:root {
    --primary-blue: #2563eb;
    --primary-green: #22c55e;
    --bg-color: #f3f4f6;
    --white: #ffffff;
    --border-color: #e5e7eb;
    --text-dark: #1f2937;
    --text-light: #6b7280;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-dark);
    height: auto;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}


/* --- HEADER --- */
header {
    background: var(--white);
    padding: 15px 0;
    border-bottom: 1px solid var(--border-color);
}

.header-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between; /* Pushes Logo left and Links right */
    align-items: center;
}

.header-left { display: flex; align-items: center; }

/* Right Side Navigation */
.header-right { 
    display: flex; 
    align-items: center; 
    gap: 25px; /* Space between Home and Lang selector */
}

/* The Home Link Style */
.nav-link {
    text-decoration: none;
    color: var(--text-dark);
    font-weight: 600;
    font-size: 0.95rem;
    transition: color 0.2s;
}

.nav-link:hover {
    color: var(--primary-blue);
}

.logo { font-size: 1.3rem; font-weight: 800; }
.logo span { color: var(--primary-blue); }

.lang-selector {
    font-size: 0.9rem;
    color: var(--text-light);
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: default;
}


/* --- APP LAYOUT --- */
main {
    flex-grow: 1;
    padding: 30px 20px;
}

.app-container {
    max-width: 1400px;
    margin: 0 auto 50px auto;
    display: grid;
    grid-template-columns: 1fr 350px;
    gap: 25px;
    height: 600px; 
}

/* Left Editor Column */
.editor-column {
    background: var(--white);
    border-radius: 12px;
    box-shadow: 0 4px 6px -1px rgba(0,0,0,0.05);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    border: 1px solid var(--border-color);
}

.editor-wrapper {
    flex-grow: 1;
    position: relative;
    padding: 30px;
    overflow-y: auto;
}

textarea, #highlightOverlay {
    width: 100%;
    height: 100%;
    border: none;
    outline: none;
    resize: none;
    font-size: 1.15rem;
    line-height: 1.8;
    font-family: inherit;
    background: transparent;
}

#highlightOverlay {
    position: absolute;
    top: 30px; left: 30px; right: 30px; bottom: 30px;
    white-space: pre-wrap;
    z-index: 10;
    pointer-events: none;
}

.mistake {
    border-bottom: 2px solid #ef4444;
    background-color: rgba(239, 68, 68, 0.1);
}

.editor-footer {
    border-top: 1px solid var(--border-color);
    padding: 15px 25px;
    background: #f9fafb;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.stats { font-size: 0.85rem; color: var(--text-light); display: flex; gap: 15px; }

.icon-btn {
    background: white;
    border: 1px solid var(--border-color);
    padding: 8px 12px;
    border-radius: 6px;
    cursor: pointer;
    color: var(--text-light);
    margin-left: 5px;
}
.icon-btn:hover { border-color: var(--text-dark); color: var(--text-dark); }

/* Right Sidebar Column */
.sidebar-column {
    background: var(--white);
    border-radius: 12px;
    box-shadow: 0 4px 6px -1px rgba(0,0,0,0.05);
    display: flex;
    flex-direction: column;
    padding: 20px;
    border: 1px solid var(--border-color);
    height: 100%;
    overflow: hidden;
}

.sidebar-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.primary-btn {
    background-color: var(--primary-blue);
    color: white;
    border: none;
    padding: 8px 20px;
    border-radius: 6px;
    cursor: pointer;
    font-weight: 600;
}
.primary-btn:hover { background-color: #1d4ed8; }

.badge {
    background: #e0e7ff;
    color: var(--primary-blue);
    padding: 2px 8px;
    border-radius: 12px;
    font-size: 0.8rem;
    margin-left: 5px;
}

.filter-tabs {
    display: flex;
    gap: 15px;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 10px;
    margin-bottom: 15px;
}
.tab { font-size: 0.9rem; color: var(--text-light); cursor: pointer; }
.tab.active { color: var(--text-dark); font-weight: 600; }

.count-pill { font-size: 0.75rem; color: white; padding: 1px 6px; border-radius: 4px; }
.count-pill.blue { background-color: var(--primary-blue); }
.count-pill.green { background-color: var(--primary-green); }
.count-pill.orange { background-color: #f97316; }

.results-container { flex-grow: 1; overflow-y: auto; padding-right: 5px; }
.empty-state { text-align: center; margin-top: 50px; color: var(--text-light); }

.suggestion-card {
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 15px;
    margin-bottom: 15px;
    background: #fff;
}
.correction-row { display: flex; align-items: center; gap: 10px; margin-bottom: 10px; font-weight: 500; }
.wrong-word { text-decoration: line-through; color: var(--text-light); }
.right-word { background: #d1fae5; color: #065f46; padding: 2px 6px; border-radius: 4px; }
.card-actions { display: flex; gap: 10px; margin-top: 10px; }
.dismiss-btn, .accept-btn { flex: 1; padding: 6px; border-radius: 4px; border: none; cursor: pointer; font-size: 0.9rem; }
.dismiss-btn { background: #f3f4f6; color: var(--text-light); }
.accept-btn { background: var(--primary-blue); color: white; }

.correct-all-btn { width: 100%; background: var(--primary-green); color: white; border: none; padding: 12px; border-radius: 8px; font-weight: 700; cursor: pointer; margin-top: 10px; }
.hidden { display: none !important; }

/* --- SEO CONTENT --- */
.seo-section {
    background: white;
    padding: 60px 20px;
    border-top: 1px solid var(--border-color);
}
.content-wrapper { max-width: 800px; margin: 0 auto; }
.content-wrapper h1 { font-size: 2.2rem; margin-bottom: 20px; color: var(--text-dark); }
.content-wrapper h2 { margin-top: 40px; margin-bottom: 15px; font-size: 1.5rem; }
.content-wrapper p { margin-bottom: 15px; line-height: 1.7; color: #4b5563; }

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin: 30px 0;
}
.feature-box {
    background: #f9fafb;
    padding: 20px;
    border-radius: 8px;
    text-align: center;
    border: 1px solid var(--border-color);
}
.feature-box i { font-size: 1.5rem; color: var(--primary-blue); margin-bottom: 10px; }

/* --- FOOTER --- */
footer {
    background: #1f2937;
    color: #9ca3af;
    padding: 40px 0;
    text-align: center;
}
.footer-links { margin-bottom: 20px; }
.footer-links a { color: white; margin: 0 15px; text-decoration: none; font-size: 0.95rem; }
.footer-links a:hover { text-decoration: underline; }

/* Mobile */
@media (max-width: 900px) {
    .app-container { grid-template-columns: 1fr; height: auto; }
    .sidebar-column { height: 500px; }
    .editor-column { height: 400px; }
}