/* ===== CSS Variables & Reset ===== */
:root {
    /* Colors */
    --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --secondary-gradient: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --accent-gradient: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);

    --bg-dark: #0f0f23;
    --bg-card: rgba(255, 255, 255, 0.05);
    --bg-card-hover: rgba(255, 255, 255, 0.08);

    --text-primary: #ffffff;
    --text-secondary: #a0a0c0;
    --text-muted: #6b6b8c;

    --border-color: rgba(255, 255, 255, 0.1);
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.4);

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;

    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;

    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--bg-dark);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
}

/* ===== Background Gradient ===== */
.bg-gradient {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    background:
        radial-gradient(circle at 20% 20%, rgba(102, 126, 234, 0.15) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(118, 75, 162, 0.15) 0%, transparent 50%),
        radial-gradient(circle at 50% 50%, rgba(79, 172, 254, 0.1) 0%, transparent 70%);
    animation: gradientShift 15s ease infinite;
}

@keyframes gradientShift {

    0%,
    100% {
        opacity: 1;
    }

    50% {
        opacity: 0.8;
    }
}

/* ===== Container ===== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* ===== Header ===== */
.header {
    padding: var(--spacing-lg) 0;
    border-bottom: 1px solid var(--border-color);
    backdrop-filter: blur(10px);
    background: rgba(15, 15, 35, 0.8);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.logo h1 {
    font-size: 1.5rem;
    font-weight: 700;
    white-space: nowrap;
}

.header-subtitle-container {
    margin-top: -12px;
}

.header-subtitle {
    color: var(--text-secondary);
    font-size: 0.875rem;
    margin-left: 44px;
}

.header-actions {
    display: flex;
    gap: var(--spacing-sm);
}

.btn-icon {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    padding: var(--spacing-xs);
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
}

.btn-icon:hover {
    background: rgba(255, 255, 255, 0.1);
    color: #667eea;
}

.btn-text {
    background: none;
    border: none;
    color: #667eea;
    font-weight: 600;
    font-size: 0.875rem;
    cursor: pointer;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    transition: background var(--transition-fast);
}

.btn-text:hover {
    background: rgba(102, 126, 234, 0.1);
}

/* ===== Main Content ===== */
.main-content {
    padding: var(--spacing-xl) 0;
    min-height: calc(100vh - 200px);
}

/* ===== Layout Wrapper ===== */
.layout-wrapper {
    display: flex;
    gap: var(--spacing-xl);
    align-items: flex-start;
}

.search-content {
    flex: 1;
    min-width: 0;
}

.search-section {
    margin-bottom: var(--spacing-xl);
}

.search-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    backdrop-filter: blur(20px);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-normal);
}

.search-card:hover {
    background: var(--bg-card-hover);
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
}

.search-title {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: var(--spacing-xs);
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.search-subtitle {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
}

.search-form {
    display: grid;
    gap: var(--spacing-md);
}

.input-with-icon {
    position: relative;
    display: flex;
    align-items: center;
}

.input-with-icon input {
    width: 100%;
    padding-right: 60px !important;
}

.search-btn-absolute {
    position: absolute;
    right: 8px;
    top: 50%;
    transform: translateY(-50%);
    display: flex;
    align-items: center;
}

.search-btn-left {
    position: absolute;
    left: 8px;
    top: 50%;
    transform: translateY(-50%);
    display: flex;
    align-items: center;
}

.input-with-icon.left-icon input {
    padding-left: 60px !important;
    padding-right: 1rem !important;
}

.footer-link {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.footer-link:hover {
    color: #667eea;
    text-decoration: underline;
}

.btn-search-icon {
    background: var(--primary-gradient);
    border: none;
    border-radius: var(--radius-sm);
    color: white;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--transition-fast);
    box-shadow: var(--shadow-sm);
}

.btn-search-icon:hover {
    transform: scale(1.05);
    box-shadow: var(--shadow-md);
}

