:root {
    --bg-color: #ffead6;
    --text-main: #1F2937;
    --text-secondary: #4a4a4a;
    --card-color: #FFFFFF;
    --card-secondary: #f0f0f0;
    --text-black: #1a1a1a;
    --navbar-bg: rgba(255, 255, 255, 0.25);
    --main-accent: #fa973a;
    --blue-accent: #5D9CEC;
    --ipc-accent: #a06af8;
    --mat-accent: #4ddb7c;
    --icse-accent: #FFCE54;
    --hero-main-text: #293447;
    --tag-purple-bg: #F3F0FF;
    --tag-green-bg: #ECFDF5;
    --tag-orange-bg: #FFF7ED;
    --card-border: rgba(0, 0, 0, 0.212);
    --shadow-sm: 0 4px 6px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 10px 30px rgba(0, 0, 0, 0.199);
    --shadow-card: 0 10px 25px -5px rgba(0, 0, 0, 0.24);
    --shadow-card-hover: 0 10px 25px -5px rgba(0, 0, 0, 0.40);
    --skeleton-bg: #e2e8f0;
    --skeleton-shimmer: rgba(255, 255, 255, 0.5);
    --transition-fast: all 0.2s ease;
    --transition-medium: all 0.3s ease;

    --accent-yellow: #fdec6a;
    --accent-red: #ef4444;
    --accent-blue-light: #93c5fd;
    --accent-pink: #f9a8d4;
    --clue-accent: #ff8f26;
    --code-bg: #d8d8d8;
    --code-text: #000000;
}

[data-theme="dark"] {
    --bg-color: #212327;
    --text-main: #E5E7EB;
    --text-secondary: #9CA3AF;
    --card-color: #292929;
    --card-secondary: #212327;
    --navbar-bg: rgba(30, 30, 50, 0.25);
    --hero-main-text: #F3F4F6;
    --tag-purple-bg: rgba(160, 106, 248, 0.15);
    --tag-green-bg: rgba(77, 219, 124, 0.15);
    --tag-orange-bg: rgba(250, 151, 58, 0.15);
    --card-border: rgba(255, 255, 255, 0.1);
    --skeleton-bg: #202122;
    --skeleton-shimmer: rgba(255, 255, 255, 0.1);
    --code-bg: #1b1b1b;
    --code-text: #ffffff;
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    line-height: 1.5;
}

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

.hidden {
    display: none !important;
}

.skeleton {
    position: relative;
    overflow: hidden;
    background-color: var(--skeleton-bg) !important;
    border-color: var(--skeleton-bg) !important;
    color: transparent !important;
    pointer-events: none;
    user-select: none;
}

.skeleton::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(90deg, transparent 0%, var(--skeleton-shimmer) 50%, transparent 100%);
    animation: shimmer 1s infinite;
}

@keyframes shimmer {
    0% {
        transform: translateX(-100%);
    }

    100% {
        transform: translateX(100%);
    }
}

.loading {
    position: relative;
    color: transparent !important;
    pointer-events: none;
}

.loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 18px;
    height: 18px;
    margin: -9px 0 0 -9px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

.container {
    max-width: 68.75rem;
    margin: 0 auto;
    padding: 0 1.25rem;
}

.main-body {
    position: relative;
    padding-bottom: 5rem;
    margin-top: -6.25rem;
    border-top-left-radius: 0;
    background: linear-gradient(to bottom, transparent 0%, var(--bg-color) 6.25rem);
}

.header-section {
    width: 100%;
    min-height: 85vh;
    background-image: url('../assets/background-waves.webp');
    background-size: cover;
    background-position: center bottom;
    background-repeat: no-repeat;
    position: relative;
    display: flex;
    flex-direction: column;
}

[data-theme="dark"] .header-section {
    background-image: url('../assets/background-waves-dark.webp');
}

.hero-content {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: flex-start;
    margin-top: 14rem;
    padding-bottom: 16rem;
}

.hero-text-box {
    max-width: 34.375rem;
    margin-top: 0;
    text-align: center;
}

