/* CSS Resets & Variable Definitions */
:root {
    /* Fonts */
    --font-sans: 'Outfit', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'JetBrains Mono', monospace;

    /* Theme colors (Dark Mode Default) */
    --bg-app: hsl(222, 28%, 7%);
    --bg-sidebar: hsl(222, 28%, 10%);
    --bg-card: hsla(222, 24%, 13%, 0.7);
    --bg-card-hover: hsla(222, 24%, 17%, 0.8);
    --border-color: hsla(222, 20%, 25%, 0.4);
    --text-main: hsl(210, 30%, 94%);
    --text-muted: hsl(215, 16%, 65%);
    --text-inverse: hsl(222, 28%, 7%);

    /* Brand Accents */
    --primary: hsl(210, 100%, 56%); /* Vibrant Cyan-Blue */
    --primary-glow: hsla(210, 100%, 56%, 0.25);
    
    --gold: hsl(43, 100%, 53%); /* Gold for Golden Keywords */
    --gold-glow: hsla(43, 100%, 53%, 0.25);
    
    --success: hsl(160, 84%, 44%); /* Emerald for good keywords */
    --success-glow: hsla(160, 84%, 44%, 0.2);

    --danger: hsl(354, 85%, 60%); /* Crimson for high competition */
    --danger-glow: hsla(354, 85%, 60%, 0.2);

    /* Shadows & Effects */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.15);
    --shadow-md: 0 8px 30px rgba(0, 0, 0, 0.25);
    --shadow-glow: 0 0 25px var(--primary-glow);
    --glass-blur: blur(16px);
    
    /* Layout */
    --sidebar-width: 280px;
    --header-height: 80px;
}

/* Light Theme overrides */
body.light-theme {
    --bg-app: hsl(210, 20%, 96%);
    --bg-sidebar: hsl(210, 20%, 90%);
    --bg-card: hsla(210, 20%, 100%, 0.8);
    --bg-card-hover: hsla(210, 20%, 97%, 0.9);
    --border-color: hsla(210, 14%, 80%, 0.5);
    --text-main: hsl(222, 28%, 15%);
    --text-muted: hsl(215, 15%, 45%);
    --text-inverse: hsl(210, 20%, 96%);
    
    --primary: hsl(210, 100%, 48%);
    --primary-glow: hsla(210, 100%, 48%, 0.15);
    --gold: hsl(38, 95%, 45%);
    --gold-glow: hsla(38, 95%, 45%, 0.15);
    --success: hsl(160, 80%, 35%);
    --danger: hsl(354, 80%, 50%);
    --shadow-md: 0 8px 30px rgba(0, 0, 0, 0.08);
}

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

body {
    font-family: var(--font-sans);
    background-color: var(--bg-app);
    color: var(--text-main);
    overflow-x: hidden;
    min-height: 100vh;
    transition: background-color 0.3s ease, color 0.3s ease;
    line-height: 1.5;
}

/* Scrollbar Style */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}
::-webkit-scrollbar-track {
    background: var(--bg-app);
}
::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

/* Layout container */
.app-container {
    display: flex;
    min-height: 100vh;
}

/* Sidebar Styling */
.app-sidebar {
    width: var(--sidebar-width);
    background-color: var(--bg-sidebar);
    border-right: 1px solid var(--border-color);
    padding: 2rem 1.5rem;
    display: flex;
    flex-direction: column;
    position: fixed;
    height: 100vh;
    z-index: 10;
    transition: background-color 0.3s ease, border-color 0.3s ease;
}

.sidebar-brand {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 3rem;
    position: relative;
}

.brand-icon {
    font-size: 1.5rem;
    color: var(--gold);
    text-shadow: 0 0 10px var(--gold-glow);
}

.brand-text {
    font-size: 1.25rem;
    font-weight: 700;
    letter-spacing: -0.5px;
}

.logo-glow {
    position: absolute;
    width: 60px;
    height: 60px;
    background: radial-gradient(circle, var(--gold-glow) 0%, transparent 70%);
    top: -20px;
    left: -20px;
    pointer-events: none;
}

.gold-gradient-text {
    background: linear-gradient(135deg, var(--gold) 0%, hsl(50, 100%, 65%) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.sidebar-menu {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    flex-grow: 1;
}

