/* ================================
   MONOCHROME E-PAPER DESIGN
   Warm Yellowish Professional Interface
   ================================ */

/* Reset and Base */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Monochrome Warm Paper Palette - Light Mode */
    --paper-cream: #fef6e4;
    --paper-white: #fffffe;
    --paper-beige: #f8f3e6;
    --paper-tan: #f0ebe0;
    --paper-sand: #e8e3d8;

    /* Monochrome ink colors */
    --ink-black: #1a1a1a;
    --ink-dark: #2d2d2d;
    --ink-gray: #5a5a5a;
    --ink-light: #8a8a8a;
    --ink-lighter: #b0b0b0;

    /* Minimal accent - just for interactive elements */
    --accent-primary: #3a3a3a;
    --accent-hover: #4a4a4a;
    --accent-active: #000000;

    /* Borders and shadows */
    --border-color: #d4d1c9;
    --border-dark: #b8b5ad;
    --shadow-sm: 0 1px 3px rgba(26, 26, 26, 0.08);
    --shadow-md: 0 3px 10px rgba(26, 26, 26, 0.12);
    --shadow-lg: 0 6px 20px rgba(26, 26, 26, 0.15);

    /* Layout */
    --sidebar-width: 240px;
    --border-radius: 12px;
    --border-radius-sm: 8px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="dark"] {
    /* Dark Mode - Warm Monochrome */
    --paper-cream: #1a1917;
    --paper-white: #242220;
    --paper-beige: #2d2b28;
    --paper-tan: #363430;
    --paper-sand: #3f3d38;

    --ink-black: #e8e6e1;
    --ink-dark: #d8d6d1;
    --ink-gray: #b8b5ad;
    --ink-light: #8a8984;
    --ink-lighter: #6a6864;

    --accent-primary: #d8d6d1;
    --accent-hover: #e8e6e1;
    --accent-active: #ffffff;

    --border-color: #3a3835;
    --border-dark: #4a4845;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 3px 10px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 6px 20px rgba(0, 0, 0, 0.5);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Inter', 'SF Pro Display', system-ui, sans-serif;
    background: var(--paper-cream);
    color: var(--ink-black);
    font-size: 15px;
    line-height: 1.6;
    transition: var(--transition);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Auth Page */
.auth-page {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background: var(--paper-cream);
    position: relative;
}

.auth-container {
    width: 100%;
    max-width: 480px;
    padding: 24px;
}

.auth-card {
    background: var(--paper-white);
    border-radius: var(--border-radius);
    border: 2px solid var(--border-color);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

.auth-header {
    text-align: center;
    padding: 48px 32px 32px;
    background: var(--paper-beige);
    color: var(--ink-black);
    border-bottom: 2px solid var(--border-color);
}

.auth-header h1 {
    font-size: 36px;
    font-weight: 800;
    margin-bottom: 8px;
    letter-spacing: -0.5px;
    color: var(--ink-black);
}

.auth-header p {
    color: var(--ink-gray);
    font-size: 15px;
}

.auth-tabs {
    display: flex;
    border-bottom: 2px solid var(--border-color);
    background: var(--paper-sand);
}

.tab-btn {
    flex: 1;
    padding: 18px;
    border: none;
    background: transparent;
    cursor: pointer;
    font-size: 15px;
    font-weight: 700;
    color: var(--ink-light);
    transition: var(--transition);
    position: relative;
}

.tab-btn.active {
    color: var(--ink-black);
    background: var(--paper-white);
}

.tab-btn.active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--ink-black);
}

