:root {
    /* Swiss Style Design System */
    --color-primary: #7DA78C;
    --color-primary-dark: #5f8f7a;
    --color-accent: #D8CAD4;
    --color-selected: #35858E;
    
    --color-bg: #f4f4f2; /* Off-white paper tone */
    --color-surface: #FFFFFF;
    --color-surface-hover: #F8F9FA;
    
    --color-text-main: #1A1A1A;
    --color-text-muted: #555555;
    --color-text-inv: #FFFFFF;
    
    --color-border: #EAEAEA;

    --color-success-bg: rgba(194, 208, 153, 0.15);
    --color-success-border: #C2D099;
    --color-error-bg: rgba(255, 131, 131, 0.1);
    --color-error-border: #FF8383;

    /* Single font family — Swiss Style */
    --font-heading: 'Inter', -apple-system, BlinkMacSystemFont, "Helvetica Neue", Arial, sans-serif;
    --font-body: 'Inter', -apple-system, BlinkMacSystemFont, "Helvetica Neue", Arial, sans-serif;

    --border-radius-sm: 4px;
    --border-radius-md: 12px;
    --border-radius-lg: 16px;
}

/* Visually hidden but readable by Google */
.seo-h1 {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0,0,0,0);
    white-space: nowrap;
    border: 0;
}

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

body {
    font-family: var(--font-body);
    background-color: var(--color-bg);
    color: var(--color-text-main);
    display: flex;
    justify-content: center;
    min-height: 100vh;
    overflow-x: hidden;
    padding: 0; 
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Hide dark theme blob animations */
.alpine-background {
    display: none;
}

#app-container {
    width: 100%;
    margin: 0 auto;
    background-color: transparent; 
    position: relative;
    z-index: 2;
    display: flex;
    flex-direction: column;
    min-height: 100vh; 
}

.view { display: none; flex-direction: column; }
.view.active { display: flex; }
#landing-view.active { min-height: 100vh; }

h1 { font-family: var(--font-heading); font-size: clamp(2rem, 5vw, 4rem); font-weight: 800; letter-spacing: -0.05em; line-height: 1.1; margin-bottom: 20px; color: var(--color-text-main); }
h2 { font-family: var(--font-heading); font-size: clamp(1.5rem, 3.5vw, 2.2rem); font-weight: 700; letter-spacing: -0.03em; margin-bottom: 20px;}
h3 { font-family: var(--font-heading); font-size: clamp(1.2rem, 2.5vw, 1.5rem); font-weight: 600; letter-spacing: -0.02em; margin-bottom: 20px; }
p { font-size: 1.1rem; line-height: 1.6; color: var(--color-text-muted); }

.outline-text {
    color: var(--color-primary);
    -webkit-text-stroke: 0; /* Removing stroke since it's on white bg */
    font-style: normal;
}

.btn {
    font-family: var(--font-heading);
    font-weight: 600;
    padding: 14px 28px;
    border: none;
    cursor: pointer;
    border-radius: 50px;
    user-select: none;
    outline: none;
    font-size: 1rem;
    color: var(--color-text-inv);
    min-height: 44px;
}

.btn-primary { background-color: var(--color-text-main); }
.btn-primary:hover { background-color: #000000; box-shadow: 0 4px 10px rgba(0,0,0,0.15); }

.btn-selected { background-color: #35858E; color: #fff; }
.btn-selected:hover { background-color: #2d7279; box-shadow: 0 4px 10px rgba(53,133,142,0.25); }

.btn-gradient {
    background: var(--color-primary);
    color: #fff;
}
.btn-gradient:hover {
    background: var(--color-primary-dark);
    box-shadow: 0 2px 8px rgba(0,0,0,0.12);
    transform: translateY(-1px);
}

.btn-gradient-success {
    background: var(--color-success-border);
    color: var(--color-text-main);
}
.btn-gradient-success:hover {
    background: #a8b882;
    box-shadow: 0 2px 8px rgba(0,0,0,0.12);
    transform: translateY(-1px);
}

.glass-panel {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-md);
    padding: 30px;
    box-shadow: 0 8px 30px rgba(0,0,0,0.06);
}