.hero-text-box h1 {
    font-size: 3.5rem;
    color: var(--hero-main-text);
    margin-bottom: 1.25rem;
    letter-spacing: -3px;
    text-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.hero-text-box p {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: 2.2rem;
    font-weight: 500;
}

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 5px 1.875rem;
    position: fixed;
    width: 100%;
    z-index: 1000;
    background: var(--navbar-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}

.logo img {
    height: 7.5rem;
    width: auto;
    display: block;
}

.logo .logo-dark {
    display: none;
}

[data-theme="dark"] .logo .logo-light {
    display: none;
}

[data-theme="dark"] .logo .logo-dark {
    display: block;
}

.nav-center {
    display: flex;
    align-items: center;
    gap: 0.625rem;
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
}

.nav-right {
    display: flex;
    align-items: center;
    gap: 0.625rem;
}

.nav-item {
    text-decoration: none;
    color: var(--text-main);
    font-weight: 600;
    padding: 0.625rem 1.25rem;
    border-radius: 0.625rem;
    transition: var(--transition-fast);
    display: flex;
    align-items: center;
    gap: 0.625rem;
}

.nav-item:hover {
    background-color: rgba(255, 255, 255, 0.5);
    color: var(--main-accent);
}

.nav-item.active {
    background-color: rgba(250, 151, 58, 0.1);
    color: var(--main-accent);
    border: 1px solid rgba(250, 151, 58, 0.2);
}

.btn-nav-cta {
    background-color: var(--main-accent);
    color: white;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--main-accent);
    display: flex;
    align-items: center;
    gap: 0.625rem;
}

.btn-nav-cta:hover {
    background-color: white;
    color: var(--main-accent);
    border-color: var(--main-accent);
    transform: translateY(-2px);
}

.mobile-controls {
    display: none;
    align-items: center;
    gap: 5px;
}

.mobile-controls .theme-toggle {
    display: flex;
}

.mobile-menu {
    display: none;
}

.hamburger {
    width: 42px;
    height: 42px;
    padding: 0;
    background: none;
    border: 1px solid rgba(0, 0, 0, 0.05);
    border-radius: 8px;
    color: var(--text-main);
    font-size: 1.5rem;
    cursor: pointer;
    transition: var(--transition-medium);
    display: flex;
    align-items: center;
    justify-content: center;
}

.navbar.menu-open .hamburger {
    color: var(--main-accent);
    border-color: rgba(250, 151, 58, 0.2);
    background-color: rgba(250, 151, 58, 0.1);
}

.hamburger:active {
    background-color: rgba(0, 0, 0, 0.05);
}

.theme-toggle {
    background: none;
    border: none;
    color: var(--text-main);
    font-size: 1.3rem;
    cursor: pointer;
    width: 44px;
    height: 44px;
    padding: 0;
    border-radius: 10px;
    transition: var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
}

.theme-toggle:hover {
    background-color: rgba(255, 255, 255, 0.5);
    color: var(--main-accent);
}

.theme-toggle .fa-sun {
    display: none;
}

.theme-toggle .fa-moon {
    display: block;
}

[data-theme="dark"] .theme-toggle .fa-sun {
    display: block;
}

[data-theme="dark"] .theme-toggle .fa-moon {
    display: none;
}

.social-links {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
}

.social-button {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 3.43rem;
    height: 3.43rem;
    border-radius: 50%;
    text-decoration: none;
    transition: var(--transition-fast);
    font-size: 1.6rem;
}

.social-button:hover {
    transform: translateY(-3px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
}

.social-button.instagram {
    background: linear-gradient(45deg, #f09433, #e6683c, #dc2743, #cc2366, #bc1888);
    color: #fff;
}

.social-button.tiktok {
    background: #000000;
    color: #fff;
}

.stats-wrapper {
    position: relative;
    z-index: 10;
    top: -1.875rem;
}

.stats-card {
    background: var(--card-color);
    border-radius: 1rem;
    padding: 0.9rem 1.875rem;
    box-shadow: var(--shadow-md);
    display: flex;
    align-items: center;
    gap: 1.25rem;
    flex-wrap: wrap;
    border: 1px solid var(--card-border);
}

