/* ==========================================================================
   IRIS BULK MAIL - DESIGN SYSTEM STYLESHEET
   Lightweight • Clean Light Theme • Professional • Simple • Modern SaaS
   ========================================================================== */

:root {
    /* Design Tokens */
    --color-bg: #F8FAFC;
    --color-surface: #FFFFFF;
    --color-surface-hover: #F1F5F9;
    --color-border: #E2E8F0;
    --color-border-subtle: #F1F5F9;
    
    --color-text-main: #1E293B;
    --color-text-muted: #64748B;
    --color-text-light: #94A3B8;

    --color-primary: #2563EB;
    --color-primary-hover: #1D4ED8;
    --color-primary-subtle: #EFF6FF;
    --color-primary-border: #BFDBFE;

    --color-success: #16A34A;
    --color-success-subtle: #F0FDF4;
    --color-success-border: #BBF7D0;

    --color-warning: #D97706;
    --color-warning-subtle: #FFFBEB;
    --color-warning-border: #FDE68A;

    --color-danger: #DC2626;
    --color-danger-subtle: #FEF2F2;
    --color-danger-border: #FECACA;

    --color-info: #0891B2;
    --color-info-subtle: #ECFEFF;
    --color-info-border: #A5F3FC;

    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-pill: 9999px;

    --shadow-subtle: 0 1px 3px 0 rgba(0, 0, 0, 0.04), 0 1px 2px -1px rgba(0, 0, 0, 0.04);
    --shadow-card: 0 1px 3px 0 rgba(15, 23, 42, 0.05), 0 1px 2px 0 rgba(15, 23, 42, 0.03);
    --shadow-dropdown: 0 10px 15px -3px rgba(15, 23, 42, 0.08), 0 4px 6px -4px rgba(15, 23, 42, 0.04);
}

/* Base Document */
html, body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background-color: var(--color-bg);
    color: var(--color-text-main);
    -webkit-font-smoothing: antialiased;
    font-size: 14px;
    line-height: 1.5;
}

/* Discreet Scrollbar */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}
::-webkit-scrollbar-track {
    background: transparent;
}
::-webkit-scrollbar-thumb {
    background: #CBD5E1;
    border-radius: 9999px;
}
::-webkit-scrollbar-thumb:hover {
    background: #94A3B8;
}

/* ==========================================================================
   APP SHELL LAYOUT: Fixed 240px Sidebar + 64px White Top Header
   ========================================================================== */
#wrapper {
    display: flex;
    min-height: 100vh;
    width: 100%;
}

/* Sidebar */
#sidebar {
    width: 240px !important;
    min-width: 240px !important;
    max-width: 240px !important;
    flex-shrink: 0 !important;
    height: 100vh;
    position: sticky;
    top: 0;
    background-color: var(--color-surface) !important;
    border-right: 1px solid var(--color-border) !important;
    display: flex !important;
    flex-direction: column !important;
    z-index: 1030;
    transition: transform 0.2s ease-in-out, margin-left 0.2s ease-in-out;
}

#sidebar .sidebar-brand {
    height: 64px;
    min-height: 64px;
    padding: 0 20px;
    border-bottom: 1px solid var(--color-border);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

#sidebar .sidebar-menu {
    flex-grow: 1;
    overflow-y: auto;
    padding: 16px 12px;
}

#sidebar .sidebar-section-title {
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--color-text-muted);
    padding: 12px 10px 4px;
    margin: 0;
}

/* Navigation List & Links */
#sidebar ul.nav {
    display: flex;
    flex-direction: column;
    padding: 0;
    margin: 0;
    list-style: none;
    gap: 2px;
}

#sidebar .nav-link {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 8px 12px;
    color: var(--color-text-main);
    font-size: 13.5px;
    font-weight: 500;
    text-decoration: none;
    border-radius: var(--radius-md);
    transition: background-color 0.15s ease, color 0.15s ease;
    border-left: 3px solid transparent;
}

#sidebar .nav-link .nav-item-left {
    display: flex;
    align-items: center;
    gap: 10px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

#sidebar .nav-link .nav-item-right {
    display: flex;
    align-items: center;
    gap: 6px;
    flex-shrink: 0;
}

#sidebar .nav-link .nav-icon {
    font-size: 15px;
    width: 18px;
    text-align: center;
    color: var(--color-text-muted);
    transition: color 0.15s ease;
}

#sidebar .nav-link:hover {
    background-color: var(--color-surface-hover);
    color: var(--color-primary);
}
#sidebar .nav-link:hover .nav-icon {
    color: var(--color-primary);
}

/* Active Navigation Item */
#sidebar .nav-link.active {
    background-color: var(--color-primary-subtle) !important;
    color: var(--color-primary) !important;
    font-weight: 600;
    border-left-color: var(--color-primary);
}
#sidebar .nav-link.active .nav-icon {
    color: var(--color-primary) !important;
}

