/* ResearchGPT Core Stylesheet - Premium Light Theme (Dribbble Inspo) */
:root {
    --bg-main: #f0f4f8;
    --bg-sidebar: #ffffff;
    --card-bg: rgba(255, 255, 255, 0.95);
    --card-border: rgba(0, 0, 0, 0.04);
    --text-primary: #0f172a;
    --text-secondary: #334155;
    --text-muted: #64748b;
    --primary-gradient: linear-gradient(135deg, #4f46e5 0%, #3b82f6 100%);
    --accent-color: #4f46e5;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    --primary-soft: rgba(79, 70, 229, 0.08);
    --success-soft: rgba(16, 185, 129, 0.08);
    --info-soft: rgba(6, 182, 212, 0.08);
    --warning-soft: rgba(245, 158, 11, 0.08);
    --danger-soft: rgba(239, 68, 68, 0.08);
    --dark-soft: rgba(15, 23, 42, 0.04);
}

body {
    background-color: var(--bg-main);
    color: var(--text-secondary);
    font-family: 'Inter', sans-serif;
    margin: 0;
    padding: 0;
    overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6, .logo-text, .page-title {
    font-family: 'Outfit', sans-serif;
    font-weight: 600;
}

::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}
::-webkit-scrollbar-track {
    background: transparent;
}
::-webkit-scrollbar-thumb {
    background: rgba(0, 0, 0, 0.1);
    border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
    background: rgba(0, 0, 0, 0.2);
}

.app-container {
    display: flex;
    min-height: 100vh;
    width: 100vw;
}

.app-sidebar {
    width: 280px;
    background-color: var(--bg-sidebar);
    border-right: 1px solid var(--card-border);
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
    z-index: 1000;
    transition: all 0.3s ease;
}

.sidebar-header {
    padding: 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo-area {
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo-icon {
    font-size: 1.8rem;
}

.logo-text {
    font-size: 1.4rem;
    color: var(--text-primary);
    margin: 0;
    letter-spacing: -0.5px;
}

.text-gradient {
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.sidebar-close-btn {
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 1.2rem;
}

.sidebar-nav {
    padding: 10px 16px;
}

.nav-list {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    color: var(--text-secondary);
    text-decoration: none;
    border-radius: 12px;
    font-weight: 500;
    font-size: 0.95rem;
    transition: all 0.2s ease;
}

.nav-link i {
    font-size: 1.1rem;
    color: var(--text-muted);
    transition: color 0.2s ease;
    width: 20px;
    text-align: center;
}

.nav-link:hover {
    background-color: rgba(0, 0, 0, 0.02);
    color: var(--text-primary);
}

.nav-link:hover i {
    color: var(--accent-color);
}

.nav-link.active {
    background: var(--primary-gradient);
    color: white !important;
    font-weight: 600;
    box-shadow: 0 4px 12px rgba(79, 70, 229, 0.3);
}

.nav-link.active i {
    color: white !important;
}

.sidebar-divider {
    height: 1px;
    background-color: rgba(0,0,0,0.05);
    margin: 20px 24px;
}

.sidebar-papers-section {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    padding: 0 16px;
}

.section-title {
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--text-muted);
    letter-spacing: 1px;
}

.sidebar-papers-list {
    overflow-y: auto;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    gap: 6px;
    padding-bottom: 20px;
}

.paper-item-sidebar {
    padding: 10px 12px;
    background-color: rgba(0, 0, 0, 0.02);
    border: 1px solid transparent;
    border-radius: 8px;
    transition: all 0.2s ease;
}

.paper-item-sidebar:hover {
    background-color: rgba(0, 0, 0, 0.04);
    border-color: rgba(0,0,0,0.05);
}

.paper-name {
    font-size: 0.85rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.btn-icon-only {
    background: none;
    border: none;
    padding: 4px 8px;
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.2s ease;
    color: var(--text-muted);
}

.btn-icon-only:hover {
    background-color: rgba(0, 0, 0, 0.05);
    color: var(--danger-color);
}

.sidebar-footer {
    padding: 20px 24px;
    border-top: 1px solid rgba(0,0,0,0.05);
    background-color: #f8fafc;
}

.user-profile {
    overflow: hidden;
    background: white;
    padding: 12px;
    border-radius: 12px;
    border: 1px solid rgba(0,0,0,0.05);
    box-shadow: 0 2px 8px rgba(0,0,0,0.02);
}

.avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--primary-gradient);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.1rem;
    flex-shrink: 0;
}

.profile-name {
    font-size: 0.85rem;
    color: var(--text-primary);
    font-weight: 600;
}

.profile-status {
    font-size: 0.75rem;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: 4px;
}

.status-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background-color: var(--success-color);
    display: inline-block;
}

.app-main {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    min-width: 0;
}

.app-header {
    height: 70px;
    padding: 0 30px;
    background-color: rgba(240, 244, 248, 0.8);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(0,0,0,0.03);
    flex-shrink: 0;
}

.page-title {
    font-size: 1.25rem;
    color: var(--text-primary);
    margin: 0;
}

.sidebar-toggle-btn {
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 1.2rem;
}

.api-status-badge {
    font-size: 0.8rem;
    font-weight: 600;
    padding: 6px 14px;
    border-radius: 50px;
}

.bg-primary-soft { background-color: var(--primary-soft); color: var(--accent-color); }
.bg-success-soft { background-color: var(--success-soft); color: var(--success-color); }
.bg-info-soft { background-color: var(--info-soft); color: #0284c7; }
.bg-warning-soft { background-color: var(--warning-soft); color: var(--warning-color); }
.bg-danger-soft { background-color: var(--danger-soft); color: var(--danger-color); }
.bg-dark-soft { background-color: var(--dark-soft); }

