.container {
    max-width: 1200px;
    margin: 0 auto;
    background: white;
    border-radius: 20px;
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.15);
    overflow: hidden;
}

.container .header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 40px;
    text-align: center;
    position: static;
}

.container .header h1 {
    font-size: 2.8em;
    margin-bottom: 15px;
    font-weight: 700;
}

.container .header p {
    font-size: 1.2em;
    opacity: 0.9;
}

.platform-tabs {
    display: flex;
    gap: 10px;
    margin: 30px;
    justify-content: center;
    flex-wrap: wrap;
}

.tab-btn {
    padding: 12px 20px;
    background: #f8f9fa;
    border: 2px solid #e9ecef;
    border-radius: 10px;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.3s;
    color: #6c757d;
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.95em;
}

.tab-btn.active {
    background: #667eea;
    color: white;
    border-color: #667eea;
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.3);
}

.tab-btn.twitter.active {
    background: #1DA1F2;
    border-color: #1DA1F2;
}

.tab-btn.instagram.active {
    background: linear-gradient(45deg, #f09433 0%, #e6683c 25%, #dc2743 50%, #cc2366 75%, #bc1888 100%);
    border-color: #bc1888;
}

.tab-btn.facebook.active {
    background: #4267B2;
    border-color: #4267B2;
}

.tab-btn.linkedin.active {
    background: #0077B5;
    border-color: #0077B5;
}

.tab-btn.youtube.active {
    background: #FF0000;
    border-color: #FF0000;
}

.tab-btn.tiktok.active {
    background: #000000;
    border-color: #000000;
}

.container .main-content {
    padding: 40px;
}

.editor-section {
    background: #f8f9fa;
    border-radius: 15px;
    overflow: hidden;
    border: 2px solid #e9ecef;
    margin-bottom: 30px;
}

.editor-header {
    background: #343a40;
    color: white;
    padding: 20px 25px;
    display: flex;
    justify-content: between;
    align-items: center;
}

.editor-title {
    font-size: 1.2em;
    font-weight: 600;
}

.platform-info {
    display: flex;
    align-items: center;
    gap: 10px;
    color: rgba(255, 255, 255, 0.8);
    font-size: 0.9em;
}

.text-editor {
    width: 100%;
    min-height: 200px;
    padding: 25px;
    border: none;
    outline: none;
    font-size: 16px;
    line-height: 1.6;
    resize: vertical;
    background: white;
    color: #2d3748;
}

.stats-footer {
    background: #f8f9fa;
    padding: 20px 25px;
    border-top: 1px solid #e9ecef;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 20px;
}

.stat-item {
    text-align: center;
    padding: 15px;
    background: white;
    border-radius: 10px;
    border: 2px solid #e9ecef;
    transition: all 0.3s;
}

.stat-number {
    font-size: 2em;
    font-weight: 700;
    color: #667eea;
    display: block;
    margin-bottom: 5px;
}

.stat-label {
    color: #6c757d;
    font-weight: 500;
    font-size: 0.9em;
}

.limit-indicator {
    margin-top: 8px;
    height: 6px;
    background: #e9ecef;
    border-radius: 3px;
    overflow: hidden;
}

.limit-fill {
    height: 100%;
    border-radius: 3px;
    transition: all 0.3s;
    background: #28a745;
}

.limit-fill.warning {
    background: #ffc107;
}

.limit-fill.danger {
    background: #dc3545;
}

.limit-fill.over {
    background: #6f42c1;
}

.platform-limits {
    background: white;
    border-radius: 15px;
    padding: 25px;
    border: 2px solid #e9ecef;
    margin-bottom: 30px;
}

.limits-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 15px;
    margin-top: 20px;
}

.limit-card {
    background: #f8f9fa;
    padding: 20px;
    border-radius: 12px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s;
    border: 2px solid #e9ecef;
}

.limit-card:hover {
    border-color: #667eea;
    transform: translateY(-2px);
}

.limit-platform {
    font-weight: 600;
    color: #495057;
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.limit-value {
    font-size: 1.5em;
    color: #667eea;
    font-weight: 700;
    margin-bottom: 5px;
}

.limit-description {
    font-size: 0.85em;
    color: #6c757d;
}

.tools-section {
    background: white;
    border-radius: 15px;
    padding: 25px;
    border: 2px solid #e9ecef;
    margin-bottom: 30px;
}

.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 15px;
    margin-top: 20px;
}

.tool-btn {
    padding: 12px 15px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    border-radius: 10px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    font-size: 0.9em;
}

.tool-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(102, 126, 234, 0.4);
}

.tool-btn.secondary {
    background: linear-gradient(135deg, #6c757d 0%, #495057 100%);
}

.hashtag-section {
    background: white;
    border-radius: 15px;
    padding: 25px;
    border: 2px solid #e9ecef;
    margin-bottom: 30px;
}

.hashtag-input {
    width: 100%;
    padding: 15px;
    border: 2px solid #e9ecef;
    border-radius: 10px;
    font-size: 16px;
    margin-bottom: 15px;
}

.hashtag-list {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 15px;
}

.hashtag-tag {
    background: #e3f2fd;
    color: #1976d2;
    padding: 6px 12px;
    border-radius: 20px;
    font-size: 0.9em;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s;
}

.hashtag-tag:hover {
    background: #1976d2;
    color: white;
}

.preview-section {
    background: white;
    border-radius: 15px;
    padding: 25px;
    border: 2px solid #e9ecef;
    margin-bottom: 30px;
}

.preview-card {
    background: #f8f9fa;
    border-radius: 12px;
    padding: 20px;
    border: 2px solid #e9ecef;
    margin-top: 15px;
}

.preview-header {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 15px;
}

.preview-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: #667eea;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 600;
}

.preview-user {
    font-weight: 600;
    color: #495057;
}

.preview-content {
    color: #2d3748;
    line-height: 1.6;
    word-wrap: break-word;
}

.ad-space {
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    padding: 25px;
    text-align: center;
    color: #6c757d;
    margin: 30px 0;
    border-radius: 15px;
    border: 2px dashed #dee2e6;
}

.tips-section {
    background: #f8f9fa;
    padding: 40px;
    margin-top: 30px;
}

.tips-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 25px;
    margin-top: 25px;
}

.tip-card {
    background: white;
    padding: 25px;
    border-radius: 15px;
    border-left: 5px solid #667eea;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.08);
}

.tip-title {
    font-weight: 600;
    color: #495057;
    margin-bottom: 12px;
    font-size: 1.1em;
}

@media (max-width: 768px) {
    .container .main-content {
        padding: 20px;
    }

    .header h1 {
        font-size: 2.2em;
    }

    .platform-tabs {
        flex-direction: column;
        margin: 20px;
    }

    .stats-footer {
        grid-template-columns: repeat(2, 1fr);
    }
}