/* -------------------------------------------------------------
 * Custom Design System: High-Tech Deep Blue (學術文獻探討 App)
 * ------------------------------------------------------------- */

:root {
    --bg-base: linear-gradient(135deg, #030d22 0%, #010614 50%, #000208 100%);
    --bg-surface: rgba(6, 20, 48, 0.7);
    --bg-card: rgba(8, 28, 66, 0.45);
    --border-color: rgba(0, 191, 255, 0.12);
    --border-glow: rgba(0, 191, 255, 0.3);
    
    --color-primary-rgb: 0, 191, 255; /* Neon Cyan / Sky Blue */
    --color-secondary-rgb: 0, 102, 255; /* Tech Blue */
    --color-accent-rgb: 123, 97, 255; /* Cyber Purple */
    
    --color-primary: rgb(var(--color-primary-rgb));
    --color-secondary: rgb(var(--color-secondary-rgb));
    --color-accent: rgb(var(--color-accent-rgb));
    
    --color-text-main: #e2eafc;
    --color-text-muted: #8fa0c4;
    --color-success: #00e699;
    --color-warning: #ffb300;
    --color-danger: #ff4d6d;

    --font-sans: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --font-mono: 'Fira Code', ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
    --transition-speed: 0.3s;
}

/* Reset & Core Setup */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    background: var(--bg-base);
    background-attachment: fixed;
    color: var(--color-text-main);
    font-family: var(--font-sans);
    min-height: 100vh;
    overflow-x: hidden;
    line-height: 1.6;
    position: relative;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}
::-webkit-scrollbar-track {
    background: rgba(0, 0, 0, 0.3);
}
::-webkit-scrollbar-thumb {
    background: rgba(var(--color-primary-rgb), 0.3);
    border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
    background: rgba(var(--color-primary-rgb), 0.6);
}

/* Background Particles Canvas */
#particles-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -10;
    pointer-events: none;
}

/* App Main Container */
.app-wrapper {
    display: flex;
    min-height: 100vh;
    position: relative;
    z-index: 1;
}

/* Sidebar Styling */
.sidebar {
    width: 320px;
    background: rgba(4, 15, 37, 0.85);
    border-right: 1px solid var(--border-color);
    padding: 2rem 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 2.5rem;
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    flex-shrink: 0;
}

.logo-section {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.logo-icon {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 0 15px rgba(var(--color-primary-rgb), 0.4);
}

.logo-icon svg {
    width: 24px;
    height: 24px;
    color: #fff;
}

.logo-title {
    font-size: 1.25rem;
    font-weight: 800;
    letter-spacing: 0.5px;
    background: linear-gradient(to right, #ffffff, var(--color-primary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

/* Sidebar Section Headers */
.sidebar-section-title {
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    color: var(--color-text-muted);
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

/* API Config Card */
.api-config-card {
    background: rgba(var(--color-primary-rgb), 0.05);
    border: 1px solid rgba(var(--color-primary-rgb), 0.15);
    border-radius: 12px;
    padding: 1rem;
    transition: all var(--transition-speed);
}
.api-config-card:hover {
    border-color: rgba(var(--color-primary-rgb), 0.4);
    box-shadow: 0 0 15px rgba(var(--color-primary-rgb), 0.1);
}
.api-status {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.8rem;
    margin-top: 0.5rem;
}
.status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--color-danger);
}
.status-dot.active {
    background: var(--color-success);
    box-shadow: 0 0 8px var(--color-success);
}

/* Tags Filter list */
.tags-list {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    max-height: 200px;
    overflow-y: auto;
    padding-right: 0.25rem;
}
.tag-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.6rem 0.8rem;
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid rgba(255, 255, 255, 0.04);
    cursor: pointer;
    transition: all 0.2s;
    font-size: 0.9rem;
}
.tag-item:hover, .tag-item.active {
    background: rgba(var(--color-primary-rgb), 0.12);
    border-color: rgba(var(--color-primary-rgb), 0.3);
    color: #fff;
}
.tag-count {
    font-size: 0.75rem;
    background: rgba(255, 255, 255, 0.08);
    padding: 0.1rem 0.4rem;
    border-radius: 10px;
    color: var(--color-text-muted);
}

