/* Global Styles */
*,
*::before,
*::after {
    box-sizing: border-box;
}

:root {
    --error-color: #FF6B6B;
    --success-color: #51CF66;
    --warning-color: #FFD93D;
    --primary-color: #7F5AF0;
    --primary-light: #A78BFA;
    --transition: all 0.15s ease;
}

/* Dark Mode */
body.dark-mode {
    --background-color: #1F2023;
    --text-color: #EAEAEA;
    --menu-background-color: #2D2E32;
    --menu-text-color: #F5F3FF;
    --card-background: #252629;
    --border-color: #3E3F47;
    --input-background: #1a1a1e;
    --input-border: #404048;
    --hero-stat-color: #A78BFA;
}

/* Light Mode */
body.light-mode {
    --background-color: #F8F9FA;
    --text-color: #1a1a1a;
    --menu-background-color: #7F5AF0;
    --menu-text-color: #F5F3FF;
    --card-background: #FFFFFF;
    --border-color: #E0E0E0;
    --input-background: #FFFFFF;
    --input-border: #D0D0D0;
    --hero-stat-color: #FFFFFF;
}

/* Body */
body {
    visibility: hidden;
    color: var(--text-color);
    background: linear-gradient(135deg, rgba(127, 90, 240, 0.1) 0%, rgba(167, 139, 250, 0.05) 100%), var(--background-color);
    background-attachment: fixed;
    display: flex;
    flex-direction: column;
    padding: 0;
    margin: 0;
    min-height: 100vh;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    line-height: 1.6;
}

/* Header & Footer */
header {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-light) 100%);
    color: var(--menu-text-color);
    padding: 0;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.15);
    position: sticky;
    top: 0;
    z-index: 100;
}

footer {
    margin-top: auto;
    width: 100%;
    padding: 20px 15px;
    background-color: var(--menu-background-color);
    color: var(--menu-text-color);
    text-align: center;
    border-top: 1px solid var(--border-color);
    font-size: 0.9rem;
}

.menu-item {
    color: var(--menu-text-color);
}

/* Navigation */
nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
    padding: 15px 20px;
    flex-wrap: wrap;
    position: relative;
}

.nav-wrapper {
    display: flex;
    width: 100%;
    justify-content: space-between;
    align-items: center;
}

.nav-left,
.nav-right {
    display: flex;
}

.nav-left ul,
.nav-right ul {
    list-style-type: none;
    margin: 0;
    padding: 0;
    display: flex;
    gap: 25px;
    flex-wrap: wrap;
}

nav > ul > li > a,
.nav-left ul > li > a,
.nav-right ul > li > a {
    color: var(--menu-text-color);
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
    position: relative;
    padding-bottom: 5px;
}

nav > ul > li > a::after,
.nav-left ul > li > a::after,
.nav-right ul > li > a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--menu-text-color);
    transition: var(--transition);
}

nav > ul > li > a:hover::after,
.nav-left ul > li > a:hover::after,
.nav-right ul > li > a:hover::after {
    width: 100%;
}

/* Hamburger Menu */
.hamburger {
    display: none;
    flex-direction: column;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px 10px;
    box-shadow: none;
    gap: 6px;
}

.hamburger span {
    width: 25px;
    height: 3px;
    background-color: var(--menu-text-color);
    border-radius: 2px;
    transition: var(--transition);
}

.hamburger.active span:nth-child(1) {
    transform: rotate(45deg) translate(8px, 8px);
}

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

.hamburger.active span:nth-child(3) {
    transform: rotate(-45deg) translate(8px, -8px);
}

/* Mobile Menu */
.mobile-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-light) 100%);
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.15);
}

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

.mobile-menu ul {
    list-style-type: none;
    margin: 0;
    padding: 15px 20px;
    display: flex;
    flex-direction: column;
    gap: 15px;
    width: 100%;
}

.mobile-menu ul li a {
    color: var(--menu-text-color);
    text-decoration: none;
    font-weight: 600;
    display: block;
    padding: 10px;
}

a {
    cursor: pointer;
    color: var(--primary-light);
    text-decoration: none;
    transition: var(--transition);
}

a:hover {
    color: var(--menu-text-color);
}

/* Main Sections */
main {
    flex: 1;
}

#create-set,
#edit-set,
#learning-setup,
#learn {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 20px;
}

