/* Modern CSS Variables for cohesive dark slate styling */
:root {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --accent-blue: #3b82f6;
    --accent-blue-hover: #2563eb;
    --accent-green: #10b981;
    --accent-red: #ef4444;
    --border-color: #475569;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.5;
    min-height: 100vh;
    padding-bottom: 40px;
}

/* Auth views & wrapper */
.view {
    display: none;
    opacity: 0;
    transition: opacity 0.35s ease-in-out;
}

.view.active-view {
    display: block;
    opacity: 1;
}

/* Center card for Login and Loading views when active */
.view.active-view.center-container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 80vh;
    padding: 20px;
}

.auth-card {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 32px;
    width: 100%;
    max-width: 420px;
    box-shadow: var(--shadow-lg);
    text-align: center;
}

.auth-card h2 {
    margin-bottom: 24px;
    font-weight: 700;
    font-size: 1.8rem;
    background: linear-gradient(135deg, #60a5fa, #3b82f6);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.auth-card input {
    display: block;
    width: 100%;
    padding: 12px 16px;
    margin-bottom: 16px;
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 1rem;
    transition: border-color 0.2s;
}

.auth-card input:focus {
    outline: none;
    border-color: var(--accent-blue);
}

.auth-card button {
    width: 100%;
    padding: 12px;
    background-color: var(--accent-blue);
    color: #ffffff;
    font-weight: 600;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 1rem;
    transition: background-color 0.2s;
}

.auth-card button:hover {
    background-color: var(--accent-blue-hover);
}

.auth-error {
    color: var(--accent-red);
    margin-top: 12px;
    font-size: 0.9rem;
}

/* Header design */
.app-header {
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    padding: 16px 24px;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow-md);
}

.header-container {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 16px;
}

.header-logo {
    font-size: 1.4rem;
    font-weight: 800;
    background: linear-gradient(to right, #60a5fa, #3b82f6);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.header-right {
    display: flex;
    align-items: center;
    gap: 16px;
    flex-wrap: wrap;
}

.user-email {
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 500;
}

.status-pill {
    display: inline-flex;
    align-items: center;
    padding: 4px 12px;
    border-radius: 9999px;
    font-size: 0.8rem;
    font-weight: 600;
    border: 1px solid transparent;
}

.status-pill.connected {
    background-color: rgba(16, 185, 129, 0.1);
    color: var(--accent-green);
    border-color: rgba(16, 185, 129, 0.3);
}

.status-pill.disconnected {
    background-color: rgba(239, 68, 68, 0.1);
    color: var(--accent-red);
    border-color: rgba(239, 68, 68, 0.3);
}

.btn-header {
    padding: 8px 16px;
    border-radius: 6px;
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    border: 1px solid var(--border-color);
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
    transition: all 0.2s;
}

.btn-header:hover {
    background-color: var(--border-color);
}

.btn-connect {
    background-color: var(--accent-blue);
    border-color: var(--accent-blue);
    color: white;
}

.btn-connect:hover {
    background-color: var(--accent-blue-hover);
}

.btn-disconnect {
    background-color: rgba(239, 68, 68, 0.15);
    border-color: var(--accent-red);
    color: var(--accent-red);
}

.btn-disconnect:hover {
    background-color: var(--accent-red);
    color: white;
}

/* Dashboard views */
.dashboard-container {
    max-width: 1400px;
    margin: 32px auto;
    padding: 0 24px;
}

/* Summary Grid layout */
.summary-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
    margin-bottom: 32px;
}

.summary-card {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    padding: 20px;
    box-shadow: var(--shadow-md);
}

.summary-card h4 {
    color: var(--text-secondary);
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 12px;
}

.summary-value {
    font-size: 1.8rem;
    font-weight: 750;
    margin-bottom: 6px;
}

.summary-subtext {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.summary-subtext strong {
    color: var(--text-primary);
}

.todo-list-pills {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-top: 8px;
}

.todo-pill {
    background-color: rgba(251, 191, 36, 0.15);
    color: #fbbf24;
    border: 1px solid rgba(251, 191, 36, 0.3);
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 600;
}

/* Tables Section styling */
.section-card {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 24px;
    margin-bottom: 32px;
    box-shadow: var(--shadow-md);
    overflow: hidden;
}

