/* ==========================================================================
   Tools Design System - Zhween Brand
   Shared styles for all classroom tools
   
   This file provides:
   - Tool-scoped CSS variables (inheriting from base.css)
   - Reusable UI components (buttons, inputs, panels)
   - Utility classes for common patterns
   - Shared animations and keyframes
   ========================================================================== */

/* ==========================================================================
   1. TOOL-SCOPED VARIABLES
   These inherit from base.css but can be overridden per-tool
   ========================================================================== */

.tool-content-area {
    /* Primary Colors (inherited from base.css, re-declared for scoping) */
    --t-primary: var(--primary-color, #15aebf);
    --t-primary-light: var(--primary-light, #4ecdc4);
    --t-primary-dark: var(--primary-dark, #0e9bb2);
    --t-primary-rgb: var(--primary-rgb, 21, 174, 191);
    
    /* Secondary Colors */
    --t-secondary: var(--secondary-color, #ff6b35);
    --t-accent: var(--accent-color, #ffd93d);
    
    /* Semantic Colors */
    --t-success: var(--success-color, #00b894);
    --t-danger: var(--danger-color, #e17055);
    --t-warning: var(--warning-color, #fdcb6e);
    --t-info: var(--info-color, #74b9ff);
    
    /* Neutrals */
    --t-white: var(--white, #ffffff);
    --t-gray-100: var(--gray-100, #f1f3f4);
    --t-gray-200: var(--gray-200, #e9ecef);
    --t-gray-300: var(--gray-300, #dee2e6);
    --t-gray-400: var(--gray-400, #ced4da);
    --t-gray-500: var(--gray-500, #adb5bd);
    --t-gray-600: var(--gray-600, #6c757d);
    
    /* Text */
    --t-text-primary: var(--text-primary, #2d3748);
    --t-text-secondary: var(--text-secondary, #4a5568);
    --t-text-muted: var(--text-muted, #718096);
    
    /* Gradients */
    --t-gradient: linear-gradient(135deg, var(--t-primary) 0%, var(--t-primary-light) 100%);
    --t-gradient-dark: linear-gradient(135deg, var(--t-primary-dark) 0%, var(--t-primary) 100%);
    --t-gradient-secondary: linear-gradient(135deg, var(--t-secondary) 0%, #ff8c5a 100%);
    --t-gradient-success: linear-gradient(135deg, var(--t-success) 0%, #00cec9 100%);
    --t-gradient-danger: linear-gradient(135deg, var(--t-danger) 0%, #c0392b 100%);
    --t-gradient-purple: linear-gradient(135deg, #6c5ce7 0%, #a29bfe 100%);
    
    /* Shadows */
    --t-shadow-sm: var(--shadow-sm, 0 2px 4px rgba(0, 0, 0, 0.06));
    --t-shadow-md: var(--shadow-md, 0 4px 12px rgba(0, 0, 0, 0.08));
    --t-shadow-lg: var(--shadow-lg, 0 8px 24px rgba(0, 0, 0, 0.12));
    --t-shadow-primary: 0 4px 20px rgba(var(--t-primary-rgb), 0.35);
    --t-shadow-primary-lg: 0 8px 30px rgba(var(--t-primary-rgb), 0.4);
    
    /* Border Radius */
    --t-radius-sm: var(--radius-sm, 0.25rem);
    --t-radius-md: var(--radius-md, 0.375rem);
    --t-radius-lg: var(--radius-lg, 0.5rem);
    --t-radius-xl: var(--radius-xl, 0.75rem);
    --t-radius-2xl: var(--radius-2xl, 1rem);
    --t-radius-full: var(--radius-full, 9999px);
    
    /* Spacing */
    --t-space-1: 0.25rem;
    --t-space-2: 0.5rem;
    --t-space-3: 0.75rem;
    --t-space-4: 1rem;
    --t-space-5: 1.25rem;
    --t-space-6: 1.5rem;
    --t-space-8: 2rem;
    
    /* Transitions */
    --t-transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
    --t-transition-base: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    --t-transition-slow: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ==========================================================================
   2. REUSABLE COMPONENTS
   ========================================================================== */

/* --------------------------------------------------------------------------
   2.1 Buttons
   -------------------------------------------------------------------------- */

/* Base button styles */
.tool-btn-base {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--t-space-2);
    padding: 0.625rem 1rem;
    border: none;
    border-radius: var(--t-radius-2xl);
    font-size: 0.8125rem;
    font-weight: 600;
    font-family: inherit;
    cursor: pointer;
    text-decoration: none;
    white-space: nowrap;
    transition: all var(--t-transition-base);
    min-height: 44px; /* Accessibility: touch target */
}

.tool-btn-base:focus {
    outline: none;
    box-shadow: 0 0 0 3px rgba(var(--t-primary-rgb), 0.25);
}

