/* ============================================
   ÁLGEBRA LAB - Main Styles
   ============================================ */

:root {
    --color-primary: #1e3a5f;
    --color-primary-light: #2d5a8a;
    --color-primary-dark: #152a45;
    --color-secondary: #14b8a6;
    --color-secondary-light: #2dd4bf;
    --color-secondary-dark: #0d9488;
    --color-accent: #f97316;
    --color-accent-light: #fb923c;
    --color-background: #faf5f0;
    --color-surface: #ffffff;
    --color-border: #e5e7eb;
    --color-border-light: #f3f4f6;
    --color-text-primary: #1f2937;
    --color-text-secondary: #6b7280;
    --color-text-muted: #9ca3af;
    --color-text-inverse: #ffffff;
    --color-success: #10b981;
    --color-success-light: #d1fae5;
    --color-error: #ef4444;
    --color-error-light: #fee2e2;
    --color-warning: #f59e0b;
    --color-info: #3b82f6;
    --gradient-primary: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
    --gradient-secondary: linear-gradient(135deg, var(--color-secondary) 0%, var(--color-secondary-light) 100%);
    --font-primary: 'Outfit', sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-full: 9999px;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.1);
    --transition-fast: 150ms ease;
    --transition-normal: 300ms ease;
    --transition-slow: 500ms ease;
    --header-height: 64px;
    --sidebar-width: 320px;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    background: var(--color-background);
    color: var(--color-text-primary);
    line-height: 1.5;
    min-height: 100vh;
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

button:disabled {
    cursor: not-allowed;
    opacity: 0.5;
}

ul {
    list-style: none;
}

a {
    text-decoration: none;
    color: inherit;
}

.hidden {
    display: none !important;
}

/* Loading Screen */
.loading-screen {
    position: fixed;
    inset: 0;
    background: var(--gradient-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    transition: opacity 0.5s, visibility 0.5s;
}

.loading-screen.fade-out {
    opacity: 0;
    visibility: hidden;
}

.loading-content {
    text-align: center;
    color: white;
}

.loading-logo {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 2rem;
}

.logo-lab {
    color: var(--color-secondary-light);
    margin-left: 0.5rem;
    padding: 0.25rem 0.75rem;
    background: rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-md);
}

.loading-bar {
    width: 200px;
    height: 6px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-full);
    margin: 0 auto 1rem;
    overflow: hidden;
}

.loading-progress {
    width: 0%;
    height: 100%;
    background: var(--color-secondary-light);
    border-radius: var(--radius-full);
    animation: loadProgress 2s forwards;
}

@keyframes loadProgress {
    to {
        width: 100%;
    }
}

.loading-text {
    font-size: 0.875rem;
    opacity: 0.8;
}

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

/* Header */
.main-header {
    position: sticky;
    top: 0;
    height: var(--header-height);
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 1.5rem;
    z-index: 200;
    box-shadow: var(--shadow-sm);
}

.header-left,
.header-right {
    display: flex;
    align-items: center;
    gap: 1rem;
}

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

.menu-toggle {
    width: 40px;
    height: 40px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    padding: 0.5rem;
    border-radius: var(--radius-md);
}

.menu-toggle:hover {
    background: var(--color-border-light);
}

.menu-toggle span {
    display: block;
    width: 20px;
    height: 2px;
    background: var(--color-text-primary);
    border-radius: 2px;
    transition: var(--transition-fast);
}

.app-title {
    font-size: 1.25rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.title-algebra {
    color: var(--color-primary);
}

.title-lab {
    font-size: 0.75rem;
    font-weight: 600;
    padding: 0.25rem 0.5rem;
    background: var(--color-secondary-light);
    color: var(--color-primary-dark);
    border-radius: var(--radius-sm);
}

.module-indicator {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: var(--color-border-light);
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    font-weight: 500;
}

.progress-mini {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.progress-mini-bar {
    width: 60px;
    height: 6px;
    background: var(--color-border);
    border-radius: var(--radius-full);
    overflow: hidden;
}

.progress-mini-fill {
    height: 100%;
    background: var(--gradient-secondary);
    transition: width var(--transition-normal);
}

.progress-mini-text {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--color-text-secondary);
}

.btn-icon {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    color: var(--color-text-secondary);
}

.btn-icon:hover {
    background: var(--color-border-light);
    color: var(--color-primary);
}

/* Sidebar */
.sidebar {
    position: fixed;
    top: var(--header-height);
    left: 0;
    width: var(--sidebar-width);
    height: calc(100vh - var(--header-height));
    background: var(--color-surface);
    border-right: 1px solid var(--color-border);
    transform: translateX(-100%);
    transition: transform var(--transition-normal);
    z-index: 300;
    display: flex;
    flex-direction: column;
}

