/*
 * MIMH Registration Platform — Admin Stylesheet
 * Clean, professional design with MIMH red branding.
 * Conference-specific colors are injected via inline CSS variables
 * on public-facing registration pages.
 *
 * Version: 1.0.0
 */

/* ============================================================
   CSS CUSTOM PROPERTIES (Design Tokens)
   ============================================================ */
:root {
    /* MIMH Brand Colors */
    --mimh-red:          #C8102E;
    --mimh-red-dark:     #a00e25;
    --mimh-red-light:    #f9e8eb;
    --mimh-black:        #1a1a1a;
    --mimh-gray-dark:    #444444;
    --mimh-gray:         #888888;
    --mimh-gray-light:   #e5e7eb;
    --mimh-bg:           #f0f2f5;
    --mimh-white:        #ffffff;

    /* Semantic Colors */
    --color-success:     #22c55e;
    --color-success-bg:  #d1fae5;
    --color-warning:     #f59e0b;
    --color-warning-bg:  #fef3c7;
    --color-danger:      #ef4444;
    --color-danger-bg:   #fee2e2;
    --color-info:        #3b82f6;
    --color-info-bg:     #dbeafe;

    /* Layout */
    --sidebar-width:     240px;
    --header-height:     64px;
    --content-max:       1400px;

    /* Typography */
    --font-base:         Arial, 'Helvetica Neue', sans-serif;
    --font-mono:         'Courier New', Courier, monospace;
    --text-base:         14px;
    --text-sm:           12px;
    --text-lg:           16px;
    --text-xl:           20px;
    --text-2xl:          24px;

    /* Spacing */
    --space-xs:  4px;
    --space-sm:  8px;
    --space-md:  16px;
    --space-lg:  24px;
    --space-xl:  32px;
    --space-2xl: 48px;

    /* Borders & Shadows */
    --border-radius:     4px;
    --border-radius-lg:  8px;
    --border-color:      #e5e7eb;
    --shadow-sm:         0 1px 3px rgba(0,0,0,0.08);
    --shadow-md:         0 4px 16px rgba(0,0,0,0.10);
}

/* ============================================================
   RESET & BASE
   ============================================================ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html, body {
    height: 100%;
    font-family: var(--font-base);
    font-size: var(--text-base);
    color: var(--mimh-black);
    background: var(--mimh-bg);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

a { color: var(--mimh-red); text-decoration: none; }
a:hover { text-decoration: underline; }

img { max-width: 100%; display: block; }

code {
    font-family: var(--font-mono);
    background: var(--mimh-gray-light);
    padding: 2px 6px;
    border-radius: 3px;
    font-size: var(--text-sm);
}

/* ============================================================
   ADMIN LAYOUT — SIDEBAR + MAIN
   ============================================================ */
.admin-layout {
    display: flex;
    min-height: 100vh;
}

/* Sidebar */
.admin-sidebar {
    width: var(--sidebar-width);
    background: var(--mimh-black);
    color: var(--mimh-white);
    flex-shrink: 0;
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 0;
    left: 0;
    height: 100vh;
    overflow-y: auto;
    z-index: 100;
}

.sidebar-logo {
    padding: var(--space-lg) var(--space-md);
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

.sidebar-logo img { max-height: 44px; }

.sidebar-nav { flex: 1; padding: var(--space-sm) 0; }

.sidebar-section-label {
    font-size: 10px;
    font-weight: bold;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: rgba(255,255,255,0.4);
    padding: var(--space-sm) var(--space-md) var(--space-xs);
    margin-top: var(--space-sm);
}

.sidebar-link {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: 10px var(--space-md);
    color: rgba(255,255,255,0.75);
    font-size: var(--text-base);
    transition: background 0.15s, color 0.15s;
    border-left: 3px solid transparent;
}

.sidebar-link:hover,
.sidebar-link.active {
    background: rgba(255,255,255,0.08);
    color: var(--mimh-white);
    text-decoration: none;
}

.sidebar-link.active {
    border-left-color: var(--mimh-red);
    color: var(--mimh-white);
}

.sidebar-link .icon { width: 16px; text-align: center; opacity: 0.8; }

/* Badge on sidebar for unread counts */
.sidebar-badge {
    margin-left: auto;
    background: var(--mimh-red);
    color: white;
    font-size: 10px;
    font-weight: bold;
    padding: 2px 6px;
    border-radius: 10px;
    min-width: 18px;
    text-align: center;
}

.sidebar-footer {
    padding: var(--space-md);
    border-top: 1px solid rgba(255,255,255,0.1);
    font-size: var(--text-sm);
    color: rgba(255,255,255,0.5);
}