.tool-btn-base:active {
    transform: translateY(1px);
}

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

/* Primary Action Button */
.tool-btn-action {
    background: var(--t-gradient);
    color: var(--t-white);
    box-shadow: var(--t-shadow-primary);
}

.tool-btn-action:hover:not(:disabled) {
    background: var(--t-gradient-dark);
    transform: translateY(-2px);
    box-shadow: var(--t-shadow-primary-lg);
    color: var(--t-white);
}

/* Secondary Button */
.tool-btn-secondary {
    background: var(--t-white);
    color: var(--t-text-secondary);
    border: 2px solid var(--t-gray-300);
}

.tool-btn-secondary:hover:not(:disabled) {
    background: var(--t-gray-100);
    border-color: var(--t-gray-400);
    transform: translateY(-1px);
    box-shadow: var(--t-shadow-sm);
}

/* Danger Button */
.tool-btn-danger {
    background: var(--t-gradient-danger);
    color: var(--t-white);
    box-shadow: 0 4px 15px rgba(225, 112, 85, 0.35);
}

.tool-btn-danger:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(225, 112, 85, 0.4);
}

/* Success Button */
.tool-btn-success {
    background: var(--t-gradient-success);
    color: var(--t-white);
    box-shadow: 0 4px 15px rgba(0, 184, 148, 0.35);
}

.tool-btn-success:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 184, 148, 0.4);
}

/* Purple Button */
.tool-btn-purple {
    background: var(--t-gradient-purple);
    color: var(--t-white);
    box-shadow: 0 4px 15px rgba(108, 92, 231, 0.35);
}

.tool-btn-purple:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(108, 92, 231, 0.4);
}

/* File Upload Button */
.tool-btn-upload {
    background: linear-gradient(45deg, #ff6b6b, #ee5a52);
    color: var(--t-white);
    box-shadow: 0 4px 15px rgba(255, 107, 107, 0.35);
}

.tool-btn-upload:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(255, 107, 107, 0.4);
}

/* Icon-only button variant */
.tool-btn-icon {
    width: 44px;
    padding: 0.625rem;
}

/* Smaller button size */
.tool-btn-sm {
    padding: 0.5rem 0.75rem;
    font-size: 0.75rem;
    min-height: 36px;
}

/* Larger button size */
.tool-btn-lg {
    padding: 0.875rem 1.5rem;
    font-size: 1rem;
    min-height: 52px;
}

/* --------------------------------------------------------------------------
   2.2 Inputs
   -------------------------------------------------------------------------- */

.tool-input {
    padding: 0.625rem 0.875rem;
    border: 2px solid var(--t-gray-300);
    border-radius: var(--t-radius-xl);
    font-size: 0.875rem;
    font-family: inherit;
    background: var(--t-white);
    color: var(--t-text-primary);
    transition: border-color var(--t-transition-fast), box-shadow var(--t-transition-fast);
    min-height: 44px;
}

.tool-input:focus {
    outline: none;
    border-color: var(--t-primary-light);
    box-shadow: 0 0 0 3px rgba(var(--t-primary-rgb), 0.15);
}

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

/* Textarea variant */
.tool-textarea {
    resize: vertical;
    min-height: 80px;
}

/* Select input */
.tool-select {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%234a5568' d='M6 9L1 4h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 0.75rem center;
    padding-right: 2.5rem;
}

[dir="rtl"] .tool-select {
    background-position: left 0.75rem center;
    padding-right: 0.875rem;
    padding-left: 2.5rem;
}

/* --------------------------------------------------------------------------
   2.3 Panels & Cards
   -------------------------------------------------------------------------- */

.tool-panel {
    background: var(--t-white);
    border-radius: var(--t-radius-2xl);
    padding: var(--t-space-4);
    box-shadow: var(--t-shadow-md);
    border: 1px solid var(--t-gray-200);
}

.tool-panel-lg {
    padding: var(--t-space-6);
    border-radius: var(--t-radius-2xl);
}

/* Card with gradient top border */
.tool-card {
    background: var(--t-white);
    border-radius: var(--t-radius-xl);
    overflow: hidden;
    box-shadow: var(--t-shadow-lg);
    border: 2px solid var(--t-primary-light);
    border-top: none;
}

.tool-card::before {
    content: '';
    display: block;
    height: 4px;
    background: var(--t-gradient);
}

/* --------------------------------------------------------------------------
   2.4 Headers
   -------------------------------------------------------------------------- */

.tool-header-gradient {
    background: linear-gradient(135deg, #6366f1 0%, var(--t-primary-light) 50%, var(--t-success) 100%);
    padding: 1.25rem 1.5rem;
    text-align: center;
    border-radius: var(--t-radius-2xl) var(--t-radius-2xl) 0 0;
}