.auth-form {
    padding: 32px;
    background: var(--paper-white);
}

/* Form Elements */
.form-group {
    margin-bottom: 24px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 700;
    font-size: 14px;
    color: var(--ink-black);
    letter-spacing: 0.3px;
}

input[type="text"],
input[type="email"],
input[type="password"],
input[type="url"],
input[type="number"],
select,
textarea {
    width: 100%;
    padding: 12px 14px;
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    font-size: 14px;
    transition: var(--transition);
    background: var(--paper-beige);
    color: var(--ink-black);
    font-family: inherit;
    font-weight: 500;
}

input::placeholder,
textarea::placeholder {
    color: var(--ink-light);
}

input:focus,
select:focus,
textarea:focus {
    outline: none;
    border-color: var(--ink-black);
    background: var(--paper-white);
    box-shadow: 0 0 0 3px rgba(26, 26, 26, 0.08);
}

textarea {
    resize: vertical;
    min-height: 120px;
}

select {
    cursor: pointer;
}

/* Buttons */
.btn {
    padding: 11px 20px;
    border: 2px solid var(--border-dark);
    border-radius: var(--border-radius-sm);
    font-size: 13px;
    font-weight: 700;
    cursor: pointer;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 8px;
    text-decoration: none;
    background: var(--paper-white);
    color: var(--ink-black);
    box-shadow: var(--shadow-sm);
    letter-spacing: 0.3px;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    background: var(--paper-beige);
}

.btn:active {
    transform: translateY(0);
}

.btn-primary {
    background: var(--ink-black);
    color: var(--paper-white);
    border-color: var(--ink-black);
}

.btn-primary:hover {
    background: var(--ink-dark);
    border-color: var(--ink-dark);
}

.btn-success {
    background: var(--ink-dark);
    color: var(--paper-white);
    border-color: var(--ink-dark);
}

.btn-success:hover {
    background: var(--ink-black);
}

.btn-danger {
    background: var(--ink-gray);
    color: var(--paper-white);
    border-color: var(--ink-gray);
}

.btn-danger:hover {
    background: var(--ink-dark);
}

.btn-secondary {
    background: var(--paper-beige);
    color: var(--ink-black);
    border-color: var(--border-dark);
}

.btn-secondary:hover {
    background: var(--paper-sand);
}

.btn-info {
    background: var(--ink-light);
    color: var(--paper-white);
    border-color: var(--ink-light);
}

.btn-info:hover {
    background: var(--ink-gray);
}

.btn-block {
    width: 100%;
    justify-content: center;
}

.btn-sm {
    padding: 9px 14px;
    font-size: 12px;
}

/* App Layout */
.app-container {
    display: flex;
    min-height: 100vh;
}

/* Sidebar */
.sidebar {
    width: var(--sidebar-width);
    background: var(--paper-white);
    color: var(--ink-black);
    display: flex;
    flex-direction: column;
    position: fixed;
    height: 100vh;
    min-height: 100vh;
    overflow: hidden;
    transition: var(--transition);
    border-right: 3px solid var(--border-color);
    box-shadow: var(--shadow-md);
}

.sidebar-header {
    padding: 24px 20px;
    border-bottom: 3px solid var(--border-color);
    background: var(--paper-beige);
}

.sidebar-header h2 {
    font-size: 22px;
    font-weight: 900;
    letter-spacing: -1px;
    color: var(--ink-black);
}

.sidebar-nav {
    flex: 1;
    padding: 12px 0;
    overflow-y: auto;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 11px 18px;
    margin: 3px 10px;
    color: var(--ink-gray);
    text-decoration: none;
    transition: var(--transition);
    border-radius: var(--border-radius-sm);
    font-weight: 600;
    font-size: 13px;
    border-left: 3px solid transparent;
}

.nav-item:hover {
    background: var(--paper-beige);
    color: var(--ink-black);
    border-left-color: var(--ink-gray);
}

.nav-item.active {
    background: var(--paper-tan);
    color: var(--ink-black);
    border-left-color: var(--ink-black);
    font-weight: 800;
}

.nav-item .icon {
    font-size: 16px;
    width: 18px;
    text-align: center;
    filter: grayscale(100%) contrast(1.5) brightness(0.3);
    opacity: 0.7;
}

.nav-item.active .icon {
    opacity: 1;
    filter: grayscale(100%) contrast(1.5) brightness(0);
}

.sidebar-footer {
    padding: 16px 20px;
    border-top: 3px solid var(--border-color);
    background: var(--paper-beige);
    flex-shrink: 0;
}

.user-info {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.user-name {
    font-size: 14px;
    font-weight: 700;
    color: var(--ink-black);
}

