:root {
    --bg-color: #020617;
    --card-bg: rgba(30, 41, 59, 0.7);
    --accent-color: #38bdf8;
    --accent-hover: #0ea5e9;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --border-color: rgba(255, 255, 255, 0.1);
    --error-color: #ef4444;
    --success-color: #22c55e;
    --sidebar-width: 280px;
    --glass-bg: rgba(15, 23, 42, 0.8);
    --glass-border: rgba(255, 255, 255, 0.1);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: radial-gradient(circle at top right, #1e1b4b, #020617);
    color: var(--text-primary);
    line-height: 1.5;
    height: 100vh;
    overflow: hidden;
}

.hidden {
    display: none !important;
}

.flex-center {
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Screens */
.screen {
    height: 100vh;
    width: 100vw;
}

/* Login Screen */
.login-card {
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    padding: 3rem;
    border-radius: 1.5rem;
    width: 100%;
    max-width: 450px;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5), 0 0 40px rgba(56, 189, 248, 0.1);
    border: 1px solid var(--glass-border);
    animation: fadeIn 0.8s ease-out;
}

.brand {
    text-align: center;
    margin-bottom: 2.5rem;
}

.logo {
    font-size: 3rem;
    display: block;
    margin-bottom: 0.5rem;
    filter: drop-shadow(0 0 10px var(--accent-color));
}

.brand h1 {
    font-size: 2.2rem;
    font-weight: 800;
    background: linear-gradient(to right, #fff, var(--accent-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.brand p {
    color: var(--text-secondary);
    font-size: 1rem;
    letter-spacing: 1px;
}

.form-group {
    margin-bottom: 2rem;
}

.form-group label {
    display: block;
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

input {
    width: 100%;
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid var(--border-color);
    padding: 1rem 1.25rem;
    border-radius: 0.75rem;
    color: white;
    font-size: 1.1rem;
    outline: none;
    transition: var(--transition);
}

textarea,
select {
    font-family: inherit;
}

textarea {
    width: 100%;
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid var(--border-color);
    padding: 1rem 1.25rem;
    border-radius: 0.75rem;
    color: white;
    font-size: 1rem;
    outline: none;
    resize: vertical;
    transition: var(--transition);
}

textarea:focus,
select:focus {
    border-color: var(--accent-color);
    box-shadow: 0 0 0 4px rgba(56, 189, 248, 0.1);
}

input:focus {
    border-color: var(--accent-color);
    box-shadow: 0 0 0 4px rgba(56, 189, 248, 0.1);
    background: rgba(0, 0, 0, 0.5);
}

.btn-primary {
    width: 100%;
    background: linear-gradient(135deg, var(--accent-color), #0ea5e9);
    color: #0f172a;
    border: none;
    padding: 1rem;
    border-radius: 0.75rem;
    font-weight: 700;
    font-size: 1.1rem;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    box-shadow: 0 10px 15px -3px rgba(56, 189, 248, 0.4);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 20px 25px -5px rgba(56, 189, 248, 0.5);
    filter: brightness(1.1);
}

.btn-primary:disabled {
    opacity: 0.7;
    cursor: not-allowed;
    transform: none;
}

.btn-ghost {
    background: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
    padding: 0.75rem 1.25rem;
    border-radius: 0.6rem;
    cursor: pointer;
    width: 100%;
    transition: var(--transition);
    font-weight: 500;
}

.btn-ghost:hover {
    background: rgba(255, 255, 255, 0.05);
    color: white;
    border-color: var(--text-secondary);
}

.error-text {
    color: var(--error-color);
    font-size: 0.9rem;
    margin-top: 1.5rem;
    text-align: center;
    font-weight: 500;
}

/* App Screen Layout */
#app-screen {
    display: flex;
}

.sidebar {
    width: var(--sidebar-width);
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    border-right: 1px solid var(--glass-border);
    display: flex;
    flex-direction: column;
    padding: 2rem 1.5rem;
}

.sidebar-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 3.5rem;
}

.brand-name {
    font-weight: 800;
    font-size: 1.5rem;
    background: linear-gradient(to right, #fff, var(--accent-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.nav-links {
    list-style: none;
    flex: 1;
}