.tool-header-gradient h1,
.tool-header-gradient h2 {
    color: var(--t-white);
    margin: 0;
    font-size: 1.5rem;
    font-weight: 700;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.2);
}

/* Simple header bar */
.tool-header-simple {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 1.25rem;
    background: var(--t-gray-100);
    border-bottom: 1px solid var(--t-gray-200);
}

.tool-header-simple h1,
.tool-header-simple h2 {
    margin: 0;
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--t-text-primary);
}

/* --------------------------------------------------------------------------
   2.5 Result/Status Display
   -------------------------------------------------------------------------- */

.tool-result {
    text-align: center;
    margin: var(--t-space-3) 0;
    padding: 0.75rem 1rem;
    background: var(--t-gradient-success);
    color: var(--t-white);
    border-radius: var(--t-radius-lg);
    font-size: 1rem;
    font-weight: 600;
    min-height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--t-shadow-md);
}

.tool-result-neutral {
    background: var(--t-gray-100);
    color: var(--t-text-secondary);
}

.tool-result-error {
    background: var(--t-gradient-danger);
}

/* --------------------------------------------------------------------------
   2.6 Control/Actions Row
   -------------------------------------------------------------------------- */

.tool-controls {
    display: flex;
    gap: var(--t-space-3);
    flex-wrap: wrap;
    justify-content: center;
    align-items: center;
    margin-bottom: var(--t-space-4);
}

.tool-controls-start {
    justify-content: flex-start;
}

.tool-controls-between {
    justify-content: space-between;
}

/* --------------------------------------------------------------------------
   2.7 Grid/List Display
   -------------------------------------------------------------------------- */

.tool-grid {
    display: grid;
    gap: var(--t-space-3);
}

.tool-grid-2 {
    grid-template-columns: repeat(2, 1fr);
}

.tool-grid-3 {
    grid-template-columns: repeat(3, 1fr);
}

.tool-grid-4 {
    grid-template-columns: repeat(4, 1fr);
}

.tool-grid-auto {
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
}

/* --------------------------------------------------------------------------
   2.8 File Upload Wrapper
   -------------------------------------------------------------------------- */

.tool-file-wrapper {
    position: relative;
    overflow: hidden;
    display: inline-block;
}

.tool-file-wrapper input[type="file"] {
    position: absolute;
    left: -9999px;
    opacity: 0;
    width: 0.1px;
    height: 0.1px;
    pointer-events: none;
}

.tool-file-label {
    display: inline-flex;
    align-items: center;
    gap: var(--t-space-2);
    cursor: pointer;
}

/* ==========================================================================
   3. UTILITY CLASSES
   ========================================================================== */

/* Layout */
.t-flex { display: flex; }
.t-flex-col { flex-direction: column; }
.t-flex-center { align-items: center; justify-content: center; }
.t-flex-between { justify-content: space-between; }
.t-flex-wrap { flex-wrap: wrap; }
.t-flex-1 { flex: 1; }
.t-gap-1 { gap: var(--t-space-1); }
.t-gap-2 { gap: var(--t-space-2); }
.t-gap-3 { gap: var(--t-space-3); }
.t-gap-4 { gap: var(--t-space-4); }

/* Spacing */
.t-m-0 { margin: 0; }
.t-mt-2 { margin-top: var(--t-space-2); }
.t-mt-4 { margin-top: var(--t-space-4); }
.t-mb-2 { margin-bottom: var(--t-space-2); }
.t-mb-4 { margin-bottom: var(--t-space-4); }
.t-p-2 { padding: var(--t-space-2); }
.t-p-3 { padding: var(--t-space-3); }
.t-p-4 { padding: var(--t-space-4); }

/* Text */
.t-text-center { text-align: center; }
.t-text-start { text-align: start; }
.t-text-sm { font-size: 0.875rem; }
.t-text-lg { font-size: 1.125rem; }
.t-text-bold { font-weight: 600; }
.t-text-primary { color: var(--t-text-primary); }
.t-text-secondary { color: var(--t-text-secondary); }
.t-text-muted { color: var(--t-text-muted); }
.t-text-white { color: var(--t-white); }

/* Background */
.t-bg-white { background-color: var(--t-white); }
.t-bg-gray { background-color: var(--t-gray-100); }
.t-bg-gradient { background: var(--t-gradient); }

/* Border Radius */
.t-rounded { border-radius: var(--t-radius-lg); }
.t-rounded-xl { border-radius: var(--t-radius-xl); }
.t-rounded-2xl { border-radius: var(--t-radius-2xl); }
.t-rounded-full { border-radius: var(--t-radius-full); }

/* Shadows */
.t-shadow { box-shadow: var(--t-shadow-md); }
.t-shadow-lg { box-shadow: var(--t-shadow-lg); }

/* Width/Height */
.t-w-full { width: 100%; }
.t-h-full { height: 100%; }
.t-min-h-0 { min-height: 0; }

