:root {
    --primary-color: #0f62fe;
    --primary-hover: #0043ce;
    --success-color: #24a148;
    --success-hover: #198038;
    --warning-color: #f1c21b;
    --danger-color: #da1e28;
    --secondary-color: #f4f4f4;
    --text-main: #161616;
    --text-muted: #525252;
    --border-subtle: #e0e0e0;
    --border-strong: #8d8d8d;
}

body {
    font-family: 'IBM Plex Sans', sans-serif;
    background-color: #f4f4f4;
    color: var(--text-main);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

h1, h2, h3, h4, h5, h6, .navbar-brand {
    font-family: 'IBM Plex Sans', sans-serif;
    font-weight: 400;
}

/* Global Overrides for IBM Carbon flat look */
* {
    border-radius: 0 !important;
}

/* Navbar */
.premium-navbar {
    background: #161616; /* Gray 100 */
    border-bottom: 1px solid #393939; /* Gray 80 */
    padding: 1rem 0;
}
.navbar-brand {
    font-size: 1.25rem;
    font-weight: 600;
    color: #ffffff !important;
}
.navbar-nav .nav-link {
    font-weight: 400;
    color: #c6c6c6 !important;
    padding: 0.875rem 1rem !important;
    transition: color 0.1s ease, background-color 0.1s ease;
}
.navbar-nav .nav-link:hover {
    color: #ffffff !important;
    background-color: #393939;
}

/* Main Content Wrapper */
.main-content {
    flex: 1 0 auto;
    padding-bottom: 3rem;
}

/* Auth Pages Wrapper */
.auth-wrapper {
    background-color: #f4f4f4;
    min-height: calc(100vh - 75px);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 3rem 0;
}

/* Flat Card for Auth */
.glass-card {
    background: #ffffff;
    border: 1px solid var(--border-subtle);
    padding: 2.5rem;
    width: 100%;
    max-width: 480px;
    margin: auto;
}

/* Form Controls */
.form-label {
    font-weight: 400;
    color: var(--text-muted);
    font-size: 0.875rem;
    margin-bottom: 0.25rem;
}
.form-control, .form-select {
    padding: 0.75rem 1rem;
    border: 1px solid var(--border-strong);
    background-color: #f4f4f4;
    color: var(--text-main);
    box-shadow: none !important;
}
.form-control:focus, .form-select:focus {
    border: 1px solid var(--primary-color);
    box-shadow: inset 0 0 0 1px var(--primary-color) !important;
    background-color: #ffffff;
    outline: none;
}
.input-group-text {
    border: 1px solid var(--border-strong);
    background-color: #f4f4f4;
    color: var(--text-main);
    border-right: none;
}
.form-control.border-start-0 {
    border-left: none;
}
.form-control.border-end-0 {
    border-right: none;
}
.input-group > .btn.border-start-0 {
    border: 1px solid var(--border-strong);
    border-left: none;
    background-color: #f4f4f4;
    color: var(--text-muted);
}
.input-group > .btn.border-start-0:hover {
    background-color: #e0e0e0;
}

/* Buttons */
.btn-primary {
    background-color: var(--primary-color);
    border: 1px solid transparent;
    padding: 0.875rem 1.5rem;
    font-weight: 400;
    box-shadow: none !important;
    transition: background-color 0.1s ease;
    color: #ffffff;
}
.btn-primary:hover, .btn-primary:focus {
    background-color: var(--primary-hover);
    border-color: transparent;
    color: #ffffff;
}
.btn-success {
    background-color: var(--success-color);
    border: 1px solid transparent;
    padding: 0.875rem 1.5rem;
    font-weight: 400;
    box-shadow: none !important;
    transition: background-color 0.1s ease;
    color: #ffffff;
}
.btn-success:hover, .btn-success:focus {
    background-color: var(--success-hover);
    border-color: transparent;
    color: #ffffff;
}

/* Dashboard Cards */
.dash-card {
    border: 1px solid var(--border-subtle);
    background: #ffffff;
    box-shadow: none;
}

.stat-card {
    border: 1px solid var(--border-subtle);
    background-color: #ffffff;
    color: var(--text-main);
}
.stat-card.bg-primary {
    background-color: var(--primary-color) !important;
    color: #ffffff !important;
    border-color: var(--primary-color);
}
.stat-card.bg-success {
    background-color: var(--success-color) !important;
    color: #ffffff !important;
    border-color: var(--success-color);
}
.stat-card.bg-warning {
    background-color: var(--warning-color) !important;
    color: #161616 !important;
    border-color: var(--warning-color);
}
.stat-card.bg-danger {
    background-color: var(--danger-color) !important;
    color: #ffffff !important;
    border-color: var(--danger-color);
}
.stat-card::after {
    display: none; /* Removed circle background for flat look */
}

/* Document Viewer & Signature Section */
.signature-wrapper {
    border: 1px solid var(--border-strong);
    background: #ffffff;
    position: relative;
    overflow: hidden;
}
canvas#signaturePad {
    width: 100%;
    height: 220px;
    cursor: crosshair;
}

/* Digital Certificate Styles */
.certificate-container {
    background-color: #ffffff;
    border: 1px solid var(--border-strong);
    padding: 3rem;
    max-width: 900px;
    margin: 2rem auto;
    position: relative;
}
.certificate-watermark {
    display: none; /* Removed for flat professional look */
}
.certificate-content {
    position: relative;
    z-index: 2;
}
.certificate-header {
    border-bottom: 1px solid var(--border-subtle);
    padding-bottom: 1.5rem;
}
.certificate-seal {
    width: 90px;
    height: 90px;
    border: 1px solid var(--success-color);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    color: var(--success-color);
    font-size: 2.2rem;
    background: transparent;
}
.certificate-meta-box {
    background-color: #f4f4f4;
    border: 1px solid var(--border-subtle);
    padding: 1.5rem;
}
.biometric-img {
    width: 100%;
    max-width: 180px;
    border: 1px solid var(--border-subtle);
}
.signature-img-display {
    max-height: 80px;
    object-fit: contain;
}
.hash-code {
    font-family: 'IBM Plex Sans', Courier, monospace;
    font-size: 0.85rem;
    background: #f4f4f4;
    padding: 0.5rem;
    border: 1px solid var(--border-subtle);
    word-break: break-all;
}

/* Footer layout */
.footer {
    background-color: #ffffff;
    border-top: 1px solid var(--border-subtle);
    color: var(--text-muted);
}

@media print {
    .premium-navbar, .footer, .btn, .no-print {
        display: none !important;
    }
    body {
        background-color: #fff;
    }
    .certificate-container {
        border: 1px solid #161616;
        margin: 0;
        padding: 1.5rem;
    }
}