.stats-title {
    font-weight: 800;
    font-size: 1.1rem;
    color: var(--text-main);
    margin-right: 0.625rem;
}

.stats-tags {
    display: flex;
    gap: 0.9rem;
    flex-wrap: wrap;
}

.tag {
    padding: 0.5rem 1rem;
    border-radius: 0.5rem;
    font-size: 0.85rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.375rem;
    background: var(--tag-bg);
    color: var(--tag-color);
}

.tag.purple {
    --tag-bg: var(--tag-purple-bg);
    --tag-color: #7C3AED;
}

.tag.green {
    --tag-bg: var(--tag-green-bg);
    --tag-color: #059669;
}

.tag.orange {
    --tag-bg: var(--tag-orange-bg);
    --tag-color: #EA580C;
}

.subjects-section {
    margin-top: 1.25rem;
}

.section-heading {
    font-size: 1.4rem;
    margin-bottom: 1.56rem;
    color: var(--text-main);
}

.cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.56rem;
}

.materia-card {
    background: var(--card-color);
    border-radius: 1.25rem;
    padding: 1.56rem;
    box-shadow: var(--shadow-card);
    border-top: 10px solid transparent;
    transition: var(--transition-fast);
}

.materia-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-card-hover);
}

.materia-card.ipc-color {
    --card-accent: var(--ipc-accent);
    border-top-color: var(--card-accent);
}

.materia-card.mat-color {
    --card-accent: var(--mat-accent);
    border-top-color: var(--card-accent);
}

.materia-card.icse-color {
    --card-accent: var(--icse-accent);
    border-top-color: var(--card-accent);
}

.card-top {
    display: flex;
    align-items: center;
    gap: 0.93rem;
    margin-bottom: 1.56rem;
}

.card-top h3 {
    font-size: 1.25rem;
}

.icon-sq {
    width: 3.25rem;
    height: 3.25rem;
    border-radius: 0.875rem;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.8rem;
    transition: var(--transition-fast);
}

.materia-card .icon-sq {
    background-color: color-mix(in srgb, var(--card-accent), transparent 90%);
    color: var(--card-accent);
    border: 1px solid color-mix(in srgb, var(--card-accent), transparent 75%);
}

.includes-block {
    margin-bottom: 1.56rem;
}

.materia-card .includes-block .includes-title {
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin-bottom: 0.75rem;
    font-weight: 600;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--card-accent);
}

.includes-list {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.includes-item {
    display: flex;
    align-items: center;
    gap: 0.625rem;
    font-size: 0.9rem;
    color: var(--text-main);
}

.includes-item i {
    width: 1.125rem;
    text-align: center;
    font-size: 0.85rem;
}

.materia-card .includes-item i {
    color: var(--card-accent);
}

.card-actions {
    display: flex;
    justify-content: flex-end;
}

.btn-acceder {
    padding: 0.625rem 1.25rem;
    border: none;
    border-radius: 0.625rem;
    font-size: 0.85rem;
    font-weight: 600;
    color: rgb(255, 255, 255);
    cursor: pointer;
    transition: var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.btn-acceder i {
    line-height: 1;
    transform: translateY(2px);
}

.materia-card .btn-acceder {
    background-color: var(--card-accent);
    border: 1px solid var(--card-accent);
}

.materia-card .btn-acceder:hover {
    background-color: var(--card-color);
    color: var(--card-accent);
    border-color: var(--card-accent);
}

.btn-comprar {
    padding: 0.625rem 1.64rem;
    border: 1px solid #1DB954;
    border-radius: 0.625rem;
    font-size: 0.85rem;
    font-weight: 600;
    background-color: #1DB954;
    color: white;
    cursor: pointer;
    transition: var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.btn-comprar i {
    line-height: 1;
    transform: translateY(1px);
}

.btn-comprar:hover {
    background-color: var(--card-color);
    color: #1DB954;
    border-color: #1DB954;
}

