/* Global Styling Variables */
:root {
    --bg-darkest: #0B0E14;
    --bg-sidebar: #11151F;
    --bg-card: #181E2C;
    --bg-input: #1F2739;
    
    --accent-purple: #9D4EDD;
    --accent-purple-glow: rgba(157, 78, 221, 0.4);
    --accent-teal: #00F5D4;
    --accent-teal-glow: rgba(0, 245, 212, 0.4);
    --accent-orange: #FF9F1C;
    --accent-orange-glow: rgba(255, 159, 28, 0.4);
    --accent-red: #E63946;
    
    --text-main: #F1F3F5;
    --text-muted: #A3B1C6;
    --text-dark: #495057;
    
    --border-color: #242E42;
    --transition-speed: 0.3s;
}

/* Reset and Global Settings */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', sans-serif;
}

body {
    background-color: var(--bg-darkest);
    color: var(--text-main);
    overflow-x: hidden;
    height: 100vh;
}

/* Main Layout Grid */
.app-container {
    display: grid;
    grid-template-columns: 260px 1fr;
    height: 100vh;
    width: 100vw;
}

/* Sidebar Navigation */
.sidebar {
    background-color: var(--bg-sidebar);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    padding: 24px 16px;
    height: 100%;
}

.logo-area {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 40px;
    padding-left: 8px;
}

.logo-icon {
    font-size: 24px;
    color: var(--accent-teal);
    text-shadow: 0 0 10px var(--accent-teal-glow);
}

.logo-text {
    font-family: 'Outfit', sans-serif;
    font-size: 22px;
    font-weight: 700;
    letter-spacing: 0.5px;
}

.logo-text span {
    color: var(--accent-purple);
}

.nav-menu {
    display: flex;
    flex-direction: column;
    gap: 8px;
    flex-grow: 1;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 14px 16px;
    border-radius: 12px;
    text-decoration: none;
    color: var(--text-muted);
    font-weight: 500;
    transition: all var(--transition-speed);
}

.nav-item i {
    font-size: 18px;
    transition: transform var(--transition-speed);
}

.nav-item:hover {
    color: var(--text-main);
    background-color: rgba(255, 255, 255, 0.03);
}

.nav-item:hover i {
    transform: translateX(4px);
}

.nav-item.active {
    color: #FFF;
    background-color: var(--accent-purple);
    box-shadow: 0 4px 15px var(--accent-purple-glow);
}

.nav-item.active i {
    color: var(--accent-teal);
}

.user-profile-summary {
    display: flex;
    align-items: center;
    gap: 12px;
    padding-top: 16px;
    border-top: 1px solid var(--border-color);
}

.user-avatar {
    width: 44px;
    height: 44px;
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.user-avatar i {
    font-size: 20px;
    color: var(--accent-teal);
}

.user-name {
    font-weight: 600;
    font-size: 14px;
}

.user-status {
    font-size: 12px;
    color: var(--accent-teal);
    display: flex;
    align-items: center;
    gap: 4px;
}

.user-status::before {
    content: '';
    display: inline-block;
    width: 6px;
    height: 6px;
    background-color: var(--accent-teal);
    border-radius: 50%;
    box-shadow: 0 0 8px var(--accent-teal);
}

/* Main Content Area */
.main-content {
    display: flex;
    flex-direction: column;
    height: 100%;
    overflow-y: auto;
}

/* Top Header & XP Bar */
.top-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 24px 40px;
    background-color: rgba(11, 14, 20, 0.8);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 10;
}

.page-title {
    font-family: 'Outfit', sans-serif;
    font-size: 28px;
    font-weight: 700;
}

/* XP Progress Bar */
.xp-progress-container {
    display: flex;
    align-items: center;
    gap: 16px;
    background-color: var(--bg-sidebar);
    padding: 8px 16px;
    border-radius: 30px;
    border: 1px solid var(--border-color);
}

.xp-level-badge {
    background-color: var(--accent-orange);
    color: #FFF;
    padding: 4px 12px;
    border-radius: 15px;
    font-weight: 700;
    font-size: 13px;
    font-family: 'Outfit', sans-serif;
    box-shadow: 0 0 10px var(--accent-orange-glow);
}

.xp-bar-outer {
    width: 140px;
    height: 12px;
    background-color: var(--bg-darkest);
    border-radius: 6px;
    overflow: hidden;
}

.xp-bar-inner {
    height: 100%;
    width: 0;
    background: linear-gradient(90deg, var(--accent-purple), var(--accent-teal));
    border-radius: 6px;
    transition: width 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.xp-text {
    font-size: 13px;
    font-weight: 600;
    color: var(--text-muted);
}

