:root {
    /* Color palette - Modern, appealing colors */
    --primary-color: #3A86FF;
    --primary-light: #639FFF;  
    --primary-dark: #2866CC;
    --secondary-color: #6C5DD3;
    --accent-color: #00D2FF;
    --success-color: #48DA89;
    --error-color: #FF5A65;
    --warning-color: #FFBE0B;
    
    /* Neutral colors */
    --bg-color: #F6F8FC;
    --card-bg: rgba(255, 255, 255, 0.9);
    --text-color: #1B2559;
    --text-secondary: #697489;
    --border-color: rgba(203, 213, 225, 0.5);
    
    /* Dark mode colors */
    --dark-bg-color: #0B101E;
    --dark-card-bg: rgba(30, 38, 64, 0.95);
    --dark-text-color: #E9EFFD;
    --dark-text-secondary: #A0A8C2;
    --dark-border-color: rgba(78, 89, 119, 0.5);
    
    /* Effects */
    --shadow-color: rgba(16, 24, 40, 0.08);
    --shadow-strong: rgba(16, 24, 40, 0.16);
    --glassmorphism: rgba(255, 255, 255, 0.4);
    --glassmorphism-dark: rgba(30, 38, 64, 0.75);
    
    /* High contrast mode */
    --contrast-bg-color: #000000;
    --contrast-text-color: #FFFFFF;
    --contrast-primary: #FFFF00;

    /* Spacing */
    --space-xs: 0.25rem;
    --space-s: 0.5rem;
    --space-m: 1rem;
    --space-l: 1.5rem;
    --space-xl: 2rem;
    --space-xxl: 3rem;
    
    /* Border radius */
    --radius-s: 8px;
    --radius-m: 12px;
    --radius-l: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;
    
    /* Animation durations */
    --transition-fast: 0.2s;
    --transition-medium: 0.3s;
    --transition-slow: 0.5s;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Manrope', sans-serif;
    font-weight: 400;
    scroll-behavior: smooth;
}

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    line-height: 1.6;
    transition: background-color var(--transition-medium), color var(--transition-medium);
    overflow-x: auto;
}

body.dark-mode {
    background-color: var(--dark-bg-color);
    color: var(--dark-text-color);
}

body.dark-mode .card,
body.dark-mode .lesson-content,
body.dark-mode .quiz-container,
body.dark-mode .daily-goal-container,
body.dark-mode .progress-dashboard,
body.dark-mode .profile-container,
body.dark-mode .activity-stats,
body.dark-mode .profile-card,
body.dark-mode .modal-content,
body.dark-mode .lesson-card,
body.dark-mode .achievement-card,
body.dark-mode .badge-card,
body.dark-mode .leaderboard-item,
body.dark-mode header,
body.dark-mode footer,
body.dark-mode .nav-menu {
    background: var(--dark-card-bg);
    border-color: var(--dark-border-color);
    color: var(--dark-text-color);
}

body.dark-mode .text-secondary {
    color: var(--dark-text-secondary);
}

body.high-contrast {
    background-color: var(--contrast-bg-color);
    color: var(--contrast-text-color);
}

body.high-contrast .btn,
body.high-contrast .nav-link,
body.high-contrast .progress-circle-fill {
    background: var(--contrast-primary);
    stroke: var(--contrast-primary);
    color: var(--contrast-bg-color);
}

/* Background Effects */
.background {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -2;
    overflow: hidden;
}

.gradient-sphere {
    position: absolute;
    border-radius: 50%;
    filter: blur(70px);
}

.gradient-sphere-1 {
    background: linear-gradient(135deg, rgba(58, 134, 255, 0.5), rgba(0, 210, 255, 0.3));
    width: 60vw;
    height: 60vw;
    top: -20vw;
    right: -20vw;
    animation: float 20s ease-in-out infinite alternate;
}

.gradient-sphere-2 {
    background: linear-gradient(225deg, rgba(108, 93, 211, 0.4), rgba(255, 190, 11, 0.2));
    width: 40vw;
    height: 40vw;
    bottom: -10vw;
    left: -10vw;
    animation: float 16s ease-in-out infinite alternate-reverse;
}

.gradient-sphere-3 {
    background: radial-gradient(circle, rgba(72, 218, 137, 0.4), rgba(58, 134, 255, 0.1));
    width: 35vw;
    height: 35vw;
    bottom: 20%;
    right: 15%;
    animation: float 24s ease-in-out infinite alternate;
}

@keyframes float {
    0% { transform: translate(0, 0) rotate(0deg); }
    50% { transform: translate(3%, 2%) rotate(2deg); }
    100% { transform: translate(-2%, 4%) rotate(-1deg); }
}

.noise-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.65' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)' opacity='0.05'/%3E%3C/svg%3E");
    opacity: 0.4;
    z-index: -1;
}

.overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 999;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-medium);
    backdrop-filter: blur(5px);
}

