/**
 * Conference Management & Peer Review Platform - Master Design System
 * Theme: Light Mode Only (Academic, Modern, High Contrast, Accessible)
 */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&display=swap');

:root {
    --font-sans: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    
    /* Light Theme Neutral Colors */
    --bg-page: #F8FAFC;
    --bg-card: #FFFFFF;
    --bg-card-subtle: #F1F5F9;
    --border-color: #E2E8F0;
    --border-hover: #CBD5E1;
    
    /* Text Colors (High Contrast) */
    --text-main: #0F172A;
    --text-muted: #475569;
    --text-subtle: #64748B;
    --text-light: #94A3B8;

    /* Professional Gradient Accents */
    --gradient-primary: linear-gradient(135deg, #1E3A8A 0%, #2563EB 100%);
    --gradient-header: linear-gradient(135deg, #0F172A 0%, #1E293B 100%);
    --gradient-success: linear-gradient(135deg, #065F46 0%, #059669 100%);
    --gradient-warning: linear-gradient(135deg, #92400E 0%, #D97706 100%);
    --gradient-danger: linear-gradient(135deg, #991B1B 0%, #DC2626 100%);
    --gradient-info: linear-gradient(135deg, #0369A1 0%, #0284C7 100%);
    --gradient-card-1: linear-gradient(135deg, #FFFFFF 0%, #F0FDF4 100%);
    --gradient-card-2: linear-gradient(135deg, #FFFFFF 0%, #EFF6FF 100%);
    --gradient-card-3: linear-gradient(135deg, #FFFFFF 0%, #FEF3C7 100%);
    --gradient-card-4: linear-gradient(135deg, #FFFFFF 0%, #F5F3FF 100%);

    /* Primary Brand Colors */
    --primary: #2563EB;
    --primary-hover: #1D4ED8;
    --primary-focus: rgba(37, 99, 235, 0.25);
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 14px;
}

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

html, body {
    overflow-x: hidden;
    max-width: 100%;
}

body {
    font-family: var(--font-sans);
    background-color: var(--bg-page);
    color: var(--text-main);
    line-height: 1.6;
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* Accessibility Focus States */
:focus-visible {
    outline: 3px solid #2563EB !important;
    outline-offset: 2px !important;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    color: var(--text-main);
    font-weight: 700;
    line-height: 1.25;
}

h1 { font-size: 2rem; }
h2 { font-size: 1.65rem; }
h3 { font-size: 1.35rem; }
h4 { font-size: 1.15rem; }

a {
    color: var(--primary);
    text-decoration: none;
    transition: color 0.15s ease-in-out;
}
a:hover {
    color: var(--primary-hover);
    text-decoration: underline;
}

/* Containers */
.container {
    width: 100%;
    max-width: 1240px;
    margin-left: auto;
    margin-right: auto;
    padding-left: 1.25rem;
    padding-right: 1.25rem;
}

/* Header & Navbar */
.site-header {
    background: var(--gradient-header);
    color: #FFFFFF;
    box-shadow: var(--shadow-md);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.site-header .container {
    max-width: 1600px;
}

.navbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    min-height: 70px;
    gap: 1rem;
}

.brand {
    display: flex;
    align-items: center;
    gap: 0.85rem;
    color: #FFFFFF;
    text-decoration: none;
    letter-spacing: -0.01em;
    flex-shrink: 0;
}
.brand:hover {
    text-decoration: none;
    color: #FFFFFF;
}

.brand-logo-container {
    background: #FFFFFF;
    padding: 4px 10px;
    border-radius: var(--radius-sm);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.2);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    flex-shrink: 0;
}
.brand:hover .brand-logo-container {
    transform: translateY(-1px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.25);
}

.brand-logo-img {
    height: 40px;
    width: auto;
    max-width: 170px;
    object-fit: contain;
    display: block;
}

.brand-text {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    flex-wrap: nowrap;
}

.brand-name {
    color: #FFFFFF;
    font-size: 1.1rem;
    font-weight: 700;
    letter-spacing: -0.01em;
    line-height: 1.2;
    transition: color 0.15s ease;
    white-space: nowrap;
    max-width: 240px;
    overflow: hidden;
    text-overflow: ellipsis;
}
.brand:hover .brand-name {
    color: #93C5FD;
}

@media (min-width: 1650px) {
    .brand-name {
        max-width: 100%;
    }
}

.brand-badge {
    background: #2563EB;
    color: #FFFFFF;
    padding: 0.2rem 0.55rem;
    border-radius: var(--radius-sm);
    font-size: 0.72rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    white-space: nowrap;
    flex-shrink: 0;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 0.65rem;
    list-style: none;
    flex-shrink: 0;
}