/* Main content area — offset by sidebar width */
.admin-main {
    flex: 1;
    margin-left: var(--sidebar-width);
    padding: var(--space-xl);
    max-width: calc(var(--content-max) - var(--sidebar-width));
}

/* ============================================================
   PAGE HEADER
   ============================================================ */
.page-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    margin-bottom: var(--space-xl);
    flex-wrap: wrap;
    gap: var(--space-md);
}

.page-title {
    font-size: var(--text-2xl);
    font-weight: bold;
    color: var(--mimh-black);
    margin-bottom: 4px;
}

.page-subtitle {
    color: var(--mimh-gray);
    font-size: var(--text-sm);
}

/* ============================================================
   STAT CARDS
   ============================================================ */
.stat-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--space-md);
    margin-bottom: var(--space-xl);
}

.stat-card {
    background: var(--mimh-white);
    border-radius: var(--border-radius-lg);
    padding: var(--space-lg);
    box-shadow: var(--shadow-sm);
    border-left: 4px solid var(--mimh-gray-light);
}

.stat-card--green  { border-left-color: var(--color-success); }
.stat-card--alert  { border-left-color: var(--color-danger);  background: var(--color-danger-bg); }
.stat-card--warning{ border-left-color: var(--color-warning); background: var(--color-warning-bg); }

.stat-label {
    font-size: var(--text-sm);
    color: var(--mimh-gray);
    font-weight: bold;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--space-xs);
}

.stat-value {
    font-size: 28px;
    font-weight: bold;
    color: var(--mimh-black);
    margin-bottom: var(--space-xs);
}

.stat-link {
    font-size: var(--text-sm);
    color: var(--mimh-red);
}

/* ============================================================
   CONTENT CARDS
   ============================================================ */
.content-card {
    background: var(--mimh-white);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-sm);
    margin-bottom: var(--space-xl);
    overflow: hidden;
}

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

.content-card-header h2 {
    font-size: var(--text-lg);
    font-weight: bold;
}

.content-card-body {
    padding: var(--space-lg);
}

/* ============================================================
   DATA TABLES
   ============================================================ */
.data-table {
    width: 100%;
    border-collapse: collapse;
    font-size: var(--text-base);
}

.data-table th {
    text-align: left;
    padding: var(--space-sm) var(--space-md);
    font-size: var(--text-sm);
    font-weight: bold;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--mimh-gray);
    background: var(--mimh-bg);
    border-bottom: 1px solid var(--border-color);
    white-space: nowrap;
}

.data-table td {
    padding: var(--space-sm) var(--space-md);
    border-bottom: 1px solid var(--border-color);
    vertical-align: middle;
}

.data-table tr:last-child td { border-bottom: none; }
.data-table tr:hover td { background: #fafafa; }

.empty-state {
    text-align: center;
    padding: var(--space-2xl) !important;
    color: var(--mimh-gray);
}

/* ============================================================
   BUTTONS
   ============================================================ */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    padding: 8px 16px;
    border-radius: var(--border-radius);
    font-size: var(--text-base);
    font-weight: bold;
    cursor: pointer;
    border: 1px solid transparent;
    text-decoration: none;
    transition: background 0.15s, border-color 0.15s;
    line-height: 1;
    white-space: nowrap;
}

.btn:hover { text-decoration: none; }

.btn-primary {
    background: var(--mimh-red);
    color: #fff;
    border-color: var(--mimh-red);
}
.btn-primary:hover {
    background: var(--mimh-red-dark);
    border-color: var(--mimh-red-dark);
    color: #fff;
}

.btn-secondary {
    background: var(--mimh-white);
    color: var(--mimh-black);
    border-color: var(--border-color);
}
.btn-secondary:hover {
    background: var(--mimh-bg);
    color: var(--mimh-black);
}

.btn-danger {
    background: var(--color-danger);
    color: #fff;
    border-color: var(--color-danger);
}

.btn-success {
    background: var(--color-success);
    color: #fff;
    border-color: var(--color-success);
}
.btn-success:hover { background: #16a34a; color: #fff; text-decoration: none; }

.btn-sm {
    padding: 5px 10px;
    font-size: var(--text-sm);
}

.btn-lg {
    padding: 12px 24px;
    font-size: var(--text-lg);
}

/* ============================================================
   BADGES (Status Indicators)
   ============================================================ */
.badge {
    display: inline-block;
    padding: 3px 8px;
    border-radius: 12px;
    font-size: var(--text-sm);
    font-weight: bold;
    text-transform: capitalize;
}