.btn-search-large {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    background: var(--primary-gradient);
    border: none;
    border-radius: var(--radius-md);
    color: white;
    font-size: 1.1rem;
    font-weight: 700;
    cursor: pointer;
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-md);
    margin-top: var(--spacing-sm);
}

.btn-search-large:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    filter: brightness(1.1);
}

.btn-search-large:active {
    transform: translateY(0);
}

.btn-search-large:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

.form-row {
    display: flex;
    gap: var(--spacing-md);
}

.flex-1 {
    flex: 1;
}

.image-upload-area {
    width: 100%;
    min-height: 150px;
    border: 2px dashed var(--border-color);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--transition-fast);
    position: relative;
    padding: var(--spacing-md);
}

.image-upload-area:hover,
.image-upload-area.drag-over {
    border-color: #667eea;
    background: rgba(102, 126, 234, 0.05);
}

.upload-placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--text-muted);
}

.image-preview {
    position: relative;
    width: 100%;
    height: 100%;
    display: flex;
    justify-content: center;
}

.image-preview img {
    max-height: 200px;
    border-radius: var(--radius-sm);
    box-shadow: var(--shadow-md);
}

.btn-remove-image {
    position: absolute;
    top: -10px;
    right: -10px;
    width: 24px;
    height: 24px;
    background: #ef4444;
    color: white;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    box-shadow: var(--shadow-sm);
}

.similarity-badge {
    position: absolute;
    top: 10px;
    right: 10px;
    padding: 4px 8px;
    background: var(--accent-gradient);
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 700;
    color: white;
    box-shadow: var(--shadow-sm);
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.form-group label {
    font-weight: 500;
    color: var(--text-secondary);
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.form-group input,
.form-group select {
    padding: var(--spacing-md);
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 1rem;
    font-family: inherit;
    transition: all var(--transition-fast);
}

.form-group select option {
    background-color: #1a1a2e;
    color: var(--text-primary);
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: #667eea;
    background: rgba(255, 255, 255, 0.08);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.form-group input::placeholder {
    color: var(--text-muted);
}

.keyword-meaning-container {
    margin-top: var(--spacing-xs);
    padding: var(--spacing-xs) var(--spacing-sm);
    background: rgba(102, 126, 234, 0.05);
    border-radius: var(--radius-sm);
    display: flex;
    gap: var(--spacing-sm);
    align-items: center;
    border: 1px solid rgba(102, 126, 234, 0.1);
    animation: fadeIn 0.3s ease;
}

.meaning-label {
    font-size: 0.75rem;
    font-weight: 700;
    color: #667eea;
    text-transform: uppercase;
}

.meaning-text {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.maijia-search-container {
    margin-top: calc(var(--spacing-xs) / 2);
    padding: var(--spacing-xs) var(--spacing-sm);
    background: rgba(79, 172, 254, 0.05);
    border-radius: var(--radius-sm);
    display: flex;
    gap: var(--spacing-sm);
    align-items: center;
    border: 1px solid rgba(79, 172, 254, 0.1);
    animation: fadeIn 0.3s ease;
}

.maijia-search-container svg {
    color: #4facfe;
}

.maijia-search-container a {
    font-size: 0.875rem;
    color: #4facfe;
    text-decoration: none;
    font-weight: 500;
    transition: all var(--transition-fast);
}

.maijia-search-container a:hover {
    color: #00f2fe;
    text-decoration: underline;
}

.btn-search {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--primary-gradient);
    border: none;
    border-radius: var(--radius-md);
    color: white;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-sm);
    margin-top: var(--spacing-sm);
}

.btn-search:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-search:active {
    transform: translateY(0);
}

.btn-search:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

/* ===== Loading State ===== */
.loading-state {
    text-align: center;
    padding: var(--spacing-xl);
}

.spinner {
    width: 48px;
    height: 48px;
    border: 4px solid rgba(102, 126, 234, 0.2);
    border-top-color: #667eea;
    border-radius: 50%;
    margin: 0 auto var(--spacing-md);
    animation: spin 1s linear infinite;
}