/* Forms & Set Management */
.set-management {
    background-color: var(--card-background);
    color: var(--text-color);
    padding: 30px;
    border-radius: 12px;
    width: 100%;
    max-width: 700px;
    margin-top: 20px;
    display: flex;
    flex-direction: column;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    border: 1px solid var(--border-color);
}

.set-management h1,
.set-management h2,
.set-management h3 {
    margin-top: 0;
    color: var(--text-color);
    margin-bottom: 20px;
}

.set-management h1 {
    font-size: 1.8rem;
}

.set-management h2 {
    font-size: 1.8rem;
}

.set-management h3 {
    font-size: 1.2rem;
}

.input-container {
    display: flex;
    flex-direction: row;
    gap: 20px;
    flex-wrap: wrap;
}

.labeled-input {
    display: flex;
    flex-direction: column;
    padding-bottom: 20px;
    flex: 1;
    min-width: 250px;
}

.labeled-input label {
    margin-bottom: 8px;
    font-weight: 600;
    color: var(--text-color);
    font-size: 0.95rem;
}

.labeled-text-input {
    display: flex;
    flex-direction: column;
    flex: 1;
    min-width: 200px;
}

.labeled-text-input label {
    margin-bottom: 8px;
    font-weight: 600;
    color: var(--text-color);
    font-size: 0.95rem;
}

.labeled-text-input input {
    padding: 12px 15px;
    border: 2px solid var(--input-border);
    border-radius: 8px;
    background-color: var(--input-background);
    color: var(--text-color);
    font-family: inherit;
    font-size: 1rem;
    transition: var(--transition);
    width: 100%;
}

.labeled-text-input input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(127, 90, 240, 0.1);
}

textarea,
select {
    padding: 12px 15px;
    border: 2px solid var(--input-border);
    border-radius: 8px;
    background-color: var(--input-background);
    color: var(--text-color);
    font-family: inherit;
    font-size: 1rem;
    transition: var(--transition);
}

textarea:focus,
select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(127, 90, 240, 0.1);
}

.input-text {
    padding: 12px 15px;
    border: 2px solid var(--input-border);
    border-radius: 8px;
    background-color: var(--input-background);
    color: var(--text-color);
    font-family: inherit;
    font-size: 16px; /* Prevents zoom on iOS */
    transition: var(--transition);
}

.input-text:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(127, 90, 240, 0.1);
}

textarea {
    resize: vertical;
    min-height: 100px;
}

/* Toggle Switch Style for Checkboxes */
.toggle {
    appearance: none;
    -webkit-appearance: none;
    width: 50px;
    height: 28px;
    background-color: var(--input-border);
    border: none;
    border-radius: 14px;
    cursor: pointer;
    position: relative;
    transition: var(--transition);
    margin-left: 10px;
}

.toggle::before {
    content: '';
    position: absolute;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background-color: white;
    top: 2px;
    left: 2px;
    transition: var(--transition);
}

.toggle:checked {
    background-color: var(--primary-color);
}

.toggle:checked::before {
    left: 24px;
}

/* Layout for checkbox with label */
.labeled-input-toggle {
    flex-direction: row;
    align-items: center;
    gap: 10px;
    padding-bottom: 0;
}

.labeled-input-toggle label {
    margin-bottom: 0;
}

/* Form Styles */
.create-set-form,
.edit-set-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
    width: 100%;
}

#learning-setup-form .labeled-input {
    margin-bottom: 15px;
    padding-bottom: 0;
}

.form-buttons-add {
    display: flex;
    gap: 15px;
    flex-wrap: wrap;
    align-items: center;
    margin-top: 10px;
}

.form-buttons-manage {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
    align-items: center;
    margin-top: 15px;
}

.form-buttons-add button,
.form-buttons-manage button {
    flex: 1;
    min-width: 140px;
    padding: 12px 24px;
}

#set-name,
#set-description {
    width: 100%;
}

/* Tables */
.set-management > table {
    width: 100%;
    border-collapse: collapse;
    margin: 20px 0;
    table-layout: fixed;
}

.set-management > table th {
    text-align: left;
    padding: 10px;
    border-bottom: 2px solid var(--border-color);
    font-weight: 600;
    background-color: var(--menu-background-color);
    color: var(--menu-text-color);
}