/* Subpage layout */
.subpage-article {
    max-width: 680px;
    margin: 0 auto;
    padding: 60px 40px 100px;
}
.subpage-label {
    font-family: var(--font-body);
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--color-text-muted);
    margin-bottom: 16px;
}
.subpage-title {
    font-family: var(--font-heading);
    font-size: clamp(2.2rem, 6vw, 3.8rem);
    font-weight: 800;
    letter-spacing: -0.04em;
    line-height: 1.0;
    color: var(--color-text-main);
    margin-bottom: 40px;
}
.subpage-body {
    font-family: var(--font-body);
    font-size: 1rem;
    line-height: 1.8;
    color: var(--color-text-muted);
    font-weight: 400;
}
.subpage-body p { margin-bottom: 16px; }
.subpage-body a { color: var(--color-text-main); font-weight: 600; }
.subpage-body a:hover { color: var(--color-primary); }
.subpage-body code {
    font-family: monospace;
    font-size: 0.9em;
    background: var(--color-border);
    padding: 1px 5px;
    border-radius: 3px;
    color: var(--color-text-main);
}
.subpage-body h3 {
    font-family: var(--font-body);
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--color-text-main);
    margin: 36px 0 10px;
}
.subpage-back {
    display: inline-block;
    margin-top: 48px;
    font-family: var(--font-body);
    font-size: 0.8rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--color-text-muted);
    background: none;
    border: none;
    padding: 0;
    cursor: pointer;
}
.subpage-back:hover { color: var(--color-text-main); }
@media (max-width: 600px) {
    .subpage-article { padding: 40px 20px 80px; }
}

.landing-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 30px 5vw;
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
}

.logo {
    display: flex;
    align-items: center;
    font-family: var(--font-heading);
    color: var(--color-text-main); 
    font-size: 1.6rem;
    font-weight: 800;
    text-decoration: none;
    letter-spacing: -0.5px;
    gap: 0;
}

.nav-logo-mark {
    width: 22px;
    height: 22px;
    flex-shrink: 0;
}

.nav-logo-mark--small {
    width: 16px;
    height: 16px;
    vertical-align: -2px;
    margin-left: 4px;
}

.top-nav-links {
    display: flex;
    gap: 30px;
}

.top-nav-links a {
    color: var(--color-text-main);
    text-decoration: none;
    font-size: 1.05rem;
    font-weight: 700;
    font-family: var(--font-heading);
    transition: color 0.2s;
}

.top-nav-links a:hover {
    color: var(--color-primary);
}

.hero-section {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 80px 5vw;
    max-width: 1200px;
    margin: 0 auto;
    flex-wrap: wrap; 
    gap: 40px;
}

/* Centered hero for landing page */
.hero-centered {
    justify-content: center;
    align-items: center;
    text-align: center;
    flex-direction: column;
    min-height: unset;
    flex: 1;
    padding: 20px 5vw 16px;
}

.hero-centered h1 {
    font-size: clamp(3.8rem, 13.5vw, 5rem);
    line-height: 0.95;
    margin-bottom: 28px;
}

.welcome-b {
    max-width: 480px;
    margin: 0 auto 16px;
    text-align: center;
}
.welcome-b-heading {
    font-family: var(--font-heading);
    font-weight: 800;
    font-size: clamp(1.6rem, 4.5vw, 2.2rem);
    letter-spacing: -0.03em;
    color: var(--color-text-main);
    margin-bottom: 12px;
}
.welcome-b-rule {
    border: none;
    border-top: 1.5px solid var(--color-border);
    margin: 0 auto 12px;
    width: 60px;
}
.welcome-b-body {
    font-family: var(--font-body);
    font-size: clamp(1rem, 3vw, 1.15rem);
    font-weight: 400;
    color: var(--color-text-muted);
    line-height: 1.6;
    margin-bottom: 12px;
}
.welcome-b-badge {
    display: inline-block;
    font-family: var(--font-body);
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--color-text-muted);
    border: 1.5px solid var(--color-border);
    border-radius: 999px;
    padding: 4px 14px;
}
.hero-privacy {
    font-family: var(--font-body);
    font-size: 0.62rem;
    font-weight: 400;
    color: var(--color-text-muted);
    line-height: 1.5;
    text-align: center;
    padding: 8px 5vw;
    margin: 0;
}
@media (max-width: 600px) {
    .hero-privacy {
        max-width: 280px;
        margin: 0 auto;
    }
}

.hero-centered .subtitle {
    color: var(--color-text-muted);
    font-weight: 400;
    font-family: var(--font-body);
    font-size: clamp(0.9rem, 1.8vw, 1.15rem);
    margin-bottom: 24px;
}