/* Main Area Layout */
.main-content {
    flex-grow: 1;
    padding: 2rem 2.5rem;
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
    overflow-y: hidden;
    height: 100vh;
}

/* Header Area */
.app-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1.5rem;
}
.search-container {
    display: flex;
    align-items: center;
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 0.4rem 0.4rem 0.4rem 1rem;
    flex-grow: 1;
    max-width: 600px;
    transition: all var(--transition-speed);
}
.search-container:focus-within {
    border-color: var(--color-primary);
    box-shadow: 0 0 15px rgba(var(--color-primary-rgb), 0.25);
}
.search-input {
    background: transparent;
    border: none;
    outline: none;
    color: #fff;
    width: 100%;
    font-size: 0.95rem;
}
.search-input::placeholder {
    color: var(--color-text-muted);
}
.search-btn {
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    color: #fff;
    border: none;
    border-radius: 8px;
    padding: 0.6rem 1.2rem;
    cursor: pointer;
    font-weight: 600;
    transition: opacity 0.2s;
    display: flex;
    align-items: center;
    gap: 0.4rem;
}
.search-btn:hover {
    opacity: 0.9;
}

/* Buttons */
.btn-primary {
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    color: #fff;
    border: none;
    border-radius: 8px;
    padding: 0.75rem 1.5rem;
    cursor: pointer;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    transition: all 0.2s;
    box-shadow: 0 4px 15px rgba(var(--color-primary-rgb), 0.2);
}
.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(var(--color-primary-rgb), 0.4);
}
.btn-secondary {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-color);
    color: var(--color-text-main);
    border-radius: 8px;
    padding: 0.7rem 1.2rem;
    cursor: pointer;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    transition: all 0.2s;
}
.btn-secondary:hover {
    background: rgba(var(--color-primary-rgb), 0.1);
    border-color: var(--color-primary);
}
.btn-danger {
    background: rgba(var(--color-danger), 0.15);
    border: 1px solid var(--color-danger);
    color: #ff6b8b;
    border-radius: 8px;
    padding: 0.7rem 1.2rem;
    cursor: pointer;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    transition: all 0.2s;
}
.btn-danger:hover {
    background: var(--color-danger);
    color: #fff;
}

/* Controls row */
.controls-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1rem 1.5rem;
    backdrop-filter: blur(10px);
}
.actions-left, .actions-right {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}
.table-filter-info {
    font-size: 0.9rem;
    color: var(--color-text-muted);
}

/* Main Table Board */
.table-container {
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    overflow: hidden;
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
    animation: dynamic-shadow 8s infinite alternate;
}

.lit-table {
    width: 100%;
    border-collapse: collapse;
    text-align: left;
}

.lit-table th {
    background: rgba(0, 0, 0, 0.2);
    padding: 1.2rem 1rem;
    font-weight: 700;
    color: var(--color-primary);
    border-bottom: 1px solid var(--border-color);
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.lit-table td {
    padding: 1.2rem 1rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.04);
    vertical-align: top;
}

.lit-table tr {
    transition: background 0.2s;
}
.lit-table tr:hover {
    background: rgba(var(--color-primary-rgb), 0.03);
}

/* Column specific widths */
.col-cb { width: 50px; text-align: center; }
.col-title { width: 30%; }
.col-authors { width: 18%; }
.col-year { width: 80px; }
.col-citation { width: 20%; }
.col-summary { width: 22%; }

/* Checkboxes */
input[type="checkbox"] {
    appearance: none;
    -webkit-appearance: none;
    width: 18px;
    height: 18px;
    border: 2px solid var(--border-color);
    border-radius: 4px;
    background: rgba(0,0,0,0.2);
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    position: relative;
    transition: all 0.2s;
    outline: none;
}
input[type="checkbox"]:checked {
    background: var(--color-primary);
    border-color: var(--color-primary);
}
input[type="checkbox"]:checked::after {
    content: "✓";
    color: #030d22;
    font-weight: bold;
    font-size: 13px;
}

