  border: 1px solid var(--gold);
  border-radius: 8px;
  background: var(--navy);
  color: white;
  padding: 10px 18px;
  font-weight: 700;
}

.btn:hover {
  background: var(--navy-light);
}

.btn.secondary {
  background: white;
  color: var(--navy);
  border-color: #b9c6d5;
}

.btn.whatsapp {
  background: #128c4a;
  border-color: #128c4a;
  color: white;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}

.hidden {
  display: none !important;
}

.error {
  color: var(--danger);
}

.invoice-list {
  display: grid;
  gap: 10px;
  margin-top: 16px;
}

.invoice-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  padding: 14px;
  border: 1px solid #e0e6ed;
  border-right: 4px solid var(--gold);
  border-radius: 8px;
}

.invoice-row h3 {
  margin: 0;
  color: var(--navy);
}

.invoice-row p {
  margin: 3px 0 0;
  color: var(--muted);
}

.row-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.row-actions .btn {
  padding: 6px 11px;
  font-size: 13px;
}

.invoice-paper {
  background: white;
  border: 3px solid var(--gold);
  border-radius: 12px;
  padding: 24px;
  color: var(--navy);
}

.invoice-brand {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
  border-bottom: 3px solid var(--gold);
  padding-bottom: 18px;
  margin-bottom: 20px;
}

.invoice-brand h2 {
  margin: 0;
  color: var(--navy);
  font-size: clamp(20px, 3vw, 30px);
}

.invoice-brand p {
  margin: 5px 0 0;
}

.invoice-mark {
  border: 2px solid var(--gold);
  border-radius: 10px;
  padding: 12px;
  font-weight: bold;
  text-align: center;
  min-width: 110px;
}

.invoice-title {
  text-align: center;
  margin: 18px 0;
  padding: 10px;
  color: white;
  background: var(--navy);
  border: 2px solid var(--gold);
  border-radius: 8px;
  font-size: 25px;
}

.invoice-meta {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  margin-bottom: 18px;
}

.invoice-meta div,
.invoice-section {
  padding: 12px;
  border: 1px solid #dfc16e;
  border-radius: 8px;
  overflow-wrap: anywhere;
}

.invoice-section {
  margin: 12px 0;
}

.invoice-section h3 {
  margin: -12px -12px 12px;
  padding: 8px 12px;
  color: white;
  background: var(--navy);
  border-radius: 7px 7px 0 0;
  font-size: 16px;
}

.invoice-line {
  padding: 8px 0;
  border-bottom: 1px solid #d7dee8;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}

.invoice-line:last-child {
  border-bottom: 0;
}

.invoice-footer {
  margin-top: 22px;
  padding: 14px;
  text-align: center;
  color: white;
  background: var(--navy);
  border-top: 3px solid var(--gold);
  border-radius: 8px;
}

.invoice-footer strong {
  color: var(--gold-light);
}

#formMessage {
  color: #18794e;
  font-weight: bold;
}

@media (max-width: 650px) {
  .topbar {
    align-items: flex-start;
    padding: 16px;
  }

  .container {
    width: calc(100% - 20px);
    margin-top: 16px;
  }

  .form-grid,
  .invoice-meta {
    grid-template-columns: 1fr;
  }

  .toolbar {
    align-items: flex-start;
    flex-wrap: wrap;
  }

  .actions .btn {
    width: 100%;
  }

  .invoice-paper {
    padding: 12px;
  }

  .invoice-brand {
    align-items: flex-start;
  }

  .invoice-mark {
    min-width: 80px;
  }
}

@page {
  size: A4;
  margin: 12mm;
}

@media print {
  body {
    background: white;
  }

  body * {
    visibility: hidden !important;
  }

  #previewPanel,
  #previewPanel * {
    visibility: visible !important;
  }

  #previewPanel {
    display: block !important;
    position: absolute;
    inset: 0;
    width: 100%;
    margin: 0;
    padding: 0;
    border: 0;
    box-shadow: none;
  }

  #invoicePreview {
    position: relative;
    width: 100%;
    padding: 8px;
    border: 2px solid var(--gold);
    border-radius: 0;
    print-color-adjust: exact;
    -webkit-print-color-adjust: exact;
  }

  .no-print {
    display: none !important;
  }

  .invoice-section,
  .invoice-meta,
  .invoice-brand {
    break-inside: avoid;
  }
}

.back-home-container {
    display: flex;
    justify-content: flex-start;
    margin: 20px 0;
}

.back-home-btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 12px 20px;
    background-color: #0b2545;
    color: #ffffff;
    border: 2px solid #dca51c;
    border-radius: 8px;
    text-decoration: none;
    font-size: 16px;
    font-weight: bold;
    transition: 0.3s ease;
}

.back-home-btn:hover {
    background-color: #dca51c;
    color: #0b2545;
    transform: translateY(-2px);
}

.back-home-btn span {
    font-size: 20px;
}



/* ================================
   MOBILE RESPONSIVE - INVOICES
================================ */

@media (max-width: 768px) {

    * {
        box-sizing: border-box;
    }

    body {
        margin: 0;
        width: 100%;
        overflow-x: hidden;
    }

    /* الهيدر */
    header {
        padding: 18px 12px !important;
    }

    header h1 {
        font-size: 23px !important;
        line-height: 1.5;
        margin-bottom: 8px;
    }

    header p {
        font-size: 13px !important;
        line-height: 1.8;
    }

    /* زر العودة للرئيسية */
    .back-home-container {
        display: flex;
        justify-content: center;
        width: 100%;
        margin: 14px 0 0;
    }

    .back-home-btn {
        display: inline-flex;
        justify-content: center;
        align-items: center;
        gap: 7px;
        width: auto;
        max-width: 100%;
        padding: 10px 14px;
        font-size: 13px;
        line-height: 1.6;
        white-space: normal;
        text-align: center;
        border-radius: 8px;
        transform: none;
    }

    /* المحتوى الرئيسي */
    main,
    .container,
    .invoice-container {
        width: 100%;
        max-width: 100%;
        padding-right: 12px;
        padding-left: 12px;
    }

    /* بطاقات المحتوى */
    .login-card,
    .login-box,
    .card {
        width: 100%;
        max-width: 100%;
        margin: 24px auto;
        padding: 22px 16px;
        border-radius: 14px;
    }

    /* العناوين */
    h2 {
        font-size: 22px;
        line-height: 1.5;
    }

    /* الحقول */
    input,
    select,
    textarea {
        width: 100%;
        max-width: 100%;
        min-width: 0;
        font-size: 16px;
    }

    /* الأزرار */
    button {
        max-width: 100%;
    }

}

/* الهواتف الصغيرة */
@media (max-width: 380px) {

    header h1 {
        font-size: 20px !important;
    }

    .back-home-btn {
        padding: 9px 11px;
        font-size: 12px;
    }

    .login-card,
    .login-box,
    .card {
        padding: 18px 12px;
    }

}