/* Subtle Counter Badge */
.nav-badge-neutral {
    background-color: var(--color-surface-hover);
    color: var(--color-text-muted);
    font-size: 11px;
    font-weight: 600;
    padding: 1px 6px;
    border-radius: var(--radius-pill);
    border: 1px solid var(--color-border);
}
.nav-badge-active {
    background-color: var(--color-primary);
    color: #FFFFFF;
    font-size: 11px;
    font-weight: 600;
    padding: 1px 6px;
    border-radius: var(--radius-pill);
}

/* Sidebar Footer Profile */
.sidebar-footer {
    padding: 14px 16px;
    border-top: 1px solid var(--color-border);
    background-color: var(--color-surface);
}

/* ==========================================================================
   TOP HEADER: Clean White, Lightweight, Height 64px
   ========================================================================== */
#headerBar {
    height: 64px;
    min-height: 64px;
    background-color: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 24px;
    position: sticky;
    top: 0;
    z-index: 1020;
}

.header-search {
    position: relative;
    width: 260px;
}
.header-search input {
    background-color: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 7px 12px 7px 34px;
    font-size: 13px;
    color: var(--color-text-main);
    width: 100%;
    transition: border-color 0.15s ease, background-color 0.15s ease;
}
.header-search input:focus {
    background-color: var(--color-surface);
    border-color: var(--color-primary);
    outline: none;
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.12);
}
.header-search .search-icon {
    position: absolute;
    left: 11px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--color-text-muted);
    font-size: 13px;
    pointer-events: none;
}

.header-action-btn {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-md);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text-muted);
    background-color: transparent;
    border: 1px solid transparent;
    transition: all 0.15s ease;
    text-decoration: none;
}
.header-action-btn:hover {
    background-color: var(--color-surface-hover);
    color: var(--color-text-main);
    border-color: var(--color-border);
}

/* User Avatar & Dropdown */
.user-avatar {
    width: 34px;
    height: 34px;
    border-radius: var(--radius-pill);
    background-color: var(--color-primary-subtle);
    color: var(--color-primary);
    font-weight: 600;
    font-size: 13px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--color-primary-border);
}

/* Main Content Area */
#mainContent {
    flex-grow: 1;
    background-color: var(--color-bg);
    padding: 24px;
    max-width: 1400px;
    margin: 0 auto;
    width: 100%;
}

/* ==========================================================================
   CARDS: Clean White Surfaces with Subtle Borders (No heavy shadows)
   ========================================================================== */
.card {
    background-color: var(--color-surface) !important;
    border: 1px solid var(--color-border) !important;
    border-radius: var(--radius-lg) !important;
    box-shadow: var(--shadow-card) !important;
    margin-bottom: 20px;
}

.card-header {
    background-color: var(--color-surface) !important;
    border-bottom: 1px solid var(--color-border) !important;
    padding: 16px 20px !important;
}

.card-body {
    padding: 20px !important;
}

/* Dashboard Metric Stat Cards */
.metric-card {
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 20px;
    height: 100%;
    transition: border-color 0.15s ease;
}
.metric-card:hover {
    border-color: #CBD5E1;
}

.metric-card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 8px;
}
.metric-card-label {
    font-size: 13px;
    font-weight: 500;
    color: var(--color-text-muted);
}
.metric-card-icon {
    width: 32px;
    height: 32px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 15px;
}

.metric-card-value {
    font-size: 26px;
    font-weight: 700;
    color: var(--color-text-main);
    line-height: 1.2;
    margin-bottom: 4px;
}
.metric-card-helper {
    font-size: 12px;
    color: var(--color-text-muted);
}

/* ==========================================================================
   BUTTONS: Accessible, Predictable Hierarchy
   ========================================================================== */
.btn {
    font-size: 13.5px;
    font-weight: 500;
    padding: 8px 16px;
    border-radius: var(--radius-md);
    transition: all 0.15s ease;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    height: 38px;
}

.btn-primary {
    background-color: var(--color-primary) !important;
    border-color: var(--color-primary) !important;
    color: #FFFFFF !important;
    box-shadow: 0 1px 2px 0 rgba(37, 99, 235, 0.2);
}
.btn-primary:hover {
    background-color: var(--color-primary-hover) !important;
    border-color: var(--color-primary-hover) !important;
}

.btn-secondary, .btn-outline-secondary {
    background-color: var(--color-surface) !important;
    border-color: var(--color-border) !important;
    color: var(--color-text-main) !important;
}
.btn-secondary:hover, .btn-outline-secondary:hover {
    background-color: var(--color-surface-hover) !important;
    border-color: #CBD5E1 !important;
    color: var(--color-text-main) !important;
}