/* Sections Viewport */
.sections-container {
    padding: 40px;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

.content-section {
    display: none;
    animation: fadeIn 0.4s ease;
    flex-direction: column;
    gap: 32px;
    height: 100%;
}

.content-section.active {
    display: flex;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Welcome Banner */
.welcome-banner {
    background: linear-gradient(135deg, var(--accent-purple), #5B21B6);
    border-radius: 20px;
    padding: 32px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: relative;
    overflow: hidden;
    box-shadow: 0 8px 30px rgba(157, 78, 221, 0.2);
}

.banner-text h2 {
    font-family: 'Outfit', sans-serif;
    font-size: 26px;
    margin-bottom: 12px;
}

.banner-text p {
    color: rgba(255, 255, 255, 0.85);
    font-size: 15px;
    max-width: 500px;
}

.banner-img i {
    font-size: 80px;
    color: rgba(255, 255, 255, 0.15);
    transform: rotate(45deg);
    position: absolute;
    right: 40px;
    bottom: -10px;
}

/* Dashboard Cards Grid */
.dashboard-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 32px;
}

.dash-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    padding: 24px;
}

.dash-card h3 {
    font-family: 'Outfit', sans-serif;
    font-size: 20px;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 12px;
}

.icon-orange { color: var(--accent-orange); }
.icon-purple { color: var(--accent-purple); }

/* Missions List */
.missions-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.mission-item {
    display: flex;
    align-items: center;
    background-color: var(--bg-sidebar);
    padding: 16px;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    transition: transform var(--transition-speed);
}

.mission-icon {
    font-size: 20px;
    color: var(--accent-teal);
    margin-right: 16px;
}

.mission-desc {
    font-size: 14px;
    font-weight: 500;
    flex-grow: 1;
}

.mission-xp {
    background-color: rgba(0, 245, 212, 0.15);
    color: var(--accent-teal);
    padding: 4px 8px;
    border-radius: 8px;
    font-size: 12px;
    font-weight: 700;
}

.mission-item.completed {
    opacity: 0.6;
}

.mission-item.completed .mission-icon {
    content: "\f058"; /* check-circle */
    font-family: 'Font Awesome 6 Free';
    font-weight: 900;
}

/* Conquistas (Badges) */
.conquistas-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
    text-align: center;
}

.conquista-badge {
    background-color: var(--bg-sidebar);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 20px 8px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    transition: all var(--transition-speed);
}

.conquista-badge i {
    font-size: 32px;
    color: var(--accent-orange);
}

.conquista-badge span {
    font-size: 12px;
    font-weight: 600;
}

.conquista-badge.locked {
    filter: grayscale(1);
    opacity: 0.3;
}

/* Math Lab Styles */
.mathlab-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    align-items: center;
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    padding: 40px;
}

.fraction-controls {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.control-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.control-group label {
    font-size: 15px;
    font-weight: 600;
}

/* Stylized Range Input */
input[type="range"] {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 8px;
    border-radius: 4px;
    background: var(--bg-input);
    outline: none;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 22px;
    height: 22px;
    border-radius: 50%;
    background-color: var(--accent-teal);
    cursor: pointer;
    box-shadow: 0 0 8px var(--accent-teal-glow);
    transition: transform 0.1s;
}

input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.1);
}

.fraction-display-math {
    display: flex;
    flex-direction: column;
    align-items: center;
    margin-top: 16px;
}

.display-num, .display-den {
    font-family: 'Outfit', sans-serif;
    font-size: 40px;
    font-weight: 800;
}

.display-num { color: var(--accent-teal); }
.display-den { color: var(--text-main); }

.fraction-line {
    width: 60px;
    border: 3px solid var(--text-main);
    border-radius: 3px;
    margin: 4px 0;
}

.fraction-viz {
    display: flex;
    justify-content: center;
    align-items: center;
}

.pizza-base-circle {
    fill: var(--bg-input);
    stroke: var(--border-color);
    stroke-width: 3;
}

.pizza-slice-path {
    fill: var(--accent-teal);
    fill-opacity: 0.85;
    stroke: var(--bg-card);
    stroke-width: 2;
    transition: d 0.3s ease;
}

.pizza-slice-line {
    stroke: var(--border-color);
    stroke-width: 2;
}

/* Quiz Arena */
.quiz-subjects-select {
    text-align: center;
}

.quiz-subjects-select h2 {
    font-family: 'Outfit', sans-serif;
    margin-bottom: 24px;
}

.subjects-grid {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 24px;
}

.subject-btn {
    background-color: var(--bg-card);
    border: 2px solid var(--border-color);
    border-radius: 16px;
    padding: 24px 32px;
    color: var(--text-main);
    font-family: 'Outfit', sans-serif;
    font-size: 18px;
    font-weight: 700;
    cursor: pointer;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    transition: all var(--transition-speed);
}

