/* ===== CSS VARIABLES & RESET ===== */
:root {
    --bg-primary: #0a0f1c;
    --bg-secondary: #111827;
    --bg-card: #1a2234;
    --bg-card-hover: #1f2a3f;
    --bg-input: #0d1424;
    --border-color: #2a3550;
    --border-focus: #22c55e;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --accent-green: #22c55e;
    --accent-green-hover: #16a34a;
    --accent-green-glow: rgba(34, 197, 94, 0.2);
    --accent-blue: #3b82f6;
    --accent-blue-hover: #2563eb;
    --accent-purple: #8b5cf6;
    --accent-orange: #f59e0b;
    --accent-red: #ef4444;
    --accent-red-hover: #dc2626;
    --gradient-green: linear-gradient(135deg, #22c55e, #16a34a);
    --gradient-blue: linear-gradient(135deg, #3b82f6, #2563eb);
    --gradient-card: linear-gradient(135deg, rgba(34, 197, 94, 0.05), rgba(59, 130, 246, 0.05));
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 30px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 20px rgba(34, 197, 94, 0.15);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 20px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    overflow-x: hidden;
}

body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(ellipse at 20% 20%, rgba(34, 197, 94, 0.06) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 80%, rgba(59, 130, 246, 0.06) 0%, transparent 50%);
    pointer-events: none;
    z-index: 0;
}

/* ===== SCROLLBAR ===== */
::-webkit-scrollbar {
    width: 6px;
}
::-webkit-scrollbar-track {
    background: var(--bg-secondary);
}
::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

/* ===== HEADER ===== */
.app-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(17, 24, 39, 0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
}

.header-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 12px 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

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

.logo-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    filter: drop-shadow(0 0 8px rgba(34, 197, 94, 0.3));
}

.logo-text h1 {
    font-size: 1.4rem;
    font-weight: 800;
    background: var(--gradient-green);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.5px;
}

.logo-text span {
    font-size: 0.75rem;
    color: var(--text-muted);
    font-weight: 500;
    letter-spacing: 0.5px;
    text-transform: uppercase;
}

.btn-icon {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    width: 40px;
    height: 40px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
}

.btn-icon:hover {
    background: var(--bg-card-hover);
    color: var(--accent-green);
    border-color: var(--accent-green);
    box-shadow: var(--shadow-glow);
}

/* ===== TAB NAVIGATION ===== */
.tab-nav {
    background: rgba(17, 24, 39, 0.6);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    position: relative;
    z-index: 1;
}

.tab-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    gap: 4px;
}

.tab-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 14px 24px;
    background: none;
    border: none;
    color: var(--text-muted);
    font-family: 'Inter', sans-serif;
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    position: relative;
    border-bottom: 2px solid transparent;
}

.tab-btn:hover {
    color: var(--text-secondary);
}

.tab-btn.active {
    color: var(--accent-green);
    border-bottom-color: var(--accent-green);
}

.tab-btn.active svg {
    filter: drop-shadow(0 0 4px rgba(34, 197, 94, 0.4));
}

/* ===== MAIN CONTENT ===== */
.main-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 24px;
    position: relative;
    z-index: 1;
}

.tab-content {
    display: none;
    animation: fadeIn 0.4s ease;
}

.tab-content.active {
    display: block;
}

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

/* ===== FORM CARDS ===== */
.form-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 24px;
    margin-bottom: 20px;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.form-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--gradient-green);
    opacity: 0;
    transition: var(--transition);
}

.form-card:hover {
    border-color: rgba(34, 197, 94, 0.3);
    box-shadow: var(--shadow-glow);
}

.form-card:hover::before {
    opacity: 1;
}

.card-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 20px;
}

.card-icon {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-sm);
    background: rgba(34, 197, 94, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--accent-green);
}

.card-icon.charges-icon {
    background: rgba(59, 130, 246, 0.1);
    color: var(--accent-blue);
}

.card-icon.remarks-icon {
    background: rgba(139, 92, 246, 0.1);
    color: var(--accent-purple);
}

.card-header h2 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
}

/* ===== FORM ELEMENTS ===== */
.form-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

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

label {
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.required {
    color: var(--accent-red);
}

input, textarea {
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: 12px 16px;
    color: var(--text-primary);
    font-family: 'Inter', sans-serif;
    font-size: 0.95rem;
    transition: var(--transition);
    outline: none;
}

input::placeholder, textarea::placeholder {
    color: var(--text-muted);
}

input:focus, textarea:focus {
    border-color: var(--accent-green);
    box-shadow: 0 0 0 3px var(--accent-green-glow);
}

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

.input-with-prefix {
    display: flex;
    align-items: stretch;
}

.input-prefix {
    display: flex;
    align-items: center;
    padding: 0 16px;
    background: rgba(34, 197, 94, 0.12);
    border: 1px solid var(--border-color);
    border-right: none;
    border-radius: var(--radius-sm) 0 0 var(--radius-sm);
    color: var(--accent-green);
    font-weight: 700;
    font-size: 1.05rem;
    letter-spacing: 0.5px;
}