.overlay.active {
    opacity: 1;
    pointer-events: auto;
}

.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--primary-color);
    color: #fff;
    padding: 0.5rem 1rem;
    z-index: 1000;
    transition: top var(--transition-fast);
    border-radius: 0 0 var(--radius-m) 0;
    font-weight: 600;
    text-decoration: none;
}

.skip-link:focus {
    top: 0;
}

/* Header */
header {
    background: var(--card-bg);
    backdrop-filter: blur(15px);
    padding: 1rem 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 4px 20px var(--shadow-color);
    position: sticky;
    top: 0;
    z-index: 1000;
    border-radius: 0 0 var(--radius-l) var(--radius-l);
    border: 1px solid var(--border-color);
    border-top: none;
}

.logo {
    font-size: 1.3rem;
    font-weight: 800;
    color: var(--primary-color);
    text-decoration: none;
    transition: color var(--transition-fast);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.logo i {
    font-size: 1.5rem;
}

.logo:hover,
.logo:focus {
    color: var(--primary-dark);
}

.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    z-index: 1001;
    padding: 0.5rem;
    border-radius: var(--radius-s);
    transition: background var(--transition-fast);
}

.hamburger:hover,
.hamburger:focus {
    background: rgba(58, 134, 255, 0.1);
}

.hamburger span {
    width: 25px;
    height: 3px;
    background: var(--text-color);
    border-radius: 3px;
    transition: all var(--transition-fast);
}

.hamburger.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.hamburger.active span:nth-child(2) {
    opacity: 0;
}

.hamburger.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -7px);
}

.nav-menu {
    display: flex;
    gap: 1rem;
    background: var(--card-bg);
    padding: 0.5rem;
    border-radius: var(--radius-l);
    box-shadow: 0 4px 12px var(--shadow-color);
    transition: transform var(--transition-medium);
    backdrop-filter: blur(10px);
    border: 1px solid var(--border-color);
}

.nav-link {
    text-decoration: none;
    color: var(--text-color);
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: var(--radius-s);
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.nav-link i {
    font-size: 1.2rem;
}

.nav-link:hover,
.nav-link:focus,
.nav-link[aria-current="page"] {
    background: rgba(58, 134, 255, 0.15);
    color: var(--primary-color);
    transform: translateY(-2px);
}

.nav-link[aria-current="page"] {
    font-weight: 600;
}

.theme-controls {
    display: flex;
    gap: 0.5rem;
}

.theme-toggle,
.contrast-toggle {
    background: none;
    border: none;
    font-size: 1.2rem;
    cursor: pointer;
    padding: 0.5rem;
    border-radius: var(--radius-full);
    transition: all var(--transition-fast);
    color: var(--text-color);
    display: flex;
    align-items: center;
    justify-content: center;
}

.theme-toggle:hover,
.contrast-toggle:hover,
.theme-toggle:focus,
.contrast-toggle:focus {
    background: rgba(58, 134, 255, 0.1);
    transform: scale(1.1);
}

/* Container */
.container {
    max-width: 1280px;
    width: 100%;
    margin: 0 auto;
    padding: 2rem 1rem;
    flex: 1;
    transition: opacity var(--transition-slow);
    box-sizing: border-box; /* Убедимся, что padding не увеличивает ширину */
}

/* Hero Section */
.hero {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 2rem 0 4rem;
    gap: 2rem;
    animation: fadeIn var(--transition-slow);
}

.hero-content {
    flex: 1;
}

.hero h1 {
    font-size: 3rem;
    font-weight: 800;
    margin-bottom: 1.5rem;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    line-height: 1.2;
}

.hero p {
    font-size: 1.2rem;
    margin-bottom: 2rem;
    color: var(--text-secondary);
    max-width: 600px;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
}

.hero-illustration {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
}

.security-shield {
    position: relative;
    width: 240px;
    height: 280px;
    margin: 0 auto;
}

.shield-inner {
    position: absolute;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, var(--primary-light), var(--secondary-color));
    border-radius: 120px 120px 20px 20px / 200px 200px 80px 80px;
    box-shadow: 0 10px 30px rgba(58, 134, 255, 0.3);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.shield-inner::before {
    content: '';
    position: absolute;
    width: 90%;
    height: 95%;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 110px 110px 15px 15px / 190px 190px 70px 70px;
    box-shadow: inset 0 0 30px rgba(255, 255, 255, 0.4);
}

.shield-icon {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: rgba(255, 255, 255, 0.9);
    width: 80px;
    height: 80px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1;
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.15);
}

.shield-icon i {
    font-size: 40px;
    color: var(--primary-color);
}

/* Buttons */
.btn {
    padding: 0.8rem 1.8rem;
    border: none;
    border-radius: var(--radius-m);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    justify-content: center;
    text-decoration: none;
    will-change: transform, box-shadow;
    position: relative;
    overflow: hidden;
}

.btn i {
    font-size: 1.2rem;
}

.primary-btn {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: #fff;
    box-shadow: 0 4px 12px rgba(58, 134, 255, 0.3);
}

.primary-btn:hover,
.primary-btn:focus {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(58, 134, 255, 0.4);
    background: linear-gradient(135deg, var(--primary-light), var(--primary-color));
}