/* Abstract Foldable styling */
.paper-abstract-wrapper {
    margin-top: 0.5rem;
    font-size: 0.85rem;
    color: var(--color-text-muted);
}
.abstract-text {
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    transition: all 0.3s;
}
.abstract-text.expanded {
    display: block;
    overflow: visible;
}
.toggle-abstract-btn {
    color: var(--color-primary);
    background: none;
    border: none;
    font-size: 0.75rem;
    cursor: pointer;
    font-weight: 600;
    margin-top: 0.25rem;
    display: inline-flex;
    align-items: center;
    gap: 0.2rem;
    outline: none;
}

/* Citation panel */
.citation-box {
    position: relative;
    background: rgba(0, 0, 0, 0.25);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: 8px;
    padding: 0.75rem;
    font-size: 0.8rem;
    font-family: var(--font-mono);
    word-break: break-all;
    max-height: 120px;
    overflow-y: auto;
}
.copy-citation-btn {
    position: absolute;
    top: 5px;
    right: 5px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: var(--color-text-muted);
    border-radius: 4px;
    width: 26px;
    height: 26px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s;
}
.copy-citation-btn:hover {
    color: #fff;
    background: rgba(var(--color-primary-rgb), 0.2);
    border-color: var(--color-primary);
}

/* Tags in Table */
.item-tags-container {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
    margin-top: 0.5rem;
}
.tag-badge {
    background: rgba(var(--color-primary-rgb), 0.1);
    border: 1px solid rgba(var(--color-primary-rgb), 0.2);
    color: var(--color-primary);
    font-size: 0.75rem;
    padding: 0.15rem 0.5rem;
    border-radius: 4px;
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
}
.tag-badge.accent {
    background: rgba(var(--color-accent-rgb), 0.1);
    border: 1px solid rgba(var(--color-accent-rgb), 0.2);
    color: var(--color-accent);
}
.remove-tag-btn {
    background: none;
    border: none;
    color: inherit;
    cursor: pointer;
    font-weight: bold;
    display: flex;
    align-items: center;
}
.add-tag-inline-btn {
    background: rgba(255,255,255,0.05);
    border: 1px dashed rgba(255,255,255,0.2);
    color: var(--color-text-muted);
    font-size: 0.7rem;
    padding: 0.15rem 0.4rem;
    border-radius: 4px;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
}
.add-tag-inline-btn:hover {
    color: var(--color-primary);
    border-color: var(--color-primary);
}

/* AI Summary Block */
.ai-summary-block {
    background: rgba(var(--color-accent-rgb), 0.04);
    border: 1px dashed rgba(var(--color-accent-rgb), 0.3);
    border-radius: 10px;
    padding: 0.8rem;
    font-size: 0.85rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}
.ai-summary-block.empty {
    align-items: center;
    justify-content: center;
    padding: 1.5rem 1rem;
    border-color: rgba(255,255,255,0.1);
    background: transparent;
}
.ai-summary-title {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    color: var(--color-accent);
    font-weight: 700;
    font-size: 0.8rem;
    text-transform: uppercase;
}
.ai-summary-sentence {
    line-height: 1.4;
}
.ai-summary-sentence strong {
    color: var(--color-primary);
    display: block;
    font-size: 0.8rem;
    margin-bottom: 0.1rem;
}

/* Citation Toggle */
.citation-toggle-label {
    font-size: 0.75rem;
    color: var(--color-text-muted);
    margin-bottom: 0.25rem;
    display: block;
}

/* Empty State */
.empty-state {
    padding: 4rem 2rem;
    text-align: center;
    color: var(--color-text-muted);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}
.empty-state svg {
    width: 64px;
    height: 64px;
    color: rgba(255,255,255,0.1);
}