.nav-links li {
    padding: 1rem 1.25rem;
    border-radius: 1rem;
    margin-bottom: 0.75rem;
    cursor: pointer;
    color: var(--text-secondary);
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 1rem;
    font-weight: 500;
}

.pipeline-nav {
    overflow-y: auto;
    padding-right: 0.25rem;
}

.pipeline-nav li {
    align-items: flex-start;
    gap: 0.75rem;
    padding: 0.85rem 0.9rem;
    border-radius: 0.8rem;
}

.pipeline-nav li span:not(.step-num) {
    display: block;
    line-height: 1.15;
}

.pipeline-nav li small {
    display: block;
    margin-top: 0.25rem;
    color: var(--text-secondary);
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
}

.step-num {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex: 0 0 28px;
    background: rgba(255, 255, 255, 0.08);
    color: var(--text-primary);
    font-size: 0.78rem;
    font-weight: 800;
}

.pipeline-nav li.active .step-num {
    background: var(--accent-color);
    color: #020617;
}

.nav-links li:hover {
    background: rgba(255, 255, 255, 0.05);
    color: white;
    transform: translateX(5px);
}

.nav-links li.active {
    background: rgba(56, 189, 248, 0.15);
    color: var(--accent-color);
    font-weight: 700;
    border: 1px solid rgba(56, 189, 248, 0.2);
}

.content-area {
    flex: 1;
    padding: 3rem;
    overflow-y: auto;
}

.main-header {
    margin-bottom: 3rem;
    animation: fadeIn 0.5s ease-out;
}

.main-header h2 {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 0.75rem;
    letter-spacing: -1px;
}

.main-header p {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

.step-kicker {
    color: var(--accent-color);
    font-weight: 800;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 0.75rem;
}

/* Cards & Sections */
.card {
    background: var(--card-bg);
    backdrop-filter: blur(8px);
    border: 1px solid var(--border-color);
    border-radius: 1.25rem;
    padding: 2rem;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
}

.search-card {
    margin-bottom: 2.5rem;
    border: 1px solid rgba(56, 189, 248, 0.2);
    box-shadow: 0 10px 30px -10px rgba(56, 189, 248, 0.1);
}

.search-input-group {
    display: flex;
    gap: 1.25rem;
}

.search-input-group input {
    flex: 1;
    font-size: 1.2rem;
}

.search-input-group .btn-primary {
    width: auto;
    padding-left: 2.5rem;
    padding-right: 2.5rem;
}

/* Results Area */
.results-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.results-table-container {
    background: var(--card-bg);
    border-radius: 1.25rem;
    border: 1px solid var(--border-color);
    overflow: hidden;
    animation: slideUp 0.6s ease-out;
}

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

th {
    padding: 1.25rem 1.5rem;
    background: rgba(255, 255, 255, 0.03);
    color: var(--text-secondary);
    font-weight: 600;
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    border-bottom: 1px solid var(--border-color);
}

td {
    padding: 1.25rem 1.5rem;
    border-bottom: 1px solid var(--border-color);
    font-size: 1rem;
}

tr:hover td {
    background: rgba(255, 255, 255, 0.02);
}

.badge {
    padding: 0.4rem 0.8rem;
    border-radius: 2rem;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
}

.badge-info { background: rgba(56, 189, 248, 0.1); color: var(--accent-color); }
.badge-success { background: rgba(34, 197, 94, 0.1); color: var(--success-color); }
.badge-warning { background: rgba(234, 179, 8, 0.1); color: #eab308; }
.badge-error { background: rgba(239, 68, 68, 0.1); color: var(--error-color); }

.difficulty-meter {
    width: 100%;
    height: 8px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 4px;
    overflow: hidden;
    margin-top: 5px;
}

.difficulty-fill {
    height: 100%;
    border-radius: 4px;
    transition: width 1s ease-out;
}

.empty-state {
    text-align: center;
    padding: 6rem 2rem;
    color: var(--text-secondary);
    border: 2px dashed var(--border-color);
    border-radius: 1.5rem;
    margin-top: 2rem;
}

