/* ===== CSS Variables ===== */
:root {
    --bg-primary: #0a0a0f;
    --bg-secondary: #12121a;
    --bg-card: rgba(255, 255, 255, 0.03);
    --bg-card-hover: rgba(255, 255, 255, 0.06);
    --glass: rgba(255, 255, 255, 0.05);
    --glass-border: rgba(255, 255, 255, 0.1);
    --text-primary: #ffffff;
    --text-secondary: rgba(255, 255, 255, 0.7);
    --text-muted: rgba(255, 255, 255, 0.4);
    --accent: #6366f1;
    --accent-light: #818cf8;
    --accent-glow: rgba(99, 102, 241, 0.3);
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --border-radius: 16px;
    --border-radius-sm: 10px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 16px 64px rgba(0, 0, 0, 0.4);
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

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

/* Background Animation */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background:
        radial-gradient(ellipse at 20% 20%, rgba(99, 102, 241, 0.15) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 80%, rgba(139, 92, 246, 0.1) 0%, transparent 50%),
        radial-gradient(ellipse at 50% 50%, rgba(59, 130, 246, 0.05) 0%, transparent 70%);
    pointer-events: none;
    z-index: -1;
}

.hidden {
    display: none !important;
}

/* ===== App Container ===== */
.app-container {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* ===== Header ===== */
.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
    background: var(--glass);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--glass-border);
    position: sticky;
    top: 0;
    z-index: 100;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.logo-icon {
    font-size: 1.75rem;
}

.logo h1 {
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -0.5px;
}

.logo .accent {
    background: linear-gradient(135deg, var(--accent) 0%, var(--accent-light) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.search-box {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: var(--bg-card);
    border: 1px solid var(--glass-border);
    border-radius: var(--border-radius-sm);
    transition: var(--transition);
}

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

.search-icon {
    font-size: 0.875rem;
    opacity: 0.5;
}

.search-box input {
    background: transparent;
    border: none;
    outline: none;
    color: var(--text-primary);
    font-size: 0.875rem;
    width: 200px;
}

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

.lang-btn {
    padding: 0.5rem 1rem;
    background: linear-gradient(135deg, var(--accent) 0%, var(--accent-light) 100%);
    border: none;
    border-radius: var(--border-radius-sm);
    color: white;
    font-weight: 600;
    font-size: 0.75rem;
    cursor: pointer;
    transition: var(--transition);
}

.lang-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 20px var(--accent-glow);
}

/* ===== Main Content ===== */
.main-content {
    display: flex;
    flex: 1;
}

/* ===== Sidebar ===== */
.sidebar {
    width: 240px;
    padding: 1.5rem 1rem;
    background: var(--bg-secondary);
    border-right: 1px solid var(--glass-border);
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.nav-section {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.nav-divider {
    height: 1px;
    background: var(--glass-border);
    margin: 0.75rem 0;
}

.nav-btn {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.875rem 1rem;
    background: transparent;
    border: none;
    border-radius: var(--border-radius-sm);
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    text-align: left;
    width: 100%;
}

.nav-btn:hover {
    background: var(--bg-card-hover);
    color: var(--text-primary);
}

.nav-btn.active {
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.2) 0%, rgba(139, 92, 246, 0.1) 100%);
    color: var(--accent-light);
    border: 1px solid rgba(99, 102, 241, 0.3);
}

.nav-icon {
    font-size: 1.1rem;
}

/* ===== Tools Area ===== */
.tools-area {
    flex: 1;
    padding: 2rem;
    overflow-y: auto;
}

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

.tools-header h2 {
    font-size: 1.5rem;
    font-weight: 600;
}

.tool-count {
    color: var(--text-muted);
    font-size: 0.875rem;
}

/* ===== Tools Grid ===== */
.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 1.25rem;
}

.tool-card {
    position: relative;
    padding: 1.5rem;
    background: var(--bg-card);
    border: 1px solid var(--glass-border);
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
    overflow: hidden;
}

.tool-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--accent), var(--accent-light));
    opacity: 0;
    transition: var(--transition);
}

.tool-card:hover {
    background: var(--bg-card-hover);
    border-color: rgba(99, 102, 241, 0.3);
    transform: translateY(-4px);
    box-shadow: var(--shadow);
}

.tool-card:hover::before {
    opacity: 1;
}

.tool-icon {
    font-size: 2rem;
    margin-bottom: 0.75rem;
}

.tool-card h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 0.375rem;
}

.tool-card p {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.favorite-btn {
    position: absolute;
    top: 0.75rem;
    right: 0.75rem;
    background: transparent;
    border: none;
    font-size: 1.25rem;
    cursor: pointer;
    opacity: 0;
    transition: var(--transition);
    color: var(--text-muted);
}

.tool-card:hover .favorite-btn {
    opacity: 1;
}

.favorite-btn:hover {
    color: var(--warning);
    transform: scale(1.2);
}

.favorite-btn.active {
    opacity: 1;
    color: var(--warning);
}

/* ===== Modal ===== */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(8px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    padding: 2rem;
}

.modal {
    width: 100%;
    max-width: 800px;
    max-height: 90vh;
    background: var(--bg-secondary);
    border: 1px solid var(--glass-border);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    animation: modalIn 0.3s ease;
}