.logout-btn {
    color: var(--ink-gray);
    text-decoration: none;
    font-size: 13px;
    transition: var(--transition);
    padding: 8px 14px;
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    font-weight: 600;
    background: var(--paper-white);
}

.logout-btn:hover {
    color: var(--ink-black);
    border-color: var(--ink-gray);
    background: var(--paper-sand);
}

/* Main Content */
.main-content {
    flex: 1;
    margin-left: var(--sidebar-width);
    padding: 28px;
    min-height: 100vh;
}

/* Page Header */
.page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
}

.page-header h1 {
    font-size: 28px;
    font-weight: 900;
    color: var(--ink-black);
    letter-spacing: -1px;
}

/* Cards */
.card {
    background: var(--paper-white);
    border-radius: var(--border-radius);
    border: 2px solid var(--border-color);
    padding: 24px;
    margin-bottom: 22px;
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
}

.card:hover {
    box-shadow: var(--shadow-md);
    border-color: var(--border-dark);
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 18px;
    padding-bottom: 14px;
    border-bottom: 2px solid var(--border-color);
}

.card-title {
    font-size: 18px;
    font-weight: 800;
    letter-spacing: -0.5px;
    color: var(--ink-black);
}

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 16px;
    margin-bottom: 24px;
}

.stat-card {
    background: var(--paper-beige);
    padding: 18px 20px;
    border-radius: 6px;
    border: 2px solid var(--ink-black);
    transition: all 0.2s ease;
    position: relative;
    box-shadow: 2px 2px 0 rgba(26, 26, 26, 0.1);
}

.stat-card::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--ink-black);
    opacity: 1;
}

.stat-card:hover {
    transform: translateX(1px) translateY(1px);
    box-shadow: 1px 1px 0 rgba(26, 26, 26, 0.1);
}

.stat-card.success {
    background: #f5f5f0;
    border-color: #2d2d2d;
}

.stat-card.success::after {
    background: #2d2d2d;
}

.stat-card.warning {
    background: #f8f6f0;
    border-color: #5a5a5a;
}

.stat-card.warning::after {
    background: #5a5a5a;
}

.stat-card.danger {
    background: #f9f7f3;
    border-color: #8a8a8a;
}

.stat-card.danger::after {
    background: #8a8a8a;
}

.stat-card.info {
    background: #f3f3ed;
    border-color: #1a1a1a;
}

.stat-card.info::after {
    background: #1a1a1a;
}

.stat-label {
    font-size: 10px;
    color: var(--ink-gray);
    text-transform: uppercase;
    letter-spacing: 1.5px;
    margin-bottom: 10px;
    font-weight: 600;
    display: block;
}

.stat-value {
    font-size: 32px;
    font-weight: 800;
    color: var(--ink-black);
    letter-spacing: -1px;
    line-height: 1.1;
    font-variant-numeric: tabular-nums;
    word-break: break-word;
    overflow-wrap: break-word;
    max-width: 100%;
}

.stat-change {
    font-size: 11px;
    margin-top: 8px;
    font-weight: 600;
    color: var(--ink-gray);
}

.stat-change.positive {
    color: var(--ink-dark);
}

.stat-change.positive::before {
    content: '↑ ';
}

.stat-change.negative {
    color: var(--ink-light);
}

.stat-change.negative::before {
    content: '↓ ';
}

/* Table */
.table-container {
    overflow-x: auto;
    border-radius: var(--border-radius);
    border: 2px solid var(--border-color);
}

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

thead {
    background: var(--paper-beige);
}

th {
    padding: 18px 20px;
    text-align: left;
    font-weight: 800;
    font-size: 11px;
    color: var(--ink-gray);
    text-transform: uppercase;
    letter-spacing: 1.5px;
    border-bottom: 2px solid var(--border-color);
}

td {
    padding: 20px;
    border-bottom: 1px solid var(--border-color);
    font-size: 14px;
    color: var(--ink-black);
    font-weight: 500;
}

tr {
    transition: var(--transition);
    background: var(--paper-white);
}

tr:hover {
    background: var(--paper-beige);
}

/* URL Code styling */
.url-code {
    background: var(--paper-beige);
    padding: 8px 14px;
    border-radius: var(--border-radius-sm);
    font-size: 12px;
    font-family: 'SF Mono', 'Monaco', 'Courier New', monospace;
    color: var(--ink-dark);
    border: 1px solid var(--border-color);
    max-width: 300px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    display: inline-block;
    font-weight: 600;
}

