:root {
    --bg: #0f1117;
    --surface: #1a1d27;
    --surface-hover: #232736;
    --border: #2a2e3d;
    --text: #e4e6ed;
    --text-muted: #8b8fa3;
    --primary: #4f8ff7;
    --primary-hover: #3a7de6;
    --success: #34d399;
    --danger: #f87171;
    --warning: #fbbf24;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 20px;
}

header {
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    padding: 16px 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: 6px;
    text-decoration: none;
    cursor: pointer;
}

.logo-icon {
    width: 24px;
    height: 24px;
    flex-shrink: 0;
    transition: transform 0.2s;
}

.logo-text {
    font-size: 1rem;
    font-weight: 700;
    letter-spacing: -0.3px;
}

.logo-text .logo-e {
    color: #fff;
}

.logo-text .logo-t {
    color: var(--primary);
}

.logo:hover .logo-text .logo-e {
    color: var(--primary);
}

.logo:hover .logo-icon {
    transform: scale(1.08);
}

nav { display: flex; gap: 8px; }

nav button {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text-muted);
    padding: 8px 16px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.875rem;
    transition: all 0.2s;
}

nav button:hover,
nav button.active {
    background: var(--primary);
    color: #fff;
    border-color: var(--primary);
}

/* Header right group */
.header-right {
    display: flex;
    align-items: center;
    gap: 10px;
}

.header-user {
    color: var(--text-muted);
    font-size: 0.85rem;
}

/* Hamburger button — hidden on desktop */
.menu-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 4px;
    width: 28px;
    height: 28px;
    background: none;
    border: 1px solid var(--border);
    border-radius: 4px;
    padding: 5px;
    cursor: pointer;
}

.menu-toggle span {
    display: block;
    width: 100%;
    height: 2px;
    background: var(--text-muted);
    border-radius: 1px;
    transition: all 0.2s;
}

.menu-toggle.menu-open span:nth-child(1) {
    transform: rotate(45deg) translate(3px, 3px);
}
.menu-toggle.menu-open span:nth-child(2) {
    opacity: 0;
}
.menu-toggle.menu-open span:nth-child(3) {
    transform: rotate(-45deg) translate(4px, -4px);
}

main { padding: 24px 0; }

.panel {
    display: none;
    animation: fadeIn 0.3s ease;
}

.panel.active { display: block; }

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(8px); }
    to { opacity: 1; transform: translateY(0); }
}

.card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 24px;
    margin-bottom: 20px;
}

.card h2 {
    font-size: 1.1rem;
    margin-bottom: 16px;
    color: var(--text);
}

.grid { display: grid; gap: 20px; }
.grid-2 { grid-template-columns: 1fr 1fr; }
.grid-3 { grid-template-columns: 1fr 1fr 1fr; }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

@media (max-width: 768px) {
    .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }

    /* Header: logo left, user+hamburger right, nav dropdown */
    header { padding: 10px 0; }

    header .container {
        flex-wrap: wrap;
        gap: 0;
    }

    .header-right {
        margin-left: auto;
    }

    .menu-toggle {
        display: flex;
    }

    nav {
        display: none;
        width: 100%;
        flex-direction: column;
        gap: 4px;
        padding-top: 10px;
    }

    nav.nav-open {
        display: flex;
    }

    nav button {
        width: 100%;
        padding: 10px 14px;
        font-size: 0.85rem;
        text-align: left;
        border-radius: 6px;
    }

    /* Container padding */
    .container { padding: 0 12px; }

    /* Main content */
    main { padding: 12px 0; }

    /* Cards */
    .card {
        padding: 16px;
        margin-bottom: 12px;
        border-radius: 8px;
    }

    .card h2 {
        font-size: 1rem;
        margin-bottom: 12px;
    }

    /* Form rows: stack on mobile */
    .form-row {
        flex-wrap: wrap;
        gap: 8px;
    }

    .form-row > * {
        min-width: 0;
    }

    .form-row input,
    .form-row select,
    .form-row .btn {
        flex: 1 1 100%;
    }