.set-management > table td {
    padding: 10px;
    border-bottom: 1px solid var(--border-color);
    word-wrap: break-word;
    overflow-wrap: break-word;
}

.set-management > table tr:hover {
    background-color: var(--menu-background-color);
}

.term-editing-buttons-container {
    display: flex;
    gap: 6px;
    flex-wrap: wrap;
    width: 100%;
}

.term-editing-buttons-container button {
    flex: 1;
    min-width: 70px;
    padding: 6px 10px;
    font-size: 0.85rem;
}

/* Star checkbox styling */
.is-starred-checkbox {
    appearance: none;
    -webkit-appearance: none;
    width: 40px;
    height: 40px;
    cursor: pointer;
    background: var(--input-background);
    border: 2px solid var(--border-color);
    border-radius: 8px;
    transition: var(--transition);
    position: relative;
    padding: 0;
    font-size: 0;
}

.is-starred-checkbox:hover {
    border-color: var(--primary-color);
    background-color: rgba(127, 90, 240, 0.08);
    box-shadow: 0 0 8px rgba(127, 90, 240, 0.2);
}

.is-starred-checkbox:checked {
    border-color: var(--warning-color);
    background-color: rgba(255, 217, 61, 0.15);
    box-shadow: 0 0 8px rgba(255, 217, 61, 0.3);
}

.is-starred-checkbox::before {
    content: '★';
    position: absolute;
    font-size: 20px;
    color: var(--border-color);
    transition: var(--transition);
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

.is-starred-checkbox:checked::before {
    color: var(--warning-color);
    text-shadow: 0 0 8px rgba(255, 217, 61, 0.5);
}

.is-starred-checkbox:active {
    transform: scale(0.95);
}

/* Edit term row styling */
.term-editing-row td {
    padding: 6px 8px;
    vertical-align: middle;
}

.term-editing-row .input-text {
    padding: 6px 8px;
    font-size: 0.9rem;
    border: 1px solid var(--input-border);
    width: 100%;
    max-width: 150px;
}

.term-editing-row button {
    padding: 6px 10px;
    font-size: 0.9rem;
    width: 70px;
    margin: 2px 2px;
    box-shadow: none;
}

.term-editing-row button:hover {
    box-shadow: 0 2px 6px rgba(127, 90, 240, 0.2);
}

/* Buttons */
button {
    padding: 12px 24px;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 8px;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: 0 2px 8px rgba(127, 90, 240, 0.2);
}

button:hover {
    background-color: var(--primary-light);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(127, 90, 240, 0.3);
}

button:active {
    transform: translateY(0);
}

/* Button Variants */
.edit-set-form #save-set {
    background-color: var(--primary-color);
}

.edit-set-form #save-set:hover {
    background-color: var(--primary-light);
    box-shadow: 0 4px 12px rgba(127, 90, 240, 0.3);
}

.edit-set-form #remove-set,
.delete-term {
    background-color: var(--error-color);
}

.edit-set-form #remove-set:hover,
.delete-term:hover {
    background-color: #E55555;
    box-shadow: 0 4px 12px rgba(255, 107, 107, 0.3);
}

.skip-button,
.I-was-right {
    background-color: var(--warning-color);
    color: #000;
}

.skip-button:hover,
.I-was-right:hover {
    background-color: #FFC700;
}

.submit-button {
    background-color: var(--primary-color);
}

.submit-button:hover {
    background-color: var(--primary-light);
}

/* Tiles Container */
.tile-container {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 25px;
    padding: 30px 20px;
    flex: 1;
}

.set-tile {
    flex: 0 1 300px;
    background-color: var(--card-background);
    color: var(--text-color);
    border-radius: 12px;
    padding: 25px;
    cursor: pointer;
    border: 2px solid transparent;
    transition: var(--transition);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    display: flex;
    flex-direction: column;
}

.set-tile:hover {
    transform: translateY(-5px);
    border-color: var(--primary-color);
    box-shadow: 0 8px 20px rgba(127, 90, 240, 0.2);
}

.set-tile h2 {
    margin: 0 0 15px 0;
    font-size: 1.3rem;
    color: var(--text-color);
}