.section-header-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    flex-wrap: wrap;
    gap: 16px;
}

.section-card h3 {
    font-size: 1.25rem;
    font-weight: 700;
}

/* Custom dropdown or switcher */
.btn-action-refresh {
    background-color: var(--accent-blue);
    border: none;
    color: white;
    padding: 8px 16px;
    border-radius: 6px;
    font-weight: 600;
    cursor: pointer;
    font-size: 0.9rem;
    transition: background-color 0.2s;
}

.btn-action-refresh:hover {
    background-color: var(--accent-blue-hover);
}

/* Group-by toggle button */
.btn-toggle {
    background: transparent;
    border: 1.5px solid var(--border-color);
    color: var(--text-secondary);
    padding: 6px 13px;
    border-radius: 6px;
    font-size: 0.82rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 5px;
    transition: border-color 0.2s, color 0.2s, background 0.2s;
    white-space: nowrap;
}

.btn-toggle:hover {
    border-color: var(--accent-blue);
    color: var(--accent-blue);
}

.btn-toggle.active {
    background: rgba(96, 165, 250, 0.12);
    border-color: var(--accent-blue);
    color: var(--accent-blue);
}

/* Separator row injected between underlying groups */
.group-header-row td {
    background: rgba(96, 165, 250, 0.07);
    color: var(--accent-blue);
    font-weight: 700;
    font-size: 0.78rem;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    padding: 5px 12px;
    border-top: 1px solid rgba(96, 165, 250, 0.25);
}

/* Responsive Table Wrapper */
.table-responsive {
    width: 100%;
    overflow-x: auto;
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

table {
    width: 100%;
    border-collapse: collapse;
    text-align: left;
    font-size: 0.9rem;
}

th {
    background-color: rgba(71, 85, 105, 0.4);
    color: var(--text-primary);
    font-weight: 600;
    padding: 12px 16px;
    border-bottom: 2px solid var(--border-color);
    white-space: nowrap;
}

td {
    padding: 12px 16px;
    border-bottom: 1px solid var(--border-color);
    white-space: nowrap;
    color: var(--text-primary);
}

tr:last-child td {
    border-bottom: none;
}

tr:hover td {
    background-color: rgba(71, 85, 105, 0.15);
}

.val-positive {
    color: var(--accent-green);
    font-weight: 600;
}

.val-negative {
    color: var(--accent-red);
    font-weight: 600;
}

.badge-underlying {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
    padding: 2px 6px;
    border-radius: 4px;
    font-weight: 700;
    font-size: 0.8rem;
}

.badge-option {
    background-color: rgba(59, 130, 246, 0.15);
    color: #93c5fd;
    border: 1px solid rgba(59, 130, 246, 0.3);
    padding: 2px 6px;
    border-radius: 4px;
    font-family: monospace;
    font-size: 0.8rem;
}

/* Empty UI placeholder */
.no-data-msg {
    text-align: center;
    padding: 48px;
    color: var(--text-secondary);
    font-size: 1rem;
}

.no-data-msg p {
    margin-bottom: 16px;
}

/* Risk indicator colors */
.risk-low {
    color: var(--accent-green);
}
.risk-med {
    color: #fbbf24;
}
.risk-high {
    color: var(--accent-red);
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0% { opacity: 1; }
    50% { opacity: 0.5; }
    100% { opacity: 1; }
}

/* Header Navigation & Tabs */
.header-left {
    display: flex;
    align-items: center;
    gap: 24px;
}

.header-nav {
    display: flex;
    align-items: center;
    gap: 6px;
    background: rgba(15, 23, 42, 0.6);
    padding: 3px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.nav-tab {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    padding: 6px 16px;
    border-radius: 6px;
    font-size: 0.88rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
}

.nav-tab:hover {
    color: var(--text-primary);
}

.nav-tab.active {
    background: var(--accent-blue);
    color: #ffffff;
    box-shadow: 0 2px 8px rgba(59, 130, 246, 0.4);
}