.subject-btn i {
    font-size: 32px;
    transition: transform var(--transition-speed);
}

.subject-btn:hover {
    border-color: var(--accent-purple);
    box-shadow: 0 8px 25px var(--accent-purple-glow);
    transform: translateY(-4px);
}

.subject-btn:hover i {
    transform: scale(1.15);
}

.quiz-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    padding: 32px;
    max-width: 600px;
    margin: 0 auto;
    box-shadow: 0 10px 30px rgba(0,0,0,0.3);
    animation: scaleIn 0.3s ease;
}

@keyframes scaleIn {
    from { transform: scale(0.95); opacity: 0; }
    to { transform: scale(1); opacity: 1; }
}

.quiz-header {
    display: flex;
    justify-content: space-between;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 16px;
    margin-bottom: 24px;
    font-size: 14px;
    font-weight: 600;
    color: var(--text-muted);
}

.quiz-subj-title {
    color: var(--accent-teal);
    font-family: 'Outfit', sans-serif;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.quiz-body h3 {
    font-family: 'Outfit', sans-serif;
    font-size: 22px;
    margin-bottom: 24px;
}

.options-container {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.option-btn {
    background-color: var(--bg-sidebar);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 16px;
    color: var(--text-main);
    text-align: left;
    font-size: 15px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
}

.option-btn:hover:not(:disabled) {
    background-color: var(--bg-input);
    border-color: var(--text-muted);
}

.option-btn.correct {
    background-color: rgba(0, 245, 212, 0.15);
    border-color: var(--accent-teal);
    color: var(--accent-teal);
    font-weight: 700;
}

.option-btn.wrong {
    background-color: rgba(230, 57, 70, 0.15);
    border-color: var(--accent-red);
    color: var(--accent-red);
    font-weight: 700;
}

.quiz-footer {
    display: flex;
    justify-content: flex-end;
    margin-top: 24px;
}

.quiz-action-btn {
    background-color: var(--accent-purple);
    border: none;
    border-radius: 12px;
    padding: 12px 24px;
    color: #FFF;
    font-weight: 700;
    cursor: pointer;
    box-shadow: 0 4px 15px var(--accent-purple-glow);
    display: flex;
    align-items: center;
    gap: 8px;
    transition: all 0.2s;
}

.quiz-action-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px var(--accent-purple-glow);
}

.hidden {
    display: none !important;
}

/* Tutor Chat Wrapper */
.chat-wrapper {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    display: flex;
    flex-direction: column;
    height: 480px;
    max-width: 700px;
    margin: 0 auto;
    overflow: hidden;
}

.chat-messages {
    flex-grow: 1;
    padding: 24px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.message {
    max-width: 80%;
    padding: 14px 18px;
    border-radius: 16px;
    font-size: 14px;
    line-height: 1.5;
}

.tutor-msg {
    align-self: flex-start;
    background-color: var(--bg-sidebar);
    border-bottom-left-radius: 4px;
    border: 1px solid var(--border-color);
}

.user-msg {
    align-self: flex-end;
    background-color: var(--accent-purple);
    color: #FFF;
    border-bottom-right-radius: 4px;
}

.chat-input-area {
    display: flex;
    gap: 12px;
    padding: 16px 24px;
    background-color: var(--bg-sidebar);
    border-top: 1px solid var(--border-color);
}

.chat-input-area input {
    flex-grow: 1;
    background-color: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 14px 16px;
    color: var(--text-main);
    outline: none;
    font-size: 14px;
    transition: border-color 0.2s;
}

.chat-input-area input:focus {
    border-color: var(--accent-purple);
}

.chat-input-area button {
    background-color: var(--accent-teal);
    border: none;
    border-radius: 12px;
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    font-size: 16px;
    color: var(--bg-darkest);
    transition: all 0.2s;
}

.chat-input-area button:hover {
    transform: scale(1.05);
    box-shadow: 0 0 10px var(--accent-teal-glow);
}

/* 3D Flipping Flashcards */
.flashcards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 24px;
}

.flashcard-container {
    perspective: 1000px;
    height: 200px;
}

.flashcard {
    width: 100%;
    height: 100%;
    position: relative;
    transform-style: preserve-3d;
    transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
    cursor: pointer;
}

.flashcard.flipped {
    transform: rotateY(180deg);
}

.card-face {
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    border-radius: 20px;
    border: 1px solid var(--border-color);
    padding: 24px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.card-front {
    background-color: var(--bg-card);
}

