:root {
    --bg-color: #0d1117;
    --card-bg: #161b22;
    --border-color: #30363d;
    --text-primary: #c9d1d9;
    --text-secondary: #8b949e;
    --accent-color: #58a6ff;
    --success-color: #3fb950;
    --warning-color: #d29922;
    --error-color: #f85149;
    --font-family: 'Inter', system-ui, -apple-system, sans-serif;
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-primary);
    font-family: var(--font-family);
    line-height: 1.6;
    padding: 2rem;
    display: flex;
    justify-content: center;
}

.container {
    max-width: 900px;
    width: 100%;
}

header {
    margin-bottom: 3rem;
    text-align: center;
}

header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    letter-spacing: -1px;
    background: linear-gradient(90deg, #58a6ff, #bc8cff);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

header p {
    color: var(--text-secondary);
    margin-top: 0.5rem;
}

.card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 2rem;
    margin-bottom: 2rem;
    box-shadow: 0 4px 12px rgba(0,0,0,0.3);
}

.card-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.input-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    margin-bottom: 1.5rem;
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
}

select, input, textarea {
    background-color: #0d1117;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    color: var(--text-primary);
    padding: 0.75rem;
    font-size: 1rem;
    transition: border-color 0.2s;
    width: 100%;
}

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

textarea {
    resize: vertical;
    min-height: 80px;
    font-family: monospace;
}

.full-width {
    grid-column: 1 / -1;
}

button {
    background-color: var(--accent-color);
    color: white;
    border: none;
    border-radius: 6px;
    padding: 0.875rem 1.5rem;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: opacity 0.2s, transform 0.1s;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

button:hover {
    opacity: 0.9;
}

button:active {
    transform: scale(0.98);
}

button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

button.secondary {
    background-color: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-primary);
}

button.secondary:hover {
    background-color: var(--border-color);
}

.results-section {
    display: none; /* Hidden by default */
    transition: opacity 0.3s ease;
}

.results-section.stale {
    opacity: 0.5;
    pointer-events: none;
    position: relative;
}

.results-section.stale::after {
    content: "Parameters Changed - Re-analyze for accuracy";
    position: absolute;
    top: 10px;
    right: 20px;
    background: var(--warning-color);
    color: #000;
    padding: 4px 12px;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 700;
    box-shadow: 0 2px 10px rgba(0,0,0,0.3);
    z-index: 5;
}

/* Trust & Transparency Styles */
.model-notes-section {
    margin-bottom: 2rem;
}

.model-note-item {
    background: rgba(235, 203, 139, 0.1);
    border-left: 4px solid var(--warning-color);
    padding: 1rem;
    border-radius: 0 8px 8px 0;
    font-size: 0.9rem;
    color: var(--text-primary);
    margin-bottom: 0.75rem;
    display: flex;
    align-items: center;
}

.model-note-item::before {
    content: "ℹ️";
    margin-right: 0.75rem;
    font-size: 1.1rem;
}

.assumptions-section {
    background: rgba(45, 51, 59, 0.5);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.5rem;
    margin-top: 2rem;
}

.assumptions-section h4 {
    margin-bottom: 1rem;
    color: var(--text-secondary);
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.assumptions-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 1rem;
}

.assumption-chip {
    padding: 0.5rem 0.75rem;
    background: rgba(255, 255, 255, 0.03);
    border: 1px dashed var(--border-color);
    border-radius: 6px;
    font-size: 0.8rem;
    display: flex;
    justify-content: space-between;
}

.assumption-chip span:first-child {
    color: var(--text-secondary);
}

.assumption-chip span:last-child {
    font-weight: 600;
    color: var(--accent-color);
}

.calculation-footer {
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-top: 1rem;
    font-style: italic;
    opacity: 0.8;
}

/* Advisor Styles */
.advisor-hero {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    padding: 1.5rem;
    background: linear-gradient(135deg, rgba(88, 166, 255, 0.1) 0%, rgba(139, 148, 158, 0.05) 100%);
    border: 1px solid rgba(88, 166, 255, 0.2);
    border-radius: 12px;
}

.advisor-icon {
    font-size: 2.5rem;
    filter: drop-shadow(0 0 10px rgba(88, 166, 255, 0.3));
}

.advisor-main {
    flex: 1;
}

.advisor-main h3 {
    font-size: 1.15rem;
    color: var(--accent-color);
    margin-bottom: 0.25rem;
}

.advisor-main p {
    font-size: 0.95rem;
    color: var(--text-secondary);
}

.accent-btn {
    background: var(--accent-color);
    color: #000;
    border: none;
    padding: 0.75rem 1.25rem;
    border-radius: 6px;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.2s, background 0.2s;
    white-space: nowrap;
}

.accent-btn:hover {
    transform: translateY(-2px);
    background: #79c0ff;
}

/* Action Plan */
.action-plan {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-top: 1rem;
}

