/* Enhanced Case Converter Styles */

/* CSS Variables */
:root {
    --primary-bg: #0a0a0a;
    --secondary-bg: #1a1a1a;
    --card-bg: rgba(26, 26, 26, 0.9);
    --text-primary: #ffffff;
    --text-secondary: #b0b0b0;
    --text-muted: #666666;
    --accent-color: #00f0ff;
    --accent-secondary: #ff6b6b;
    --accent-success: #51cf66;
    --accent-warning: #ffd43b;
    --accent-glow: rgba(0, 240, 255, 0.3);
    --border-color: rgba(255, 255, 255, 0.1);
    --border-active: rgba(0, 240, 255, 0.5);
    --success-color: #00ff88;
    --warning-color: #ffa500;
    --danger-color: #ff4757;
    --font-primary: 'Inter', sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
    --border-radius: 16px;
    --border-radius-sm: 8px;
    --border-radius-lg: 24px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.15);
    --shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.2);
    --shadow-glow: 0 0 30px var(--accent-glow);
}

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

body {
    font-family: var(--font-primary);
    background: var(--primary-bg);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    min-height: 100vh;
}

/* Particles Background */
#particles-js {
    position: fixed;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    z-index: -1;
    background: linear-gradient(135deg, #0a0a0a 0%, #1a1a1a 50%, #0f0f0f 100%);
}

/* Enhanced Navigation Header */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(10, 10, 10, 0.95);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 80px;
}

.nav-left {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-weight: 700;
    font-size: 1.25rem;
}

.logo-icon {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--accent-color), var(--accent-secondary));
    border-radius: var(--border-radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    box-shadow: var(--shadow-glow);
}

.logo-text {
    background: linear-gradient(135deg, var(--text-primary), var(--accent-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-divider {
    width: 1px;
    height: 30px;
    background: var(--border-color);
}

.back-link {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1.5rem;
    background: rgba(0, 240, 255, 0.1);
    border: 1px solid rgba(0, 240, 255, 0.3);
    border-radius: var(--border-radius);
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.back-link::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
    transition: left 0.5s;
}

.back-link:hover::before {
    left: 100%;
}

.back-link:hover {
    background: rgba(0, 240, 255, 0.2);
    border-color: var(--accent-color);
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow);
}

.back-icon {
    width: 32px;
    height: 32px;
    background: var(--accent-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary-bg);
    font-size: 0.9rem;
}

.nav-center {
    flex: 1;
    display: flex;
    justify-content: center;
}

.tool-info {
    text-align: center;
}

.tool-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 0.25rem;
    background: linear-gradient(135deg, var(--text-primary), var(--accent-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.tool-category {
    font-size: 0.875rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.nav-right {
    display: flex;
    align-items: center;
}

.nav-actions {
    display: flex;
    gap: 0.5rem;
}

.action-icon {
    width: 44px;
    height: 44px;
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
    font-size: 1.1rem;
}

.action-icon:hover {
    background: rgba(0, 240, 255, 0.1);
    border-color: var(--accent-color);
    color: var(--accent-color);
    transform: translateY(-2px);
}

.nav-progress {
    height: 3px;
    background: var(--border-color);
    position: relative;
    overflow: hidden;
}

.progress-bar {
    height: 100%;
    background: linear-gradient(90deg, var(--accent-color), var(--accent-secondary));
    width: 0%;
    transition: width 0.3s ease;
    box-shadow: 0 0 10px var(--accent-color);
}

/* Main Content */
.main-content {
    padding: 100px 20px 60px;
    min-height: 100vh;
    position: relative;
    z-index: 1;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
}

/* Enhanced Tool Header */
.tool-header {
    margin-bottom: 3rem;
    position: relative;
}

.header-glow {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 600px;
    height: 400px;
    background: radial-gradient(circle, var(--accent-glow) 0%, transparent 70%);
    z-index: -1;
    animation: pulse 4s ease-in-out infinite;
}

.header-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2rem;
}

.title-section {
    display: flex;
    align-items: center;
    gap: 2rem;
    text-align: center;
}

.tool-icon {
    position: relative;
}

.icon-wrapper {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--accent-color), var(--accent-secondary));
    border-radius: var(--border-radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    color: var(--primary-bg);
    position: relative;
    overflow: hidden;
}

.icon-glow {
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.2) 0%, transparent 70%);
    animation: rotate 3s linear infinite;
}

.title-info {
    flex: 1;
}

.main-title {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 800;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, var(--text-primary), var(--accent-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subtitle {
    font-size: 1.2rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    width: 100%;
    max-width: 800px;
}

.feature-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1rem 1.5rem;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    backdrop-filter: blur(10px);
    transition: var(--transition);
}