.menu-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 0.85rem 1rem;
    color: var(--text-muted);
    text-decoration: none;
    border-radius: 12px;
    font-weight: 500;
    font-size: 0.95rem;
    transition: all 0.2s ease;
}

.menu-item:hover {
    color: var(--text-main);
    background-color: var(--bg-card-hover);
}

.menu-item.active {
    color: var(--text-main);
    background: linear-gradient(90deg, var(--primary-glow) 0%, transparent 100%);
    border-left: 3px solid var(--primary);
    padding-left: calc(1rem - 3px);
}

.menu-item i {
    font-size: 1.1rem;
}

.sidebar-footer {
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-color);
}

.theme-toggle-btn {
    width: 100%;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    color: var(--text-main);
    cursor: pointer;
    font-family: var(--font-sans);
    font-weight: 500;
    transition: all 0.2s ease;
}

.theme-toggle-btn:hover {
    background-color: var(--bg-card-hover);
    border-color: var(--primary);
}

.theme-icon-light {
    display: none;
}

body.light-theme .theme-icon-dark {
    display: none;
}

body.light-theme .theme-icon-light {
    display: inline-block;
    color: var(--gold);
}

/* Main Workspace */
.app-main {
    margin-left: var(--sidebar-width);
    flex-grow: 1;
    padding: 2.5rem 3rem;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

/* Header */
.app-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 1.5rem;
}

.app-header h1 {
    font-size: 1.85rem;
    font-weight: 700;
    letter-spacing: -0.5px;
    margin-bottom: 0.25rem;
}

.header-sub {
    color: var(--text-muted);
    font-size: 0.95rem;
}

.header-right {
    display: flex;
    gap: 0.75rem;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1.25rem;
    border-radius: 10px;
    font-family: var(--font-sans);
    font-weight: 600;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.2s ease;
    border: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary) 0%, hsl(200, 100%, 50%) 100%);
    color: var(--text-inverse);
    box-shadow: 0 4px 15px var(--primary-glow);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px var(--primary-glow);
}

.btn-secondary {
    background-color: var(--bg-card);
    color: var(--text-main);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background-color: var(--bg-card-hover);
    border-color: var(--text-muted);
}

.btn-danger {
    background-color: var(--danger);
    color: white;
    box-shadow: 0 4px 15px var(--danger-glow);
}

.btn-danger:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px var(--danger-glow);
}

.btn-icon {
    width: 40px;
    height: 40px;
    padding: 0;
    border-radius: 10px;
    background-color: var(--bg-card);
    color: var(--text-main);
    border: 1px solid var(--border-color);
}

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

/* Stat Cards Row */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1.5rem;
}

.stat-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 1.5rem;
    display: flex;
    align-items: center;
    gap: 1.25rem;
    backdrop-filter: var(--glass-blur);
    position: relative;
    overflow: hidden;
    transition: all 0.3s ease;
}

.stat-card:hover {
    transform: translateY(-4px);
    border-color: var(--primary);
    box-shadow: var(--shadow-md);
}

.card-icon {
    width: 50px;
    height: 50px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.35rem;
    background-color: hsla(210, 100%, 56%, 0.1);
    color: var(--primary);
}

.stat-card.golden-keywords .card-icon {
    background-color: hsla(43, 100%, 53%, 0.1);
    color: var(--gold);
}

.stat-card.good-keywords .card-icon {
    background-color: hsla(160, 84%, 44%, 0.1);
    color: var(--success);
}

.stat-card.total-keywords {
    border-bottom: 3px solid var(--primary);
}

.stat-card.golden-keywords {
    border-bottom: 3px solid var(--gold);
}

.stat-card.good-keywords {
    border-bottom: 3px solid var(--success);
}

.stat-card.avg-ratio {
    border-bottom: 3px solid var(--text-muted);
}

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

.stat-label {
    font-size: 0.85rem;
    color: var(--text-muted);
    font-weight: 500;
}

.stat-value {
    font-size: 1.75rem;
    font-weight: 700;
    letter-spacing: -0.5px;
}

/* Card General Styling */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 1.75rem;
    box-shadow: var(--shadow-sm);
    backdrop-filter: var(--glass-blur);
    transition: background-color 0.3s ease, border-color 0.3s ease;
}

.card-header {
    margin-bottom: 1.5rem;
}

.card-header h3 {
    font-size: 1.25rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.header-icon {
    color: var(--primary);
}