.outline-btn {
    background: transparent;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
    padding: calc(0.8rem - 2px) calc(1.8rem - 2px);
}

.outline-btn:hover,
.outline-btn:focus {
    background: rgba(58, 134, 255, 0.1);
    transform: translateY(-3px);
    box-shadow: 0 4px 12px rgba(58, 134, 255, 0.15);
}

.pulse {
    position: relative;
}

.pulse::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    border-radius: var(--radius-m);
    background: rgba(58, 134, 255, 0.4);
    animation: pulse 2s infinite;
    z-index: -1;
}

@keyframes pulse {
    0% { transform: scale(1); opacity: 0.6; }
    50% { transform: scale(1.1); opacity: 0; }
    100% { transform: scale(1); opacity: 0; }
}

/* Dashboard Grid */
.dashboard-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    margin-bottom: 3rem;
}

.progress-dashboard,
.daily-goal-container,
.lesson-content,
.quiz-container,
.profile-container,
.modal-content,
.lesson-card,
.achievement-card,
.badge-card,
.leaderboard-item,
.profile-card,
.activity-stats {
    background: var(--card-bg, rgb(120, 120, 120));
    border-radius: var(--radius-l, 12px);
    padding: 1.5rem;
    backdrop-filter: blur(20px);
    animation: fadeIn 0.3s ease-out;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    width: 100%;
    box-sizing: border-box;
}


h2 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

h2 i, h3 i {
    color: var(--primary-color);
}

.progress-circle {
    position: relative;
    width: 140px;
    height: 140px;
    margin: 0 auto 1.5rem;
}

.progress-circle svg {
    width: 100%;
    height: 100%;
    transform: rotate(-90deg);
}

.progress-circle-bg {
    fill: none;
    stroke: rgba(58, 134, 255, 0.1);
    stroke-width: 10;
}

.progress-circle-fill {
    fill: none;
    stroke: url(#progressGradient);
    stroke-width: 10;
    stroke-linecap: round;
    stroke-dasharray: 283;
    stroke-dashoffset: 283;
    transition: stroke-dashoffset var(--transition-slow);
}

.progress-circle-text {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--primary-color);
}

.progress-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
}

.stat-item {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    padding: 1rem;
    border-radius: var(--radius-m);
    background: rgba(255, 255, 255, 0.5);
    transition: transform var(--transition-fast), background var(--transition-fast);
}

.dark-mode .stat-item {
    background: rgba(30, 38, 64, 0.5);
}

.stat-item:hover {
    transform: translateY(-3px);
    background: rgba(255, 255, 255, 0.8);
}

.dark-mode .stat-item:hover {
    background: rgba(30, 38, 64, 0.8);
}

.stat-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: var(--radius-s);
    background: rgba(58, 134, 255, 0.1);
    color: var(--primary-color);
}

.stat-icon i {
    font-size: 1.3rem;
}

.stat-data {
    flex: 1;
}

.stat-label {
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin-bottom: 0.2rem;
}

.stat-value {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-color);
}

.dark-mode .stat-value {
    color: var(--dark-text-color);
}

/* Daily Goal */
#daily-goal-text {
    font-size: 1.1rem;
    margin-bottom: 1.5rem;
}

.streak-container {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-top: 1rem;
}

.streak-icon {
    font-size: 1.8rem;
    animation: flame 0.6s ease-in-out infinite alternate;
}

@keyframes flame {
    from { transform: scale(1); opacity: 0.8; }
    to { transform: scale(1.1); opacity: 1; }
}

.streak-bar {
    flex: 1;
    height: 12px;
    background: rgba(58, 134, 255, 0.1);
    border-radius: var(--radius-full);
    overflow: hidden;
    position: relative;
}

.streak-progress {
    height: 100%;
    background: linear-gradient(90deg, var(--warning-color), var(--primary-color));
    border-radius: var(--radius-full);
    transition: width 1s ease-in-out;
}

#streak-count {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--primary-color);
}

/* Sections */
.lessons-section,
.leaderboard-section {
    margin-bottom: 3rem;
}

.lessons-grid,
.achievements-grid,
.badges-grid,
.leaderboard {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
}

.lesson-card,
.achievement-card,
.badge-card,
.leaderboard-item {
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    position: relative;
    overflow: hidden;
}

.lesson-card:hover,
.achievement-card:hover,
.badge-card:hover,
.leaderboard-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 35px var(--shadow-strong);
}

.lesson-card::before,
.achievement-card::before,
.badge-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: linear-gradient(to bottom, var(--primary-color), var(--secondary-color));
}

.lesson-card h3,
.achievement-card h4,
.badge-card h4,
.leaderboard-item h4 {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 0.8rem;
    color: var(--text-color);
}

.dark-mode .lesson-card h3,
.dark-mode .achievement-card h4,
.dark-mode .badge-card h4,
.dark-mode .leaderboard-item h4 {
    color: var(--dark-text-color);
}