.action-item {
    display: flex;
    gap: 1rem;
    align-items: flex-start;
    padding: 1rem;
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    transition: border-color 0.2s;
}

.action-item:hover {
    border-color: var(--accent-color);
}

.action-num {
    background: var(--accent-color);
    color: #000;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.8rem;
    flex-shrink: 0;
}

.action-text {
    font-size: 0.95rem;
    color: var(--text-primary);
    line-height: 1.4;
}

/* Modal Explanation */
.explanation-modal {
    max-width: 600px;
}

.explanation-body {
    padding: 1.5rem 0;
    font-size: 1.1rem;
    line-height: 1.6;
    color: var(--text-primary);
}

/* Education Card */
.education-card {
    background: rgba(88, 166, 200, 0.05);
    border: 1px solid rgba(88, 166, 200, 0.2);
    margin-bottom: 2rem;
    padding: 1.5rem;
}

.education-text {
    font-size: 0.95rem;
    line-height: 1.5;
    color: var(--text-secondary);
}

/* Reliability Score */
.score-val {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--accent-color);
    text-align: center;
    margin: 0.5rem 0;
}

/* Premium Tables */
.premium-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 1rem;
    font-size: 0.9rem;
}

.premium-table th, .premium-table td {
    padding: 0.75rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.premium-table th {
    color: var(--text-secondary);
    font-weight: 600;
}

.premium-table td {
    color: var(--text-primary);
}

/* Scenario Highlights */
.highlight-card {
    border: 2px solid var(--accent-color) !important;
    background: rgba(186, 155, 110, 0.05) !important;
}

.summary-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 1.25rem;
    margin-top: 1rem;
}

.summary-card {
    background: rgba(48, 54, 61, 0.2);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1rem;
    text-align: center;
}

.summary-val {
    display: block;
    font-size: 1.5rem;
    font-weight: 700;
    margin-top: 0.25rem;
}

.summary-label {
    font-size: 0.75rem;
    text-transform: uppercase;
    color: var(--text-secondary);
    letter-spacing: 0.05em;
}

.context-line {
    margin-top: 1.5rem;
    font-size: 0.875rem;
    color: var(--text-secondary);
    text-align: center;
    border-top: 1px solid var(--border-color);
    padding-top: 1rem;
}

.recommendations-list {
    margin-top: 1.5rem;
    list-style: none;
}

.recommendation-item {
    background: rgba(58, 166, 255, 0.1);
    border-left: 4px solid var(--accent-color);
    padding: 1rem;
    margin-bottom: 0.75rem;
    border-radius: 0 8px 8px 0;
}

.optimization-info {
    margin-top: 1rem;
    font-style: italic;
    color: var(--text-secondary);
}

.loader {
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255,255,255,0.3);
    border-radius: 50%;
    border-top-color: #fff;
    animation: spin 1s ease-in-out infinite;
    display: none;
}

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

.error-message {
    color: var(--error-color);
    margin-top: 1rem;
    font-size: 0.875rem;
    display: none;
}

.helper-text {
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin-top: 0.5rem;
}

/* Toggle Switch Styles */
.toggle-container {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-primary);
    user-select: none;
}

.toggle-container input {
    display: none;
}

.toggle-slider {
    position: relative;
    width: 40px;
    height: 20px;
    background-color: var(--border-color);
    border-radius: 20px;
    transition: background-color 0.3s;
}

.toggle-slider::before {
    content: "";
    position: absolute;
    width: 14px;
    height: 14px;
    left: 3px;
    bottom: 3px;
    background-color: white;
    border-radius: 50%;
    transition: transform 0.3s;
}

.toggle-container input:checked + .toggle-slider {
    background-color: var(--accent-color);
}

.toggle-container input:checked + .toggle-slider::before {
    transform: translateX(20px);
}

/* Locked UI Styles */
.advanced-insights-card {
    position: relative;
    overflow: hidden;
}

.advanced-container {
    transition: filter 0.3s ease, opacity 0.3s ease;
}

.advanced-container.locked {
    filter: blur(5px);
    opacity: 0.4;
    pointer-events: none;
    user-select: none;
}

.locked-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: rgba(13, 17, 23, 0.75);
    z-index: 10;
    text-align: center;
    padding: 2rem;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
}

.locked-overlay.active {
    opacity: 1;
    pointer-events: all;
}

.locked-message {
    font-size: 1.1rem;
    font-weight: 500;
    max-width: 450px;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

.unlock-btn {
    background: linear-gradient(90deg, #58a6ff, #bc8cff);
    color: #ffffff;
    box-shadow: 0 4px 15px rgba(88, 166, 255, 0.3);
}

.unlock-btn:hover {
    box-shadow: 0 6px 20px rgba(88, 166, 255, 0.4);
    opacity: 1;
}

/* Premium Section Layout */
.premium-section h3 {
    font-size: 1.1rem;
    color: var(--text-primary);
    margin-bottom: 1rem;
    font-weight: 600;
}