    /* Keep short inputs side by side */
    .form-row input[style*="width: 80px"],
    .form-row input[style*="width: 100px"],
    .form-row input[style*="width:80px"],
    .form-row input[style*="width:100px"] {
        flex: 0 0 auto;
    }

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

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

    /* Stat cards */
    .stat-card { padding: 14px 10px; }
    .stat-value { font-size: 1.3rem; }
    .stat-label { font-size: 0.7rem; }

    /* Charts */
    .chart-container { height: 280px; }

    /* Inputs & buttons */
    input, select {
        padding: 9px 12px;
        font-size: 0.85rem;
    }

    .btn {
        padding: 9px 14px;
        font-size: 0.85rem;
    }

    /* Toast */
    .toast {
        left: 12px;
        right: 12px;
        bottom: 12px;
        text-align: center;
    }

    /* Dividend info grid */
    .div-info-grid {
        grid-template-columns: 1fr;
    }

    /* Stock chips */
    .stock-list { gap: 6px; }
    .stock-chip {
        font-size: 0.8rem;
        padding: 4px 10px;
    }

    /* Auth pages */
    .auth-card {
        padding: 24px 20px;
    }

    /* Empty state */
    .empty-state { padding: 30px 16px; }

    /* Roadmap save row and card headers */
    .card > div[style*="justify-content: space-between"] {
        flex-wrap: wrap;
        gap: 8px;
    }

    /* Portfolio card layout */
    .card > div[style*="justify-content: space-between"] > div[style*="display: flex; gap: 8px"] {
        flex-wrap: wrap;
        width: 100%;
    }

    .card > div[style*="justify-content: space-between"] > div[style*="display: flex; gap: 8px"] .btn-sm {
        flex: 1 1 auto;
    }
}

/* Small phones */
@media (max-width: 420px) {
    nav button {
        padding: 5px 6px;
        font-size: 0.7rem;
    }

    .logo-text { font-size: 0.9rem; }
    .logo-icon { width: 20px; height: 20px; }

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

    .card { padding: 12px; }

    .chart-container { height: 220px; }
}

.form-row {
    display: flex;
    gap: 10px;
    margin-bottom: 12px;
}

input, select {
    background: var(--bg);
    border: 1px solid var(--border);
    color: var(--text);
    padding: 10px 14px;
    border-radius: 6px;
    font-size: 0.9rem;
    flex: 1;
}

input:focus, select:focus {
    outline: none;
    border-color: var(--primary);
}

button {
    font-family: inherit;
    cursor: pointer;
}

.btn {
    background: var(--primary);
    color: #fff;
    border: none;
    padding: 10px 20px;
    border-radius: 6px;
    font-size: 0.9rem;
    font-weight: 500;
    transition: background 0.2s;
}

.btn:hover { background: var(--primary-hover); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }

.btn-sm {
    padding: 6px 12px;
    font-size: 0.8rem;
}

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

.btn-danger:hover {
    background: #e05555;
}

.btn-outline {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text-muted);
}

.btn-outline:hover {
    border-color: var(--primary);
    color: var(--primary);
}

.stat-card {
    text-align: center;
    padding: 20px;
}

.stat-value {
    font-size: 1.8rem;
    font-weight: 700;
    margin-bottom: 4px;
}

.stat-label {
    font-size: 0.8rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.positive { color: var(--success); }
.negative { color: var(--danger); }
.neutral { color: var(--warning); }

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

th, td {
    padding: 10px 14px;
    text-align: left;
    border-bottom: 1px solid var(--border);
    font-size: 0.875rem;
}

th {
    color: var(--text-muted);
    font-weight: 500;
    text-transform: uppercase;
    font-size: 0.75rem;
    letter-spacing: 0.5px;
}

tr:hover { background: var(--surface-hover); }

.chart-container {
    position: relative;
    height: 400px;
    margin-top: 16px;
}

.loading {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 40px;
    color: var(--text-muted);
}

.spinner {
    width: 24px;
    height: 24px;
    border: 3px solid var(--border);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin-right: 12px;
}