.set-tile p {
    margin: 8px 0;
    color: var(--text-color);
    opacity: 0.8;
}

.set-tile .learn-button {
    margin-top: auto;
    margin-bottom: 0;
}

/* Links in Management */
.set-management a {
    text-decoration: none;
    color: var(--primary-light);
    transition: var(--transition);
}

.set-management a:hover {
    text-decoration: underline;
    color: var(--menu-text-color);
}

/* Progress & Stats */
.progress {
    display: flex;
    flex-direction: row;
    gap: 20px;
    flex-wrap: wrap;
    margin: 20px 0;
    padding: 15px;
    background-color: var(--menu-background-color);
    border-radius: 8px;
}

.progress p {
    margin: 0;
    color: var(--menu-text-color);
    font-weight: 500;
}

/* Button Groups */
.question-buttons,
.wrong-answer-buttons,
.single-submit-button-container {
    display: flex;
    flex-direction: row;
    gap: 15px;
    margin-top: 20px;
    flex-wrap: wrap;
}

.question-buttons {
    justify-content: flex-end;
}

.wrong-answer-buttons {
    justify-content: space-between;
}

.single-submit-button-container {
    justify-content: flex-end;
}

/* Learn Section */
.learn-form {
    margin-top: 20px;
}

.question-content {
    font-size: 1.5rem;
    color: var(--text-color);
    margin: 0 0 20px;
}

.correct-answer,
.user-answer {
    padding: 15px;
    background-color: var(--menu-background-color);
    color: var(--menu-text-color);
    border-radius: 8px;
    margin: 15px 0;
    font-weight: 500;
}

.correct-answer {
    background-color: rgba(81, 207, 102, 0.1);
    color: var(--success-color);
    border-left: 4px solid var(--success-color);
}

.user-answer {
    background-color: rgba(255, 107, 107, 0.1);
    color: var(--error-color);
    border-left: 4px solid var(--error-color);
}

.congratulation-message {
    padding: 15px;
    background-color: rgba(81, 207, 102, 0.1);
    color: var(--success-color);
    border-radius: 8px;
    text-align: center;
    font-size: 1.1rem;
    font-weight: 600;
    margin: 15px 0;
}

/* Hero Section Styles */
.hero-section {
    padding: 60px 20px;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

.hero-content {
    max-width: 1200px;
    width: 100%;
}

.hero-section h1 {
    font-size: 3.5rem;
    font-weight: 900;
    color: var(--primary-color);
    margin: 0 0 20px 0;
    text-align: center;
    line-height: 1.2;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-light) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-tagline {
    font-size: 1.3rem;
    color: var(--text-color);
    text-align: center;
    margin: 0 0 40px 0;
    opacity: 0.9;
}

.hero-buttons {
    display: flex;
    gap: 20px;
    justify-content: center;
    margin-bottom: 60px;
    flex-wrap: wrap;
}

.hero-btn {
    padding: 15px 40px;
    font-size: 1.1rem;
    font-weight: 700;
    border-radius: 8px;
    text-decoration: none;
    transition: var(--transition);
    display: inline-block;
    cursor: pointer;
    border: none;
}

.hero-btn-primary {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-light) 100%);
    color: white;
    box-shadow: 0 4px 15px rgba(127, 90, 240, 0.3);
}

.hero-btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(127, 90, 240, 0.4);
}

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

.hero-btn-secondary:hover {
    background-color: var(--primary-color);
    color: white;
    transform: translateY(-3px);
}

.hero-btn-large {
    padding: 18px 50px;
    font-size: 1.2rem;
}

/* Features Section */
.hero-features {
    margin: 80px 0;
}

.hero-features h2 {
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: 50px;
    color: var(--text-color);
}

.hero-features-list {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 30px;
}

.hero-feature-card {
    flex: 0 1 250px;
    background-color: var(--card-background);
    padding: 40px 30px;
    border-radius: 12px;
    border: 2px solid transparent;
    transition: var(--transition);
    text-align: center;
    box-shadow: 0 2px 15px rgba(0, 0, 0, 0.1);
}

.hero-feature-card:hover {
    border-color: var(--primary-color);
    transform: translateY(-8px);
    box-shadow: 0 8px 25px rgba(127, 90, 240, 0.2);
}