/* ==========================================================================
   4. SHARED ANIMATIONS
   ========================================================================== */

/* Fade In */
@keyframes t-fade-in {
    from { opacity: 0; }
    to { opacity: 1; }
}

.t-animate-fade-in {
    animation: t-fade-in var(--t-transition-base) ease-out forwards;
}

/* Fade In Up */
@keyframes t-fade-in-up {
    from { 
        opacity: 0; 
        transform: translateY(10px); 
    }
    to { 
        opacity: 1; 
        transform: translateY(0); 
    }
}

.t-animate-fade-in-up {
    animation: t-fade-in-up var(--t-transition-base) ease-out forwards;
}

/* Pop In (scale) */
@keyframes t-pop-in {
    0% { 
        opacity: 0; 
        transform: scale(0.8); 
    }
    70% { 
        transform: scale(1.05); 
    }
    100% { 
        opacity: 1; 
        transform: scale(1); 
    }
}

.t-animate-pop-in {
    animation: t-pop-in 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275) forwards;
}

/* Shake (for errors) */
@keyframes t-shake {
    0%, 100% { transform: translateX(0); }
    10%, 30%, 50%, 70%, 90% { transform: translateX(-5px); }
    20%, 40%, 60%, 80% { transform: translateX(5px); }
}

.t-animate-shake {
    animation: t-shake 0.5s ease-in-out;
}

/* Pulse */
@keyframes t-pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.t-animate-pulse {
    animation: t-pulse 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
}

/* Spin */
@keyframes t-spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.t-animate-spin {
    animation: t-spin 1s linear infinite;
}

/* Bounce */
@keyframes t-bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

.t-animate-bounce {
    animation: t-bounce 1s ease-in-out infinite;
}

/* ==========================================================================
   5. RESPONSIVE ADJUSTMENTS
   ========================================================================== */

@media (max-width: 768px) {
    .tool-btn-base {
        padding: 0.5rem 0.75rem;
        font-size: 0.75rem;
        min-height: 40px;
    }
    
    .tool-btn-lg {
        padding: 0.75rem 1.25rem;
        font-size: 0.875rem;
        min-height: 44px;
    }
    
    .tool-input {
        font-size: 16px; /* Prevent zoom on iOS */
    }
    
    .tool-header-gradient h1,
    .tool-header-gradient h2 {
        font-size: 1.25rem;
    }
    
    .tool-controls {
        gap: var(--t-space-2);
    }
    
    .tool-grid-2,
    .tool-grid-3,
    .tool-grid-4 {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 480px) {
    .tool-panel,
    .tool-panel-lg {
        padding: var(--t-space-3);
    }
    
    .tool-grid-2,
    .tool-grid-3,
    .tool-grid-4 {
        grid-template-columns: 1fr;
    }
    
    /* Hide button text on very small screens */
    .tool-btn-responsive span:not(.t-sr-only) {
        display: none;
    }
}

/* ==========================================================================
   6. FULLSCREEN MODE ADJUSTMENTS
   ========================================================================== */

.tool-page-wrapper:fullscreen .tool-header-gradient,
.tool-page-wrapper:-webkit-full-screen .tool-header-gradient,
.tool-page-wrapper:-moz-full-screen .tool-header-gradient {
    padding: 1rem 1.25rem;
}

.tool-page-wrapper:fullscreen .tool-header-gradient h1,
.tool-page-wrapper:-webkit-full-screen .tool-header-gradient h1,
.tool-page-wrapper:-moz-full-screen .tool-header-gradient h1 {
    font-size: 1.35rem;
}

.tool-page-wrapper:fullscreen .tool-controls,
.tool-page-wrapper:-webkit-full-screen .tool-controls,
.tool-page-wrapper:-moz-full-screen .tool-controls {
    margin-bottom: var(--t-space-3);
    gap: var(--t-space-2);
}

/* ==========================================================================
   7. REDUCED MOTION
   ========================================================================== */

@media (prefers-reduced-motion: reduce) {
    .tool-btn-base,
    .tool-btn-action,
    .tool-btn-secondary,
    .tool-btn-danger,
    .tool-btn-success {
        transition: none;
    }
    
    .tool-btn-base:hover,
    .tool-btn-action:hover,
    .tool-btn-secondary:hover {
        transform: none;
    }
    
    .t-animate-fade-in,
    .t-animate-fade-in-up,
    .t-animate-pop-in,
    .t-animate-shake,
    .t-animate-pulse,
    .t-animate-spin,
    .t-animate-bounce {
        animation: none;
        opacity: 1;
        transform: none;
    }
}

/* ==========================================================================
   8. RTL SUPPORT
   ========================================================================== */

[dir="rtl"] .tool-controls-start {
    justify-content: flex-end;
}

[dir="rtl"] .t-text-start {
    text-align: right;
}