.lesson-card p,
.achievement-card p,
.badge-card p,
.leaderboard-item p {
    font-size: 0.95rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.status {
    position: absolute;
    top: 1rem;
    right: 1rem;
    padding: 0.4rem 0.8rem;
    border-radius: var(--radius-full);
    font-size: 0.8rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.3rem;
}

.status.not-started {
    background: rgba(58, 134, 255, 0.1);
    color: var(--primary-color);
}

.status.in-progress {
    background: rgba(255, 190, 11, 0.1);
    color: var(--warning-color);
}

.status.completed {
    background: rgba(72, 218, 137, 0.1);
    color: var(--success-color);
}

/* Lesson Content */
.lesson-content h2 {
    font-size: 2rem;
    font-weight: 800;
    margin-bottom: 1.5rem;
    color: var(--primary-color);
}

.lesson-content h3 {
    font-size: 1.5rem;
    margin: 2rem 0 1rem;
    color: var(--primary-color);
    font-weight: 700;
}

.lesson-content p,
.lesson-content li {
    font-size: 1.05rem;
    margin-bottom: 1rem;
    line-height: 1.7;
}

/* Quiz Section */
.quiz-container h3 {
    font-size: 1.8rem;
    margin-bottom: 2rem;
    color: var(--primary-color);
    text-align: center;
    font-weight: 700;
}

.quiz-question {
    margin-bottom: 2rem;
    padding: 1.5rem;
    background: rgba(255, 255, 255, 0.3);
    border-radius: var(--radius-m);
    border: 1px solid var(--border-color);
}

.dark-mode .quiz-question {
    background: rgba(30, 38, 64, 0.3);
    border-color: var(--dark-border-color);
}

.quiz-option {
    padding: 1rem;
    background: rgba(255, 255, 255, 0.5);
    border-radius: var(--radius-s);
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    margin-bottom: 0.8rem;
    border: 1px solid transparent;
}

.dark-mode .quiz-option {
    background: rgba(30, 38, 64, 0.5);
}

.quiz-option:hover,
.quiz-option:focus-within {
    background: rgba(58, 134, 255, 0.1);
    border-color: var(--primary-color);
}

.quiz-option input[type="radio"] {
    margin-right: 0.8rem;
    accent-color: var(--primary-color);
    width: 18px;
    height: 18px;
}

.quiz-submit {
    margin: 2rem auto 0;
    width: 100%;
    max-width: 300px;
}

.result-container {
    margin-top: 1.5rem;
    padding: 1.5rem;
    border-radius: var(--radius-m);
    font-weight: 500;
    text-align: center;
    animation: fadeIn var(--transition-fast);
}

.success {
    background: rgba(72, 218, 137, 0.2);
    color: var(--success-color);
}

.error {
    background: rgba(255, 90, 101, 0.2);
    color: var(--error-color);
}

.lesson-navigation {
    display: flex;
    justify-content: space-between;
    margin-top: 2rem;
}

/* Profile Page */
.profile-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
}

.profile-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.avatar-wrapper {
    position: relative;
    margin-bottom: 1.5rem;
}

.avatar-wrapper img {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    object-fit: cover;
    border: 3px solid var(--primary-color);
    padding: 3px;
    background: white;
}

.avatar-edit-btn {
    position: absolute;
    bottom: 0;
    right: 0;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--primary-color);
    color: white;
    border: none;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.avatar-edit-btn:hover {
    background: var(--primary-dark);
    transform: scale(1.1);
}

.profile-details {
    width: 100%;
}

.profile-field {
    display: flex;
    align-items: center;
    margin-bottom: 1rem;
    padding: 0.8rem;
    border-radius: var(--radius-s);
    background: rgba(255, 255, 255, 0.3);
}

.dark-mode .profile-field {
    background: rgba(30, 38, 64, 0.3);
}

.profile-field label,
.profile-label {
    font-weight: 600;
    margin-right: 0.5rem;
    width: 80px;
    text-align: left;
}

.profile-field input {
    flex: 1;
    padding: 0.5rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-s);
    font-size: 1rem;
    transition: border-color var(--transition-fast);
    background: rgba(255, 255, 255, 0.8);
}

.dark-mode .profile-field input {
    background: rgba(30, 38, 64, 0.8);
    color: var(--dark-text-color);
    border-color: var(--dark-border-color);
}

.profile-field input:focus {
    border-color: var(--primary-color);
    outline: none;
    box-shadow: 0 0 0 2px rgba(58, 134, 255, 0.2);
}

.profile-value {
    font-weight: 600;
    color: var(--primary-color);
}

.activity-stats {
    padding: 1.5rem;
}

.activity-calendar {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    grid-template-rows: repeat(5, 1fr);
    gap: 5px;
    margin-top: 1rem;
}

.activity-day {
    aspect-ratio: 1;
    border-radius: var(--radius-s);
    background: rgba(255, 255, 255, 0.3);
    transition: transform var(--transition-fast);
}