.hero-feature-icon {
    font-size: 3rem;
    display: block;
    margin-bottom: 20px;
}

.hero-feature-card h3 {
    font-size: 1.3rem;
    color: var(--text-color);
    margin: 15px 0;
}

.hero-feature-card p {
    color: var(--text-color);
    opacity: 0.8;
    line-height: 1.6;
}

/* Stats Section */
.hero-stats {
    margin: 80px 0;
    background-color: var(--menu-background-color);
    padding: 60px 40px;
    border-radius: 12px;
}

.hero-stats h2 {
    font-size: 2.5rem;
    text-align: center;
    color: var(--menu-text-color);
    margin-bottom: 50px;
}

.hero-stats-list {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 40px;
}

.hero-stat {
    flex: 0 1 250px;
    text-align: center;
}

.hero-stat h4 {
    font-size: 2.5rem;
    color: var(--hero-stat-color);
    margin: 0 0 15px 0;
    font-weight: 900;
}

.hero-stat p {
    color: var(--menu-text-color);
    font-size: 1.1rem;
    opacity: 0.9;
}

/* Testimonials Section */
.hero-testimonials {
    margin: 80px 0;
}

.hero-testimonials h2 {
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: 50px;
    color: var(--text-color);
}

.hero-testimonials-list {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 30px;
}

.hero-testimonial {
    flex: 0 1 calc(33.333% - 20px);
    min-width: 280px;
    background-color: var(--card-background);
    padding: 30px;
    border-radius: 12px;
    border-left: 4px solid var(--primary-color);
    box-shadow: 0 2px 15px rgba(0, 0, 0, 0.1);
    transition: var(--transition);
}

.hero-testimonial:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(127, 90, 240, 0.2);
}

.hero-testimonial p {
    color: var(--text-color);
    margin: 0;
    line-height: 1.7;
}

/* CTA Final Section */
.hero-cta-final {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-light) 100%);
    padding: 60px 40px;
    border-radius: 12px;
    text-align: center;
    margin: 80px 0 0 0;
    color: white;
}

.hero-cta-final h2 {
    font-size: 2.2rem;
    color: white;
    margin: 0 0 20px 0;
}

.hero-cta-final p {
    font-size: 1.1rem;
    color: rgba(255, 255, 255, 0.95);
    margin: 0 0 30px 0;
}

.hero-cta-final .hero-btn-large {
    background-color: white;
    color: var(--primary-color);
    font-weight: 700;
}

.hero-cta-final .hero-btn-large:hover {
    background-color: rgba(255, 255, 255, 0.9);
    transform: translateY(-3px);
}

/* Responsiveness */
@media (max-width: 768px) {
    .hamburger {
        display: flex;
    }

    .nav-wrapper {
        display: none;
    }

    nav {
        padding: 12px 15px;
        position: relative;
    }

    .mobile-menu ul > li > a {
        transition: var(--transition);
        padding: 12px;
    }

    .mobile-menu ul > li > a:hover {
        background-color: rgba(255, 255, 255, 0.1);
        border-radius: 6px;
    }

    nav > ul {
        gap: 15px;
        font-size: 0.95rem;
    }

    main {
        padding: 10px;
    }

    #create-set,
    #edit-set,
    #learning-setup,
    #learn {
        padding: 15px;
    }

    .set-management {
        max-width: 100%;
        padding: 20px;
        margin-top: 15px;
    }

    .set-management h1,
    .set-management h2 {
        font-size: 1.4rem;
    }

    .input-container {
        flex-direction: column;
        gap: 15px;
    }

    .labeled-input {
        min-width: 100%;
        padding-bottom: 0;
    }

    .labeled-text-input {
        min-width: 100%;
    }

    .tile-container {
        gap: 20px;
        padding: 20px 15px;
    }

    .set-tile {
        flex: 0 1 250px;
    }

    .set-tile {
        padding: 20px;
    }

    .set-tile h2 {
        font-size: 1.1rem;
    }

    .progress {
        flex-direction: column;
        gap: 10px;
    }

    .question-buttons,
    .wrong-answer-buttons,
    .single-submit-button-container {
        flex-direction: column;
    }