/* Badges */
.badge {
    display: inline-block;
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.5px;
    border: 2px solid var(--border-color);
    background: var(--paper-beige);
    color: var(--ink-black);
}

.badge-primary {
    background: var(--ink-black);
    color: var(--paper-white);
    border-color: var(--ink-black);
}

.badge-success {
    background: var(--ink-dark);
    color: var(--paper-white);
    border-color: var(--ink-dark);
}

.badge-warning {
    background: var(--ink-gray);
    color: var(--paper-white);
    border-color: var(--ink-gray);
}

.badge-danger {
    background: var(--ink-light);
    color: var(--ink-black);
    border-color: var(--ink-light);
}

.badge-secondary {
    background: var(--paper-beige);
    color: var(--ink-gray);
    border-color: var(--border-color);
}

/* Alerts */
.alert {
    padding: 18px 24px;
    border-radius: var(--border-radius);
    margin-bottom: 24px;
    font-size: 14px;
    border: 2px solid var(--border-color);
    background: var(--paper-white);
    font-weight: 600;
    border-left: 6px solid var(--ink-gray);
    color: var(--ink-black);
}

.alert-success {
    background: var(--paper-beige);
    border-left-color: var(--ink-dark);
}

.alert-error {
    background: var(--paper-tan);
    border-left-color: var(--ink-light);
}

.alert-info {
    background: var(--paper-sand);
    border-left-color: var(--ink-black);
}

/* Modal */
.modal-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(26, 26, 26, 0.7);
    z-index: 1000;
    align-items: center;
    justify-content: center;
}

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

.modal {
    background: var(--paper-white);
    border-radius: var(--border-radius);
    max-width: 640px;
    width: 90%;
    max-height: 90vh;
    overflow: hidden;
    border: 3px solid var(--border-dark);
    box-shadow: var(--shadow-lg);
    transition: var(--transition);
    display: flex;
    flex-direction: column;
}

.modal-header {
    padding: 32px;
    border-bottom: 3px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--paper-beige);
    flex-shrink: 0;
}

.modal-title {
    font-size: 24px;
    font-weight: 800;
    letter-spacing: -0.5px;
    color: var(--ink-black);
}

.modal-close {
    background: var(--paper-white);
    border: 2px solid var(--border-color);
    font-size: 24px;
    cursor: pointer;
    color: var(--ink-gray);
    transition: var(--transition);
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    font-weight: 700;
}

.modal-close:hover {
    background: var(--ink-black);
    color: var(--paper-white);
    border-color: var(--ink-black);
    transform: rotate(90deg);
}

.modal-body {
    padding: 32px;
    overflow-y: auto;
    flex: 1;
    max-height: calc(90vh - 200px);
}

.modal-footer {
    padding: 24px 32px;
    border-top: 3px solid var(--border-color);
    display: flex;
    justify-content: flex-end;
    gap: 12px;
    background: var(--paper-beige);
    flex-shrink: 0;
}

/* Flow Builder Canvas */
.flow-builder {
    background: var(--paper-beige);
    border: 3px dashed var(--border-dark);
    border-radius: var(--border-radius);
    min-height: 500px;
    position: relative;
    padding: 16px;
}

.flow-node {
    position: absolute;
    background: var(--paper-white);
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    padding: 16px;
    min-width: 180px;
    cursor: grab;
    transition: box-shadow 0.2s ease, border-color 0.2s ease;
    box-shadow: var(--shadow-sm);
    user-select: none;
    -webkit-user-select: none;
}

.flow-node:active {
    cursor: grabbing;
}

.flow-node:hover {
    border-color: var(--border-dark);
    box-shadow: var(--shadow-md);
}

.flow-node.campaign {
    border-left: 5px solid var(--ink-black);
    background: var(--paper-tan);
}