.dark-mode .activity-day {
    background: rgba(30, 38, 64, 0.3);
}

.activity-day:hover {
    transform: scale(1.1);
}

.activity-day.active-low {
    background: rgba(58, 134, 255, 0.2);
}

.activity-day.active-medium {
    background: rgba(58, 134, 255, 0.5);
}

.activity-day.active-high {
    background: rgba(58, 134, 255, 0.8);
}

/* Loading Spinner */
.loading-spinner {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100px;
}

.spinner-inner {
    width: 40px;
    height: 40px;
    border: 4px solid rgba(58, 134, 255, 0.3);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    margin: -1px;
    padding: 0;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1002;
    align-items: center;
    justify-content: center;
    animation: fadeIn var(--transition-fast);
    backdrop-filter: blur(5px);
}

.modal[style*="display: flex"] {
    display: flex;
}

.modal-content {
    max-width: 500px;
    width: 90%;
    text-align: center;
    transform: scale(0.8);
    animation: modalPop var(--transition-medium) forwards;
    position: relative;
    margin: 1rem; /* Добавляем отступы, чтобы не прилипало к краям */
    max-height: calc(100vh - 2rem); /* Ограничиваем высоту */
    overflow-y: auto; /* Добавляем прокрутку, если контент не помещается */
}

.modal-close {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-secondary);
    transition: color var(--transition-fast);
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
}

.modal-close:hover {
    color: var(--error-color);
    background: rgba(255, 90, 101, 0.1);
}

.modal-icon {
    width: 70px;
    height: 70px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
    color: white;
    font-size: 2rem;
}

@keyframes modalPop {
    to { transform: scale(1); }
}

.modal-content h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    font-weight: 700;
}

.modal-content p {
    font-size: 1rem;
    margin-bottom: 2rem;
    color: var(--text-secondary);
}

.modal-buttons {
    display: flex;
    justify-content: center;
    gap: 1rem;
}

/* Toast Notifications */
#toast-container {
    position: fixed;
    top: 1rem;
    right: 1rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    z-index: 10000;
    max-width: calc(100vw - 2rem); /* Ограничиваем ширину контейнера до ширины экрана с отступами */
}

.toast {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem;
    background: var(--card-bg);
    color: var(--text-color);
    border-radius: var(--radius-m);
    box-shadow: 0 2px 8px var(--shadow-color);
    animation: toastPop var(--transition-medium) forwards;
    width: fit-content;
    max-width: 350px;
    font-size: 0.9rem;
    transition: opacity var(--transition-medium), transform var(--transition-medium);
}

.toast.show {
    opacity: 1;
    transform: translateX(0);
}

.toast.success {
    border-left-color: var(--success-color);
}

.toast.error {
    border-left-color: var(--error-color);
}

.toast.warning {
    border-left-color: var(--warning-color);
}

.toast-icon {
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    font-size: 1.1rem;
}

.toast.success .toast-icon {
    background: rgba(72, 218, 137, 0.2);
    color: var(--success-color);
}

.toast.error .toast-icon {
    background: rgba(255, 90, 101, 0.2);
    color: var(--error-color);
}

.toast.warning .toast-icon {
    background: rgba(255, 190, 11, 0.2);
    color: var(--warning-color);
}

.toast-content {
    flex: 1;
}

.toast-title {
    font-weight: 600;
    margin-bottom: 0.2rem;
}

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

.toast-close {
    background: none;
    border: none;
    font-size: 1rem;
    cursor: pointer;
    color: var(--text-secondary);
    transition: color var(--transition-fast);
}

.toast-close:hover {
    color: var(--text-color);
}

/* Footer */
footer {
    background: var(--card-bg);
    padding: 2rem;
    box-shadow: 0 -4px 12px var(--shadow-color);
    border-radius: var(--radius-l) var(--radius-l) 0 0;
    margin-top: 3rem;
    backdrop-filter: blur(15px);
    border: 1px solid var(--border-color);
    border-bottom: none;
}

.footer-content {
    max-width: 1280px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.footer-logo i {
    font-size: 1.5rem;
}

.footer-links {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 1.5rem;
    margin-top: 1rem;
}

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    transition: color var(--transition-fast);
    display: flex;
    align-items: center;
    gap: 0.3rem;
}

.social-link i {
    font-size: 1.1rem;
}

.footer-links a:hover,
.footer-links a:focus {
    color: var(--primary-color);
}

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

/* Media Queries */
@media (prefers-reduced-motion: reduce) {
    *, *:before, *:after {
        animation: none !important;
        transition: none !important;
    }
}

@media (max-width: 992px) {
    .hero {
        flex-direction: column;
    }
    
    .hero h1 {
        font-size: 2.5rem;
    }
    
    .dashboard-grid {
        grid-template-columns: 1fr;
    }
    
    .profile-container {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .hero h1 { 
        font-size: 2rem; 
    }
    
    .hero p { 
        font-size: 1rem; 
    }
    
    .hamburger { 
        display: flex; 
    }
    
    .nav-menu {
        position: fixed;
        top: 0;
        right: 0;
        width: min(280px, 90vw);
        height: 100%;
        flex-direction: column;
        padding: 5rem 2rem 2rem;
        border-radius: var(--radius-l) 0 0 var(--radius-l);
        box-shadow: -4px 0 15px var(--shadow-color);
        z-index: 1000;
        transform: translateX(100%);
        transition: transform var(--transition-medium);
    }
    