/* Welcome text in hero — no box, plain type */
.welcome-card {
    max-width: 520px;
    margin: 0 auto 24px;
    text-align: center;
}
.welcome-allegra {
    font-family: var(--font-heading);
    font-weight: 800;
    font-size: clamp(1.2rem, 2.5vw, 1.6rem);
    letter-spacing: -0.03em;
    color: var(--color-text-main);
    margin-bottom: 8px;
}
.welcome-body {
    font-family: var(--font-body);
    font-size: clamp(0.9rem, 1.8vw, 1.15rem);
    font-weight: 400;
    line-height: 1.6;
    color: var(--color-text-muted);
    margin-bottom: 6px;
}
.welcome-note {
    font-family: var(--font-body);
    font-size: clamp(0.9rem, 1.8vw, 1.15rem);
    font-weight: 400;
    color: var(--color-text-muted);
    line-height: 1.6;
}

/* Black footer bar */
.landing-footer {
    background: #fff;
    border-top: 1px solid var(--color-border);
    margin-top: auto;
    padding: 28px 5vw;
}
.landing-footer-inner {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
}
.landing-footer-logo {
    font-family: var(--font-heading);
    font-weight: 800;
    font-size: 1.6rem;
    color: var(--color-text-main);
    letter-spacing: -0.5px;
}
.landing-footer-links {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 10px 24px;
}
.landing-footer-links a {
    color: var(--color-text-muted);
    text-decoration: none;
    font-family: var(--font-body);
    font-size: 0.78rem;
    font-weight: 600;
    letter-spacing: 0.04em;
    transition: color 0.2s;
    white-space: nowrap;
}
.landing-footer-links a:hover {
    color: var(--color-text-main);
}
.footer-mehr-links {
    display: contents;
}
.footer-mehr-links[hidden] {
    display: none !important;
}
.footer-mehr-btn {
    background: none;
    border: none;
    font-family: var(--font-body);
    font-size: 0.78rem;
    font-weight: 700;
    color: var(--color-text-main);
    cursor: pointer;
    padding: 0;
    letter-spacing: 0.04em;
    white-space: nowrap;
}
@media (min-width: 601px) {
    .footer-mehr-btn { display: none; }
    .footer-mehr-links { display: contents !important; }
}

.hero-cta {
    font-size: 1.2rem;
    padding: 18px 48px;
    border-radius: 12px;
}

.hero-content {
    flex: 1;
    min-width: 280px;
}

.hero-content .subtitle { color: var(--color-text-muted); font-weight: 600; font-size: 1.2rem; }

.search-panel {
    width: 100%;
    max-width: 400px;
    padding: 40px;
}

.search-box {
    display: flex;
    align-items: center;
    background: var(--color-surface);
    border: 1px solid var(--color-text-main);
    border-radius: 50px;
    padding: 5px 20px;
}

.search-box input {
    flex: 1;
    background: transparent;
    border: none;
    color: var(--color-text-main);
    padding: 12px 0;
    font-size: 1rem;
    outline: none;
}

.search-box input::placeholder {
    color: var(--color-text-muted);
}

.search-icon {
    font-size: 1.2rem;
    cursor: pointer;
    color: var(--color-text-main);
}

.form-panel {
    max-width: 1120px;
    margin: 40px auto;
    padding: 40px 50px;
    display: flex;
    flex-direction: column;
}

.form-row {
    display: flex;
    gap: 20px;
}

.form-row input,
.form-row select {
    flex: 1;
    background: #FFFFFF;
    border: 1px solid var(--color-border);
    border-radius: 50px;
    padding: 15px 25px;
    color: var(--color-text-main);
    font-size: 1rem;
    outline: none;
    transition: border-color 0.2s;
}

.form-row select {
    appearance: none;
    -webkit-appearance: none;
    background-image: url("data:image/svg+xml;charset=US-ASCII,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20width%3D%22292.4%22%20height%3D%22292.4%22%3E%3Cpath%20fill%3D%22%231A1A1A%22%20d%3D%22M287%2069.4a17.6%2017.6%200%200%200-13-5.4H18.4c-5%200-9.3%201.8-12.9%205.4A17.6%2017.6%200%200%200%200%2082.2c0%205%201.8%209.3%205.4%2012.9l128%20127.9c3.6%203.6%207.8%205.4%2012.8%205.4s9.2-1.8%2012.8-5.4L287%2095c3.5-3.5%205.4-7.8%205.4-12.8%200-5-1.9-9.2-5.5-12.8z%22%2F%3E%3C%2Fsvg%3E");
    background-repeat: no-repeat;
    background-position: right 20px top 50%;
    background-size: 12px auto;
}