.input-with-prefix input {
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    flex: 1;
}

/* ===== BUTTONS ===== */
.action-buttons {
    display: flex;
    gap: 12px;
    margin-top: 8px;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    border: none;
    border-radius: var(--radius-sm);
    font-family: 'Inter', sans-serif;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    white-space: nowrap;
}

.btn-primary {
    background: var(--gradient-blue);
    color: white;
    box-shadow: 0 4px 14px rgba(59, 130, 246, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(59, 130, 246, 0.4);
}

.btn-secondary {
    background: var(--bg-card);
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background: var(--bg-card-hover);
    color: var(--text-primary);
    border-color: var(--text-muted);
}

.btn-success {
    background: var(--gradient-green);
    color: white;
    box-shadow: 0 4px 14px rgba(34, 197, 94, 0.3);
}

.btn-success:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(34, 197, 94, 0.4);
}

.btn-danger {
    background: rgba(239, 68, 68, 0.1);
    color: var(--accent-red);
    border: 1px solid rgba(239, 68, 68, 0.3);
}

.btn-danger:hover {
    background: rgba(239, 68, 68, 0.2);
}

.btn-sm {
    padding: 6px 12px;
    font-size: 0.8rem;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none !important;
}

/* ===== HISTORY TAB ===== */
.history-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.search-box {
    display: flex;
    align-items: center;
    gap: 10px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: 0 16px;
    flex: 1;
    max-width: 500px;
    transition: var(--transition);
}

.search-box:focus-within {
    border-color: var(--accent-green);
    box-shadow: 0 0 0 3px var(--accent-green-glow);
}

.search-box svg {
    color: var(--text-muted);
    flex-shrink: 0;
}

.search-box input {
    background: none;
    border: none;
    padding: 12px 0;
    flex: 1;
}

.search-box input:focus {
    box-shadow: none;
}

.history-stats span {
    font-size: 0.85rem;
    color: var(--text-muted);
    background: var(--bg-card);
    padding: 8px 16px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-color);
}

/* ===== HISTORY TABLE ===== */
.history-table-wrapper {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.history-table {
    width: 100%;
    border-collapse: collapse;
}

.history-table thead {
    background: rgba(34, 197, 94, 0.05);
    border-bottom: 1px solid var(--border-color);
}

.history-table th {
    padding: 14px 16px;
    text-align: left;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.history-table td {
    padding: 14px 16px;
    font-size: 0.9rem;
    color: var(--text-secondary);
    border-bottom: 1px solid rgba(42, 53, 80, 0.5);
}

.history-table tbody tr {
    transition: var(--transition);
}

.history-table tbody tr:hover {
    background: var(--bg-card-hover);
}

.history-table tbody tr:last-child td {
    border-bottom: none;
}

.table-actions {
    display: flex;
    gap: 6px;
}

.action-btn {
    width: 32px;
    height: 32px;
    border-radius: 6px;
    border: 1px solid var(--border-color);
    background: var(--bg-input);
    color: var(--text-muted);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
}

.action-btn:hover {
    border-color: var(--accent-green);
    color: var(--accent-green);
    background: rgba(34, 197, 94, 0.1);
}

.action-btn.delete:hover {
    border-color: var(--accent-red);
    color: var(--accent-red);
    background: rgba(239, 68, 68, 0.1);
}

.email-badge {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 4px 10px;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
}

.email-badge.sent {
    background: rgba(34, 197, 94, 0.1);
    color: var(--accent-green);
}

.email-badge.pending {
    background: rgba(245, 158, 11, 0.1);
    color: var(--accent-orange);
}

/* ===== EMPTY STATE ===== */
.empty-state {
    display: none;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 60px 20px;
    color: var(--text-muted);
    text-align: center;
}

.empty-state.visible {
    display: flex;
}

.empty-state svg {
    margin-bottom: 16px;
    opacity: 0.3;
}

.empty-state h3 {
    font-size: 1.2rem;
    margin-bottom: 8px;
    color: var(--text-secondary);
}

.empty-state p {
    font-size: 0.9rem;
}

/* ===== MODALS ===== */
.modal-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(4px);
    z-index: 1000;
    align-items: center;
    justify-content: center;
    padding: 20px;
    animation: fadeIn 0.3s ease;
}

.modal-overlay.active {
    display: flex;
}

.modal-content {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    width: 100%;
    max-width: 560px;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-lg);
    animation: slideUp 0.3s ease;
}

.modal-large {
    max-width: 900px;
    max-height: 95vh;
}

@keyframes slideUp {
    from { opacity: 0; transform: translateY(20px) scale(0.98); }
    to { opacity: 1; transform: translateY(0) scale(1); }
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px 24px;
    border-bottom: 1px solid var(--border-color);
}

.modal-header h3 {
    font-size: 1.1rem;
    font-weight: 600;
}

.modal-close {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    border: 1px solid var(--border-color);
    background: var(--bg-card);
    color: var(--text-muted);
    font-size: 1.2rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.modal-close:hover {
    background: rgba(239, 68, 68, 0.1);
    border-color: var(--accent-red);
    color: var(--accent-red);
}