.badge--active,
.badge--paid       { background: var(--color-success-bg); color: #065f46; }
.badge--pending    { background: var(--color-warning-bg); color: #78350f; }
.badge--invoiced   { background: var(--color-info-bg);    color: #1e40af; }
.badge--overdue,
.badge--cancelled  { background: var(--color-danger-bg);  color: #7f1d1d; }
.badge--draft,
.badge--archived   { background: var(--mimh-gray-light);  color: var(--mimh-gray-dark); }
.badge--closed     { background: var(--mimh-gray-light);  color: var(--mimh-gray-dark); }
.badge--matched    { background: var(--color-success-bg); color: #065f46; }
.badge--unmatched  { background: var(--color-danger-bg);  color: #7f1d1d; }

/* ============================================================
   FORMS
   ============================================================ */
.form-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-md);
}

.form-grid-3 {
    grid-template-columns: 1fr 1fr 1fr;
}

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

.form-group { margin-bottom: var(--space-md); }

.form-label {
    display: block;
    font-size: var(--text-sm);
    font-weight: bold;
    color: var(--mimh-gray-dark);
    margin-bottom: 5px;
}

.form-label .required { color: var(--mimh-red); margin-left: 2px; }

.form-control {
    width: 100%;
    padding: 9px 12px;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    font-size: var(--text-base);
    font-family: var(--font-base);
    color: var(--mimh-black);
    background: var(--mimh-white);
    transition: border-color 0.15s;
}

.form-control:focus {
    outline: none;
    border-color: var(--mimh-red);
    box-shadow: 0 0 0 3px rgba(200, 16, 46, 0.1);
}

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

.form-hint {
    font-size: var(--text-sm);
    color: var(--mimh-gray);
    margin-top: 4px;
}

.form-error {
    font-size: var(--text-sm);
    color: var(--color-danger);
    margin-top: 4px;
}

/* ============================================================
   ALERTS / NOTIFICATIONS
   ============================================================ */
.alert {
    padding: var(--space-md);
    border-radius: var(--border-radius);
    margin-bottom: var(--space-md);
    font-size: var(--text-base);
    display: flex;
    align-items: flex-start;
    gap: var(--space-sm);
}

.alert-success { background: var(--color-success-bg); color: #065f46; border: 1px solid #6ee7b7; }
.alert-error   { background: var(--color-danger-bg);  color: #7f1d1d; border: 1px solid #fca5a5; }
.alert-warning { background: var(--color-warning-bg); color: #78350f; border: 1px solid #fcd34d; }
.alert-info    { background: var(--color-info-bg);    color: #1e40af; border: 1px solid #93c5fd; }

/* ============================================================
   UTILITY CLASSES
   ============================================================ */
.text-green   { color: var(--color-success); }
.text-red     { color: var(--color-danger); }
.text-warning { color: var(--color-warning); }
.text-muted   { color: var(--mimh-gray); }
.text-right   { text-align: right; }
.text-center  { text-align: center; }
.text-bold    { font-weight: bold; }
.text-sm      { font-size: var(--text-sm); }

.mt-sm  { margin-top: var(--space-sm); }
.mt-md  { margin-top: var(--space-md); }
.mt-lg  { margin-top: var(--space-lg); }
.mb-md  { margin-bottom: var(--space-md); }
.mb-lg  { margin-bottom: var(--space-lg); }

.flex         { display: flex; }
.flex-between { display: flex; justify-content: space-between; align-items: center; }
.flex-gap     { gap: var(--space-sm); }
.flex-wrap    { flex-wrap: wrap; }

/* ============================================================
   PAGINATION
   ============================================================ */
.pagination {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    padding: var(--space-md) var(--space-lg);
    border-top: 1px solid var(--border-color);
    font-size: var(--text-sm);
}

.pagination-info { color: var(--mimh-gray); margin-right: auto; }

.page-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
    color: var(--mimh-black);
    font-weight: bold;
    transition: background 0.15s;
}

.page-link:hover      { background: var(--mimh-bg); text-decoration: none; }
.page-link.active     { background: var(--mimh-red); color: #fff; border-color: var(--mimh-red); }
.page-link.disabled   { opacity: 0.4; cursor: not-allowed; pointer-events: none; }

/* ============================================================
   RESPONSIVE — Collapse sidebar on small screens
   ============================================================ */
@media (max-width: 900px) {
    .admin-sidebar { transform: translateX(-100%); transition: transform 0.2s; }
    .admin-sidebar.open { transform: translateX(0); }
    .admin-main { margin-left: 0; padding: var(--space-md); }
    .form-grid { grid-template-columns: 1fr; }
    .form-grid-3 { grid-template-columns: 1fr; }
    .stat-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 600px) {
    .stat-grid { grid-template-columns: 1fr; }
    .data-table { font-size: var(--text-sm); }
    .data-table th, .data-table td { padding: var(--space-xs) var(--space-sm); }
}