.form-row input::placeholder {
    color: var(--color-text-muted);
}

.form-row input:focus, .form-row select:focus {
    border-color: var(--color-primary);
}

.top-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 40px;
    background-color: var(--color-bg);
    border-bottom: 1px solid var(--color-border); 
    position: sticky;
    top: 0;
    z-index: 10;
}

.logo-small { font-size: 1.4rem; font-weight: 800; color: var(--color-text-main); font-family: var(--font-heading); letter-spacing: -0.5px;}
.logo-a { color: inherit; }
.stats { display: flex; gap: 30px; font-size: 1.1rem; color: var(--color-text-main); }
.streak, .crowns { font-weight: 700; display: flex; align-items: center; gap: 5px; }
.streak::before { content: 'Serie: '; font-weight: 500; color: var(--color-text-muted); }
.crowns::before { content: 'Kronen: '; font-weight: 500; color: var(--color-text-muted); }

/* --- TWO-COLUMN PATH ARTICLE LAYOUT (Lernpfad.png Match) --- */
.path-container {
    padding-bottom: 100px;
}

.unit-article {
    background: var(--color-bg);
    margin: 0;
    width: 100%;
    position: relative;
    border-bottom: 1px solid var(--color-border);
}

.path-intro {
    max-width: 900px;
    margin: 0 auto;
    padding: 50px 40px 40px;
}

/* Path view intro block */
.path-intro-block {
    max-width: 900px;
    margin: 0 auto;
    padding: 60px 40px;
    border-bottom: 1px solid var(--color-border);
}
.path-intro-heading {
    font-family: var(--font-heading);
    font-weight: 800;
    font-size: clamp(1.8rem, 4.5vw, 3.5rem);
    letter-spacing: -0.05em;
    color: var(--color-text-main);
    margin-bottom: 14px;
}
.path-intro-lead {
    font-family: var(--font-body);
    font-size: 1.1rem;
    font-weight: 400;
    color: var(--color-text-muted);
    line-height: 1.7;
    margin-bottom: 10px;
}
.path-intro-meta {
    font-family: var(--font-body);
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--color-text-muted);
    margin-bottom: 24px;
}
#path-progress-stat {
    color: var(--color-primary);
}
.path-install-wrap {
    display: block;
    width: 100%;
}
.path-install-btn {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    background: var(--color-text-main);
    border: none;
    border-radius: 12px;
    padding: 16px 24px;
    font-family: var(--font-body);
    font-size: 0.9rem;
    font-weight: 700;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--color-text-inv);
    cursor: pointer;
    transition: opacity 0.15s;
}
.path-install-btn:hover {
    opacity: 0.85;
    background: var(--color-text-main);
}
.path-install-chevron {
    display: inline-block;
    transition: transform 0.25s ease;
    font-size: 1.2rem;
    line-height: 1;
    opacity: 0.6;
}
.path-install-btn[aria-expanded="true"] .path-install-chevron {
    transform: rotate(180deg);
}
.path-install-drawer {
    margin-top: 12px;
    padding: 16px 20px;
    background: var(--color-error-bg);
    border: 1.5px solid var(--color-error-border);
    border-radius: var(--border-radius-md);
    font-family: var(--font-body);
    font-size: 0.95rem;
    font-weight: 400;
    color: var(--color-text-main);
    line-height: 1.7;
    animation: drawerOpen 0.2s ease;
}
@keyframes drawerOpen {
    from { opacity: 0; transform: translateY(-6px); }
    to   { opacity: 1; transform: translateY(0); }
}

/* Test score bar in unit overview */
.test-btn-wrapper {
    margin-bottom: 12px;
}
.test-score-row {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-top: 8px;
}
.test-score-bar {
    flex: 1;
    height: 6px;
    background: var(--color-border);
    border-radius: 3px;
    overflow: hidden;
}
.test-score-fill {
    height: 100%;
    border-radius: 3px;
    transition: width 0.4s ease;
}
.test-score-label {
    font-family: var(--font-body);
    font-size: 0.85rem;
    font-weight: 700;
    min-width: 36px;
    text-align: right;
}
.inline-icon {
    width: 1.2em;
    height: 1.2em;
    vertical-align: -0.15em;
    display: inline-block;
}
@media (max-width: 600px) {
    .path-intro-block {
        padding: 30px 20px 16px;
    }
}