.flow-node.lander {
    border-left: 5px solid var(--ink-dark);
    background: var(--paper-sand);
}

.flow-node.offer {
    border-left: 5px solid var(--ink-gray);
    background: var(--paper-beige);
}

.flow-node.split-lander,
.flow-node.split-offer {
    border: 3px solid var(--ink-gray);
    background: var(--paper-white);
    min-width: 280px;
    box-shadow: var(--shadow-md);
}

.flow-node.split-lander:hover,
.flow-node.split-offer:hover {
    border-color: var(--ink-black);
}

.flow-node-header {
    font-weight: 800;
    margin-bottom: 8px;
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--ink-black);
    cursor: grab;
    user-select: none;
}

.flow-node-header:active {
    cursor: grabbing;
}

.flow-node-body {
    font-size: 13px;
    color: var(--ink-gray);
    font-weight: 500;
}

.flow-connector {
    position: absolute;
    width: 14px;
    height: 14px;
    background: var(--ink-black);
    border: 2px solid var(--paper-white);
    border-radius: 50%;
    cursor: crosshair;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    z-index: 100;
    pointer-events: auto;
}

.flow-connector:hover {
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.3);
}

.flow-connector.input {
    left: -8px;
    top: 50%;
    transform: translateY(-50%);
}

.flow-connector.input:hover {
    transform: translateY(-50%) scale(1.3);
}

.flow-connector.output {
    right: -8px;
    top: 50%;
    transform: translateY(-50%);
}

.flow-connector.output:hover {
    transform: translateY(-50%) scale(1.3);
}

/* Copy Button */
.copy-btn {
    background: var(--ink-black);
    border: 2px solid var(--ink-black);
    padding: 10px 14px;
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    font-size: 16px;
    transition: var(--transition);
    color: var(--paper-white);
    box-shadow: var(--shadow-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 40px;
    font-weight: 700;
}

.copy-btn:hover {
    background: var(--ink-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.copy-btn:active {
    transform: translateY(0);
}

/* Loading Spinner */
.spinner {
    border: 3px solid var(--border-color);
    border-top: 3px solid var(--ink-black);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
    margin: 24px auto;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Action buttons in tables */
.action-btns {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.icon-btn {
    background: var(--paper-white);
    border: 2px solid var(--border-color);
    padding: 10px 14px;
    cursor: pointer;
    border-radius: var(--border-radius-sm);
    transition: var(--transition);
    font-size: 16px;
    box-shadow: var(--shadow-sm);
    font-weight: 700;
}

.icon-btn:hover {
    background: var(--paper-beige);
    border-color: var(--ink-gray);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* Form row */
.form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 24px;
}

/* Weight slider for splits */
.weight-control {
    display: flex;
    align-items: center;
    gap: 12px;
}

.weight-control input[type="range"] {
    flex: 1;
}

.weight-value {
    font-weight: 800;
    min-width: 48px;
    color: var(--ink-black);
}

/* Theme Toggle */
.theme-toggle {
    background: var(--paper-white);
    border: 2px solid var(--border-color);
    color: var(--ink-black);
    cursor: pointer;
    font-size: 15px;
    padding: 10px 14px;
    width: 100%;
    text-align: left;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: var(--transition);
    margin-bottom: 12px;
    border-radius: var(--border-radius-sm);
    font-weight: 700;
}

.theme-toggle:hover {
    background: var(--paper-beige);
    border-color: var(--ink-gray);
}

/* ================================
   MOBILE RESPONSIVE DESIGN
   ================================ */

/* Mobile Hamburger Menu */
.mobile-menu-toggle {
    display: none;
    position: fixed;
    top: 16px;
    left: 16px;
    z-index: 1001;
    background: var(--paper-white);
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    padding: 12px;
    cursor: pointer;
    box-shadow: var(--shadow-md);
    width: 48px;
    height: 48px;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 5px;
}

.mobile-menu-toggle span {
    display: block;
    width: 24px;
    height: 3px;
    background: var(--ink-black);
    border-radius: 2px;
    transition: all 0.3s ease;
}