.btn-sm {
    height: 32px;
    padding: 4px 12px;
    font-size: 12.5px;
}

.stat-icon-box {
    width: 38px;
    height: 38px;
    border-radius: var(--radius-md);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background-color: var(--color-primary-subtle);
    color: var(--color-primary);
    border: 1px solid var(--color-primary-border);
    flex-shrink: 0;
}

/* Reusable Cards & Panels */
.card {
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-subtle);
}
.card-header {
    background-color: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    padding: 14px 20px;
}
.card-footer {
    background-color: var(--color-surface);
    border-top: 1px solid var(--color-border);
    padding: 14px 20px;
}

/* Modals */
.modal-content {
    border: 1px solid var(--color-border);
    border-radius: 14px;
    box-shadow: var(--shadow-dropdown);
    overflow: hidden;
}
.modal-header {
    background-color: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    padding: 16px 20px;
}
.modal-footer {
    background-color: var(--color-surface);
    border-top: 1px solid var(--color-border);
    padding: 14px 20px;
}

/* Composer Tabs & Variable Tags */
.recipient-mode-tabs .nav-link {
    border-radius: var(--radius-md);
    font-size: 13px;
    font-weight: 500;
    color: var(--color-text-secondary);
    padding: 6px 12px;
    border: 1px solid var(--color-border);
    background-color: var(--color-surface);
    transition: all 0.15s ease;
}
.recipient-mode-tabs .nav-link:hover {
    color: var(--color-text-main);
    background-color: var(--color-surface-hover);
    border-color: #CBD5E1;
}
.recipient-mode-tabs .nav-link.active {
    color: #FFFFFF !important;
    background-color: var(--color-primary) !important;
    border-color: var(--color-primary) !important;
}

.tag-pill-btn {
    display: inline-flex;
    align-items: center;
    padding: 4px 10px;
    font-size: 12px;
    font-weight: 500;
    color: var(--color-text-main);
    background-color: var(--color-surface-hover);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: background-color 0.15s ease, border-color 0.15s ease;
}
.tag-pill-btn:hover {
    background-color: #E2E8F0;
    border-color: #CBD5E1;
}

/* ==========================================================================
   FORMS & INPUTS: Clean Light Borders & Focused Rings
   ========================================================================== */
.form-label {
    font-size: 13px;
    font-weight: 600;
    color: var(--color-text-main);
    margin-bottom: 6px;
}

.form-control, .form-select {
    font-size: 13.5px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 8px 12px;
    color: var(--color-text-main);
    background-color: var(--color-surface);
    transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.form-control:focus, .form-select:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.12);
    outline: none;
}

/* ==========================================================================
   TABLES: Modern, Spacious, Scannable
   ========================================================================== */
.table {
    margin-bottom: 0;
}
.table th {
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--color-text-muted);
    background-color: #FAFAFC;
    border-bottom: 1px solid var(--color-border);
    padding: 12px 16px;
    white-space: nowrap;
}
.table td {
    padding: 14px 16px;
    vertical-align: middle;
    color: var(--color-text-main);
    border-bottom: 1px solid var(--color-border);
    font-size: 13.5px;
}
.table tbody tr:hover {
    background-color: #F8FAFC;
}

/* Status Badges */
.badge-status {
    font-size: 11.5px;
    font-weight: 500;
    padding: 3px 8px;
    border-radius: var(--radius-pill);
    display: inline-flex;
    align-items: center;
    gap: 5px;
}
.badge-sent, .badge-completed {
    background-color: var(--color-success-subtle);
    color: var(--color-success);
    border: 1px solid var(--color-success-border);
}
.badge-sending, .badge-processing {
    background-color: var(--color-primary-subtle);
    color: var(--color-primary);
    border: 1px solid var(--color-primary-border);
}
.badge-pending, .badge-queued {
    background-color: var(--color-surface-hover);
    color: var(--color-text-muted);
    border: 1px solid var(--color-border);
}
.badge-paused {
    background-color: var(--color-warning-subtle);
    color: var(--color-warning);
    border: 1px solid var(--color-warning-border);
}
.badge-failed {
    background-color: var(--color-danger-subtle);
    color: var(--color-danger);
    border: 1px solid var(--color-danger-border);
}

/* ==========================================================================
   MOBILE & RESPONSIVE DRAWER
   ========================================================================== */
.sidebar-backdrop {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background-color: rgba(15, 23, 42, 0.4);
    z-index: 1025;
}

@media (max-width: 991px) {
    #sidebar {
        margin-left: -240px !important;
        position: fixed;
    }
    #sidebar.toggled {
        margin-left: 0 !important;
        box-shadow: 0 10px 25px rgba(0, 0, 0, 0.15);
    }
    .sidebar-backdrop.active {
        display: block;
    }
    #mainContent {
        padding: 16px;
    }
    #headerBar {
        padding: 0 16px;
    }
}