.unit-banner {
    width: 100%;
    height: 72px;
    background-color: #1A1A1A;
    position: relative;
    overflow: hidden;
}
.unit-banner--scored {
    display: flex;
    align-items: center;
    background-color: var(--color-border);
}
.unit-banner-fill {
    position: absolute;
    left: 0;
    top: 0;
    height: 100%;
    width: 0%;
    transition: width 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}
.unit-banner-label {
    position: relative;
    z-index: 1;
    width: 100%;
    text-align: center;
    font-family: var(--font-heading);
    font-size: 1.6rem;
    font-weight: 800;
    letter-spacing: -0.02em;
    color: #FFFFFF;
}

.unit-body {
    max-width: 900px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    padding: 60px 40px;
}

/* LEFT SIDEBAR Meta Data */
.unit-sidebar {
    width: 250px;
    flex-shrink: 0;
}

.meta-item {
    display: flex;
    gap: 15px;
    align-items: flex-start;
    padding: 15px 0;
    border-bottom: 1px solid var(--color-border);
}
.meta-item .icon { font-size: 1.4rem; }
.meta-item strong { display: block; font-size: 0.95rem; font-family: var(--font-heading); color: var(--color-text-main); font-weight: 800; margin-bottom: 5px; }
.meta-item div { font-size: 0.95rem; color: var(--color-text-main); line-height: 1.4; }

/* RIGHT CONTENT Theory & Tests */
.unit-content-box {
    flex: 1;
}

.unit-title {
    font-size: clamp(1.8rem, 4.5vw, 3.5rem);
    margin-bottom: 10px;
    color: var(--color-text-main);
    font-family: var(--font-heading);
    letter-spacing: -0.05em;
    font-weight: 800;
}

.unit-subtitle {
    font-size: clamp(1.2rem, 2.5vw, 1.8rem);
    margin-bottom: 40px;
    color: var(--color-text-main);
    font-weight: 700;
    font-family: var(--font-heading);
    letter-spacing: -0.03em;
}

.unit-theory-box {
    color: var(--color-text-main);
    font-size: 1.4rem;
    line-height: 1.8;
    font-family: var(--font-body);
}

.unit-theory-box h3, .unit-theory-box h4 {
    color: var(--color-text-main);
    margin-top: 40px;
    margin-bottom: 15px;
    font-family: var(--font-heading);
    font-weight: 800;
    letter-spacing: -0.03em;
}
.unit-theory-box h3 { 
    font-size: clamp(1.4rem, 3vw, 1.8rem); 
    border-bottom: none; 
    display: block; 
    padding-bottom: 0; 
}
.unit-theory-box h4 { font-size: clamp(1.1rem, 2.5vw, 1.3rem); margin-top: 30px; }

.unit-theory-box strong {
    color: var(--color-text-main);
    font-weight: 800;
}
.unit-theory-box p {
    margin-bottom: 20px;
    font-weight: 600;
}

.unit-theory-box table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
    margin-top: 24px;
    margin-bottom: 24px;
    border-radius: var(--border-radius-md);
    overflow: hidden;
}

.unit-theory-box th, .unit-theory-box td {
    padding: 12px 16px;
    text-align: left;
    border-bottom: 1px solid var(--color-border);
    font-size: 1.05rem;
    font-family: var(--font-body);
    font-weight: 600;
}

.unit-theory-box th {
    background-color: var(--color-text-main);
    color: var(--color-text-inv);
    font-family: var(--font-heading);
    font-weight: 800;
    font-size: 0.9rem;
    letter-spacing: 0.04em;
    border-bottom: none;
    padding: 12px 16px;
}

.unit-theory-box tr:last-child td {
    border-bottom: none;
}

.unit-tests-container {
    margin-top: 60px;
}
/* ------------------------------- */

.lesson-header {
    display: flex;
    align-items: center;
    padding: 30px 40px;
    gap: 30px;
    border-bottom: 1px solid var(--color-border);
}
.close-btn { background: none; border: none; font-size: 2rem; color: var(--color-text-main); cursor: pointer; transition: transform 0.2s;}
.close-btn:hover { transform: scale(1.1); }
.progress-container { flex: 1; height: 10px; background-color: var(--color-border); border-radius: 5px; overflow: hidden; }
.progress-fill { height: 100%; width: 0%; background: var(--color-text-main); transition: width 0.4s ease; border-radius: 5px; }