.card-subtitle {
    color: var(--text-muted);
    font-size: 0.85rem;
    margin-top: 0.25rem;
}

/* Chart */
.chart-container {
    position: relative;
    height: 320px;
    width: 100%;
}

/* Table Toolbar Controls */
.table-header-toolbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.toolbar-right {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
    align-items: center;
}

.search-box {
    position: relative;
    min-width: 200px;
}

.search-box i {
    position: absolute;
    left: 12px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
    font-size: 0.9rem;
}

.search-box input {
    width: 100%;
    padding: 0.65rem 1rem 0.65rem 2.2rem;
    background-color: var(--bg-sidebar);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    color: var(--text-main);
    font-family: var(--font-sans);
    font-size: 0.9rem;
    transition: all 0.2s ease;
}

.search-box input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--primary-glow);
}

.filter-group {
    display: flex;
    gap: 0.5rem;
}

.form-select {
    padding: 0.65rem 2rem 0.65rem 1rem;
    background-color: var(--bg-sidebar);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    color: var(--text-main);
    font-family: var(--font-sans);
    font-size: 0.9rem;
    cursor: pointer;
    outline: none;
    transition: all 0.2s ease;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 24 24' stroke='rgba(255,255,255,0.6)'%3E%3Cpath stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M19 9l-7 7-7-7'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 10px center;
    background-size: 14px;
}

body.light-theme .form-select {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 24 24' stroke='rgba(0,0,0,0.6)'%3E%3Cpath stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M19 9l-7 7-7-7'/%3E%3C/svg%3E");
}

.form-select:focus {
    border-color: var(--primary);
}

/* Keywords Table */
.table-responsive {
    width: 100%;
    overflow-x: auto;
    border-radius: 12px;
    border: 1px solid var(--border-color);
}

.keywords-table {
    width: 100%;
    border-collapse: collapse;
    text-align: left;
    font-size: 0.95rem;
}

.keywords-table th {
    background-color: var(--bg-sidebar);
    padding: 1rem 1.25rem;
    font-weight: 600;
    color: var(--text-muted);
    border-bottom: 1px solid var(--border-color);
    white-space: nowrap;
}

.keywords-table th.sortable {
    cursor: pointer;
    transition: color 0.2s ease;
}

.keywords-table th.sortable:hover {
    color: var(--text-main);
}

.keywords-table th.sortable i {
    font-size: 0.8rem;
    margin-left: 0.25rem;
}

.keywords-table td {
    padding: 1rem 1.25rem;
    border-bottom: 1px solid var(--border-color);
    vertical-align: middle;
}

.keywords-table tbody tr {
    transition: background-color 0.2s ease;
}

.keywords-table tbody tr:hover {
    background-color: var(--bg-card-hover);
}

.keywords-table tbody tr:last-child td {
    border-bottom: none;
}

/* Table Specific Columns */
.td-keyword {
    font-weight: 600;
    color: var(--text-main);
}

.td-number {
    font-family: var(--font-mono);
    font-size: 0.9rem;
}

.td-ratio {
    font-family: var(--font-mono);
    font-weight: 700;
}

/* Badges for status grading */
.badge {
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    padding: 0.25rem 0.65rem;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: -0.2px;
}

.badge-golden {
    background-color: hsla(43, 100%, 53%, 0.15);
    color: var(--gold);
    border: 1px solid hsla(43, 100%, 53%, 0.3);
    box-shadow: 0 0 10px hsla(43, 100%, 53%, 0.1);
}

.badge-good {
    background-color: hsla(160, 84%, 44%, 0.15);
    color: var(--success);
    border: 1px solid hsla(160, 84%, 44%, 0.3);
}

.badge-hard {
    background-color: hsla(354, 85%, 60%, 0.1);
    color: var(--danger);
    border: 1px solid hsla(354, 85%, 60%, 0.2);
}

/* Table Actions column */
.row-actions {
    display: flex;
    gap: 0.35rem;
}

.btn-table-action {
    background: transparent;
    border: none;
    width: 32px;
    height: 32px;
    border-radius: 8px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
    transition: all 0.2s ease;
}

.btn-table-action:hover {
    background-color: var(--bg-sidebar);
    color: var(--text-main);
}

.btn-table-action.btn-delete:hover {
    background-color: var(--danger-glow);
    color: var(--danger);
}