/* Modals */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(0, 3, 10, 0.75);
    z-index: 100;
    display: flex;
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(8px);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
}
.modal-overlay.active {
    opacity: 1;
    pointer-events: auto;
}
.modal-content {
    background: rgba(5, 18, 45, 0.95);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    width: 90%;
    max-width: 550px;
    padding: 2rem;
    box-shadow: 0 10px 40px rgba(0,0,0,0.5), 0 0 30px rgba(var(--color-primary-rgb), 0.15);
    transform: scale(0.9);
    transition: transform 0.3s ease;
    max-height: 85vh;
    overflow-y: auto;
}
.modal-overlay.active .modal-content {
    transform: scale(1);
}
.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    border-bottom: 1px solid rgba(255,255,255,0.06);
    padding-bottom: 0.75rem;
}
.modal-title {
    font-size: 1.2rem;
    font-weight: 700;
    color: #fff;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}
.modal-title svg {
    color: var(--color-primary);
}
.close-modal-btn {
    background: none;
    border: none;
    color: var(--color-text-muted);
    font-size: 1.5rem;
    cursor: pointer;
    line-height: 1;
}
.close-modal-btn:hover {
    color: #fff;
}

/* Forms in Modals */
.form-group {
    margin-bottom: 1.2rem;
}
.form-label {
    display: block;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--color-text-muted);
    margin-bottom: 0.5rem;
}
.form-control {
    width: 100%;
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 0.75rem;
    color: #fff;
    font-size: 0.9rem;
    outline: none;
    transition: border-color 0.2s;
}
.form-control:focus {
    border-color: var(--color-primary);
}
textarea.form-control {
    resize: vertical;
    min-height: 100px;
}
.form-actions {
    display: flex;
    justify-content: flex-end;
    gap: 0.75rem;
    margin-top: 2rem;
}

/* Loading skeleton or overlay */
.loading-spinner {
    width: 20px;
    height: 20px;
    border: 2px solid rgba(255, 255, 255, 0.1);
    border-top-color: var(--color-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    display: inline-block;
}
@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Toast Notifications */
.toast-container {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    z-index: 1000;
}
.toast {
    background: rgba(5, 20, 48, 0.95);
    border-left: 4px solid var(--color-primary);
    border-top: 1px solid rgba(255,255,255,0.05);
    border-right: 1px solid rgba(255,255,255,0.05);
    border-bottom: 1px solid rgba(255,255,255,0.05);
    color: #fff;
    padding: 1rem 1.5rem;
    border-radius: 8px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.3);
    display: flex;
    align-items: center;
    gap: 0.75rem;
    min-width: 280px;
    max-width: 400px;
    transform: translateY(20px);
    opacity: 0;
    animation: toast-in 0.3s forwards;
    backdrop-filter: blur(10px);
}
.toast.success { border-left-color: var(--color-success); }
.toast.warning { border-left-color: var(--color-warning); }
.toast.error { border-left-color: var(--color-danger); }
.toast.info { border-left-color: var(--color-primary); }

@keyframes toast-in {
    to {
        transform: translateY(0);
        opacity: 1;
    }
}
@keyframes toast-out {
    to {
        transform: translateY(20px);
        opacity: 0;
    }
}

/* Dynamic Shadow Pulsation for the Data Table */
@keyframes dynamic-shadow {
    0% {
        box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4), 0 0 15px rgba(var(--color-primary-rgb), 0.08);
    }
    50% {
        box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4), 0 0 25px rgba(var(--color-secondary-rgb), 0.18);
    }
    100% {
        box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4), 0 0 15px rgba(var(--color-primary-rgb), 0.08);
    }
}

/* -------------------------------------------------------------
 * 6. Responsive Adaptive UI (Mobile layout)
 * ------------------------------------------------------------- */
@media (max-width: 1024px) {
    .app-wrapper {
        flex-direction: column;
    }
    .sidebar {
        width: 100%;
        border-right: none;
        border-bottom: 1px solid var(--border-color);
        padding: 1.5rem;
    }
    .main-content {
        padding: 1.5rem;
        max-height: none;
        height: auto;
        overflow-y: auto;
    }
}