.empty-state.compact {
    padding: 2rem;
}

.placeholder-grid,
.form-grid,
.two-column-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1.5rem;
}

.form-grid {
    margin-bottom: 1.5rem;
}

.field-stack {
    margin-top: 1rem;
}

.section-helper {
    color: var(--text-secondary);
    margin: 0.35rem 0 1rem;
    font-size: 0.92rem;
}

.split-row,
.competitor-entry,
.card-heading-row,
.form-actions {
    display: flex;
    gap: 1rem;
}

.split-row > *,
.competitor-entry input {
    flex: 1;
}

.card-heading-row,
.form-actions {
    align-items: center;
    justify-content: space-between;
}

.wizard-actions {
    display: flex;
    justify-content: flex-end;
    gap: 1rem;
    margin-top: 2rem;
    padding: 1rem 0 0;
}

.wizard-actions .btn-primary,
.wizard-actions .btn-ghost {
    min-width: 150px;
}

.ahrefs-card {
    border-color: rgba(56, 189, 248, 0.28);
}

.ahrefs-controls {
    display: grid;
    grid-template-columns: minmax(150px, 0.9fr) minmax(120px, 0.6fr) minmax(240px, 1.4fr) auto;
    gap: 1rem;
    align-items: end;
}

.ahrefs-controls .field-stack {
    margin-top: 0;
}

.toggle-row {
    display: flex;
    align-items: center;
    gap: 0.65rem;
    min-height: 48px;
    color: var(--text-secondary);
    font-weight: 700;
}

.toggle-row input {
    width: 18px;
    height: 18px;
    accent-color: var(--accent-color);
}

.pool-filters {
    display: grid;
    grid-template-columns: minmax(220px, 1.5fr) repeat(4, minmax(150px, 1fr));
    gap: 0.85rem;
    margin-bottom: 1rem;
}

.pool-filters input,
.pool-filters select {
    min-height: 46px;
}

.card-heading-row p,
.muted-status {
    color: var(--text-secondary);
    margin: 0.35rem 0 0;
}

.inline-button {
    width: auto;
    padding-left: 1.25rem;
    padding-right: 1.25rem;
}

.competitor-slots {
    display: grid;
    gap: 1rem;
}

.cleanup-toolbar {
    display: grid;
    grid-template-columns: minmax(220px, 1.5fr) repeat(5, minmax(130px, 1fr)) auto;
    gap: 1rem;
    align-items: end;
    margin-top: 1rem;
}

.cleanup-actions {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
    margin-top: 1rem;
}

.cleanup-toolbar .btn-primary {
    width: auto;
}

.cleanup-status-select {
    min-width: 140px;
}

.cleanup-notes-input {
    min-width: 220px;
}

.competitor-slot {
    display: grid;
    grid-template-columns: 34px minmax(180px, 1fr) minmax(160px, 0.75fr) auto;
    gap: 0.75rem;
    align-items: end;
    padding: 1rem;
    border: 1px solid var(--border-color);
    border-radius: 0.75rem;
    background: rgba(15, 23, 42, 0.32);
}

.competitor-slot .field-stack {
    margin-top: 0;
}

.competitor-slot-number {
    width: 34px;
    height: 34px;
    display: grid;
    place-items: center;
    border-radius: 999px;
    background: rgba(56, 189, 248, 0.12);
    color: var(--accent-color);
    font-weight: 800;
    align-self: center;
}

.competitor-notes-field {
    grid-column: 2 / 5;
}

.competitor-clear-button {
    width: auto;
    padding: 0.75rem 1rem;
}

#project-section .form-actions {
    display: block;
}

#project-section #btn-save-project {
    display: none;
}

.project-manager {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1.5rem;
    margin-bottom: 1.5rem;
}

.project-manager h3 {
    margin: 0 0 0.35rem;
}

.project-manager p {
    color: var(--text-secondary);
    margin: 0;
}

.project-manager-controls {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    min-width: min(100%, 560px);
}