    .nav-menu[aria-hidden="false"] {
        transform: translateX(0);
    }
    .nav-menu.active {
        transform: translateX(0);
    }
    
    .nav-link {
        padding: 1rem;
        font-size: 1.1rem;
        width: 100%;
        justify-content: flex-start;
    }
    
    .theme-controls { 
        position: absolute; 
        top: 1rem; 
        right: 4.5rem; 
    }
    
    .progress-stats {
        grid-template-columns: 1fr;
    }
    .nav-overlay {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background: rgba(0, 0, 0, 0.5);
        opacity: 0;
        visibility: hidden;
        transition: opacity var(--transition-medium), visibility var(--transition-medium);
        z-index: 999;
    }
    .nav-overlay.active {
        opacity: 1;
        visibility: visible;
    }
}

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

@media (max-width: 480px) {
    .container {
        padding: 1rem;
    }
    
    .hero h1 { 
        font-size: 1.8rem; 
    }
    
    .btn { 
        padding: 0.7rem 1.5rem; 
        font-size: 0.9rem; 
    }
    
    .lessons-grid, 
    .achievements-grid, 
    .badges-grid { 
        grid-template-columns: 1fr; 
    }
    
    .modal-content { 
        padding: 1.5rem; 
    }
    
    .theme-controls { 
        right: 4rem; 
    }
    
    footer {
        padding: 1.5rem 1rem;
    }
    
    .footer-links {
        flex-direction: column;
        align-items: center;
        gap: 1rem;
    }
    .toast {
        max-width: calc(100vw - 3rem); /* Ограничиваем ширину тоста до ширины экрана минус отступы */
        font-size: 0.85rem; /* Уменьшаем шрифт для компактности */
        padding: 0.5rem; /* Уменьшаем внутренние отступы */
    }
}

/* Add to styles.css */
.no-achievements-message, .no-badges-message {
    text-align: center;
    padding: 20px;
    background: #00000000; /* Transparent background */
    border-radius: 8px;
    margin: 20px 0;
}
.no-achievements-message p, .no-badges-message p {
    margin-bottom: 15px;
    font-size: 1.1em;
}
.achievement-status, .badge-status {
    font-size: 0.9em;
    margin-top: 10px;
    color: #000000; /* Green status text */
}
.achievement-card.locked, .badge-card.locked {
    opacity: 0.6;
    filter: grayscale(80%);
}
.achievement-icon, .badge-icon {
    font-size: 2em;
    margin-bottom: 10px;
    display: flex;
    justify-content: center;
    align-items: center;
}
.achievement-card.locked .achievement-icon, .badge-card.locked .badge-icon {
    color: #888; /* Gray color for lock icon */
}
.achievement-card.locked .achievement-icon::before, .badge-card.locked .badge-icon::before {
    content: "\1F512"; /* Unicode for 🔒 */
    font-family: 'Arial', sans-serif; /* Ensure emoji support */
}

.activity-statistics {
    margin-top: 20px;
    max-height: 400px;
    overflow-y: auto;
    padding: 10px;
    border: 1px solid #e0e0e0;
    border-radius: 8px;
}

.activity-item {
    display: flex;
    align-items: center;
    padding: 10px;
    border-bottom: 1px solid #f0f0f0;
}

.activity-icon {
    font-size: 24px;
    margin-right: 10px;
}

.activity-details {
    flex: 1;
}

.activity-text {
    margin: 0;
    font-weight: 500;
}

.activity-time {
    margin: 0;
    font-size: 0.9em;
    color: #666;
}

.no-activity {
    text-align: center;
    color: #888;
    padding: 20px;
}

.typing-indicator {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 14px 20px;
    margin-bottom: 20px;
    max-width: 75%;

    backdrop-filter: blur(16px) saturate(180%);
    -webkit-backdrop-filter: blur(16px) saturate(180%);
    
    font-family: "Inter", sans-serif;
    font-size: 14px;
    color: #fff;

    animation: fadeIn 0.4s ease-out;
    transition: all 0.3s ease;
}

#show-more-available-btn,
#show-more-completed-btn {
    margin-top: 20px;
    display: none; /* Скрыты по умолчанию */
    width: fit-content;
    margin-left: auto;
    margin-right: auto;
}

/* Контейнер для кнопки "Ещё" */
.show-more-container {
    display: flex;
    justify-content: center;
    margin-top: var(--space-m);
    padding: var(--space-s);
}

/* Стили для кнопки "Ещё" */
.btn.outline-btn.show-more-btn {
    display: inline-block;
    width: auto;
    padding: var(--space-s) var(--space-m);
    font-size: var(--font-size-s);
    text-align: center;
    background-color: transparent;
    border: 2px solid var(--primary-color);
    color: var(--primary-color);
    border-radius: var(--radius-m);
    transition: background-color var(--transition-medium), color var(--transition-medium);
}