.mt-2 {
    margin-top: 2rem;
}

.scenarios-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 1rem;
}

.chart-container {
    background: rgba(48, 54, 61, 0.2);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.5rem;
    height: 350px;
    position: relative;
}

/* Small Utilities */
.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1.5rem; }
.helper-text { font-size: 0.8rem; color: var(--text-secondary); margin-top: 0.5rem; }

/* Print Overrides */
@media print {
    body {
        background: white;
        color: black;
        padding: 0;
    }
    .container {
        max-width: 100%;
        width: 100%;
    }
    .card:not(.results-section .card), 
    .auth-state, 
    button, 
    #load-sample-btn, 
    #submit-btn,
    .locked-overlay,
    .modal-overlay {
        display: none !important;
    }
    .results-section {
        display: block !important;
    }
    .results-section .card {
        border: none;
        box-shadow: none;
        background: white;
        color: black;
        padding: 0;
        margin-bottom: 2rem;
        page-break-inside: avoid;
    }
    .card-title {
        color: #000;
        border-bottom: 2px solid #333;
        padding-bottom: 0.5rem;
    }
    .summary-card {
        border: 1px solid #ddd !important;
        background: #f9f9f9 !important;
        color: black !important;
    }
    .summary-val {
        color: #000 !important;
    }
    .premium-insights-card .advanced-container {
        filter: none !important;
        opacity: 1 !important;
    }
    .main-header h1 {
        -webkit-text-fill-color: black;
        background: none;
        font-size: 2rem;
    }
    .chart-container {
        background: white;
        border: 1px solid #eee;
    }
}

/* Header & Auth Layout */
.main-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 3rem;
}

.main-header .logo h1 {
    font-size: 2.5rem;
    font-weight: 700;
    letter-spacing: -1px;
    background: linear-gradient(90deg, #58a6ff, #bc8cff);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.main-header .logo p {
    color: var(--text-secondary);
    margin-top: 0.25rem;
}

/* User Display State */
#auth-state {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.user-email {
    font-size: 0.9rem;
    color: var(--text-primary);
    background: rgba(48, 54, 61, 0.4);
    padding: 0.5rem 1rem;
    border-radius: 20px;
}

/* Modal Core */
.modal-overlay {
    position: fixed;
    top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(13, 17, 23, 0.85); /* Deep dark blur */
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center; justify-content: center;
    z-index: 1000;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
}

.modal-overlay.active {
    opacity: 1;
    pointer-events: auto;
}

.modal-content {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    width: 100%;
    max-width: 420px;
    padding: 2rem;
    position: relative;
    box-shadow: 0 10px 40px rgba(0,0,0,0.5);
    transform: translateY(20px);
    transition: transform 0.3s ease;
}

.modal-overlay.active .modal-content {
    transform: translateY(0);
}

.close-btn {
    position: absolute;
    top: 1rem; right: 1rem;
    background: transparent;
    color: var(--text-secondary);
    font-size: 1.5rem;
    border: none;
    cursor: pointer;
    padding: 0;
}
.close-btn:hover { color: var(--text-primary); opacity: 1; transform: none; }

.modal-header {
    text-align: center;
    margin-bottom: 2rem;
}
.modal-header h2 { font-size: 1.5rem; color: var(--text-primary); margin-bottom: 0.5rem; }
.modal-header p { font-size: 0.9rem; color: var(--text-secondary); }

/* Tabs */
.auth-tabs {
    display: flex;
    margin-bottom: 1.5rem;
    border-bottom: 1px solid var(--border-color);
}
.tab-btn {
    flex: 1;
    background: transparent;
    color: var(--text-secondary);
    border: none;
    padding: 0.75rem 0;
    font-size: 1rem;
    font-weight: 500;
    border-bottom: 2px solid transparent;
    border-radius: 0;
}
.tab-btn.active {
    color: var(--accent-color);
    border-bottom-color: var(--accent-color);
}
.tab-btn:hover { opacity: 1; color: var(--text-primary); }

.auth-form {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.primary-auth-btn {
    width: 100%;
    margin-top: 0.5rem;
}

/* Divider */
.auth-divider {
    text-align: center;
    margin: 1.5rem 0;
    position: relative;
}
.auth-divider::before {
    content: '';
    position: absolute;
    top: 50%; left: 0; right: 0;
    border-top: 1px solid var(--border-color);
    z-index: 1;
}
.auth-divider span {
    position: relative;
    z-index: 2;
    background-color: var(--card-bg);
    padding: 0 10px;
    font-size: 0.8rem;
    color: var(--text-secondary);
}

/* Google Btn */
.google-auth-btn {
    width: 100%;
    background-color: #ffffff;
    color: #1f2937;
    border: 1px solid #d1d5db;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
}
.google-auth-btn:hover { background-color: #f9fafb; opacity: 1; transform: scale(0.98); }