.nav-links a {
    color: #E2E8F0;
    font-weight: 600;
    font-size: 0.88rem;
    padding: 0.4rem 0.55rem;
    border-radius: var(--radius-sm);
    transition: all 0.15s ease;
    white-space: nowrap;
}
.nav-links a:hover,
.nav-links a.active {
    color: #FFFFFF;
    background: rgba(255, 255, 255, 0.12);
    text-decoration: none;
}

.mobile-menu-toggle {
    display: none;
    background: transparent;
    border: 1px solid rgba(255, 255, 255, 0.25);
    color: #FFFFFF;
    font-size: 1.5rem;
    padding: 0.4rem 0.75rem;
    border-radius: var(--radius-sm);
    cursor: pointer;
}

/* App Main Content Area */
.main-wrapper {
    flex: 1 0 auto;
    padding: 2rem 0;
}

/* Cards & Dashboards */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
}

.card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 1rem;
    margin-bottom: 1.25rem;
}

/* Dashboard Metric Cards (Readable by 60+ users) */
.metric-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
    gap: 1.25rem;
    margin-bottom: 2rem;
}

.metric-card {
    background: #FFFFFF;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 1.5rem;
    box-shadow: var(--shadow-sm);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    transition: transform 0.15s ease, box-shadow 0.15s ease;
}
.metric-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.metric-card.gradient-1 { background: var(--gradient-card-1); border-left: 5px solid #059669; }
.metric-card.gradient-2 { background: var(--gradient-card-2); border-left: 5px solid #2563EB; }
.metric-card.gradient-3 { background: var(--gradient-card-3); border-left: 5px solid #D97706; }
.metric-card.gradient-4 { background: var(--gradient-card-4); border-left: 5px solid #7C3AED; }

.metric-label {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.03em;
    margin-bottom: 0.5rem;
}

.metric-val {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--text-main);
    line-height: 1;
}

/* Buttons (Large Touch Targets min 44px) */
.btn,
a.btn,
button.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    font-weight: 600;
    font-size: 1rem;
    padding: 0.65rem 1.35rem;
    min-height: 44px;
    border-radius: var(--radius-sm);
    border: 1px solid transparent;
    cursor: pointer;
    text-decoration: none !important;
    transition: all 0.15s ease-in-out;
}

.btn:hover,
.btn:focus,
.btn:active,
a.btn:hover,
a.btn:focus,
a.btn:active,
button.btn:hover,
button.btn:focus,
button.btn:active {
    text-decoration: none !important;
}

/* Primary Button (Blue) - Text is always crisp white on hover/focus */
.btn-primary,
a.btn-primary,
button.btn-primary,
.btn-primary:visited,
a.btn-primary:visited {
    background: var(--gradient-primary);
    color: #FFFFFF !important;
    border-color: #1D4ED8;
}

.btn-primary:hover,
.btn-primary:focus,
.btn-primary:active,
a.btn-primary:hover,
a.btn-primary:focus,
a.btn-primary:active,
button.btn-primary:hover,
button.btn-primary:focus,
button.btn-primary:active {
    background: linear-gradient(135deg, #1E40AF 0%, #1D4ED8 100%);
    color: #FFFFFF !important;
    border-color: #1E40AF;
    box-shadow: 0 4px 10px rgba(37, 99, 235, 0.35);
    text-decoration: none !important;
}

/* Secondary Button (Light Grey Neutral) */
.btn-secondary,
a.btn-secondary,
button.btn-secondary,
.btn-secondary:visited,
a.btn-secondary:visited {
    background: #F1F5F9;
    color: #0F172A !important;
    border-color: #CBD5E1;
}

.btn-secondary:hover,
.btn-secondary:focus,
.btn-secondary:active,
a.btn-secondary:hover,
a.btn-secondary:focus,
a.btn-secondary:active,
button.btn-secondary:hover,
button.btn-secondary:focus,
button.btn-secondary:active {
    background: #E2E8F0;
    color: #0F172A !important;
    border-color: #94A3B8;
    text-decoration: none !important;
}

/* Success Button */
.btn-success,
a.btn-success,
button.btn-success,
.btn-success:visited,
a.btn-success:visited {
    background: var(--gradient-success);
    color: #FFFFFF !important;
    border-color: #059669;
}

.btn-success:hover,
.btn-success:focus,
.btn-success:active,
a.btn-success:hover,
a.btn-success:focus,
a.btn-success:active,
button.btn-success:hover,
button.btn-success:focus,
button.btn-success:active {
    background: linear-gradient(135deg, #064E3B 0%, #047857 100%);
    color: #FFFFFF !important;
    box-shadow: 0 4px 10px rgba(5, 150, 105, 0.35);
    text-decoration: none !important;
}