/* Tab Content Visibility */
.tab-content {
    display: none;
}

.tab-content.active-tab-content {
    display: block;
}

/* Option Chain Filter Bar */
.chain-filter-bar {
    display: flex;
    flex-wrap: wrap;
    align-items: flex-end;
    gap: 12px;
    background: var(--bg-tertiary);
    padding: 12px 16px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.filter-group {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.filter-group label {
    font-size: 0.72rem;
    font-weight: 700;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.filter-group input,
.filter-group select {
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    color: var(--text-primary);
    padding: 5px 8px;
    font-size: 0.82rem;
    font-weight: 500;
    height: 30px;
    box-sizing: border-box;
    transition: border-color 0.2s;
}

.filter-group input[type="number"] {
    width: 65px;
}

.filter-group input[type="text"] {
    width: 95px;
}

.filter-group select {
    width: 135px;
    max-width: 135px;
    padding: 5px 8px;
}

.filter-group input:focus,
.filter-group select:focus {
    outline: none;
    border-color: var(--accent-blue);
}

.filter-actions {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-left: auto;
}

.filter-actions button {
    padding: 5px 14px;
    font-size: 0.82rem;
    height: 30px;
    border-radius: 6px;
}

/* Quick Symbol Presets */
.quick-presets {
    display: flex;
    align-items: center;
    gap: 6px;
}

.preset-btn {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 3px 9px;
    border-radius: 4px;
    font-size: 0.78rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.15s;
}

.preset-btn:hover {
    border-color: var(--accent-blue);
    color: var(--accent-blue);
    background: rgba(96, 165, 250, 0.1);
}

/* Underlying Banner */
.underlying-banner {
    background: linear-gradient(135deg, rgba(30, 41, 59, 0.8), rgba(15, 23, 42, 0.9));
    border: 1px solid var(--border-color);
    border-radius: 10px;
    padding: 16px 20px;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 16px;
}

.underlying-title {
    font-size: 1.3rem;
    font-weight: 800;
    color: var(--text-primary);
}

.underlying-stats {
    display: flex;
    align-items: center;
    gap: 24px;
}

.underlying-stat {
    display: flex;
    flex-direction: column;
}

.underlying-stat-label {
    font-size: 0.72rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    font-weight: 700;
}

.underlying-stat-value {
    font-size: 1.1rem;
    font-weight: 700;
}

/* Call / Put Badges */
.badge-call {
    background-color: rgba(16, 185, 129, 0.15);
    color: var(--accent-green);
    border: 1px solid rgba(16, 185, 129, 0.3);
    padding: 2px 6px;
    border-radius: 4px;
    font-weight: 700;
    font-size: 0.75rem;
}

.badge-put {
    background-color: rgba(239, 68, 68, 0.15);
    color: var(--accent-red);
    border: 1px solid rgba(239, 68, 68, 0.3);
    padding: 2px 6px;
    border-radius: 4px;
    font-weight: 700;
    font-size: 0.75rem;
}

/* DTE Group Visual Elements */
.dte-group-row td {
    background: linear-gradient(90deg, rgba(30, 41, 59, 0.95), rgba(15, 23, 42, 0.85)) !important;
    padding: 8px 14px !important;
    border-top: 2px solid var(--accent-blue) !important;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08) !important;
}

.dte-header-content {
    display: flex;
    align-items: center;
    gap: 12px;
}

.dte-group-pill {
    background: var(--accent-blue);
    color: #ffffff;
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 0.78rem;
    font-weight: 800;
    letter-spacing: 0.03em;
    box-shadow: 0 1px 4px rgba(59, 130, 246, 0.3);
}

.dte-group-date {
    font-size: 0.82rem;
    color: var(--text-primary);
}

.dte-pill {
    background: rgba(96, 165, 250, 0.12);
    color: #93c5fd;
    border: 1px solid rgba(96, 165, 250, 0.25);
    padding: 2px 8px;
    border-radius: 999px;
    font-weight: 700;
    font-size: 0.8rem;
}

.dte-bg-group-0 {
    background-color: rgba(15, 23, 42, 0.3);
}

.dte-bg-group-1 {
    background-color: rgba(30, 41, 59, 0.25);
}

/* =====================================================================================
   MOBILE RESPONSIVE BREAKPOINTS (Tablet & Mobile Devices)
   ===================================================================================== */