.glass-card {
    background: var(--card-bg);
    border: 1px solid rgba(0,0,0,0.05);
    border-radius: 16px;
    box-shadow: 0 4px 24px 0 rgba(0, 0, 0, 0.03);
}

.content-viewport {
    flex-grow: 1;
    padding: 30px;
    overflow-y: auto;
}

.hero-card {
    background: linear-gradient(135deg, rgba(255, 255, 255, 1) 0%, rgba(248, 250, 252, 1) 100%);
    border-left: 4px solid var(--accent-color);
}

.max-width-600 {
    max-width: 600px;
}

.hero-graphic {
    position: relative;
    width: 150px;
    height: 150px;
}

.glow-orb {
    position: absolute;
    width: 120px;
    height: 120px;
    background: radial-gradient(circle, rgba(79, 70, 229, 0.15) 0%, rgba(59, 130, 246, 0) 70%);
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    border-radius: 50%;
    filter: blur(10px);
}

.graphic-icon {
    font-size: 5rem;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: var(--accent-color);
    text-shadow: 0 0 20px rgba(79, 70, 229, 0.2);
    animation: pulse 4s infinite ease-in-out;
}

@keyframes pulse {
    0%, 100% { transform: translate(-50%, -50%) scale(1); opacity: 0.8; }
    50% { transform: translate(-50%, -50%) scale(1.08); opacity: 1; }
}

@keyframes floating {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

.stat-card {
    border-radius: 16px;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.stat-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(0,0,0,0.06);
}

.stat-icon-wrapper {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.4rem;
}

.stat-value {
    font-size: 1.5rem;
    color: var(--text-primary);
}

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

.feature-card {
    transition: all 0.2s ease;
}
.feature-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 30px rgba(0,0,0,0.08);
}
.feature-icon {
    font-size: 2rem;
}

.upload-dropzone {
    border: 2px dashed rgba(0,0,0,0.1);
    background-color: rgba(0, 0, 0, 0.02);
    border-radius: 16px;
    padding: 40px 20px;
    text-align: center;
    cursor: pointer;
    transition: all 0.2s ease;
}

.upload-dropzone.dragover, .upload-dropzone:hover {
    border-color: var(--accent-color);
    background-color: rgba(79, 70, 229, 0.02);
    box-shadow: 0 0 15px rgba(79, 70, 229, 0.08);
}

.dropzone-icon {
    font-size: 3rem;
    color: var(--text-muted);
    transition: color 0.2s ease;
}

.upload-dropzone:hover .dropzone-icon {
    color: var(--accent-color);
}

.custom-table th {
    color: var(--text-muted);
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 1px;
    text-transform: uppercase;
    border-bottom: 1px solid rgba(0,0,0,0.05);
    padding: 12px 16px;
}

.custom-table td {
    padding: 16px;
    border-bottom: 1px solid rgba(0,0,0,0.05);
    color: var(--text-secondary);
}

.custom-table tbody tr:hover {
    background-color: rgba(0, 0, 0, 0.02);
}

.file-name {
    font-size: 0.9rem;
    font-weight: 500;
    max-width: 250px;
    display: inline-block;
}

.chat-layout-container {
    display: flex;
    width: 100%;
    height: 100%;
}

.chat-main-workspace {
    flex-grow: 1;
    height: 100%;
    min-width: 0;
    background-color: #f8fafc;
}

.chat-toolbar {
    background-color: transparent;
    border-bottom: none !important;
    height: 52px;
}

.chat-messages-container {
    overflow-y: auto;
    background-color: transparent;
}

.chat-message {
    display: flex;
    width: 100%;
}

.chat-message.user {
    justify-content: flex-end;
}

.chat-message.assistant {
    justify-content: flex-start;
}

.ai-avatar {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.9rem;
}

.message-bubble {
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.05);
    border: 1px solid rgba(0,0,0,0.02);
}

.chat-message.user .message-bubble {
    background: var(--primary-gradient) !important;
    color: white !important;
}

.chat-message.user .message-bubble p {
    color: white !important;
}

.message-text {
    font-size: 0.95rem;
    line-height: 1.6;
    color: var(--text-secondary);
}

.chat-input-wrapper {
    flex-shrink: 0;
}

.chat-input-wrapper .form-control::placeholder {
    color: #cbd5e1;
}

.chat-input-wrapper .form-control:focus {
    box-shadow: none;
    border-color: transparent;
}

.prompt-suggestion:hover {
    background-color: #f1f5f9;
    transform: translateY(-1px);
}

.chat-citations-sidebar {
    width: 320px;
    height: 100%;
    background-color: white;
    border-left: 1px solid rgba(0,0,0,0.05) !important;
    flex-shrink: 0;
    overflow-y: auto;
    box-shadow: -5px 0 20px rgba(0,0,0,0.02);
}

.citation-card {
    transition: all 0.3s ease;
    background: #f8fafc;
    border: 1px solid rgba(0,0,0,0.05);
}

.citation-card:hover {
    border-color: rgba(0,0,0,0.1);
    background: white;
    box-shadow: 0 4px 12px rgba(0,0,0,0.04);
}

.citation-flash {
    border-color: var(--success-color) !important;
    box-shadow: 0 0 15px rgba(16, 185, 129, 0.15) !important;
}

.citation-tag {
    color: var(--success-color);
    font-weight: 600;
    text-decoration: none;
    margin: 0 2px;
    padding: 1px 4px;
    border-radius: 4px;
    background-color: var(--success-soft);
    font-size: 0.85rem;
    transition: all 0.2s ease;
}

.citation-tag:hover {
    background-color: var(--success-color);
    color: white;
}