.project-manager-controls select {
    min-width: 260px;
}

.btn-danger {
    background: rgba(239, 68, 68, 0.12);
    color: #fecaca;
    border: 1px solid rgba(239, 68, 68, 0.35);
}

.btn-danger:hover {
    background: rgba(239, 68, 68, 0.2);
    border-color: rgba(239, 68, 68, 0.6);
}

.objectives-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0.65rem 1rem;
    margin-top: 1rem;
}

.objectives-grid label {
    display: flex;
    gap: 0.55rem;
    align-items: flex-start;
    color: var(--text-secondary);
    font-size: 0.92rem;
}

.objectives-grid input {
    width: auto;
    margin-top: 0.2rem;
}

.mini-table {
    margin-top: 1rem;
    overflow-x: auto;
}

.mini-table table {
    font-size: 0.9rem;
}

.mini-table th,
.mini-table td {
    padding: 0.8rem;
}

.segmented-tabs {
    display: inline-flex;
    gap: 0.25rem;
    padding: 0.25rem;
    border: 1px solid var(--border-color);
    border-radius: 0.75rem;
    background: rgba(0, 0, 0, 0.2);
}

.segmented-tabs button {
    border: 0;
    border-radius: 0.55rem;
    background: transparent;
    color: var(--text-secondary);
    padding: 0.55rem 0.8rem;
    font-weight: 700;
    cursor: pointer;
}

.segmented-tabs button.active {
    background: var(--accent-color);
    color: #020617;
}

.checkbox-list {
    display: grid;
    gap: 0.65rem;
    margin: 1rem 0;
}

.checkbox-list label {
    display: flex;
    align-items: flex-start;
    gap: 0.65rem;
    color: var(--text-primary);
    padding: 0.7rem;
    border: 1px solid var(--border-color);
    border-radius: 0.7rem;
    background: rgba(255, 255, 255, 0.03);
}

.checkbox-list input {
    width: auto;
    margin-top: 0.2rem;
}

.compact-list ul {
    margin: 0;
    padding-left: 1.2rem;
    color: var(--text-secondary);
}

.compact-list li {
    margin: 0.45rem 0;
}

.button-row {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
}

.export-columns {
    display: flex;
    flex-wrap: wrap;
    gap: 0.55rem;
    margin-top: 1.25rem;
}

.export-columns span {
    padding: 0.45rem 0.7rem;
    border-radius: 999px;
    background: rgba(56, 189, 248, 0.12);
    color: var(--accent-color);
    font-size: 0.8rem;
    font-weight: 800;
}

.instruction-list {
    margin: 1rem 0 0 1.2rem;
    color: var(--text-secondary);
}

.instruction-list li {
    margin: 0.65rem 0;
}

.check-row {
    display: flex;
    align-items: center;
    gap: 0.65rem;
    color: var(--text-secondary);
}

.check-row input {
    width: auto;
}

#import-summary .summary-grid > div {
    padding: 1rem;
    border: 1px solid var(--border-color);
    border-radius: 0.85rem;
    background: rgba(255, 255, 255, 0.03);
}

#import-summary strong {
    display: block;
    font-size: 1.55rem;
    color: var(--text-primary);
}

#import-summary span {
    color: var(--text-secondary);
    font-size: 0.85rem;
}

.summary-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 1rem;
    margin-bottom: 1.5rem;
}

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

.field-label {
    display: block;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.field-control {
    width: 100%;
    padding: 0.75rem;
    border-radius: 0.6rem;
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid var(--border-color);
    color: white;
}

.notice-card {
    margin-bottom: 1.5rem;
    border-color: rgba(56, 189, 248, 0.25);
}

.loading-block {
    text-align: center;
    padding: 3rem;
    color: var(--text-secondary);
}

.duplicate-groups {
    display: grid;
    gap: 1rem;
    margin-top: 1.5rem;
}

.duplicate-card {
    border-color: rgba(245, 158, 11, 0.25);
}

.duplicate-select {
    align-items: center;
    margin-bottom: 0.75rem;
}

.duplicate-select input {
    width: 18px;
    height: 18px;
    flex: 0 0 auto;
}