/* Danger Button */
.btn-danger,
a.btn-danger,
button.btn-danger,
.btn-danger:visited,
a.btn-danger:visited {
    background: var(--gradient-danger);
    color: #FFFFFF !important;
    border-color: #DC2626;
}

.btn-danger:hover,
.btn-danger:focus,
.btn-danger:active,
a.btn-danger:hover,
a.btn-danger:focus,
a.btn-danger:active,
button.btn-danger:hover,
button.btn-danger:focus,
button.btn-danger:active {
    background: linear-gradient(135deg, #7F1D1D 0%, #B91C1C 100%);
    color: #FFFFFF !important;
    box-shadow: 0 4px 10px rgba(220, 38, 38, 0.35);
    text-decoration: none !important;
}

.btn-sm {
    font-size: 0.875rem;
    padding: 0.4rem 0.8rem;
    min-height: 36px;
}

/* Site Header Actions & Sign Out Button */
.site-header .btn,
.nav-links .btn {
    min-height: 34px;
    padding: 0.35rem 0.75rem;
    font-size: 0.85rem;
    line-height: 1.2;
}

.site-header .btn-secondary,
.site-header a.btn-secondary,
.nav-links .btn-secondary,
.nav-sign-out {
    background: rgba(255, 255, 255, 0.12) !important;
    color: #F8FAFC !important;
    border: 1px solid rgba(255, 255, 255, 0.25) !important;
    backdrop-filter: blur(4px);
    transition: all 0.2s ease !important;
    text-decoration: none !important;
}

.site-header .btn-secondary:hover,
.site-header a.btn-secondary:hover,
.site-header .btn-secondary:focus,
.site-header a.btn-secondary:focus,
.site-header .btn-secondary:active,
.site-header a.btn-secondary:active,
.nav-links .btn-secondary:hover,
.nav-sign-out:hover,
.nav-sign-out:focus,
.nav-sign-out:active {
    background: #DC2626 !important;
    border-color: #EF4444 !important;
    color: #FFFFFF !important;
    box-shadow: 0 2px 8px rgba(220, 38, 38, 0.45) !important;
    text-decoration: none !important;
}

.site-header .btn-primary,
.site-header a.btn-primary,
.nav-links .btn-primary {
    background: #2563EB !important;
    color: #FFFFFF !important;
    border: 1px solid #3B82F6 !important;
    box-shadow: 0 2px 4px rgba(37, 99, 235, 0.25) !important;
}

.site-header .btn-primary:hover,
.site-header a.btn-primary:hover,
.site-header .btn-primary:focus,
.site-header a.btn-primary:focus,
.site-header .btn-primary:active,
.site-header a.btn-primary:active,
.nav-links .btn-primary:hover {
    background: #1D4ED8 !important;
    border-color: #60A5FA !important;
    color: #FFFFFF !important;
    box-shadow: 0 3px 8px rgba(37, 99, 235, 0.45) !important;
    text-decoration: none !important;
}

/* User Profile Badge in Header */
.user-profile-item {
    display: inline-flex;
    align-items: center;
    color: #E2E8F0;
    font-size: 0.85rem;
    padding: 0.35rem 0.65rem;
    background: rgba(255, 255, 255, 0.08);
    border-radius: var(--radius-sm);
    border: 1px solid rgba(255, 255, 255, 0.15);
    margin-left: 0.35rem;
    white-space: nowrap;
}

.user-profile-name {
    max-width: 140px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    font-weight: 500;
}

/* Form Controls */
.form-group {
    margin-bottom: 1.25rem;
}

.form-label {
    display: block;
    font-weight: 600;
    font-size: 0.95rem;
    color: var(--text-main);
    margin-bottom: 0.4rem;
}

.form-control, .form-select {
    width: 100%;
    min-height: 44px;
    padding: 0.6rem 0.85rem;
    font-size: 1rem;
    font-family: inherit;
    color: var(--text-main);
    background-color: #FFFFFF;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

textarea.form-control {
    min-height: 110px;
    line-height: 1.5;
    resize: vertical;
}

.form-control:focus, .form-select:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--primary-focus);
    outline: none;
}

