/* CSS Variables */
:root {
    --primary-color: #6366f1;
    --primary-hover: #4f46e5;
    --secondary-color: #64748b;
    --background: #f8fafc;
    --surface: #ffffff;
    --surface-hover: #f1f5f9;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --border-color: #e2e8f0;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --transition: 150ms ease;
}

/* Reset */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

/* Base Styles */
html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--background);
    color: var(--text-primary);
    line-height: 1.5;
    min-height: 100vh;
}

/* App Container */
.app-container {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 1rem;
}

/* Header */
.header {
    text-align: center;
    padding: 2rem 1rem;
}

.logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    margin-bottom: 0.5rem;
}

.logo-img {
    width: 48px;
    height: 48px;
    object-fit: contain;
}

.header h1 {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
}

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

/* Main Content */
.main-content {
    flex: 1;
    padding-bottom: 2rem;
}

/* Search Section */
.search-section {
    margin-bottom: 1.5rem;
}

.search-container {
    position: relative;
    max-width: 600px;
    margin: 0 auto;
}

.search-input {
    width: 100%;
    padding: 1rem 3rem 1rem 1.25rem;
    font-size: 1rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    background: var(--surface);
    color: var(--text-primary);
    transition: border-color var(--transition), box-shadow var(--transition);
}

.search-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.search-input::placeholder {
    color: var(--text-secondary);
}

.clear-search {
    position: absolute;
    right: 0.75rem;
    top: 50%;
    transform: translateY(-50%);
    width: 2rem;
    height: 2rem;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    font-size: 1.5rem;
    cursor: pointer;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: color var(--transition), background-color var(--transition);
}

.clear-search:hover {
    color: var(--text-primary);
    background-color: var(--surface-hover);
}

/* Section Titles */
.section-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 1rem;
}

/* Recent Characters Section */
.recent-section {
    margin-bottom: 2rem;
    padding: 1.25rem;
    background: var(--surface);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
}

.recent-characters {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.recent-char {
    width: 3rem;
    height: 3rem;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    background: var(--surface-hover);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition);
}

.recent-char:hover {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
    transform: scale(1.1);
}

.clear-recent-btn {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
    color: var(--text-secondary);
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition);
}

.clear-recent-btn:hover {
    background: var(--surface-hover);
    color: var(--text-primary);
}

/* Category Section */
.category-section {
    margin-bottom: 1.5rem;
}

.category-tabs {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.category-tab {
    padding: 0.625rem 1rem;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
    background: var(--surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition);
    white-space: nowrap;
}

.category-tab:hover {
    background: var(--surface-hover);
    color: var(--text-primary);
}

.category-tab.active {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

/* Characters Grid */
.characters-section {
    background: var(--surface);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    box-shadow: var(--shadow-sm);
    min-height: 300px;
}

.characters-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(60px, 1fr));
    gap: 0.5rem;
}

.char-item {
    aspect-ratio: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.75rem;
    background: var(--background);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition);
    position: relative;
}

.char-item:hover {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
    transform: scale(1.1);
    z-index: 1;
    box-shadow: var(--shadow-md);
}

.char-item:active {
    transform: scale(1.05);
}

/* Loading & No Results */
.loading-indicator,
.no-results {
    text-align: center;
    padding: 3rem;
    color: var(--text-secondary);
    font-size: 1rem;
}

/* Modal */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    padding: 1rem;
    backdrop-filter: blur(4px);
}

.modal-content {
    background: var(--surface);
    border-radius: var(--radius-lg);
    max-width: 420px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-lg);
    position: relative;
    animation: modalSlideIn 200ms ease;
}

@keyframes modalSlideIn {
    from {
        opacity: 0;
        transform: translateY(-20px) scale(0.95);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

.modal-close {
    position: absolute;
    top: 1rem;
    right: 1rem;
    width: 2rem;
    height: 2rem;
    border: none;
    background: var(--surface-hover);
    color: var(--text-secondary);
    font-size: 1.25rem;
    border-radius: var(--radius-sm);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition);
    z-index: 1;
}