.mobile-menu-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(7px, 7px);
}

.mobile-menu-toggle.active span:nth-child(2) {
    opacity: 0;
}

.mobile-menu-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(6px, -6px);
}

/* Mobile Overlay */
.mobile-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(26, 26, 26, 0.7);
    z-index: 999;
}

.mobile-overlay.active {
    display: block;
}

/* Tablet Responsive (768px - 1024px) */
@media (max-width: 1024px) {
    :root {
        --sidebar-width: 200px;
    }

    .sidebar-header h2 {
        font-size: 18px;
    }

    .nav-item {
        font-size: 12px;
        padding: 10px 14px;
    }

    .main-content {
        padding: 20px;
    }

    .stats-grid {
        grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
        gap: 12px;
    }

    .stat-card {
        padding: 16px 18px;
    }

    .stat-value {
        font-size: 28px;
    }

    .modal {
        max-width: 90%;
    }

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

/* Mobile Landscape & Small Tablets (481px - 768px) */
@media (max-width: 768px) {
    /* Show mobile menu toggle */
    .mobile-menu-toggle {
        display: flex;
    }

    /* Hide sidebar by default on mobile */
    .sidebar {
        transform: translateX(-100%);
        z-index: 1000;
        transition: transform 0.3s ease;
    }

    /* Show sidebar when active */
    .sidebar.mobile-active {
        transform: translateX(0);
    }

    /* Adjust main content */
    .main-content {
        margin-left: 0;
        padding: 20px 16px;
        padding-top: 72px; /* Space for hamburger menu */
    }

    /* Stats grid - 2 columns */
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 10px;
    }

    .stat-card {
        padding: 14px 16px;
    }

    .stat-label {
        font-size: 9px;
        letter-spacing: 1px;
    }

    .stat-value {
        font-size: 24px;
    }

    .stat-change {
        font-size: 10px;
    }

    /* Page header */
    .page-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 12px;
    }

    .page-header h1 {
        font-size: 24px;
    }

    /* Tables - horizontal scroll */
    .table-container {
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }

    table {
        min-width: 600px;
    }

    th, td {
        padding: 12px 10px;
        font-size: 13px;
    }

    /* Buttons */
    .btn {
        padding: 12px 18px;
        font-size: 14px;
        min-height: 44px; /* Touch target */
    }

    .btn-sm {
        padding: 10px 14px;
        font-size: 13px;
        min-height: 40px;
    }

    .action-btns {
        flex-direction: column;
        gap: 6px;
    }

    .icon-btn {
        padding: 12px 16px;
        min-height: 44px;
        min-width: 44px;
    }

    /* Modals */
    .modal {
        max-width: 95%;
        width: 95%;
        margin: 16px;
        max-height: 85vh;
    }

    .modal-header {
        padding: 20px;
    }

    .modal-title {
        font-size: 20px;
    }

    .modal-body {
        padding: 20px;
        max-height: calc(85vh - 160px);
    }

    .modal-footer {
        padding: 16px 20px;
        flex-direction: column;
        gap: 8px;
    }

    .modal-footer .btn {
        width: 100%;
    }

    /* Forms */
    .form-row {
        grid-template-columns: 1fr;
        gap: 16px;
    }

    .form-group {
        margin-bottom: 20px;
    }

    input[type="text"],
    input[type="email"],
    input[type="password"],
    input[type="url"],
    input[type="number"],
    select,
    textarea {
        padding: 14px 16px;
        font-size: 16px; /* Prevents zoom on iOS */
        min-height: 44px;
    }

    /* Cards */
    .card {
        padding: 18px;
        margin-bottom: 16px;
    }

    .card-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 12px;
    }

    /* URL codes */
    .url-code {
        max-width: 100%;
        font-size: 11px;
        padding: 6px 10px;
    }

    /* Badges */
    .badge {
        padding: 6px 12px;
        font-size: 11px;
    }

    /* Toast notifications */
    .toast-container {
        top: 80px; /* Below hamburger menu */
        right: 10px;
        left: 10px;
    }

