/* ===== CSS Variables ===== */
:root {
    --primary-color: #1e3a5f;
    --secondary-color: #2c5282;
    --accent-color: #4a90e2;
    --text-dark: #1a202c;
    --text-light: #4a5568;
    --border-color: #cbd5e0;
    --bg-light: #f7fafc;
    --bg-white: #ffffff;
    --success-color: #48bb78;
    --danger-color: #f56565;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
}

/* ===== Global Styles ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 2rem 1rem;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    background: var(--bg-white);
    border-radius: 12px;
    box-shadow: var(--shadow-lg);
    overflow: hidden;
}

/* ===== Header ===== */
header {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
    padding: 2rem;
    text-align: center;
}

header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.2);
}

.subtitle {
    font-size: 1.1rem;
    opacity: 0.9;
    font-weight: 300;
}

/* ===== Navigation Tabs ===== */
.document-tabs {
    display: flex;
    background: var(--bg-light);
    border-bottom: 2px solid var(--border-color);
    overflow-x: auto;
}

.tab-btn {
    flex: 1;
    padding: 1rem 1.5rem;
    background: transparent;
    border: none;
    color: var(--text-light);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    border-bottom: 3px solid transparent;
    white-space: nowrap;
}

.tab-btn:hover {
    background: rgba(74, 144, 226, 0.1);
    color: var(--accent-color);
}

.tab-btn.active {
    background: var(--bg-white);
    color: var(--primary-color);
    border-bottom-color: var(--accent-color);
}

/* ===== Main Content ===== */
.main-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    padding: 2rem;
}

@media (max-width: 1024px) {
    .main-content {
        grid-template-columns: 1fr;
    }
}

/* ===== Form Section ===== */
.form-section {
    background: var(--bg-white);
}

.form-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
    border-bottom: 2px solid var(--border-color);
}

.form-header h2 {
    color: var(--primary-color);
    font-size: 1.8rem;
}

.form-actions {
    display: flex;
    gap: 0.5rem;
}

/* ===== Form Styles ===== */
.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-dark);
    font-weight: 600;
    font-size: 0.95rem;
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 0.75rem;
    border: 2px solid var(--border-color);
    border-radius: 6px;
    font-size: 1rem;
    font-family: inherit;
    transition: all 0.3s ease;
    background: var(--bg-white);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(74, 144, 226, 0.1);
}

.form-group textarea {
    min-height: 100px;
    resize: vertical;
}

.form-group small {
    display: block;
    margin-top: 0.25rem;
    color: var(--text-light);
    font-size: 0.85rem;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

@media (max-width: 768px) {
    .form-row {
        grid-template-columns: 1fr;
    }
}

/* ===== Buttons ===== */
.btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 6px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent-color) 0%, var(--secondary-color) 100%);
    color: white;
    box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background: var(--bg-light);
    color: var(--text-dark);
    border: 2px solid var(--border-color);
}

.btn-secondary:hover {
    background: var(--border-color);
}

/* ===== Preview Section ===== */
.preview-section {
    background: var(--bg-light);
    border-radius: 8px;
    padding: 1.5rem;
    height: fit-content;
    position: sticky;
    top: 2rem;
}

.preview-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
    border-bottom: 2px solid var(--border-color);
}

.preview-header h2 {
    color: var(--primary-color);
    font-size: 1.5rem;
}

.preview-actions {
    display: flex;
    gap: 0.5rem;
}

.document-preview {
    background: var(--bg-white);
    padding: 2rem;
    border-radius: 6px;
    min-height: 400px;
    box-shadow: var(--shadow-sm);
    font-family: 'Times New Roman', Times, serif;
    line-height: 1.8;
}

.preview-placeholder {
    color: var(--text-light);
    text-align: center;
    padding: 3rem 1rem;
    font-style: italic;
}

/* ===== Document Preview Styles ===== */
.document-preview h1 {
    text-align: center;
    color: var(--primary-color);
    font-size: 1.8rem;
    margin-bottom: 2rem;
    text-transform: uppercase;
    border-bottom: 3px solid var(--primary-color);
    padding-bottom: 0.5rem;
}

.document-preview h2 {
    color: var(--secondary-color);
    font-size: 1.3rem;
    margin-top: 2rem;
    margin-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.3rem;
}

.document-preview h3 {
    color: var(--text-dark);
    font-size: 1.1rem;
    margin-top: 1.5rem;
    margin-bottom: 0.5rem;
}

.document-preview p {
    margin-bottom: 1rem;
    text-align: justify;
}

.document-preview ul,
.document-preview ol {
    margin-left: 2rem;
    margin-bottom: 1rem;
}

.document-preview li {
    margin-bottom: 0.5rem;
}

.doc-section {
    margin-bottom: 2rem;
}

.signature-block {
    margin-top: 3rem;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
}

.signature-line {
    border-top: 2px solid var(--text-dark);
    padding-top: 0.5rem;
    margin-top: 3rem;
}

.signature-line p {
    margin: 0.25rem 0;
    font-size: 0.9rem;
}

/* ===== Print Styles ===== */
@media print {
    body {
        background: white;
        padding: 0;
    }

    .container {
        box-shadow: none;
        max-width: 100%;
    }

    header,
    .document-tabs,
    .form-section,
    .preview-header,
    .btn {
        display: none !important;
    }

    .main-content {
        display: block;
        padding: 0;
    }

    .preview-section {
        position: static;
        background: white;
        padding: 0;
    }

    .document-preview {
        box-shadow: none;
        padding: 1rem;
        font-size: 12pt;
    }
}

/* ===== Animations ===== */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

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

.form-group {
    animation: fadeIn 0.3s ease;
}

/* ===== Success/Error Messages ===== */
.message {
    padding: 1rem;
    border-radius: 6px;
    margin-bottom: 1rem;
    font-weight: 600;
    animation: fadeIn 0.3s ease;
}

.message.success {
    background: rgba(72, 187, 120, 0.1);
    color: var(--success-color);
    border: 2px solid var(--success-color);
}

.message.error {
    background: rgba(245, 101, 101, 0.1);
    color: var(--danger-color);
    border: 2px solid var(--danger-color);
}

/* ===== Login Modal ===== */
.login-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    z-index: 9999;
    display: flex;
    justify-content: center;
    align-items: center;
    backdrop-filter: blur(5px);
}

.login-modal.hidden {
    display: none;
}

.login-container {
    background: var(--bg-white);
    padding: 2.5rem;
    border-radius: 12px;
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    width: 100%;
    max-width: 400px;
    animation: fadeIn 0.5s ease-out;
}

.login-header {
    text-align: center;
    margin-bottom: 2rem;
}

.login-header h2 {
    color: var(--primary-color);
    font-size: 1.8rem;
    margin-bottom: 0.5rem;
}

.login-header p {
    color: var(--text-light);
}

.login-error {
    color: var(--danger-color);
    text-align: center;
    margin-top: 1rem;
    font-size: 0.9rem;
    min-height: 1.2em;
}