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

.link-loader {
    width: 20px;
    height: 20px;
    border: 2px solid rgba(102, 126, 234, 0.2);
    border-top-color: #667eea;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin-right: 12px;
}

.loading-fade {
    opacity: 0.7;
    pointer-events: none;
}

.highlight-flash {
    animation: highlightFlash 1s ease;
}

@keyframes highlightFlash {
    0% {
        background-color: rgba(102, 126, 234, 0.2);
    }

    100% {
        background-color: transparent;
    }
}

/* ===== Error State ===== */
.error-state {
    text-align: center;
    padding: var(--spacing-xl);
    background: var(--bg-card);
    border: 1px solid rgba(239, 68, 68, 0.3);
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-lg);
}

.error-state svg {
    margin-bottom: var(--spacing-md);
}

.error-state h3 {
    color: #ef4444;
    margin-bottom: var(--spacing-sm);
}

.error-state p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
}

.btn-retry {
    padding: var(--spacing-sm) var(--spacing-lg);
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.3);
    border-radius: var(--radius-sm);
    color: #ef4444;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn-retry:hover {
    background: rgba(239, 68, 68, 0.2);
}

/* ===== Results Section ===== */
.results-section {
    animation: fadeIn 0.5s ease;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.results-meta {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.cached-badge {
    padding: var(--spacing-xs) var(--spacing-sm);
    background: rgba(79, 172, 254, 0.1);
    border: 1px solid rgba(79, 172, 254, 0.3);
    border-radius: var(--radius-sm);
    color: #4facfe;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.result-count {
    padding: var(--spacing-xs) var(--spacing-md);
    background: var(--accent-gradient);
    border-radius: var(--radius-xl);
    font-size: 0.875rem;
    font-weight: 600;
}

.results-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
}

/* ===== Patent Card ===== */
.patent-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: all var(--transition-normal);
    backdrop-filter: blur(20px);
    animation: slideUp 0.5s ease;
}

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

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.patent-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: rgba(102, 126, 234, 0.3);
}

.patent-image-container {
    position: relative;
    width: 100%;
    height: 240px;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.1) 0%, rgba(118, 75, 162, 0.1) 100%);
    overflow: hidden;
}

.patent-image {
    width: 100%;
    height: 100%;
    object-fit: contain;
    transition: transform var(--transition-slow);
}

.patent-card:hover .patent-image {
    transform: scale(1.05);
}

.image-placeholder {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    height: 100%;
    color: var(--text-muted);
    font-size: 0.875rem;
}

.patent-content {
    padding: var(--spacing-md);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.patent-card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-xs);
}

.patent-number {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background: rgba(124, 58, 237, 0.15);
    border: 1px solid rgba(124, 58, 237, 0.3);
    border-radius: 99px;
    font-size: 0.9rem;
    font-weight: 600;
    color: #a78bfa;
}

.patent-number-link:hover .patent-number {
    background: #7c3aed;
    color: white;
    box-shadow: 0 4px 12px rgba(124, 58, 237, 0.3);
}

.patent-title {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.patent-meta {
    display: flex;
    gap: var(--spacing-sm);
    font-size: 0.75rem;
    color: var(--text-muted);
}

.patent-abstract {
    color: var(--text-secondary);
    font-size: 0.875rem;
    line-height: 1.6;
    display: -webkit-box;
    -webkit-line-clamp: 4;
    line-clamp: 4;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* ===== History Sidebar ===== */
.history-sidebar {
    width: 320px;
    background: #1a1a35;
    border-left: 1px solid var(--border-color);
    padding: var(--spacing-md);
    backdrop-filter: blur(20px);
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    z-index: 1000;
    display: flex;
    flex-direction: column;
    transition: transform var(--transition-normal);
    box-shadow: -10px 0 30px rgba(0, 0, 0, 0.5);
    transform: translateX(0);
}