    .toast {
        min-width: auto;
        max-width: 100%;
    }

    /* Auth page */
    .auth-container {
        padding: 16px;
    }

    .auth-header {
        padding: 32px 20px 20px;
    }

    .auth-header h1 {
        font-size: 28px;
    }

    .auth-form {
        padding: 20px;
    }

    /* Flow builder */
    .flow-builder {
        min-height: 400px;
        padding: 12px;
    }

    .flow-node {
        min-width: 140px;
        padding: 12px;
        font-size: 12px;
    }

    /* Sidebar adjustments for mobile */
    .sidebar-header {
        padding: 20px 16px;
    }

    .sidebar-footer {
        padding: 14px 16px;
    }

    .theme-toggle {
        font-size: 14px;
        padding: 10px 12px;
    }

    .user-name {
        font-size: 13px;
    }

    .logout-btn {
        font-size: 12px;
        padding: 8px 12px;
    }
}

/* Mobile Portrait (320px - 480px) */
@media (max-width: 480px) {
    .main-content {
        padding: 16px 12px;
        padding-top: 68px;
    }

    /* Stats grid - single column on very small screens */
    .stats-grid {
        grid-template-columns: 1fr;
    }

    .stat-card {
        padding: 16px;
    }

    .stat-value {
        font-size: 28px;
        word-break: break-all;
    }

    /* Page header */
    .page-header h1 {
        font-size: 22px;
    }

    /* Tables - show important columns only hint */
    th:not(:first-child):not(:nth-child(2)):not(:last-child),
    td:not(:first-child):not(:nth-child(2)):not(:last-child) {
        /* Let all columns scroll horizontally */
    }

    /* Modals full screen */
    .modal {
        max-width: 100%;
        width: 100%;
        margin: 0;
        border-radius: 0;
        max-height: 100vh;
        height: 100vh;
    }

    .modal-body {
        max-height: calc(100vh - 180px);
    }

    /* Buttons full width */
    .btn-block {
        width: 100%;
    }

    .page-header .btn {
        width: 100%;
    }

    /* Copy buttons */
    .copy-btn {
        padding: 12px;
        min-width: 44px;
        min-height: 44px;
    }

    /* Form labels */
    .form-group label {
        font-size: 13px;
    }

    /* Card titles */
    .card-title {
        font-size: 16px;
    }

    /* Table minimum width */
    table {
        min-width: 500px;
    }

    th, td {
        padding: 10px 8px;
        font-size: 12px;
    }

    /* Toast messages smaller */
    .toast-message {
        font-size: 13px;
    }

    .toast-icon {
        width: 28px;
        height: 28px;
        font-size: 16px;
    }

    /* Auth adjustments */
    .auth-header h1 {
        font-size: 24px;
    }

    .auth-header p {
        font-size: 14px;
    }

    .tab-btn {
        padding: 14px;
        font-size: 14px;
    }

    /* Flow builder touch optimization */
    .flow-node {
        touch-action: none; /* Better drag on mobile */
    }

    .flow-connector {
        width: 18px;
        height: 18px;
    }
}

/* Landscape phones */
@media (max-width: 812px) and (orientation: landscape) {
    .main-content {
        padding-top: 68px;
    }

    .stats-grid {
        grid-template-columns: repeat(3, 1fr);
    }

    .modal {
        max-height: 95vh;
    }

    .modal-body {
        max-height: calc(95vh - 140px);
    }
}

/* Extra small devices (very old phones) */
@media (max-width: 360px) {
    .stat-value {
        font-size: 24px;
    }

    .page-header h1 {
        font-size: 20px;
    }

    .btn {
        font-size: 13px;
        padding: 10px 14px;
    }

    table {
        min-width: 450px;
    }

    th, td {
        font-size: 11px;
        padding: 8px 6px;
    }
}

/* Scrollbar styling */
::-webkit-scrollbar {
    width: 12px;
}

::-webkit-scrollbar-track {
    background: var(--paper-beige);
    border-left: 1px solid var(--border-color);
}

::-webkit-scrollbar-thumb {
    background: var(--ink-gray);
    border-radius: 6px;
    border: 2px solid var(--paper-beige);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--ink-dark);
}