.duplicate-card table {
    min-width: 760px;
}

.final-serp-result .summary-grid {
    margin: 0;
}

.compact-list {
    list-style: none;
    padding: 0;
    margin: 1rem 0 0;
}

.compact-list li {
    padding: 0.65rem 0;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-secondary);
}

.compact-list li:last-child {
    border-bottom: 0;
}

.cluster-map {
    display: grid;
    gap: 1rem;
    margin-top: 1.5rem;
}

.cluster-card {
    border-color: rgba(34, 197, 94, 0.22);
}

.cluster-card-head {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 1rem;
}

.cluster-card-head p {
    margin: 0.35rem 0 0;
    color: var(--text-secondary);
}

.cluster-score {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    display: grid;
    place-items: center;
    border: 2px solid rgba(34, 197, 94, 0.45);
    color: var(--text-primary);
    font-weight: 800;
    flex: 0 0 auto;
}

.cluster-url-row {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin: 1rem 0;
    padding: 0.85rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: 0.6rem;
    background: rgba(255, 255, 255, 0.03);
}

.cluster-url-row span {
    color: var(--text-secondary);
    font-size: 0.85rem;
}

.cluster-url-row strong {
    color: var(--text-primary);
}

.cluster-meta-grid {
    margin: 0 0 1rem;
}

.cluster-keywords {
    display: grid;
    gap: 0.45rem;
    margin-bottom: 0.8rem;
}

.cluster-keywords p {
    margin: 0;
    color: var(--text-secondary);
}

.url-validation-card {
    border-color: rgba(56, 189, 248, 0.22);
}

.document-preview {
    max-height: 520px;
    overflow: auto;
    padding: 1rem;
    margin: 1rem 0 0;
    border: 1px solid var(--border-color);
    border-radius: 0.6rem;
    background: rgba(0, 0, 0, 0.28);
    color: var(--text-secondary);
    white-space: pre-wrap;
    word-break: break-word;
    font-size: 0.85rem;
    line-height: 1.55;
}

@media (max-width: 1100px) {
    #app-screen {
        flex-direction: column;
    }

    .sidebar {
        width: 100%;
        max-height: 42vh;
    }

    .placeholder-grid,
    .form-grid,
    .two-column-grid,
    .summary-grid {
        grid-template-columns: 1fr;
    }

    .control-row,
    .search-input-group,
    .split-row,
    .competitor-entry,
    .project-manager,
    .project-manager-controls,
    .card-heading-row,
    .form-actions {
        flex-direction: column;
    }

    .project-manager {
        align-items: stretch;
    }

    .project-manager-controls {
        min-width: 0;
        align-items: stretch;
    }

    .competitor-slot {
        grid-template-columns: 34px 1fr;
    }

    .cleanup-toolbar {
        grid-template-columns: 1fr;
    }

    .ahrefs-controls {
        grid-template-columns: 1fr;
    }

    .pool-filters {
        grid-template-columns: 1fr;
    }

    .cleanup-toolbar .btn-primary {
        width: 100%;
    }

    .competitor-notes-field,
    .competitor-clear-button {
        grid-column: 2;
    }

    .competitor-clear-button {
        justify-self: start;
    }

    .wizard-actions {
        align-items: stretch;
    }

    .wizard-actions .btn-primary,
    .wizard-actions .btn-ghost {
        width: 100%;
    }

    .project-manager-controls select {
        min-width: 0;
    }

    .objectives-grid {
        grid-template-columns: 1fr;
    }
}

/* Animations & Loaders */
.loader {
    width: 24px;
    height: 24px;
    border: 3px solid rgba(255, 255, 255, 0.2);
    border-top: 3px solid #fff;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

@keyframes fadeIn {
    from { opacity: 0; transform: scale(0.98); }
    to { opacity: 1; transform: scale(1); }
}

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

/* Scrollbar */
::-webkit-scrollbar {
    width: 10px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 10px;
    border: 2px solid transparent;
    background-clip: padding-box;
}

::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.2);
    background-clip: padding-box;
}