.feature-item:hover {
    border-color: var(--accent-color);
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow);
}

.feature-item i {
    color: var(--accent-color);
    font-size: 1.2rem;
}

/* Glass Card Effect */
.glass-card {
    background: var(--card-bg);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.glass-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
}

.glass-card:hover {
    border-color: rgba(0, 240, 255, 0.3);
    box-shadow: var(--shadow-lg), var(--shadow-glow);
    transform: translateY(-2px);
}

/* Converter Layout */
.converter-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    margin-bottom: 2rem;
}

.left-panel,
.right-panel {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

/* Section Headers */
.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
    gap: 1rem;
    padding: 1.5rem 1.5rem 0;
}

.section-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.section-title i {
    color: var(--accent-color);
    font-size: 1.1rem;
}

/* Text Statistics */
.text-stats {
    display: flex;
    gap: 1.5rem;
    font-size: 0.875rem;
    color: var(--text-secondary);
    font-family: var(--font-mono);
    flex-wrap: wrap;
}

/* Enhanced Textareas */
.textarea-container {
    position: relative;
    padding: 0 1.5rem 1.5rem;
}

.input-textarea,
.output-textarea {
    width: 100%;
    background: rgba(0, 0, 0, 0.6);
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    color: var(--text-primary);
    font-family: var(--font-mono);
    font-size: 1rem;
    line-height: 1.6;
    resize: vertical;
    min-height: 250px;
    transition: var(--transition);
    outline: none;
}

.input-textarea:focus,
.output-textarea:focus {
    border-color: var(--accent-color);
    box-shadow: var(--shadow-glow);
    background: rgba(0, 0, 0, 0.8);
}

.input-textarea::placeholder,
.output-textarea::placeholder {
    color: var(--text-muted);
    opacity: 0.7;
}

.textarea-actions {
    position: absolute;
    top: 1rem;
    right: 2rem;
    display: flex;
    gap: 0.5rem;
    opacity: 0;
    transition: var(--transition);
}

.textarea-container:hover .textarea-actions {
    opacity: 1;
}

.text-action {
    width: 32px;
    height: 32px;
    background: rgba(0, 0, 0, 0.8);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
    font-size: 0.875rem;
}

.text-action:hover {
    background: var(--accent-color);
    color: var(--primary-bg);
    border-color: var(--accent-color);
}

/* Advanced Options */
.options-section {
    padding: 1.5rem;
}

.options-grid {
    display: grid;
    gap: 1.5rem;
}

.option-group {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.option-label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.option-select {
    background: rgba(0, 0, 0, 0.6);
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    padding: 0.75rem 1rem;
    color: var(--text-primary);
    font-family: var(--font-primary);
    outline: none;
    transition: var(--transition);
}

.option-select:focus {
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

.checkbox-group {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    cursor: pointer;
    font-size: 0.875rem;
    color: var(--text-secondary);
    transition: var(--transition);
}

.checkbox-label:hover {
    color: var(--text-primary);
}

.checkbox-label input[type="checkbox"] {
    display: none;
}

.checkmark {
    width: 20px;
    height: 20px;
    background: rgba(0, 0, 0, 0.6);
    border: 2px solid var(--border-color);
    border-radius: 4px;
    position: relative;
    transition: var(--transition);
}

.checkbox-label input[type="checkbox"]:checked + .checkmark {
    background: var(--accent-color);
    border-color: var(--accent-color);
}

.checkbox-label input[type="checkbox"]:checked + .checkmark::after {
    content: '';
    position: absolute;
    left: 6px;
    top: 2px;
    width: 6px;
    height: 12px;
    border: solid var(--primary-bg);
    border-width: 0 2px 2px 0;
    transform: rotate(45deg);
}

/* Conversion Section */
.conversion-section {
    padding: 1.5rem;
}

.conversion-search {
    position: relative;
    max-width: 300px;
}

.search-input {
    width: 100%;
    background: rgba(0, 0, 0, 0.6);
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 0.75rem 1rem 0.75rem 2.5rem;
    color: var(--text-primary);
    font-family: var(--font-primary);
    font-size: 0.875rem;
    outline: none;
    transition: var(--transition);
}

.search-input:focus {
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

.search-icon {
    position: absolute;
    left: 0.875rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
    font-size: 0.875rem;
}

.conversion-categories {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.category-group {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.category-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--border-color);
}

/* Enhanced Conversion Buttons */
.conversion-buttons {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
}

.conversion-btn {
    background: linear-gradient(135deg, rgba(0, 240, 255, 0.05), rgba(0, 240, 255, 0.02));
    border: 2px solid rgba(0, 240, 255, 0.2);
    border-radius: var(--border-radius);
    padding: 1.25rem;
    color: var(--text-primary);
    font-family: var(--font-primary);
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 0.75rem;
    position: relative;
    overflow: hidden;
    text-align: left;
}