.sidebar.open {
    transform: translateX(0);
}

.sidebar-overlay {
    position: fixed;
    top: var(--header-height);
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    opacity: 0;
    visibility: hidden;
    transition: var(--transition-normal);
    z-index: 299;
}

.sidebar-overlay.visible {
    opacity: 1;
    visibility: visible;
}

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

.sidebar-header h2 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--color-primary);
}

.sidebar-close {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: var(--color-text-secondary);
    border-radius: var(--radius-md);
}

.sidebar-close:hover {
    background: var(--color-border-light);
}

.module-nav {
    flex: 1;
    overflow-y: auto;
    padding: 1.5rem 1rem;
}

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

.sidebar-module {
    display: flex;
    align-items: center;
    padding: 0.875rem 1.25rem;
    border-radius: var(--radius-full);
    font-size: 0.9375rem;
    font-weight: 500;
    transition: all var(--transition-fast);
    border: 1px solid transparent;
    color: var(--color-text-primary);
}

.sidebar-module:hover:not(.locked) {
    background: var(--color-border-light);
    color: var(--color-primary);
    transform: translateX(4px);
}

.sidebar-module.active {
    background: var(--color-primary);
    color: white !important;
    box-shadow: var(--shadow-md);
}

.sidebar-module.completed {
    background: var(--color-success-light);
    color: var(--color-success-dark);
}

.sidebar-module.locked {
    opacity: 0.5;
    cursor: not-allowed;
}

.sidebar-module.locked:hover {
    transform: none;
}

.sidebar-footer {
    padding: 1.5rem;
    border-top: 1px solid var(--color-border);
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.sidebar-footer .btn {
    width: 100%;
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    padding: 0.625rem 1rem;
    margin: 0 !important;
}

#btn-reset {
    margin-top: 0.5rem !important;
}


/* Main Content */
.main-content {
    flex: 1;
    padding: 1.5rem;
}

.screen {
    display: none;
    animation: fadeIn var(--transition-normal);
}

.screen.active {
    display: block;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

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

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
    font-weight: 600;
    border-radius: var(--radius-lg);
    transition: var(--transition-fast);
}

.btn-primary {
    background: var(--gradient-primary);
    color: white;
    box-shadow: var(--shadow-md);
}

.btn-primary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background: var(--color-surface);
    color: var(--color-primary);
    border: 2px solid var(--color-primary);
}

.btn-secondary:hover:not(:disabled) {
    background: var(--color-primary);
    color: white;
}

.btn-large {
    padding: 1rem 2rem;
    font-size: 1.125rem;
    border-radius: var(--radius-xl);
}

.btn-nav {
    padding: 0.75rem 1.25rem;
    background: var(--color-surface);
    border: 2px solid var(--color-border);
}

.btn-nav:hover:not(:disabled) {
    border-color: var(--color-primary);
    color: var(--color-primary);
}

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

.btn-next:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

/* Toast */
.feedback-toast {
    position: fixed;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1rem 1.5rem;
    background: var(--color-surface);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    z-index: 800;
    transition: transform 0.5s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

.feedback-toast.visible {
    transform: translateX(-50%) translateY(0);
}

.feedback-toast.success {
    border-left: 4px solid var(--color-success);
}

.feedback-toast.error {
    border-left: 4px solid var(--color-error);
}

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

.toast-message {
    font-weight: 500;
}

/* Modal */
.modal {
    position: fixed;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0, 0, 0, 0.5);
    z-index: 500;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition-normal);
}

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

.modal-content {
    background: var(--color-surface);
    border-radius: var(--radius-2xl);
    padding: 2rem;
    max-width: 500px;
    width: 90%;
    position: relative;
    transform: scale(0.9);
    transition: transform 0.5s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

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

.modal-close {
    position: absolute;
    top: 1rem;
    right: 1rem;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: var(--color-text-muted);
    border-radius: var(--radius-full);
}

.hint-content {
    text-align: center;
}

.hint-icon {
    font-size: 48px;
    margin-bottom: 1rem;
}

.hint-title {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: 1rem;
}

.hint-text {
    color: var(--color-text-secondary);
    line-height: 1.75;
    margin-bottom: 1.5rem;
}

.math-expression {
    font-family: var(--font-mono);
    font-size: 1.25rem;
    color: var(--color-primary);
    background: var(--color-border-light);
    padding: 0.5rem 1rem;
    border-radius: var(--radius-md);
    display: inline-block;
}

sup {
    font-size: 0.7em;
    vertical-align: super;
}