.history-sidebar.hidden-sidebar {
    transform: translateX(100%);
}

.history-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
    z-index: 999;
    transition: opacity var(--transition-normal);
}

.history-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-sm);
    border-bottom: 1px solid var(--border-color);
}

.history-header h3 {
    font-size: 1.125rem;
    font-weight: 600;
}

.history-list {
    overflow-y: auto;
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.history-item {
    padding: var(--spacing-sm);
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.history-item:hover {
    background: rgba(255, 255, 255, 0.08);
    border-color: #667eea;
}

.history-item .history-item-main {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 4px;
}

.history-item .history-keyword {
    font-weight: 600;
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    flex: 1;
}

.history-count {
    background: var(--secondary-gradient);
    color: white;
    font-size: 0.7rem;
    font-weight: 700;
    padding: 2px 6px;
    border-radius: 10px;
    min-width: 18px;
    text-align: center;
    margin-left: var(--spacing-xs);
    box-shadow: 0 2px 4px rgba(245, 87, 108, 0.3);
}

.history-item .history-meta {
    display: flex;
    justify-content: space-between;
    font-size: 0.75rem;
    color: var(--text-muted);
}

.history-empty {
    text-align: center;
    color: var(--text-muted);
    padding: var(--spacing-lg) 0;
    font-style: italic;
}

/* ===== Footer ===== */

/* ===== Utility Classes ===== */
.hidden {
    display: none !important;
}

/* ===== Responsive Design ===== */
@media (max-width: 768px) {
    .results-grid {
        grid-template-columns: 1fr;
    }

    .search-card {
        padding: var(--spacing-lg);
    }

    .search-title {
        font-size: 1.5rem;
    }

    .results-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-sm);
    }
}

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

::-webkit-scrollbar-track {
    background: var(--bg-dark);
}

::-webkit-scrollbar-thumb {
    background: linear-gradient(180deg, #667eea 0%, #764ba2 100%);
    border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(180deg, #7c8ef0 0%, #8a5bb0 100%);
}

/* ===== Image Preview Modal ===== */
.image-modal {
    display: none;
    position: fixed;
    z-index: 1000;
    padding-top: 60px;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgba(0, 0, 0, 0.9);
    backdrop-filter: blur(8px);
    cursor: zoom-out;
}

.modal-content {
    margin: auto;
    display: block;
    max-width: 90%;
    max-height: 85vh;
    border-radius: var(--radius-md);
    box-shadow: 0 0 40px rgba(0, 0, 0, 0.5);
    object-fit: contain;
    animation: zoomIn 0.3s ease;
    cursor: default;
}

@keyframes zoomIn {
    from {
        transform: scale(0.9);
        opacity: 0;
    }

    to {
        transform: scale(1);
        opacity: 1;
    }
}

.close-modal {
    position: absolute;
    top: 20px;
    right: 35px;
    color: #f1f1f1;
    font-size: 40px;
    font-weight: bold;
    transition: 0.3s;
    cursor: pointer;
    z-index: 1001;
}

.close-modal:hover,
.close-modal:focus {
    color: #bbb;
    text-decoration: none;
}

#caption {
    margin: auto;
    display: block;
    width: 80%;
    max-width: 700px;
    text-align: center;
    color: var(--text-secondary);
    padding: 15px 0;
    font-size: 1rem;
}

/* Update patent image cursor */
.patent-image {
    cursor: zoom-in;
}

@keyframes highlightFlash {
    0% {
        background: rgba(102, 126, 234, 0.4);
    }

    100% {
        background: rgba(255, 255, 255, 0.05);
    }
}

.highlight-flash {
    animation: highlightFlash 1s ease-out;
}

/* ===== AdSense Styling ===== */
.ad-container-top {
    margin: var(--spacing-md) 0;
    padding: var(--spacing-sm);
    background: rgba(255, 255, 255, 0.02);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    min-height: 90px;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.ad-label {
    font-size: 0.65rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 4px;
    text-align: center;
}