/* Selection styling */
::selection {
    background: var(--ink-black);
    color: var(--paper-white);
}

/* Focus visible for accessibility */
:focus-visible {
    outline: 3px solid var(--ink-black);
    outline-offset: 2px;
}

/* Smooth transitions */
* {
    transition: background-color 0.3s ease, border-color 0.3s ease, color 0.3s ease, box-shadow 0.3s ease;
}

/* Code blocks */
code {
    background: var(--paper-beige);
    padding: 4px 8px;
    border-radius: var(--border-radius-sm);
    font-family: 'SF Mono', 'Monaco', 'Courier New', monospace;
    font-size: 0.9em;
    color: var(--ink-dark);
    border: 1px solid var(--border-color);
    font-weight: 600;
}

pre {
    background: var(--paper-beige);
    padding: 16px;
    border-radius: var(--border-radius-sm);
    overflow-x: auto;
    border: 2px solid var(--border-color);
}

pre code {
    background: none;
    padding: 0;
    border: none;
}

/* Monochrome Icons - Full grayscale */
.nav-item .icon,
.icon-btn,
button[type="button"],
.stat-card::before {
    filter: grayscale(100%) contrast(1.5);
}

.nav-item .icon {
    opacity: 0.7;
}

.nav-item.active .icon {
    opacity: 1;
    filter: grayscale(100%) contrast(2) brightness(0);
}

.nav-item:hover .icon {
    opacity: 0.9;
}

/* ================================
   TOAST NOTIFICATIONS
   ================================ */

.toast-container {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 10000;
    display: flex;
    flex-direction: column;
    gap: 12px;
    pointer-events: none;
}

.toast {
    background: var(--paper-white);
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    padding: 16px 20px;
    min-width: 320px;
    max-width: 400px;
    box-shadow: var(--shadow-lg);
    display: flex;
    align-items: center;
    gap: 12px;
    opacity: 0;
    transform: translateX(400px);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    pointer-events: auto;
}

.toast-show {
    opacity: 1;
    transform: translateX(0);
}

.toast-hide {
    opacity: 0;
    transform: translateX(400px);
}

.toast-icon {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    font-weight: 700;
    flex-shrink: 0;
}

.toast-message {
    flex: 1;
    font-size: 14px;
    font-weight: 600;
    color: var(--ink-dark);
    line-height: 1.4;
}

.toast-close {
    background: none;
    border: none;
    font-size: 24px;
    font-weight: 700;
    color: var(--ink-light);
    cursor: pointer;
    padding: 0;
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 4px;
    transition: var(--transition);
    flex-shrink: 0;
}

.toast-close:hover {
    background: var(--paper-beige);
    color: var(--ink-black);
}

/* Toast Types */
.toast-success {
    border-left: 5px solid var(--ink-black);
}

.toast-success .toast-icon {
    background: var(--ink-black);
    color: var(--paper-white);
}

.toast-error {
    border-left: 5px solid #8a3a3a;
}

.toast-error .toast-icon {
    background: #8a3a3a;
    color: var(--paper-white);
}

.toast-warning {
    border-left: 5px solid #8a7a3a;
}

.toast-warning .toast-icon {
    background: #8a7a3a;
    color: var(--paper-white);
}

.toast-info {
    border-left: 5px solid var(--ink-gray);
}

.toast-info .toast-icon {
    background: var(--ink-gray);
    color: var(--paper-white);
}

/* Dark mode adjustments */
[data-theme="dark"] .toast {
    background: var(--paper-white);
    border-color: var(--border-dark);
}

[data-theme="dark"] .toast-close:hover {
    background: var(--paper-beige);
}

/* Clickable Tokens */
.clickable-token {
    cursor: pointer;
    transition: all 0.2s ease;
    display: inline-block;
    padding: 2px 6px;
    border-radius: 4px;
    background: var(--paper-tan);
    border: 1px solid var(--border-color);
}

.clickable-token:hover {
    background: var(--ink-black);
    color: var(--paper-white);
    border-color: var(--ink-black);
    transform: translateY(-1px);
}

.clickable-token:active {
    transform: translateY(0);
}