@keyframes spin { to { transform: rotate(360deg); } }

.tag {
    display: inline-block;
    padding: 3px 10px;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 500;
}

.tag-blue { background: rgba(79, 143, 247, 0.15); color: var(--primary); }
.tag-green { background: rgba(52, 211, 153, 0.15); color: var(--success); }
.tag-red { background: rgba(248, 113, 113, 0.15); color: var(--danger); }

.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-muted);
}

.empty-state h3 {
    margin-bottom: 8px;
    color: var(--text);
}

.stock-list {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 12px;
}

.stock-chip {
    display: flex;
    align-items: center;
    gap: 6px;
    background: var(--bg);
    border: 1px solid var(--border);
    padding: 6px 12px;
    border-radius: 20px;
    font-size: 0.85rem;
}

.stock-chip .remove {
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    font-size: 1rem;
    line-height: 1;
    padding: 0;
}

.stock-chip .remove:hover { color: var(--danger); }

.period-selector {
    display: flex;
    gap: 4px;
}

.period-selector button {
    background: var(--bg);
    border: 1px solid var(--border);
    color: var(--text-muted);
    padding: 4px 10px;
    border-radius: 4px;
    font-size: 0.75rem;
    cursor: pointer;
}

.period-selector button.active {
    background: var(--primary);
    color: #fff;
    border-color: var(--primary);
}

.toast {
    position: fixed;
    bottom: 24px;
    right: 24px;
    background: var(--surface);
    border: 1px solid var(--border);
    padding: 12px 20px;
    border-radius: 8px;
    font-size: 0.875rem;
    z-index: 1000;
    animation: slideUp 0.3s ease;
}

.toast.error { border-color: var(--danger); }
.toast.success { border-color: var(--success); }

@keyframes slideUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

/* --- Regression controls --- */
.regression-controls {
    display: flex;
    gap: 12px;
    align-items: flex-end;
    flex-wrap: wrap;
}

.reg-field {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.reg-field label {
    font-size: 0.75rem;
    color: var(--text-muted);
    font-weight: 500;
}

.reg-field select,
.reg-field input {
    flex: none;
    width: 100px;
}

.reg-field-btn {
    margin-left: auto;
}

.reg-field-btn .btn {
    white-space: nowrap;
}

@media (max-width: 768px) {
    .regression-controls {
        gap: 8px;
    }

    .reg-field {
        flex: 1 1 calc(50% - 4px);
    }

    .reg-field select,
    .reg-field input {
        width: 100%;
    }

    .reg-field-btn {
        flex: 1 1 100%;
        margin-left: 0;
    }

    .reg-field-btn .btn {
        width: 100%;
    }
}

/* --- Dividend capture --- */
.div-disclaimer {
    background: rgba(251, 191, 36, 0.08);
    border: 1px solid rgba(251, 191, 36, 0.3);
    border-radius: 6px;
    padding: 12px 16px;
    font-size: 0.8rem;
    color: var(--warning);
    line-height: 1.5;
}

.roadmap-buy {
    color: var(--success);
    font-weight: 600;
}

.roadmap-sell {
    color: var(--danger);
    font-weight: 600;
}

.roadmap-ex {
    color: var(--warning);
    font-weight: 600;
}

.div-info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 10px;
    margin-top: 8px;
}

.div-info-item {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 10px 14px;
}

.div-info-item .label {
    font-size: 0.7rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.3px;
}

.div-info-item .value {
    font-size: 1rem;
    font-weight: 600;
    margin-top: 2px;
}

.roadmap-row-buy { border-left: 3px solid var(--success); }
.roadmap-row-hold { border-left: 3px solid var(--warning); }
.roadmap-row-sell { border-left: 3px solid var(--danger); }

.freq-tag {
    display: inline-block;
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
}

.freq-monthly { background: rgba(79, 143, 247, 0.15); color: var(--primary); }
.freq-quarterly { background: rgba(52, 211, 153, 0.15); color: var(--success); }
.freq-semi-annual { background: rgba(251, 191, 36, 0.15); color: var(--warning); }
.freq-annual { background: rgba(248, 113, 113, 0.15); color: var(--danger); }