@media (max-width: 768px) {
    body {
        padding-bottom: 24px;
    }

    .app-header {
        padding: 12px 16px;
    }

    .header-container {
        flex-direction: column;
        align-items: stretch;
        gap: 12px;
    }

    .header-left {
        justify-content: space-between;
        width: 100%;
        gap: 12px;
    }

    .header-logo {
        font-size: 1.2rem;
    }

    .header-nav {
        flex: 1;
        justify-content: flex-end;
    }

    .nav-tab {
        padding: 5px 12px;
        font-size: 0.82rem;
    }

    .header-right {
        justify-content: space-between;
        width: 100%;
        gap: 10px;
        font-size: 0.8rem;
    }

    .dashboard-container {
        margin: 16px auto;
        padding: 0 12px;
    }

    .summary-grid {
        grid-template-columns: 1fr;
        gap: 16px;
        margin-bottom: 20px;
    }

    .section-card {
        padding: 16px 12px;
        margin-bottom: 20px;
    }

    .section-header-row {
        flex-direction: column;
        align-items: flex-start;
        gap: 10px;
    }

    /* Option Chain Filter Bar Mobile Layout */
    .chain-filter-bar {
        display: grid;
        grid-template-columns: repeat(3, 1fr);
        gap: 10px 8px;
        padding: 12px;
    }

    .filter-group input[type="number"],
    .filter-group input[type="text"],
    .filter-group select {
        width: 100% !important;
        max-width: 100% !important;
    }

    .filter-actions {
        grid-column: 1 / -1;
        justify-content: flex-end;
        width: 100%;
        margin-left: 0;
        margin-top: 4px;
    }

    .quick-presets {
        flex-wrap: wrap;
        gap: 4px;
    }

    .underlying-banner {
        flex-direction: column;
        align-items: flex-start;
        gap: 10px;
        padding: 12px 14px;
    }

    .underlying-title {
        font-size: 1.1rem;
    }

    .underlying-stats {
        width: 100%;
        justify-content: space-between;
    }

    /* Tables horizontal scroll touch optimization */
    .table-responsive {
        -webkit-overflow-scrolling: touch;
    }

    th, td {
        padding: 10px 8px;
        font-size: 0.8rem;
    }
}

@media (max-width: 480px) {
    .chain-filter-bar {
        grid-template-columns: repeat(2, 1fr);
    }

    .user-email {
        display: none; /* Hide email on very small screens to save space */
    }

    .btn-header {
        padding: 4px 10px;
        font-size: 0.78rem;
    }

    th, td {
        padding: 8px 6px;
        font-size: 0.75rem;
    }
}

/* ============================================================
   TRANSACTIONS TAB
   ============================================================ */

/* Stats bar */
.txn-stats-bar {
    display: flex;
    gap: 32px;
    margin-top: 16px;
    padding-top: 14px;
    border-top: 1px solid var(--border-color);
    flex-wrap: wrap;
}

.txn-stat {
    display: flex;
    flex-direction: column;
    gap: 3px;
}

.txn-stat-label {
    font-size: 0.72rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.txn-stat-value {
    font-size: 1rem;
    font-weight: 700;
    color: var(--text-primary);
}

/* Sync status inline message */
.txn-sync-status {
    font-size: 0.82rem;
    font-weight: 500;
    padding: 4px 10px;
    border-radius: 6px;
    transition: background 0.2s, color 0.2s;
}

.txn-sync-ok {
    color: var(--accent-green);
    background: rgba(16, 185, 129, 0.1);
}

.txn-sync-err {
    color: var(--accent-red);
    background: rgba(239, 68, 68, 0.1);
}

/* Type badges */
.txn-badge {
    display: inline-block;
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    background: var(--bg-tertiary);
    color: var(--text-secondary);
}

.txn-badge-trade {
    background: rgba(59, 130, 246, 0.15);
    color: #60a5fa;
}

.txn-badge-dividend {
    background: rgba(16, 185, 129, 0.15);
    color: #34d399;
}

.txn-badge-assignment {
    background: rgba(245, 158, 11, 0.15);
    color: #fbbf24;
}

/* Position effect coloring */
.txn-effect-open {
    color: var(--accent-blue);
}

.txn-effect-close {
    color: var(--accent-green);
}