@media (max-width: 900px) {
    .logo img {
        height: 6.25rem;
    }

    .hero-text-box {
        margin-left: auto;
        margin-right: auto;
        margin-top: 0;
    }

    .hero-text-box h1 {
        font-size: 2.5rem;
        text-wrap: balance;
    }

    .hero-text-box h1 br {
        display: none;
    }

    .header-section {
        background-position: center;
        height: auto;
        min-height: 85vh;
    }

    .hero-content {
        margin-top: 8.125rem;
        margin-bottom: 2.5rem;
    }

    .nav-center,
    .nav-right {
        display: none;
    }

    .mobile-controls {
        display: flex;
    }

    .mobile-controls .theme-toggle {
        width: 42px;
        height: 42px;
        padding: 0;
        border-radius: 10px;
        border: 1px solid rgba(0, 0, 0, 0.05);
    }

    .mobile-controls .theme-toggle:hover {
        background-color: transparent;
        color: var(--text-main);
    }

    [data-theme="dark"] .mobile-controls .hamburger,
    [data-theme="dark"] .mobile-controls .theme-toggle {
        border-color: rgba(255, 255, 255, 0.15);
    }

    .mobile-menu {
        display: none;
        position: fixed;
        top: 6.875rem;
        left: 0;
        width: 100%;
        background: var(--navbar-bg);
        backdrop-filter: blur(12px);
        -webkit-backdrop-filter: blur(12px);
        flex-direction: column;
        padding: 1.25rem;
        z-index: 999;
        align-items: flex-start;
    }

    .mobile-menu.active {
        display: flex;
    }

    .mobile-menu .nav-item {
        width: 100%;
        text-align: center;
        margin-bottom: 0.625rem;
        padding-left: 0.625rem;
        display: block;
    }
}

.mis-materias-content {
    padding-top: 140px;
    min-height: 100vh;
    background-image: url('../assets/background-waves2.webp');
    background-size: cover;
    background-position: center top;
    background-repeat: no-repeat;
    background-attachment: fixed;
}

.page-header h1 {
    font-size: 2rem;
    color: var(--text-main);
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 8px;
}

.page-header p {
    color: var(--text-secondary);
    font-size: 1rem;
}

.materias-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 25px;
}

.materia-detail-card {
    background: var(--card-color);
    border-radius: 20px;
    overflow: hidden;
    box-shadow: var(--shadow-card);
    transition: var(--transition-fast);
}

.materia-detail-card.ipc {
    --materia-accent: var(--ipc-accent);
}

.materia-detail-card.mat {
    --materia-accent: var(--mat-accent);
}

.materia-detail-card.icse {
    --materia-accent: var(--icse-accent);
}

.materia-detail-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-card-hover);
}

.materia-header {
    padding: 20px 25px;
    display: flex;
    align-items: center;
    gap: 15px;
    position: relative;
    border-bottom: 3px solid var(--materia-accent);
    background: color-mix(in srgb, var(--materia-accent), transparent 85%);
}

.materia-icon {
    width: 50px;
    height: 50px;
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    background: color-mix(in srgb, var(--materia-accent), transparent 85%);
    color: var(--materia-accent);
}

.materia-info {
    flex: 1;
}

.materia-info h2 {
    font-size: 1.3rem;
    color: var(--text-main);
    margin-bottom: 4px;
}

.materia-subtitle {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.materia-badge {
    background: rgba(250, 151, 58, 0.15);
    color: var(--main-accent);
    padding: 6px 12px;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 5px;
}

.materia-badge.gold {
    background: rgba(77, 219, 124, 0.15);
    color: var(--mat-accent);
}

.materia-body {
    padding: 25px;
}

.progress-section {
    margin-bottom: 25px;
}

.progress-header {
    display: flex;
    justify-content: space-between;
    margin-bottom: 8px;
    font-size: 0.9rem;
}

.progress-header span:first-child {
    color: var(--text-secondary);
}

.progress-value {
    font-weight: 700;
    color: var(--text-main);
}

.progress-bar-large {
    height: 10px;
    background: var(--card-secondary);
    border-radius: 10px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    border-radius: 10px;
    background: var(--materia-accent);
}