/* Table Footer & Pagination */
.table-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 1.5rem;
}

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

.pagination-controls {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.btn-pagination {
    padding: 0.5rem 1rem;
    background-color: var(--bg-sidebar);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-main);
}

.btn-pagination:hover:not(:disabled) {
    background-color: var(--bg-card-hover);
    border-color: var(--primary);
}

.btn-pagination:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.pagination-info {
    font-size: 0.9rem;
    font-weight: 600;
}

/* Import/Export Panel Grid */
.import-export-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.import-box, .export-box {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.import-box h4, .export-box h4, .data-reset-box h4 {
    font-size: 1.1rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

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

textarea {
    width: 100%;
    height: 180px;
    background-color: var(--bg-sidebar);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1rem;
    color: var(--text-main);
    font-family: var(--font-mono);
    font-size: 0.85rem;
    resize: none;
    outline: none;
    transition: all 0.2s ease;
}

textarea:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--primary-glow);
}

.box-actions {
    display: flex;
    gap: 0.75rem;
}

.data-reset-box {
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    align-items: flex-start;
}

.data-reset-box h4 {
    color: var(--danger);
}

/* Modal Overlay & Card styling */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 100;
    display: none;
    align-items: center;
    justify-content: center;
}

.modal.active {
    display: flex;
}

.modal-backdrop {
    position: absolute;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
}

.modal-content {
    background-color: var(--bg-sidebar);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    width: 90%;
    max-width: 500px;
    padding: 2rem;
    position: relative;
    box-shadow: var(--shadow-md);
    z-index: 10;
    animation: modalShow 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

@keyframes modalShow {
    from {
        transform: translateY(30px) scale(0.95);
        opacity: 0;
    }
    to {
        transform: translateY(0) scale(1);
        opacity: 1;
    }
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.modal-header h3 {
    font-size: 1.35rem;
    font-weight: 700;
}

.modal-close {
    background: transparent;
    border: none;
    font-size: 1.25rem;
    color: var(--text-muted);
    cursor: pointer;
    transition: color 0.2s ease;
}

.modal-close:hover {
    color: var(--text-main);
}

/* Form Styles */
.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    margin-bottom: 1.25rem;
}

.form-row {
    display: flex;
    gap: 1rem;
}

.form-row .form-group {
    flex: 1;
}

label {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-muted);
}

.required {
    color: var(--danger);
}

.form-control {
    width: 100%;
    padding: 0.75rem 1rem;
    background-color: var(--bg-app);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    color: var(--text-main);
    font-family: var(--font-sans);
    font-size: 0.95rem;
    outline: none;
    transition: all 0.2s ease;
}

.form-control:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--primary-glow);
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: 0.75rem;
    margin-top: 2rem;
}

/* Custom Animation Utility Classes */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(15px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.app-main > * {
    animation: fadeInUp 0.5s ease forwards;
}

/* Stagger animations for list loads */
.app-main > *:nth-child(1) { animation-delay: 0.05s; }
.app-main > *:nth-child(2) { animation-delay: 0.1s; }
.app-main > *:nth-child(3) { animation-delay: 0.15s; }
.app-main > *:nth-child(4) { animation-delay: 0.2s; }

/* Responsive adjustments */
@media (max-width: 992px) {
    .app-sidebar {
        width: 80px;
        padding: 2rem 0.5rem;
        align-items: center;
    }
    .brand-text, .theme-text, .menu-item span {
        display: none;
    }
    .sidebar-brand {
        justify-content: center;
        margin-bottom: 2.5rem;
    }
    .menu-item {
        justify-content: center;
        padding: 0.85rem;
    }
    .menu-item.active {
        border-left: none;
        border-bottom: 3px solid var(--primary);
        padding-left: 0.85rem;
        border-radius: 0;
    }
    .theme-toggle-btn {
        justify-content: center;
        padding: 0.75rem;
    }
    .app-main {
        margin-left: 80px;
        padding: 2rem;
    }
}

@media (max-width: 768px) {
    .app-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 1rem;
    }
    .table-header-toolbar {
        flex-direction: column;
        align-items: flex-start;
    }
    .toolbar-right {
        width: 100%;
        justify-content: space-between;
    }
    .search-box {
        flex-grow: 1;
    }
    .app-main {
        padding: 1.5rem;
    }
}