.lesson-content { flex: 1; display: flex; flex-direction: column; align-items: flex-start; padding: 60px 40px 100px; max-width: 900px; margin: 0 auto; width: 100%;}
.question-text { font-size: clamp(1.4rem, 3vw, 2.2rem); font-weight: 800; color: var(--color-text-main); margin-bottom: 50px; text-align: left; font-family: var(--font-heading); letter-spacing: -0.03em;}

.options-grid { display: grid; grid-template-columns: 1fr; gap: 16px; width: 100%; }

.option-card {
    background-color: var(--color-bg);
    border: 2px solid var(--color-border);
    border-radius: var(--border-radius-md);
    padding: 24px 30px;
    font-size: 1.25rem;
    font-weight: 700;
    font-family: var(--font-body);
    color: var(--color-text-main);
    cursor: pointer;
    text-align: left;
    transition: all 0.2s ease;
    outline: none;
}

.option-card:hover { border-color: var(--color-text-main); background-color: var(--color-surface-hover); }
.option-card:active { transform: scale(0.98); }

.option-card.selected {
    border-color: #35858E;
    background-color: rgba(53, 133, 142, 0.08);
    color: var(--color-text-main);
}

.lesson-footer {
    display: flex;
    flex-direction: column;
    gap: 10px;
    padding: 20px 40px;
    padding-bottom: calc(20px + env(safe-area-inset-bottom, 0px));
    background-color: var(--color-bg);
    border-top: 1px solid var(--color-border);
    position: sticky;
    bottom: 0;
    transition: background-color 0.2s;
}

.lesson-footer.correct { background-color: rgba(52, 199, 89, 0.05); border-top: 2px solid var(--color-success-border); }
.lesson-footer.incorrect { background-color: rgba(255, 59, 48, 0.05); border-top: 2px solid var(--color-error-border); }

.footer-msg { font-size: 1.4rem; font-weight: 800; color: transparent; flex: 1; font-family: var(--font-heading);}
.lesson-footer.correct .footer-msg { color: var(--color-success-border); }
.lesson-footer.incorrect .footer-msg { color: var(--color-error-border); }

.lesson-footer .btn { padding: 20px 48px; border-radius: 12px; font-size: 1.1rem; width: 100%; }
.btn:disabled { background-color: var(--color-border); color: var(--color-text-muted); cursor: not-allowed; }

/* Typing Exercise Styles */
.typing-container {
    width: 100%;
}

.typing-input {
    width: 100%;
    background-color: var(--color-bg);
    border: 3px solid var(--color-border);
    border-radius: var(--border-radius-md);
    padding: 24px 30px;
    font-size: 1.5rem;
    font-weight: 700;
    font-family: var(--font-body);
    color: var(--color-text-main);
    outline: none;
    transition: all 0.2s ease;
}

.typing-input::placeholder {
    color: #A0A0A0;
    font-weight: 400;
}

.typing-input:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 5px rgba(221, 138, 115, 0.15);
}

.typing-input.correct {
    border-color: var(--color-success-border);
    background-color: rgba(194, 208, 153, 0.2);
    color: #5a7a2e;
}

.typing-input.incorrect {
    border-color: var(--color-error-border);
    background-color: rgba(255, 131, 131, 0.15);
    color: #c0392b;
}

/* ===== TRUE/FALSE CARDS ===== */
.tf-card {
    text-align: center;
    font-size: 1.3rem;
    padding: 20px;
}

/* ===== FILL-IN-THE-BLANK ===== */
.fill-blank-sentence {
    font-size: 1.3rem;
    font-weight: 600;
    line-height: 1.8;
    color: var(--color-text-main);
    margin-bottom: 24px;
    padding: 20px;
    background: var(--color-surface);
    border-radius: var(--border-radius-md);
    border: 1px solid var(--color-border);
}

.blank-slot {
    display: inline-block;
    min-width: 80px;
    padding: 4px 12px;
    border-bottom: 3px solid var(--color-primary);
    color: var(--color-primary);
    font-weight: 800;
    text-align: center;
    transition: all 0.2s;
}

.blank-slot.correct {
    border-color: var(--color-success-border);
    color: #5a7a2e;
}

.blank-slot.incorrect {
    border-color: var(--color-error-border);
    color: #c0392b;
}

.fill-blank-options {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.fill-option {
    flex: 0 0 auto;
    text-align: center;
    padding: 14px 24px;
}

/* ===== MATCHING PAIRS ===== */
.match-container {
    display: flex;
    gap: 24px;
    width: 100%;
}