.btn.outline-btn.show-more-btn:hover {
    background-color: var(--primary-color);
    color: var(--white);
    cursor: pointer;
}

/* Адаптивность для мобильных устройств */
@media (max-width: 768px) {
    .show-more-container {
        margin-top: var(--space-s);
    }
    .btn.outline-btn.show-more-btn {
        font-size: var(--font-size-xs);
        padding: var(--space-xs) var(--space-s);
    }
}

/* Темная тема */
body.dark-mode .btn.outline-btn.show-more-btn {
    border-color: var(--dark-primary);
    color: var(--dark-primary);
}

body.dark-mode .btn.outline-btn.show-more-btn:hover {
    background-color: var(--dark-primary);
    color: var(--dark-white);
}

/* Высококонтрастный режим */
body.high-contrast .btn.outline-btn.show-more-btn {
    border-color: var(--contrast-primary);
    color: var(--contrast-primary);
    background-color: var(--contrast-bg-color);
}

body.high-contrast .btn.outline-btn.show-more-btn:hover {
    background-color: var(--contrast-primary);
    color: var(--contrast-bg-color);
}

.lessons-section {
    margin-bottom: var(--space-xl);
}

.lessons-section h2 {
    font-size: var(--font-size-l);
    margin-bottom: var(--space-m);
    color: var(--text-color);
}

body.dark-mode .lessons-section h2 {
    color: var(--dark-text);
}

body.high-contrast .lessons-section h2 {
    color: var(--contrast-text);
}

.no-lessons-message {
    text-align: center;
    font-size: var(--font-size-m);
    color: var(--text-muted);
    padding: var(--space-m);
}

body.dark-mode .no-lessons-message {
    color: var(--dark-text-muted);
}

body.high-contrast .no-lessons-message {
    color: var(--contrast-text);
}

/* Стили для контейнера уроков */
.lessons-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    padding: 1rem;
    width: 100%;
    box-sizing: border-box;
}

/* Стили для карточек уроков */
.lesson-card {
    background: var(--card-bg, #fff);
    border-radius: 12px;
    padding: 1.5rem;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease;
}

.lesson-card:hover {
    transform: translateY(-5px);
}

/* Стили для контейнера кнопки "Ещё" */
.show-more-container {
    display: flex;
    justify-content: center;
    align-items: center;
    margin: 1.5rem 0;
    width: 100%;
}

/* Стили для кнопки "Ещё" */
.show-more-btn {
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
    font-weight: 500;
    border: 2px solid var(--primary-color, #5b7fff);
    background: transparent;
    color: var(--primary-color, #5b7fff);
    border-radius: 8px;
    cursor: pointer;
    transition: background 0.3s ease, color 0.3s ease, transform 0.2s ease;
}

.show-more-btn:hover {
    background: var(--primary-color, #5b7fff);
    color: #fff;
    transform: scale(1.05);
}

.show-more-btn:focus {
    outline: 3px solid var(--focus-color, #3b5bff);
    outline-offset: 2px;
}

/* Адаптивность для мобильных устройств */
@media (max-width: 768px) {
    .lessons-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
        padding: 0.5rem;
    }

    .show-more-container {
        margin: 1rem 0;
    }

    .show-more-btn {
        padding: 0.5rem 1rem;
        font-size: 0.9rem;
    }
}

.show-more-container { display: flex !important; }
.show-more-btn { display: block !important; }

.notification-modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.notification-content {
    background: var(--card-bg, #fff);
    border-radius: 12px;
    padding: 2rem;
    max-width: 400px;
    width: 90%;
    text-align: center;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
    transform: scale(0.8);
    transition: transform 0.3s ease;
}

.notification-modal[aria-hidden="false"] .notification-content {
    transform: scale(1);
}

.notification-content p {
    margin: 0 0 1.5rem;
    font-size: 1.1rem;
}

.notification-content button {
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
    border: none;
    background: var(--primary-color, #5b7fff);
    color: #fff;
    border-radius: 8px;
    cursor: pointer;
    transition: background 0.3s ease;
}

.notification-content button:hover {
    background: var(--focus-color, #3b5bff);
}

.notification-content button:focus {
    outline: 3px solid var(--focus-color, #3b5bff);
    outline-offset: 2px;
}

/* Адаптивность для мобильных устройств */
@media (max-width: 768px) {
    .lessons-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
        padding: 0.5rem;
    }

    .show-more-container {
        margin: 1.5rem 0;
    }

    .btn.outline-btn {
        padding: 0.5rem 1.5rem;
        font-size: 0.9rem;
    }

    #continue-learning-btn {
        padding: 0.5rem 1rem;
        font-size: 0.9rem;
    }

    .notification-content {
        padding: 1.5rem;
        max-width: 300px;
    }
}

/* Notification modal */
#progress-moved-notification {
    display: flex;
    align-items: center;
    justify-content: center;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.65);
    z-index: 1000;
    opacity: 0;
    animation: fadeIn 0.4s ease-out forwards;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