.stats-row {
    display: flex;
    gap: 15px;
    margin-bottom: 25px;
}

.stat-item {
    flex: 1;
    text-align: center;
    padding: 15px 10px;
    background: var(--card-secondary);
    border-radius: 12px;
}

.stat-value {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--text-main);
}

.stat-label {
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-top: 4px;
}

.materia-actions {
    display: flex;
    gap: 12px;
}

.btn-action {
    flex: 1;
    padding: 0.75rem 1rem;
    border-radius: 0.75rem;
    font-size: 0.9rem;
    font-weight: 600;
    text-decoration: none;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    transition: var(--transition-fast);
    border: 1px solid transparent;
}

.btn-action.primary {
    background-color: var(--materia-accent);
    color: white;
    border-color: var(--materia-accent);
}

.btn-action.primary:hover {
    background-color: var(--card-color);
    color: var(--materia-accent);
}

.btn-action.secondary {
    background: var(--card-secondary);
    color: var(--text-main);
}

.btn-action.secondary:hover {
    background-color: color-mix(in srgb, var(--materia-accent), transparent 50%);
}

.add-materia-section {
    text-align: center;
    padding: 40px 0;
}

.btn-add-materia {
    background: transparent;
    border: 2px dashed var(--main-accent);
    color: var(--main-accent);
    padding: 16px 32px;
    border-radius: 12px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 10px;
    transition: var(--transition-fast);
}

.btn-add-materia:hover {
    background: rgba(250, 151, 58, 0.1);
    transform: scale(1.02);
}

@media (max-width: 900px) {
    .mis-materias-content {
        padding-top: 120px;
    }

    .page-header h1 {
        font-size: 1.5rem;
    }

    .materias-grid {
        grid-template-columns: 1fr;
    }

    .materia-header {
        flex-wrap: wrap;
    }

    .materia-badge {
        margin-top: 10px;
    }

    .stats-row {
        flex-wrap: wrap;
    }

    .stat-item {
        min-width: calc(33% - 10px);
    }

    .materia-actions {
        flex-direction: column;
    }
}

[data-theme="dark"] .mis-materias-content {
    background-image: url('../assets/background-waves-dark2.webp');
}

[data-theme="dark"] .progress-bar-large {
    background: var(--card-secondary);
}

[data-theme="dark"] .stat-item {
    background: var(--card-secondary);
}

[data-theme="dark"] .btn-action.secondary {
    background: var(--card-secondary);
    color: var(--text-main);
}

[data-theme="dark"] .btn-action.secondary:hover {
    background: color-mix(in srgb, var(--materia-accent), transparent 50%);
}

.empty-state-container {
    text-align: center;
    background: var(--card-color);
    border-radius: 1.5rem;
    padding: 4rem 2rem;
    box-shadow: var(--shadow-card);
    border: 1px solid var(--card-border);
    margin: 2rem auto;
    max-width: 600px;
    display: none;
}

.empty-state-container.visible {
    display: block;
}

.empty-image {
    width: 22rem;
    max-width: 100%;
    height: auto;
}

@media (max-width: 480px) {
    .empty-state-container {
        padding: 2rem 1rem;
    }

    .empty-image {
        width: 15rem;
    }
}

.empty-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-main);
    margin-bottom: 0.5rem;
}

.empty-description {
    font-size: 1rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
    max-width: 400px;
    margin-left: auto;
    margin-right: auto;
}

[data-theme="dark"] .empty-state-container {
    background: var(--card-secondary);
    border: 1px solid rgba(255, 255, 255, 0.05);
}


.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    z-index: 2000;
    display: none;
    align-items: center;
    justify-content: center;
    opacity: 0;
}

.modal-overlay.active {
    display: flex;
    opacity: 1;
}

.welcome-modal {
    background: var(--card-color);
    width: 550px;
    max-width: 90vw;
    border-radius: 24px;
    box-shadow: var(--shadow-card);
    position: relative;
    transform: translateY(50px);
    border: 1px solid var(--card-border);
}