.modal-body {
    padding: 24px;
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: 10px;
    padding: 16px 24px;
    border-top: 1px solid var(--border-color);
}

.pdf-preview-frame {
    width: 100%;
    height: 65vh;
    border: none;
    border-radius: var(--radius-sm);
    background: white;
}

.email-attachment {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px 16px;
    background: rgba(34, 197, 94, 0.05);
    border: 1px dashed rgba(34, 197, 94, 0.3);
    border-radius: var(--radius-sm);
    color: var(--accent-green);
    font-size: 0.85rem;
    margin-top: 8px;
}

/* ===== SETTINGS ===== */
.settings-info {
    padding: 16px;
    background: rgba(59, 130, 246, 0.05);
    border: 1px solid rgba(59, 130, 246, 0.2);
    border-radius: var(--radius-sm);
    margin-bottom: 20px;
}

.settings-info p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.link-external {
    color: var(--accent-blue);
    font-size: 0.85rem;
    text-decoration: none;
    font-weight: 500;
}

.link-external:hover {
    text-decoration: underline;
}

/* ===== TOAST NOTIFICATIONS ===== */
.toast-container {
    position: fixed;
    bottom: 24px;
    right: 24px;
    z-index: 2000;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.toast {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 14px 20px;
    border-radius: var(--radius-sm);
    color: white;
    font-size: 0.9rem;
    font-weight: 500;
    animation: toastIn 0.4s ease;
    box-shadow: var(--shadow-lg);
    min-width: 300px;
    max-width: 450px;
}

.toast.success {
    background: linear-gradient(135deg, #16a34a, #15803d);
}

.toast.error {
    background: linear-gradient(135deg, #dc2626, #b91c1c);
}

.toast.info {
    background: linear-gradient(135deg, #2563eb, #1d4ed8);
}

.toast.warning {
    background: linear-gradient(135deg, #d97706, #b45309);
}

@keyframes toastIn {
    from { opacity: 0; transform: translateX(60px); }
    to { opacity: 1; transform: translateX(0); }
}

@keyframes toastOut {
    from { opacity: 1; transform: translateX(0); }
    to { opacity: 0; transform: translateX(60px); }
}

/* ===== LOADING ===== */
.loading-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(8px);
    z-index: 3000;
    align-items: center;
    justify-content: center;
}

.loading-overlay.active {
    display: flex;
}

.loading-spinner {
    text-align: center;
}

.spinner {
    width: 48px;
    height: 48px;
    border: 3px solid var(--border-color);
    border-top-color: var(--accent-green);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin: 0 auto 16px;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.loading-spinner p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
    .header-content {
        padding: 12px 16px;
    }

    .main-content {
        padding: 16px;
    }

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

    .action-buttons {
        flex-direction: column;
    }

    .btn {
        justify-content: center;
    }

    .history-header {
        flex-direction: column;
    }

    .search-box {
        max-width: 100%;
    }

    .history-table-wrapper {
        overflow-x: auto;
    }

    .modal-content {
        margin: 10px;
    }

    .pdf-preview-frame {
        height: 50vh;
    }

    .tab-btn {
        padding: 12px 16px;
        font-size: 0.85rem;
    }
}

@media (max-width: 480px) {
    .logo-text h1 {
        font-size: 1.1rem;
    }

    .logo-text span {
        font-size: 0.65rem;
    }

    .form-card {
        padding: 16px;
    }
}

/* Appended CSS for Login and Responsiveness */

/* ========== LOGIN OVERLAY ========== */
.login-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--bg-primary);
    z-index: 9999;
    display: none;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.login-overlay.active {
    display: flex;
}

.login-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 40px;
    width: 100%;
    max-width: 400px;
    text-align: center;
    box-shadow: var(--shadow-lg);
}

.login-card h2 {
    margin-bottom: 8px;
    color: var(--text-primary);
}

.login-card p {
    color: var(--text-muted);
    margin-bottom: 24px;
    font-size: 0.9rem;
}

.login-form .form-group {
    text-align: left;
    margin-bottom: 16px;
}

/* ========== MOBILE RESPONSIVENESS ========== */
@media (max-width: 768px) {
    .form-grid {
        grid-template-columns: 1fr;
    }
    
    .header-content {
        flex-direction: column;
        gap: 16px;
        padding: 16px;
    }
    
    .tab-container {
        padding: 0 16px;
        overflow-x: auto;
    }
    
    .main-content {
        padding: 16px;
    }
    
    .action-buttons {
        flex-direction: column;
    }
    
    .action-buttons .btn {
        width: 100%;
        justify-content: center;
    }
    
    .history-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 16px;
    }
    
    .search-box {
        width: 100%;
    }
    
    .search-box input {
        width: 100%;
    }
    
    .history-table-wrapper {
        overflow-x: auto;
    }
}

.header-actions { display: flex; flex-direction: row !important; gap: 8px; align-items: center; justify-content: flex-end; }