@media (max-width: 768px) {
    /* Main table converts to mobile cards */
    .table-container {
        border: none;
        background: transparent;
        box-shadow: none;
        animation: none;
    }
    .lit-table, .lit-table thead, .lit-table tbody, .lit-table th, .lit-table td, .lit-table tr {
        display: block;
    }
    .lit-table thead {
        display: none; /* Hide header on mobile */
    }
    .lit-table tr {
        background: var(--bg-surface);
        border: 1px solid var(--border-color);
        border-radius: 12px;
        margin-bottom: 1rem;
        padding: 1.2rem;
        position: relative;
    }
    .lit-table td {
        padding: 0.5rem 0;
        border: none;
        width: 100% !important;
    }
    
    /* Reformat columns for cards */
    .lit-table td.col-cb {
        position: absolute;
        top: 1.2rem;
        right: 1.2rem;
        width: auto !important;
        padding: 0;
        z-index: 10;
    }
    
    .lit-table td::before {
        content: attr(data-label);
        font-weight: 700;
        color: var(--color-primary);
        font-size: 0.75rem;
        text-transform: uppercase;
        display: block;
        margin-bottom: 0.25rem;
    }
    .lit-table td.col-cb::before {
        display: none;
    }
    
    .controls-row {
        flex-direction: column;
        align-items: stretch;
        gap: 1rem;
    }
    .actions-left, .actions-right {
        justify-content: space-between;
    }
    .app-header {
        flex-direction: column;
        align-items: stretch;
    }
    
    /* Touch target padding for mobile links and buttons */
    a, button, input[type="checkbox"], .tag-item {
        min-height: 44px;
        min-width: 44px;
    }
}

/* -------------------------------------------------------------
 * 7. Academic Search Console & Results Panel (Wizard Layout)
 * ------------------------------------------------------------- */
.academic-search-section {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 1.5rem;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    transition: all var(--transition-speed) ease;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    margin-bottom: 0.5rem;
}

.academic-search-section:focus-within {
    border-color: rgba(var(--color-primary-rgb), 0.35);
    box-shadow: 0 8px 32px rgba(var(--color-primary-rgb), 0.08), inset 0 0 15px rgba(var(--color-primary-rgb), 0.05);
}

/* Stepper Wizard Styling */
.wizard-steps-container {
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(8, 28, 66, 0.45);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 0.8rem 2rem;
    margin-bottom: 0.5rem;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.wizard-step {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    cursor: pointer;
    padding: 0.4rem 1rem;
    border-radius: 8px;
    transition: all 0.25s ease;
}

.wizard-step:hover {
    background: rgba(255, 255, 255, 0.03);
}

.wizard-step.active {
    background: rgba(0, 191, 255, 0.08);
}

.step-circle {
    width: 26px;
    height: 26px;
    border-radius: 50%;
    border: 2px solid var(--color-text-muted);
    color: var(--color-text-muted);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.8rem;
    font-weight: 800;
    transition: all 0.25s ease;
}

.wizard-step.active .step-circle {
    border-color: var(--color-primary);
    background: var(--color-primary);
    color: #030d22;
    box-shadow: 0 0 12px rgba(var(--color-primary-rgb), 0.5);
}

.step-label {
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--color-text-muted);
    transition: all 0.25s ease;
}

.wizard-step.active .step-label {
    color: #fff;
    text-shadow: 0 0 8px rgba(var(--color-primary-rgb), 0.4);
}

.wizard-step-line {
    flex-grow: 1;
    max-width: 120px;
    height: 2px;
    background: rgba(255, 255, 255, 0.06);
    margin: 0 1rem;
    transition: all 0.3s ease;
}

.wizard-step-line.active {
    background: linear-gradient(to right, var(--color-primary), var(--color-secondary));
    box-shadow: 0 0 4px var(--color-primary);
}