.modal-overlay.active .welcome-modal {
    transform: translateY(30px);
}

.nocty-mascot {
    position: absolute;
    top: -70px;
    left: 30%;
    transform: translateX(-50%);
    width: 180px;
    height: 140px;
    display: flex;
    justify-content: center;
    align-items: flex-end;
    z-index: 10;
}

.nocty-mascot img {
    width: 30rem;
    height: auto;
}

@media (max-width: 600px) {
    .nocty-mascot {
        width: 140px;
        height: 110px;
        top: -60px;
        left: 30%;
    }

    .nocty-mascot img {
        width: 20rem;
    }
}

@media (max-height: 900px) {
    .welcome-modal {
        transform: scale(0.70) translateY(30px);
    }

    .modal-overlay.active .welcome-modal {
        transform: scale(0.70) translateY(10px);
    }
}

.modal-content {
    padding: 2.5rem 2rem 2rem;
    text-align: center;
    margin-top: 15px;
}

.modal-content h2 {
    font-size: 1.5rem;
    color: var(--text-main);
    margin-bottom: 0.5rem;
    line-height: 1.3;
}

.modal-content p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: 1.5rem;
}

.input-group {
    text-align: left;
    margin-bottom: 1.5rem;
}

.input-group label,
.avatar-selection label {
    display: block;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.input-group input {
    width: 100%;
    padding: 0.875rem 1rem;
    border-radius: 12px;
    border: 2px solid var(--includes-border);
    background: var(--card-secondary);
    color: var(--text-main);
    font-size: 1rem;
    transition: var(--transition-fast);
    outline: none;
}

.input-group input:focus {
    border-color: var(--main-accent);
    box-shadow: 0 0 0 4px rgba(250, 151, 58, 0.1);
}

.avatar-selection {
    text-align: left;
    margin-bottom: 2rem;
}

.avatar-grid {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 10px;
    margin-top: 10px;
}

.avatar-option {
    width: 100%;
    aspect-ratio: 1;
    background: var(--card-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    font-size: 1.2rem;
    color: var(--text-secondary);
    border: 2px solid transparent;
    transition: var(--transition-fast);
}

.avatar-option:hover {
    background: rgba(250, 151, 58, 0.1);
    border: 3px dashed var(--main-accent);
}

.avatar-option.selected {
    background: var(--card-secondary);
    border: 3px solid var(--main-accent);
    transform: scale(1.2);
}

.btn-primary-modal {
    width: 100%;
    padding: 1.25rem;
    background: var(--main-accent);
    color: white;
    font-weight: 700;
    border: none;
    border-radius: 10px;
    font-size: 1rem;
    cursor: pointer;
    transition: var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    border: 2px solid transparent;
}

.btn-primary-modal:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-card-hover);
    background: white;
    color: var(--main-accent);
    border-color: var(--main-accent);
}

.back-link {
    color: var(--text-secondary);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.9rem;
    transition: var(--transition-fast);
}

.back-link:hover {
    color: var(--text-main);
    transform: translateX(-3px);
}

.flashcard-main-content {
    padding: 150px 1rem 1rem 1rem;
    min-height: 100vh;
    background-image: url('../assets/background-waves.webp');
    background-size: cover;
    background-position: center bottom;
    background-repeat: no-repeat;
    background-attachment: fixed;
    display: flex;
    justify-content: center;
}

[data-theme="dark"] .flashcard-main-content {
    background-image: url('../assets/background-waves-dark.webp');
}

.flashcard-container {
    width: 100%;
    max-width: 900px;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.flashcard-header-section {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

.flashcard-title-block {
    text-align: center;
}

.flashcard-title-block h1 {
    font-size: 1.5rem;
    color: var(--text-main);
    font-weight: 700;
    margin-bottom: 1rem;
}

.button-report {
    background: rgba(239, 68, 68, 0.2);
    color: var(--accent-red);
    border: 1px solid rgba(239, 68, 68, 0.5);
    padding: 0.5rem 1rem;
    border-radius: 50px;
    font-size: 0.8rem;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 600;
    transition: var(--transition-fast);
}