.modal-close:hover {
    background: var(--border-color);
    color: var(--text-primary);
}

.modal-char-display {
    padding: 3rem;
    text-align: center;
    background: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%);
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}

.modal-char {
    font-size: 6rem;
    line-height: 1;
    display: inline-block;
}

.modal-info {
    padding: 1.5rem;
}

.modal-name {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 1.25rem;
    color: var(--text-primary);
    text-align: center;
}

.info-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.info-item {
    background: var(--background);
    padding: 0.75rem;
    border-radius: var(--radius-md);
}

.info-label {
    display: block;
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 0.25rem;
}

.info-value {
    display: block;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-primary);
    font-family: 'SF Mono', Monaco, 'Cascadia Code', monospace;
    word-break: break-all;
}

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

/* Buttons */
.btn {
    flex: 1;
    min-width: 100px;
    padding: 0.75rem 1rem;
    font-size: 0.875rem;
    font-weight: 500;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition);
}

.btn-primary {
    background: var(--primary-color);
    color: white;
}

.btn-primary:hover {
    background: var(--primary-hover);
}

.btn-secondary {
    background: var(--surface-hover);
    color: var(--text-primary);
}

.btn-secondary:hover {
    background: var(--border-color);
}

/* Toast */
.toast {
    position: fixed;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    padding: 0.875rem 1.5rem;
    background: var(--text-primary);
    color: white;
    border-radius: var(--radius-md);
    font-size: 0.9rem;
    font-weight: 500;
    box-shadow: var(--shadow-lg);
    z-index: 1100;
    animation: toastSlideIn 200ms ease;
}

@keyframes toastSlideIn {
    from {
        opacity: 0;
        transform: translateX(-50%) translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateX(-50%) translateY(0);
    }
}

/* Footer */
.footer {
    text-align: center;
    padding: 1.5rem;
    border-top: 1px solid var(--border-color);
    margin-top: auto;
}

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

.footer a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
    transition: color var(--transition);
}

.footer a:hover {
    color: var(--primary-hover);
    text-decoration: underline;
}

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

/* Responsive Design */
@media (max-width: 768px) {
    .header {
        padding: 1.5rem 0.5rem;
    }

    .header h1 {
        font-size: 1.5rem;
    }

    .tagline {
        font-size: 1rem;
    }

    .search-input {
        padding: 0.875rem 2.5rem 0.875rem 1rem;
    }

    .category-tabs {
        gap: 0.375rem;
    }

    .category-tab {
        padding: 0.5rem 0.75rem;
        font-size: 0.8125rem;
    }

    .characters-grid {
        grid-template-columns: repeat(auto-fill, minmax(50px, 1fr));
        gap: 0.375rem;
    }

    .char-item {
        font-size: 1.5rem;
    }

    .recent-char {
        width: 2.5rem;
        height: 2.5rem;
        font-size: 1.25rem;
    }

    .modal-char {
        font-size: 4rem;
    }

    .modal-char-display {
        padding: 2rem;
    }

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

    .modal-actions {
        flex-direction: column;
    }

    .btn {
        width: 100%;
    }
}

@media (max-width: 480px) {
    .app-container {
        padding: 0 0.5rem;
    }

    .characters-section {
        padding: 1rem;
    }

    .characters-grid {
        grid-template-columns: repeat(auto-fill, minmax(45px, 1fr));
    }

    .char-item {
        font-size: 1.25rem;
    }

    .category-tab {
        padding: 0.5rem 0.625rem;
        font-size: 0.75rem;
    }
}

/* Print Styles */
@media print {
    .search-section,
    .recent-section,
    .category-section,
    .modal,
    .toast {
        display: none;
    }

    .characters-grid {
        grid-template-columns: repeat(10, 1fr);
    }

    .char-item {
        border: 1px solid #ccc;
        page-break-inside: avoid;
    }
}