.match-column {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.match-column-header {
    font-family: var(--font-heading);
    font-weight: 800;
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--color-text-muted);
    padding: 0 4px 4px;
}

.match-card {
    text-align: center;
    transition: all 0.2s;
}

.match-card.matched {
    border-color: var(--color-success-border);
    background-color: rgba(194, 208, 153, 0.2);
    opacity: 0.7;
    pointer-events: none;
}

.match-card.wrong {
    border-color: var(--color-error-border);
    background-color: rgba(255, 131, 131, 0.15);
    animation: shake 0.4s ease;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    20% { transform: translateX(-6px); }
    40% { transform: translateX(6px); }
    60% { transform: translateX(-4px); }
    80% { transform: translateX(4px); }
}

/* ===== WORD ORDER / SENTENCE BUILDER ===== */
.word-order-built {
    min-height: 60px;
    padding: 16px;
    border: 2px dashed var(--color-border);
    border-radius: var(--border-radius-md);
    margin-bottom: 24px;
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    align-items: center;
    transition: all 0.2s;
}

.word-order-built:empty::before {
    content: attr(data-placeholder);
    color: var(--color-text-muted);
    font-size: 0.95rem;
}

.word-order-built.correct {
    border-color: var(--color-success-border);
    background-color: rgba(194, 208, 153, 0.1);
}

.word-order-built.incorrect {
    border-color: var(--color-error-border);
    background-color: rgba(255, 131, 131, 0.1);
}

.built-word {
    display: inline-block;
    padding: 8px 16px;
    background: var(--color-text-main);
    color: var(--color-text-inv);
    border-radius: 50px;
    font-weight: 600;
    font-size: 1rem;
}

.word-order-tiles {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.word-tile {
    padding: 12px 20px;
    background: var(--color-surface);
    border: 2px solid var(--color-border);
    border-radius: 50px;
    font-family: var(--font-body);
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--color-text-main);
    cursor: pointer;
    transition: all 0.2s;
}

.word-tile:hover {
    border-color: var(--color-text-main);
}

.word-tile.used {
    background: var(--color-border);
    color: var(--color-text-muted);
    border-color: transparent;
    opacity: 0.5;
}

/* ===== HAMBURGER MENU ===== */
.hamburger {
    display: none;
    background: none;
    border: none;
    font-size: 1.8rem;
    cursor: pointer;
    color: var(--color-text-main);
    padding: 8px;
    line-height: 1;
}

/* Share button in desktop header (visible on desktop) */
.share-btn-desktop {
    display: inline-block;
}

/* Share button inside mobile nav (hidden on desktop) */
.nav-share-btn {
    display: none;
}

/* ===== RESPONSIVE: TABLET & PHONE (<1024px) ===== */
@media (max-width: 1023px) {
    .hamburger {
        display: block;
    }

    .share-btn-desktop {
        display: none;
    }

    .nav-share-btn {
        display: inline-block;
        margin-top: 10px;
    }

    /* Landing header nav */
    .landing-header .top-nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        flex-direction: column;
        background: var(--color-bg);
        border-bottom: 1px solid var(--color-border);
        padding: 20px 30px;
        gap: 0;
        box-shadow: 0 8px 30px rgba(0,0,0,0.08);
        z-index: 100;
    }

    .landing-header .top-nav-links a,
    .landing-header .top-nav-links .nav-share-btn {
        padding: 14px 0;
        border-bottom: 1px solid var(--color-border);
        font-size: 1.1rem;
    }

    .landing-header .top-nav-links a:last-of-type {
        border-bottom: none;
    }

    .landing-header.nav-open .top-nav-links {
        display: flex;
    }

    .landing-header {
        position: relative;
    }

    /* Top nav (about, path views) */
    .top-nav .top-nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        flex-direction: column;
        background: var(--color-bg);
        border-bottom: 1px solid var(--color-border);
        padding: 20px 30px;
        gap: 0;
        box-shadow: 0 8px 30px rgba(0,0,0,0.08);
        z-index: 100;
    }

    .top-nav .top-nav-links a {
        padding: 14px 0;
        border-bottom: 1px solid var(--color-border);
        font-size: 1.1rem;
    }

    .top-nav .top-nav-links a:last-child {
        border-bottom: none;
    }

    .top-nav.nav-open .top-nav-links {
        display: flex;
    }

    .top-nav {
        position: relative;
    }

    /* Path view: hide hamburger since stats are already there */
    #path-view .hamburger {
        display: none;
    }