.button-report:hover {
    background: rgba(239, 68, 68, 0.4);
}

.button-report i {
    line-height: 1;
    transform: translateY(1px);
}

.flashcard-tabs-box {
    width: 100%;
    background: var(--card-color);
    padding: 0.75rem 1.25rem;
    border-radius: 1.5rem;
    display: flex;
    justify-content: center;
    gap: 0.625rem;
    border: 1px solid var(--card-border);
}

.tab-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    padding: 0.625rem 1.5rem;
    border-radius: 50px;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 600;
    transition: var(--transition-fast);
}

.tab-btn.active {
    background: var(--accent-yellow);
    color: var(--text-black);
}

.tab-btn:hover:not(.active) {
    background: rgba(104, 104, 104, 0.2);
    color: var(--text-main);
}

.flashcard-filters-box {
    width: 100%;
    background: var(--card-color);
    padding: 1rem 1.25rem;
    border-radius: 1.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1.25rem;
    flex-wrap: wrap;
    border: 1px solid var(--card-border);
}

.filter-label {
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 500;
}

.filter-label i {
    color: var(--accent-yellow);
}

.filter-options {
    display: flex;
    gap: 0.625rem;
    flex-wrap: wrap;
}

.filter-chip {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: transparent;
    border: 1px solid var(--card-border);
    color: var(--text-secondary);
    padding: 0.5rem 1rem;
    border-radius: 50px;
    font-size: 0.85rem;
    cursor: pointer;
}

.filter-chip input {
    accent-color: var(--accent-yellow);
}

.filter-chip.active {
    background: rgba(255, 238, 106, 0.2);
    border-color: var(--accent-yellow);
    color: var(--text-main);
}

.flashcard-progress-container {
    width: 100%;
    height: 0.5rem;
    background: var(--card-border);
    border-radius: 20px;
    overflow: hidden;
}

.flashcard-progress-bar {
    height: 100%;
    background: var(--accent-yellow);
    border-radius: 20px;
    width: 33.33%;
    transition: width 0.3s ease;
}

.scene {
    width: 100%;
    height: 600px;
    perspective: 1000px;
    position: relative;
}

.card {
    width: 100%;
    height: 100%;
    position: relative;
    transform-style: preserve-3d;
    transition: transform 0.6s cubic-bezier(0.4, 0.0, 0.2, 1);
    background: var(--card-color);
    border-radius: 24px;
    border: 1px solid var(--card-border);
    box-shadow: var(--shadow-card);
}

.card.is-flipped {
    transform: rotateY(180deg);
}

.card-face {
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    -webkit-backface-visibility: hidden;
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    overflow-y: auto;
    border-radius: 24px;
}

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

.card-face-back {
    transform: rotateY(180deg);
    background: var(--card-color);
    border: 1px solid var(--accent-yellow);
}

.scroll-content {
    flex-grow: 1;
    overflow-y: auto;
    padding-right: 0.5rem;
    margin-bottom: 0.5rem;
}

.scroll-content::-webkit-scrollbar {
    width: 0.4rem;
}

.scroll-content::-webkit-scrollbar-thumb {
    background: var(--card-border);
    border-radius: 3px;
}

.topic-tag {
    align-self: flex-start;
    padding: 0.5rem 1rem;
    border-radius: 24px;
    font-size: 0.8rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.category-parcial {
    background: var(--accent-yellow);
    color: var(--text-black);
}

.category-repaso {
    background: var(--accent-blue-light);
    color: var(--text-black);
}

.category-teoria {
    background: var(--accent-pink);
    color: var(--text-black);
}

.question-text {
    font-size: 1.05rem;
    line-height: 1.5;
    color: var(--text-main);
    margin-bottom: 1rem;
    font-weight: 500;
}

.options-list {
    list-style: none;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.options-list li {
    background: var(--card-secondary);
    border: 1px solid var(--card-border);
    padding: 0.75rem 1rem;
    border-radius: 10px;
    color: var(--text-secondary);
    font-size: 0.9rem;
    cursor: pointer;
}