.form-text {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-top: 0.3rem;
}

/* Status Badges */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 0.3rem 0.65rem;
    font-size: 0.8rem;
    font-weight: 700;
    border-radius: 9999px;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.badge-submitted { background: #DBEAFE; color: #1E40AF; }
.badge-under_review { background: #FEF3C7; color: #92400E; }
.badge-reviews_completed { background: #E0E7FF; color: #3730A3; }
.badge-decision_pending { background: #FDE68A; color: #78350F; }
.badge-accepted { background: #D1FAE5; color: #065F46; }
.badge-rejected { background: #FEE2E2; color: #991B1B; }
.badge-revision_required { background: #FFEDD5; color: #9A3412; }
.badge-camera_ready { background: #CCFBF1; color: #115E59; }
.badge-active { background: #D1FAE5; color: #065F46; }
.badge-suspended { background: #FEE2E2; color: #991B1B; }

/* Responsive Tables */
.table-responsive {
    width: 100%;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background: #FFFFFF;
}

.table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.95rem;
}

.table th, .table td {
    padding: 0.9rem 1.1rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
    vertical-align: middle;
}

.table th {
    background-color: var(--bg-card-subtle);
    color: var(--text-main);
    font-weight: 700;
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.table tbody tr:hover {
    background-color: #F8FAFC;
}

/* Alerts & Notifications */
.alert {
    padding: 1rem 1.25rem;
    border-radius: var(--radius-sm);
    margin-bottom: 1.5rem;
    font-weight: 500;
    border: 1px solid transparent;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.alert-success { background: #ECFDF5; color: #065F46; border-color: #A7F3D0; }
.alert-danger  { background: #FEF2F2; color: #991B1B; border-color: #FECACA; }
.alert-warning { background: #FFFBEB; color: #92400E; border-color: #FDE68A; }
.alert-info    { background: #EFF6FF; color: #1E40AF; border-color: #BFDBFE; }

/* In-Browser Manuscript Viewer Layout */
.viewer-container {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}
.viewer-frame-box {
    width: 100%;
    height: 700px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background: #525659;
}
.viewer-frame {
    width: 100%;
    height: 100%;
    border: none;
}

/* Dynamic Footer (Sections 26, 27, 56) */
.site-footer {
    background: #0F172A;
    color: #94A3B8;
    padding: 2.5rem 0 1.5rem 0;
    margin-top: auto;
    font-size: 0.95rem;
    border-top: 3px solid #2563EB;
}

.footer-inner {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: center;
    gap: 1.5rem;
    margin-bottom: 1.5rem;
}

.footer-counter {
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.15);
    padding: 0.6rem 1.25rem;
    border-radius: var(--radius-sm);
    color: #FFFFFF;
    font-weight: 600;
    font-size: 0.95rem;
    letter-spacing: 0.02em;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 1.25rem;
    text-align: center;
    font-size: 0.85rem;
    color: #64748B;
}

/* Responsive Media Queries */
@media (max-width: 1380px) {
    .brand-name {
        max-width: 160px;
        font-size: 0.95rem;
    }
    .brand-logo-img {
        height: 36px;
        max-width: 145px;
    }
    .brand-badge {
        display: none;
    }
    .nav-links {
        gap: 0.35rem;
    }
    .nav-links a {
        font-size: 0.84rem;
        padding: 0.35rem 0.45rem;
    }
    .user-profile-name {
        max-width: 100px;
    }
}

@media (max-width: 1180px) {
    .navbar {
        flex-wrap: wrap;
    }
    .mobile-menu-toggle {
        display: block;
    }
    .brand-name {
        max-width: 320px;
        font-size: 1rem;
    }
    .brand-badge {
        display: inline-block;
    }
    .nav-links {
        display: none;
        width: 100%;
        flex-direction: column;
        align-items: stretch;
        padding-top: 1rem;
        gap: 0.5rem;
    }
    .nav-links.show {
        display: flex;
    }
    .nav-links a {
        padding: 0.75rem 1rem;
    }
    .user-profile-item {
        margin-left: 0;
        justify-content: center;
        text-align: center;
        padding: 0.6rem;
    }
    .user-profile-name {
        max-width: 100%;
    }
    .viewer-frame-box {
        height: 500px;
    }
}

@media (max-width: 576px) {
    .brand {
        gap: 0.5rem;
    }
    .brand-logo-container {
        padding: 3px 6px;
    }
    .brand-logo-img {
        height: 32px;
        max-width: 125px;
    }
    .brand-name {
        display: none;
    }
    .brand-badge {
        font-size: 0.68rem;
        padding: 0.15rem 0.4rem;
    }
    h1 { font-size: 1.5rem; }
    h2 { font-size: 1.3rem; }
    .metric-val { font-size: 2rem; }
    .card { padding: 1rem; }
    .btn { width: 100%; }
    .viewer-frame-box { height: 400px; }
    .footer-inner { flex-direction: column; text-align: center; }
}