.conversion-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.05), transparent);
    transition: left 0.6s;
}

.conversion-btn:hover::before {
    left: 100%;
}

.conversion-btn i {
    font-size: 1.25rem;
    transition: var(--transition);
}

.conversion-btn span {
    font-weight: 600;
    font-size: 1rem;
}

.btn-example {
    font-size: 0.75rem;
    color: var(--text-muted);
    font-family: var(--font-mono);
    background: rgba(0, 0, 0, 0.3);
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    margin-top: auto;
}

.conversion-btn:hover {
    background: linear-gradient(135deg, rgba(0, 240, 255, 0.15), rgba(0, 240, 255, 0.08));
    border-color: var(--accent-color);
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow);
}

.conversion-btn:hover i {
    color: var(--accent-color);
    transform: scale(1.1);
}

.conversion-btn.active {
    background: linear-gradient(135deg, var(--accent-color), rgba(0, 240, 255, 0.8));
    color: var(--primary-bg);
    border-color: var(--accent-color);
    box-shadow: var(--shadow-glow);
}

.conversion-btn.active i,
.conversion-btn.active .btn-example {
    color: var(--primary-bg);
}

/* Category-specific styling */
.conversion-btn.basic {
    border-color: rgba(81, 207, 102, 0.3);
}

.conversion-btn.basic:hover {
    border-color: var(--accent-success);
    box-shadow: 0 0 20px rgba(81, 207, 102, 0.3);
}

.conversion-btn.programming {
    border-color: rgba(255, 212, 59, 0.3);
}

.conversion-btn.programming:hover {
    border-color: var(--accent-warning);
    box-shadow: 0 0 20px rgba(255, 212, 59, 0.3);
}

.conversion-btn.special {
    border-color: rgba(255, 107, 107, 0.3);
}

.conversion-btn.special:hover {
    border-color: var(--accent-secondary);
    box-shadow: 0 0 20px rgba(255, 107, 107, 0.3);
}

/* Output Section */
.output-section {
    padding: 1.5rem;
}

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

.action-btn {
    padding: 0.75rem 1.5rem;
    border: 2px solid;
    border-radius: var(--border-radius);
    font-family: var(--font-primary);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    text-decoration: none;
    background: transparent;
    position: relative;
    overflow: hidden;
}

.action-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
    transition: left 0.5s;
}

.action-btn:hover::before {
    left: 100%;
}

.copy-btn {
    border-color: var(--success-color);
    color: var(--success-color);
}

.copy-btn:hover {
    background: var(--success-color);
    color: var(--primary-bg);
    box-shadow: 0 0 20px rgba(0, 255, 136, 0.3);
    transform: translateY(-2px);
}

.download-btn {
    border-color: var(--accent-color);
    color: var(--accent-color);
}

.download-btn:hover {
    background: var(--accent-color);
    color: var(--primary-bg);
    box-shadow: var(--shadow-glow);
    transform: translateY(-2px);
}

.share-btn {
    border-color: var(--accent-secondary);
    color: var(--accent-secondary);
}

.share-btn:hover {
    background: var(--accent-secondary);
    color: var(--primary-bg);
    box-shadow: 0 0 20px rgba(255, 107, 107, 0.3);
    transform: translateY(-2px);
}

.action-btn.danger {
    border-color: var(--danger-color);
    color: var(--danger-color);
}

.action-btn.danger:hover {
    background: var(--danger-color);
    color: var(--primary-bg);
    box-shadow: 0 0 20px rgba(255, 71, 87, 0.3);
    transform: translateY(-2px);
}

.output-stats {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 1rem;
    padding: 0.75rem 1rem;
    background: rgba(0, 0, 0, 0.3);
    border-radius: var(--border-radius-sm);
    font-size: 0.75rem;
    color: var(--text-muted);
    font-family: var(--font-mono);
    flex-wrap: wrap;
    gap: 1rem;
}

/* History Panel */
.history-panel {
    padding: 1.5rem;
}

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

.history-list {
    max-height: 300px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.history-empty {
    text-align: center;
    padding: 2rem;
    color: var(--text-muted);
}

.history-empty i {
    font-size: 2rem;
    margin-bottom: 1rem;
    opacity: 0.5;
}

.history-item {
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    padding: 1rem;
    transition: var(--transition);
    cursor: pointer;
}

.history-item:hover {
    border-color: var(--accent-color);
    background: rgba(0, 240, 255, 0.05);
}

.history-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.5rem;
}

.history-type {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--accent-color);
    text-transform: uppercase;
}