    .question-buttons {
        justify-content: stretch;
    }

    button {
        padding: 12px 16px;
        font-size: 0.95rem;
    }

    .question-content {
        font-size: 1.2rem;
    }

    .correct-answer,
    .user-answer {
        font-size: 0.95rem;
    }

    .set-management > table {
        table-layout: auto;
    }

    .form-buttons-manage {
        flex-direction: column;
        gap: 10px;
    }

    .toggle {
        width: 45px;
        height: 26px;
    }

    .toggle::before {
        width: 22px;
        height: 22px;
        left: 2px;
    }

    .toggle:checked::before {
        left: 21px;
    }

    .is-starred-checkbox {
        width: 36px;
        height: 36px;
    }

    .is-starred-checkbox::before {
        font-size: 18px;
    }

    .hero-section {
        padding: 40px 20px;
    }

    .hero-section h1 {
        font-size: 2.5rem;
    }

    .hero-tagline {
        font-size: 1.1rem;
    }

    .hero-buttons {
        flex-direction: column;
        gap: 15px;
    }

    .hero-btn {
        width: 100%;
    }

    .hero-features h2,
    .hero-stats h2,
    .hero-testimonials h2,
    .hero-cta-final h2 {
        font-size: 1.8rem;
    }

    .hero-feature-card,
    .hero-stat,
    .hero-testimonial {
        flex: 0 1 calc(50% - 10px);
        min-width: 200px;
    }

    .hero-stats {
        padding: 40px 20px;
    }

    .hero-cta-final {
        padding: 40px 20px;
    }
}

@media (max-width: 480px) {
    nav {
        flex-direction: column;
        padding: 10px;
    }

    nav > ul {
        justify-content: center;
        gap: 10px;
        width: 100%;
    }

    #create-set,
    #edit-set,
    #learning-setup,
    #learn {
        padding: 10px;
    }

    .set-management {
        padding: 15px;
    }

    .set-management h1,
    .set-management h2 {
        font-size: 1.2rem;
    }

    .tile-container {
        gap: 15px;
        padding: 15px 10px;
    }

    .set-tile {
        flex: 0 1 100%;
    }

    .set-tile {
        padding: 15px;
    }

    button {
        padding: 10px 14px;
        font-size: 0.9rem;
    }

    .progress {
        font-size: 0.9rem;
    }

    .question-content {
        font-size: 1rem;
    }


    .question-buttons,
    .wrong-answer-buttons {
        gap: 10px;
    }

    .toggle {
        width: 45px;
        height: 26px;
    }

    .toggle::before {
        width: 22px;
        height: 22px;
        left: 2px;
    }

    .toggle:checked::before {
        left: 21px;
    }

    .is-starred-checkbox {
        width: 36px;
        height: 36px;
    }

    .is-starred-checkbox::before {
        font-size: 18px;
    }

    .set-management > table {
        table-layout: auto;
        font-size: 0.85rem;
    }

    .set-management > table th,
    .set-management > table td {
        padding: 8px;
    }

    .term-editing-buttons-container button {
        min-width: 60px;
        padding: 6px 10px;
        font-size: 0.8rem;
    }

    .form-buttons-add {
        flex-direction: column;
        gap: 10px;
    }

    .form-buttons-add button {
        width: 100%;
        min-width: auto;
    }

    .form-buttons-manage button {
        width: 100%;
        min-width: auto;
    }

    .hero-section {
        padding: 30px 15px;
    }

    .hero-section h1 {
        font-size: 2rem;
    }

    .hero-tagline {
        font-size: 0.95rem;
    }

    .hero-btn {
        padding: 12px 30px;
        font-size: 1rem;
    }

    .hero-btn-large {
        padding: 14px 35px;
        font-size: 1rem;
    }

    .hero-features h2,
    .hero-stats h2,
    .hero-testimonials h2,
    .hero-cta-final h2 {
        font-size: 1.5rem;
    }

    .hero-feature-icon {
        font-size: 2.5rem;
    }

    .hero-stat h4 {
        font-size: 2rem;
    }

    .hero-feature-card,
    .hero-stat,
    .hero-testimonial {
        flex: 0 1 100%;
        min-width: auto;
    }

    .hero-stats,
    .hero-cta-final {
        padding: 30px 15px;
        margin: 60px 0 0 0;
    }
}