/* Wizard Page Panels */
.wizard-page-panel {
    display: none;
}

.wizard-page-panel.active {
    display: block;
    animation: panel-fade-in 0.4s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

/* Desktop layout constraints to lock header & controls row at top */
@media (min-width: 1025px) {
    .wizard-page-panel.active {
        display: flex;
        flex-direction: column;
        flex-grow: 1;
        min-height: 0;
    }

    #page-panel-1.active {
        /* Keep step 1 centered */
        display: block;
    }

    #page-panel-2.active {
        gap: 1rem;
    }
    #page-panel-2 .search-results-panel-inline {
        display: flex;
        flex-direction: column;
        flex-grow: 1;
        min-height: 0;
        gap: 1rem;
    }
    #page-panel-2 .search-results-table-container {
        flex-grow: 1;
        max-height: none !important;
    }

    #page-panel-3.active {
        gap: 1rem;
    }
    #page-panel-3 .table-container {
        flex-grow: 1;
        overflow-y: auto;
        min-height: 0;
    }
}

@keyframes panel-fade-in {
    from {
        opacity: 0;
        transform: translateY(12px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Search results panel styling */
.search-results-panel-inline {
    background: rgba(8, 28, 66, 0.3);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 1.5rem;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

/* Search Results Table Container Scrollbar Fix */
.search-results-table-container {
    max-height: 440px !important;
    overflow-y: auto !important;
    overflow-x: auto !important;
    scrollbar-width: thin !important;
    scrollbar-color: rgba(0, 191, 255, 0.4) rgba(0, 0, 0, 0.2) !important;
    -webkit-overflow-scrolling: touch;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    background: rgba(0, 0, 0, 0.25);
}

.search-results-table-container::-webkit-scrollbar {
    width: 8px !important;
    height: 8px !important;
    display: block !important;
}

.search-results-table-container::-webkit-scrollbar-track {
    background: rgba(0, 0, 0, 0.2) !important;
}

.search-results-table-container::-webkit-scrollbar-thumb {
    background: rgba(0, 191, 255, 0.4) !important;
    border-radius: 4px !important;
}

.search-results-table-container::-webkit-scrollbar-thumb:hover {
    background: rgba(0, 191, 255, 0.7) !important;
}

.close-panel-btn {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.04);
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid rgba(255, 255, 255, 0.06);
    color: var(--color-text-muted);
    font-size: 1.5rem;
    cursor: pointer;
    line-height: 1;
    transition: all 0.2s;
}

.close-panel-btn:hover {
    background: rgba(255, 77, 109, 0.15);
    border-color: rgba(255, 77, 109, 0.35);
    color: var(--color-danger);
}

/* Stepper Responsive behavior */
@media (max-width: 600px) {
    .wizard-steps-container {
        padding: 0.6rem 0.5rem;
    }
    .wizard-step {
        padding: 0.3rem 0.4rem;
        gap: 0.25rem;
    }
    .step-label {
        font-size: 0.75rem;
    }
    .wizard-step-line {
        margin: 0 0.3rem;
    }
}

/* Source Badges */
.source-badge {
    font-size: 0.7rem;
    padding: 0.15rem 0.4rem;
    border-radius: 4px;
    font-weight: 600;
    display: inline-block;
    vertical-align: middle;
    margin-left: 0.5rem;
}
.source-badge.badge-arxiv {
    background: rgba(179, 27, 27, 0.15);
    border: 1px solid rgba(179, 27, 27, 0.3);
    color: #ff6b6b;
}
.source-badge.badge-google-scholar {
    background: rgba(66, 133, 244, 0.15);
    border: 1px solid rgba(66, 133, 244, 0.3);
    color: #64b5f6;
}
.source-badge.badge-pubmed {
    background: rgba(0, 150, 136, 0.15);
    border: 1px solid rgba(0, 150, 136, 0.3);
    color: #4db6ac;
}
.source-badge.badge-openalex {
    background: rgba(123, 97, 255, 0.15);
    border: 1px solid rgba(123, 97, 255, 0.3);
    color: var(--color-accent);
}