    /* Tablet: stack unit sidebar above content */
    .unit-body {
        flex-direction: column;
        gap: 30px;
    }

    .unit-sidebar {
        width: 100%;
        flex-shrink: 1;
        display: flex;
        flex-wrap: wrap;
        gap: 10px;
    }

    .meta-item {
        flex: 1 1 auto;
        min-width: 180px;
    }
}

/* ===== RESPONSIVE: PHONE (<600px) ===== */
@media (max-width: 599px) {
    .landing-header {
        padding: 15px 20px;
    }

    .hero-section {
        flex-direction: column;
        padding: 30px 20px;
        gap: 24px;
    }

    .hero-content {
        min-width: unset;
        width: 100%;
    }

    .search-panel {
        max-width: 100%;
        padding: 24px;
    }

    .form-panel {
        padding: 24px 20px;
        margin: 20px auto;
    }

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

    .form-row input,
    .form-row select,
    .form-row .btn {
        flex: 1 1 100%;
    }

    .stats {
        flex-wrap: wrap;
        gap: 15px;
    }

    .top-nav {
        padding: 15px 20px;
    }

    .unit-banner {
        height: 50px;
    }
    .unit-banner-label {
        font-size: 1.2rem;
    }

    .unit-body {
        flex-direction: column;
        padding: 30px 20px;
        gap: 20px;
    }

    .unit-sidebar {
        width: 100%;
        flex-shrink: 1;
    }

    .lesson-header {
        padding: 20px;
        gap: 15px;
    }

    .lesson-content {
        padding: 16px 16px 100px;
    }

    .lesson-footer {
        position: fixed;
        bottom: 0;
        left: 0;
        right: 0;
        z-index: 100;
        padding: 14px 16px;
        padding-bottom: calc(14px + env(safe-area-inset-bottom, 34px));
    }

    .footer-msg {
        font-size: 1.1rem;
    }

    .lesson-footer .btn {
        padding: 14px 30px;
        font-size: 1rem;
    }

    /* Touch-friendly targets on phone */
    .btn {
        padding: 14px 28px;
        min-height: 48px;
    }

    .option-card {
        padding: 20px 24px;
        min-height: 48px;
    }

    .typing-input {
        font-size: 16px; /* prevents iOS auto-zoom on focus */
        padding: 18px 20px;
    }

    .form-row input,
    .form-row select {
        font-size: 16px; /* prevents iOS auto-zoom */
        padding: 14px 20px;
        min-height: 48px;
    }

    .top-nav-links a {
        min-height: 44px;
        display: flex;
        align-items: center;
    }

    /* Sprint 5: Final spacing polish */
    .glass-panel {
        padding: 16px;
    }

    .hero-section h1 {
        margin-bottom: 12px;
    }

    .question-text {
        margin-bottom: 16px;
    }

    .unit-tests-container {
        margin-top: 30px;
    }

    .unit-tests-container .btn {
        width: 100% !important;
        margin-right: 0 !important;
        padding: 14px 20px !important;
        font-size: 1rem !important;
    }

    .unit-theory-box table {
        width: 100%;
        table-layout: fixed;
    }

    .unit-theory-box th,
    .unit-theory-box td {
        padding: 10px 12px;
        white-space: normal;
        word-break: break-word;
        font-size: 0.95rem;
    }

    .lesson-footer {
        flex-wrap: wrap;
        gap: 10px;
    }

    .lesson-footer .footer-msg {
        flex: 1 1 100%;
    }

    /* New exercise types – phone */
    .match-container {
        flex-direction: column;
        gap: 0;
    }

    .match-column:first-child {
        padding-bottom: 16px;
        border-bottom: 2px solid var(--color-border);
        margin-bottom: 16px;
    }

    .fill-blank-sentence {
        font-size: 1.1rem;
        padding: 16px;
    }

    .fill-option {
        padding: 12px 18px;
        font-size: 0.95rem;
    }

    .word-tile {
        padding: 10px 16px;
        font-size: 0.95rem;
    }

    .built-word {
        padding: 6px 12px;
        font-size: 0.9rem;
    }
}

/* ===== PREVENT HORIZONTAL OVERFLOW GLOBALLY ===== */
html, body {
    overflow-x: hidden;
}

img {
    max-width: 100%;
    height: auto;
}

/* Ensure background blobs don't cause overflow */
.alpine-background {
    overflow: hidden;
    position: fixed;
    inset: 0;
    pointer-events: none;
}