.card-back {
    background-color: var(--bg-sidebar);
    transform: rotateY(180deg);
    justify-content: center;
    align-items: center;
    text-align: center;
}

.card-back p {
    font-size: 15px;
    line-height: 1.6;
}

.card-tag {
    align-self: flex-start;
    background-color: rgba(157, 78, 221, 0.15);
    color: var(--accent-purple);
    font-size: 11px;
    font-weight: 700;
    padding: 4px 8px;
    border-radius: 6px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.card-prompt {
    font-family: 'Outfit', sans-serif;
    font-size: 18px;
    font-weight: 700;
    line-height: 1.4;
    margin: 16px 0;
}

.click-hint {
    font-size: 12px;
    color: var(--text-muted);
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 6px;
}

/* Custom Scrollbar for modern feel */
::-webkit-scrollbar {
    width: 10px;
}

::-webkit-scrollbar-track {
    background: var(--bg-darkest);
}

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-dark);
}

/* Responsiveness Settings */
@media (max-width: 900px) {
    .app-container {
        grid-template-columns: 1fr;
    }
    
    .sidebar {
        display: none; /* Can implement burger menu if needed */
    }
    
    .top-header {
        padding: 20px;
    }
    
    .sections-container {
        padding: 20px;
    }
    
    .dashboard-grid, .mathlab-container {
        grid-template-columns: 1fr;
    }
}

/* Level Up Pop-up Alert */
.level-up-alert {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background-color: rgba(11, 14, 20, 0.9);
    backdrop-filter: blur(8px);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    animation: fadeIn 0.3s ease;
}

.alert-content {
    background-color: var(--bg-card);
    border: 2px solid var(--accent-orange);
    border-radius: 24px;
    padding: 40px;
    text-align: center;
    max-width: 400px;
    box-shadow: 0 10px 30px var(--accent-orange-glow);
    animation: scaleIn 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.alert-icon {
    font-size: 60px;
    color: var(--accent-orange);
    margin-bottom: 20px;
    text-shadow: 0 0 15px var(--accent-orange-glow);
}

.alert-content h2 {
    font-family: 'Outfit', sans-serif;
    font-size: 32px;
    margin-bottom: 12px;
    color: #FFF;
}

.alert-content p {
    color: var(--text-muted);
    font-size: 16px;
    margin-bottom: 24px;
}

.alert-content button {
    background-color: var(--accent-orange);
    border: none;
    border-radius: 12px;
    padding: 12px 32px;
    color: #FFF;
    font-weight: 700;
    cursor: pointer;
    box-shadow: 0 4px 15px var(--accent-orange-glow);
    transition: all 0.2s;
}

.alert-content button:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px var(--accent-orange-glow);
}

/* Quiz Explanation Cards */
.quiz-explanation {
    margin-top: 16px;
    padding: 16px;
    border-radius: 12px;
    font-size: 14px;
    line-height: 1.6;
    animation: fadeIn 0.3s ease;
}

.quiz-explanation.success {
    background-color: rgba(0, 245, 212, 0.1);
    border: 1px solid var(--accent-teal);
    color: var(--accent-teal);
}

.quiz-explanation.error {
    background-color: rgba(230, 57, 70, 0.1);
    border: 1px solid var(--accent-red);
    color: var(--accent-red);
}

/* Name Modal Styles */
.name-modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background-color: var(--bg-darkest);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 2000;
}

.name-modal-content {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 24px;
    padding: 40px;
    width: 90%;
    max-width: 500px;
    text-align: center;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.5);
    animation: scaleIn 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.name-modal-icon {
    font-size: 50px;
    color: var(--accent-teal);
    margin-bottom: 20px;
    text-shadow: 0 0 15px var(--accent-teal-glow);
}

.name-modal-content h2 {
    font-family: 'Outfit', sans-serif;
    font-size: 26px;
    margin-bottom: 12px;
}

.name-modal-content p {
    color: var(--text-muted);
    font-size: 15px;
    line-height: 1.5;
    margin-bottom: 24px;
}

.name-modal-content input {
    width: 100%;
    background-color: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 14px 16px;
    color: var(--text-main);
    font-size: 16px;
    outline: none;
    text-align: center;
    margin-bottom: 24px;
    transition: border-color 0.2s;
}

.name-modal-content input:focus {
    border-color: var(--accent-teal);
}

.name-modal-content button {
    width: 100%;
    background-color: var(--accent-teal);
    border: none;
    border-radius: 12px;
    padding: 14px;
    color: var(--bg-darkest);
    font-weight: 700;
    font-size: 16px;
    cursor: pointer;
    transition: all 0.2s;
}

.name-modal-content button:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 15px var(--accent-teal-glow);
}