.history-time {
    font-size: 0.75rem;
    color: var(--text-muted);
    font-family: var(--font-mono);
}

.history-text {
    font-size: 0.875rem;
    color: var(--text-secondary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* Enhanced Toast Notifications */
.toast-container {
    position: fixed;
    top: 100px;
    right: 30px;
    z-index: 2000;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.toast {
    background: var(--card-bg);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 1rem 1.5rem;
    display: flex;
    align-items: center;
    gap: 1rem;
    min-width: 300px;
    box-shadow: var(--shadow-lg);
    transform: translateX(100%);
    opacity: 0;
    transition: var(--transition);
    position: relative;
}

.toast.show {
    transform: translateX(0);
    opacity: 1;
}

.toast-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: var(--success-color);
    color: var(--primary-bg);
    font-size: 1rem;
}

.toast-content {
    flex: 1;
}

.toast-title {
    font-weight: 600;
    font-size: 0.875rem;
    margin-bottom: 0.25rem;
}

.toast-message {
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.toast-close {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 0.25rem;
    border-radius: 4px;
    transition: var(--transition);
}

.toast-close:hover {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
}

/* Modal Styles */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 3000;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
}

.modal.show {
    opacity: 1;
    visibility: visible;
}

.modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(10px);
}

.modal-content {
    background: var(--card-bg);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    padding: 2rem;
    max-width: 600px;
    max-height: 80vh;
    overflow-y: auto;
    position: relative;
    box-shadow: var(--shadow-lg);
    transform: scale(0.9);
    transition: var(--transition);
}

.modal.show .modal-content {
    transform: scale(1);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
}

.modal-header h3 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
}

.modal-close {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 0.5rem;
    border-radius: var(--border-radius-sm);
    transition: var(--transition);
    font-size: 1.25rem;
}

.modal-close:hover {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
}

.modal-body {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.help-section h4 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 1rem;
}

.shortcut-list {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.shortcut-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem;
    background: rgba(0, 0, 0, 0.3);
    border-radius: var(--border-radius-sm);
}

.shortcut-item kbd {
    background: var(--text-primary);
    color: var(--primary-bg);
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 600;
    margin: 0 0.25rem;
}

.conversion-help {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.help-item {
    padding: 0.75rem;
    background: rgba(0, 0, 0, 0.3);
    border-radius: var(--border-radius-sm);
    font-size: 0.875rem;
    line-height: 1.5;
}

.help-item strong {
    color: var(--accent-color);
}

/* Animations */
@keyframes pulse {
    0%, 100% { opacity: 0.3; transform: translate(-50%, -50%) scale(1); }
    50% { opacity: 0.5; transform: translate(-50%, -50%) scale(1.1); }
}

@keyframes rotate {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

/* Responsive Design */
@media (max-width: 1200px) {
    .converter-layout {
        grid-template-columns: 1fr;
    }
    
    .feature-grid {
        grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    }
}

@media (max-width: 768px) {
    .main-content {
        padding: 100px 15px 40px;
    }
    
    .nav-container {
        padding: 0 1rem;
        height: 70px;
    }
    
    .nav-left {
        gap: 1rem;
    }
    
    .nav-logo {
        display: none;
    }
    
    .nav-divider {
        display: none;
    }
    
    .tool-title {
        font-size: 1.25rem;
    }
    
    .tool-category {
        display: none;
    }
    
    .title-section {
        flex-direction: column;
        gap: 1rem;
    }
    
    .conversion-buttons {
        grid-template-columns: 1fr;
    }
    
    .section-header {
        flex-direction: column;
        align-items: flex-start;
        padding: 1rem 1rem 0;
    }
    
    .output-actions,
    .history-actions {
        width: 100%;
        justify-content: stretch;
    }
    
    .action-btn {
        flex: 1;
        justify-content: center;
    }
    
    .textarea-container {
        padding: 0 1rem 1rem;
    }
    
    .input-textarea,
    .output-textarea {
        min-height: 200px;
        padding: 1rem;
    }
    
    .text-stats {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .toast-container {
        top: 90px;
        right: 15px;
        left: 15px;
    }
    
    .toast {
        min-width: auto;
        transform: translateY(-100%);
    }
    
    .toast.show {
        transform: translateY(0);
    }
    
    .modal-content {
        margin: 1rem;
        padding: 1.5rem;
        max-height: 90vh;
    }
}

@media (max-width: 480px) {
    .back-link .back-text {
        display: none;
    }
    
    .nav-actions {
        gap: 0.25rem;
    }
    
    .action-icon {
        width: 40px;
        height: 40px;
    }
    
    .conversion-btn {
        padding: 1rem;
    }
    
    .shortcut-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.5rem;
    }
}