#progress-moved-notification .modal-content {
    background: var(--card-bg, rgba(255, 255, 255, 0.98));
    border-radius: var(--radius-l, 16px);
    padding: 2rem;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
    backdrop-filter: blur(10px);
    text-align: center;
    max-width: 440px;
    width: 90%;
    margin: 0 auto;
    transform: translateY(20px);
    animation: slideUp 0.5s ease-out forwards;
}

@keyframes slideUp {
    from { transform: translateY(20px); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}

#progress-moved-notification h3 {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    font-size: 1.4rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-primary, #1a1d21);
}

#progress-moved-notification p {
    font-size: 1.05rem;
    line-height: 1.5;
    margin-bottom: 1.5rem;
    color: var(--text-secondary, #4b5563);
}

#progress-moved-notification .primary-btn {
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
    font-weight: 500;
    border-radius: 8px;
    transition: transform 0.2s, box-shadow 0.2s;
    background: var(--primary, #3b82f6);
    color: white;
    border: none;
    cursor: pointer;
}

#progress-moved-notification .primary-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
}

@media (max-width: 480px) {
    #progress-moved-notification .modal-content {
        padding: 1.5rem;
        max-width: 320px;
    }

    #progress-moved-notification h3 {
        font-size: 1.2rem;
    }

    #progress-moved-notification p {
        font-size: 0.95rem;
        margin-bottom: 1.25rem;
    }
    
    #progress-moved-notification .primary-btn {
        padding: 0.6rem 1.25rem;
    }
}

/* Стили для нового мобильного навигационного меню */
.mobile-nav {
    display: none;
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: var(--card-bg);
    backdrop-filter: blur(10px);
    border-top: 1px solid var(--border-color);
    box-shadow: 0 -4px 5px var(--shadow-color);
    z-index: 10000; /* Высокий z-index, чтобы быть поверх всех элементов */
    padding: var(--space-s) 0;
    animation: slideUpNav 0.3s ease-out forwards;
}

.mobile-nav-links {
    display: flex;
    justify-content: space-around;
    align-items: center;
    width: 100%;
}

.mobile-nav-link {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: var(--space-m);
    color: var(--text-color);
    text-decoration: none;
    transition: all var(--transition-fast);
    position: relative;
    max-width: 80px;
}

.mobile-nav-link i {
    font-size: 1.8rem;
}

.mobile-nav-link:hover,
.mobile-nav-link:focus,
.mobile-nav-link[aria-current="page"] {
    color: var(--primary-color);
    background: rgba(58, 134, 255, 0.1);
    transform: scale(1.1);
}

.mobile-nav-link[aria-current="page"]::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 6px;
    height: 6px;
    background: var(--primary-color);
    border-radius: 50%;
}

body.dark-mode .mobile-nav-link {
    color: var(--dark-text-color);
}

body.dark-mode .mobile-nav-link:hover,
body.dark-mode .mobile-nav-link:focus,
body.dark-mode .mobile-nav-link[aria-current="page"] {
    color: var(--primary-color);
}

@media (max-width: 768px) {
    .mobile-nav {
        display: flex;
    }

    /* Скрываем старое мобильное меню и гамбургер-меню */
    .hamburger,
    .nav-menu {
        display: none;
    }

    /* Увеличиваем отступ снизу для контента, чтобы не перекрывать новое меню */
    .container {
        padding-bottom: 5rem;
    }
}

@media (prefers-reduced-motion: reduce) {
    .mobile-nav {
        animation: none;
    }
}

@media (max-width: 480px) {
    .profile-page {
        padding-bottom: 8rem; /* Ещё больше отступа для маленьких экранов */
    }

    .profile-card,
    .activity-stats,
    .dashboard-grid {
        padding: var(--space-s);
    }

    .avatar-selector img {
        width: 60px;
        height: 60px;
    }

    .profile-field label,
    .profile-field span {
        font-size: 0.85rem;
    }

    .progress-circle {
        width: 100px;
        height: 100px;
    }
}

@media (max-width: 768px) {
    .profile-page {
        padding-bottom: 7rem; /* Дополнительный отступ для навигации и кнопки ИИ */
    }

    .profile-card {
        padding: var(--space-m);
        max-width: 100%;
    }

    .avatar-selector img {
        width: 80px;
        height: 80px;
    }

    .profile-details {
        gap: var(--space-xs);
    }

    .profile-field input,
    .profile-field button {
        font-size: 0.9rem;
    }

    .activity-stats {
        padding: var(--space-m);
    }

    .dashboard-grid {
        gap: var(--space-m);
    }

    .progress-dashboard,
    .daily-goal-container {
        padding: var(--space-m);
    }

    .progress-circle {
        width: 120px;
        height: 120px;
        margin: 0 auto;
    }

    .progress-circle svg {
        width: 100%;
        height: 100%;
    }

    .progress-stats {
        display: flex;
        flex-direction: column;
        gap: var(--space-s);
    }

    .stat-item {
        flex-direction: row;
        align-items: center;
        gap: var(--space-s);
    }
}