.options-list li:hover {
    background: var(--card-border);
    border-color: var(--text-secondary);
    color: var(--text-main);
}

.answer-box {
    background: rgba(77, 219, 124, 0.1);
    border: 1px solid rgba(77, 219, 124, 0.3);
    color: var(--mat-accent);
    padding: 1rem;
    border-radius: 10px;
    margin-bottom: 1rem;
}

.answer-box h3 {
    font-size: 1rem;
    margin-bottom: 0.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.explanation {
    color: var(--text-main);
    line-height: 1.4;
    font-size: 0.95rem;
}

.tap-hint {
    margin-top: auto;
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.85rem;
    border-top: 1px dashed var(--card-border);
    padding-top: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--card-color);
    padding: 0.5rem 1rem;
    border-radius: 50px;
    border: 1px solid var(--card-border);
}

.button-control {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    border: none;
    background: var(--accent-yellow);
    color: var(--text-black);
    font-size: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: transform 0.2s;
}

.button-control:hover:not(:disabled) {
    transform: scale(1.1);
}

.button-control:disabled {
    background: var(--card-secondary);
    color: var(--text-secondary);
    cursor: not-allowed;
}

#counter {
    color: var(--text-main);
    font-weight: 500;
    font-size: 0.9rem;
    font-family: 'Inter', sans-serif;
}

@media (max-width: 600px) {
    .flashcard-main-content {
        padding-top: 130px;
    }

    .tab-btn {
        font-size: 0.8rem;
        padding: 0.5rem 1rem;
    }

    .flashcard-filters-box {
        padding: 1rem 1rem;
        gap: 0.5rem;
    }

    .filter-chip {
        padding: 0.4rem 0.7rem;
        border-radius: 50px;
        font-size: 0.8rem;
        cursor: pointer;
    }

    .scene {
        height: 65vh;
    }

    .card-face {
        padding: 1.125rem;
    }
}

.equation-display {
    font-family: serif;
    font-size: 1.8rem;
    text-align: center;
    padding: 1rem 0;
    font-style: italic;
    color: var(--text-main);
}

.math-result {
    font-family: serif;
    font-style: italic;
    font-size: 1.2rem;
    font-weight: 600;
}

.hint-blur-container {
    position: relative;
    background: rgba(255, 156, 7, 0.795);
    border: 1px solid rgba(255, 127, 7, 0.2);
    border-radius: 10px;
    padding: 1rem;
    margin-top: 1rem;
    cursor: pointer;
    overflow: hidden;
}

.hint-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    background: rgba(20, 20, 20, 0.65);
    color: var(--clue-accent);
    font-weight: 600;
    font-size: 0.95rem;
    z-index: 2;
    transition: opacity 0.2s ease;
    backdrop-filter: blur(4px);
}

.hint-blur-container:hover .hint-overlay {
    background: rgba(20, 20, 20, 0.6);
}

.hint-content {
    color: var(--clue-accent);
    font-size: 0.95rem;
    filter: blur(5px);
    transition: filter 0.2s ease;
    user-select: none;
}

.hint-blur-container.revealed .hint-overlay {
    opacity: 0;
    pointer-events: none;
}

.hint-blur-container.revealed .hint-content {
    filter: blur(0);
    user-select: text;
}

.hint-blur-container.revealed {
    cursor: default;
    background: rgba(255, 143, 38, 0.2);
}

.solution-steps {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.solution-steps p {
    margin: 0;
    font-size: 0.95rem;
    color: var(--text-secondary);
}

.solution-steps em {
    color: var(--text-main);
    font-style: italic;
    font-family: serif;
}

.code-frame {
    background: var(--code-bg);
    border-left: 3px solid var(--blue-accent);
    border-radius: 10px;
    padding: 1rem;
    margin-bottom: 1rem;
    overflow-x: auto;
    border: 1px solid var(--card-border);
    border-left-width: 0.2rem;
}

.code-frame .code-block {
    font-family: monospace;
    font-size: 0.85rem;
    line-height: 1.6;
    color: var(--code-text);
    margin: 0;
}