@keyframes modalIn {
    from {
        opacity: 0;
        transform: scale(0.95) translateY(20px);
    }

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

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.25rem 1.5rem;
    border-bottom: 1px solid var(--glass-border);
}

.modal-title {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.modal-icon {
    font-size: 1.5rem;
}

.modal-header h2 {
    font-size: 1.25rem;
    font-weight: 600;
}

.modal-close {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-card);
    border: 1px solid var(--glass-border);
    border-radius: 50%;
    color: var(--text-secondary);
    font-size: 1rem;
    cursor: pointer;
    transition: var(--transition);
}

.modal-close:hover {
    background: var(--danger);
    border-color: var(--danger);
    color: white;
}

.modal-body {
    flex: 1;
    padding: 1.5rem;
    overflow-y: auto;
}

/* ===== Tool UI Components ===== */
.tool-section {
    margin-bottom: 1.5rem;
}

.tool-section:last-child {
    margin-bottom: 0;
}

.tool-label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.tool-textarea {
    width: 100%;
    min-height: 120px;
    padding: 1rem;
    background: var(--bg-card);
    border: 1px solid var(--glass-border);
    border-radius: var(--border-radius-sm);
    color: var(--text-primary);
    font-family: 'Fira Code', 'Consolas', monospace;
    font-size: 0.875rem;
    line-height: 1.5;
    resize: vertical;
    transition: var(--transition);
}

.tool-textarea:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

.tool-textarea::placeholder {
    color: var(--text-muted);
}

.tool-input {
    width: 100%;
    padding: 0.875rem 1rem;
    background: var(--bg-card);
    border: 1px solid var(--glass-border);
    border-radius: var(--border-radius-sm);
    color: var(--text-primary);
    font-size: 0.9rem;
    transition: var(--transition);
}

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

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

.tool-btn {
    padding: 0.75rem 1.5rem;
    background: linear-gradient(135deg, var(--accent) 0%, var(--accent-light) 100%);
    border: none;
    border-radius: var(--border-radius-sm);
    color: white;
    font-weight: 600;
    font-size: 0.875rem;
    cursor: pointer;
    transition: var(--transition);
}

.tool-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 20px var(--accent-glow);
}

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

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

.tool-btn.success {
    background: linear-gradient(135deg, var(--success) 0%, #34d399 100%);
}

.tool-result {
    padding: 1rem;
    background: rgba(16, 185, 129, 0.1);
    border: 1px solid rgba(16, 185, 129, 0.3);
    border-radius: var(--border-radius-sm);
    color: var(--success);
    font-family: 'Fira Code', 'Consolas', monospace;
    font-size: 0.875rem;
    word-break: break-all;
}

.tool-row {
    display: flex;
    gap: 1rem;
    align-items: flex-start;
}

.tool-row>* {
    flex: 1;
}

/* File Drop Zone */
.drop-zone {
    border: 2px dashed var(--glass-border);
    border-radius: var(--border-radius);
    padding: 3rem 2rem;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
}

.drop-zone:hover,
.drop-zone.dragover {
    border-color: var(--accent);
    background: rgba(99, 102, 241, 0.05);
}

.drop-zone-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.drop-zone-text {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.drop-zone-hint {
    color: var(--text-muted);
    font-size: 0.8rem;
    margin-top: 0.5rem;
}

/* Image Preview */
.image-preview {
    max-width: 100%;
    max-height: 300px;
    border-radius: var(--border-radius-sm);
    margin: 1rem 0;
}

/* Color Preview */
.color-preview-box {
    width: 100%;
    height: 80px;
    border-radius: var(--border-radius-sm);
    border: 1px solid var(--glass-border);
    margin-bottom: 1rem;
}

/* ===== Toast ===== */
#toast-container {
    position: fixed;
    top: 80px;
    right: 20px;
    z-index: 9999;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.toast {
    padding: 12px 20px;
    background: var(--bg-secondary);
    border: 1px solid var(--glass-border);
    border-radius: var(--border-radius-sm);
    color: var(--text-primary);
    font-size: 0.875rem;
    box-shadow: var(--shadow);
    animation: toastIn 0.3s ease;
    display: flex;
    align-items: center;
    gap: 8px;
}

.toast.success {
    border-color: var(--success);
    background: rgba(16, 185, 129, 0.1);
}

.toast.error {
    border-color: var(--danger);
    background: rgba(239, 68, 68, 0.1);
}

@keyframes toastIn {
    from {
        opacity: 0;
        transform: translateX(100%);
    }

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

/* ===== Responsive ===== */
@media (max-width: 768px) {
    .header {
        padding: 1rem;
        flex-wrap: wrap;
        gap: 1rem;
    }

    .search-box {
        order: 3;
        width: 100%;
    }

    .search-box input {
        width: 100%;
    }

    .sidebar {
        display: none;
    }

    .tools-area {
        padding: 1rem;
    }

    .tools-grid {
        grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
        gap: 0.75rem;
    }

    .tool-card {
        padding: 1rem;
    }

    .tool-icon {
        font-size: 1.5rem;
    }

    .modal {
        max-height: 95vh;
        margin: 0.5rem;
    }

    .tool-row {
        flex-direction: column;
    }
}