:root {
    --bg-color: #f5f5f5;
    --sidebar-color: #e0e0e0;
    --primary-dark: #1a1a1a;
    --border-color: #cccccc;
    --accent-purple: #7b61ff;
    --hover-color: #d1d1d1;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: Arial, sans-serif;
}

body {
    background-color: var(--bg-color);
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    overflow-x: hidden; 
}

.nav-toggle-input { display: none; }

.header {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    padding: 10px 20px;
    background: #fff;
    border-bottom: 2px solid var(--border-color);
    gap: 15px;
    position: relative;
    z-index: 20;
}

.logo-area, .logo, .auth-buttons {
    display: flex;
    align-items: center;
    gap: 15px;
}
.auth-buttons { gap: 10px; }
.logo { gap: 5px; }

.menu-btn {
    font-size: 24px;
    cursor: pointer;
    user-select: none;
    padding: 5px;
    transition: transform 0.2s;
}
.menu-btn:hover { transform: scale(1.1); }

.search-bar { order: 3; width: 100%; }
.search-bar input {
    width: 100%;
    padding: 8px 15px;
    border-radius: 20px;
    border: 1px solid var(--border-color);
}

.btn-dark {
    background: var(--primary-dark);
    color: white;
    padding: 6px 15px;
    border-radius: 5px;
    border: none;
    cursor: pointer;
}

.btn-text { background: none; border: none; font-weight: bold; cursor: pointer; }
.user-avatar { width: 35px; height: 35px; background: #ccc; border-radius: 50%; }

.layout {
    display: flex;
    flex-direction: column;
    flex: 1;
    position: relative;
}

.sidebar {
    position: absolute;
    top: 0; left: 0; width: 100%;
    background: var(--sidebar-color);
    padding: 20px;
    z-index: 10; 
    transform: translateY(-150%); 
    transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 10px 15px rgba(0,0,0,0.1);
}

.nav-toggle-input:checked ~ .layout .sidebar { transform: translateY(0); }

.home-btn {
    display: flex;
    align-items: center;
    gap: 10px;
    background: var(--primary-dark);
    color: white;
    padding: 12px 15px;
    border-radius: 8px;
    text-decoration: none;
    font-weight: bold;
    transition: background 0.3s ease;
}
.home-btn:hover { background: #333333; }

.divider { border: none; border-top: 1px solid #c0c0c0; margin: 15px 0; }
.nav-links { list-style: none; }
.nav-links li {
    margin-bottom: 5px;
    border-radius: 8px;
    transition: background-color 0.2s ease;
}
.nav-links li:hover { background-color: var(--hover-color); }
.nav-links a {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 15px;
    text-decoration: none;
    color: #333;
    border-radius: 8px;
}

.main-content {
    padding: 20px;
    background: white;
    flex: 1;
    transition: margin-left 0.4s ease; 
    min-height: 80vh; /* CLS стабілізація */
}

.project-header { 
    display: flex; 
    justify-content: space-between; 
    align-items: center; 
    border: 1px solid var(--border-color); 
    padding: 10px 15px; 
    margin-bottom: 20px; 
    border-radius: 5px; 
}

.kanban-board { display: grid; grid-template-columns: 1fr; gap: 20px; }
.column { 
    border: 1px solid var(--border-color); 
    border-radius: 10px; 
    padding: 15px; 
    min-height: 150px; 
    background: #fafafa; 
}

/* Об'єднані стилі картки (Головна сторінка + Drag&Drop) */
.card { 
    background: white; 
    border: 1px solid #ddd; 
    margin: 10px 0; 
    padding: 10px 15px; 
    border-radius: 8px; 
    display: flex; 
    flex-direction: column;
    justify-content: space-between; 
    gap: 5px;
    cursor: grab; 
    transition: box-shadow 0.2s; 
}
.card:hover { box-shadow: 0 4px 8px rgba(0,0,0,0.1); }
.card:active { cursor: grabbing; }
.card.dragging { opacity: 0.5; border: 2px dashed var(--accent-purple); }

.card-title { font-weight: bold; font-size: 16px; }
.card-desc { font-size: 13px; color: #555; }
.card-author { font-size: 11px; color: #888; text-align: right; margin-top: 5px; }

/* Об'єднаний контейнер карток (ТЗ 4 + Стабілізація CLS) */
.card-list {
    min-height: 150px;
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-top: 10px;
    background-color: rgba(0, 0, 0, 0.01);
    border-radius: 6px;
    transition: background-color 0.2s ease;
}

.column-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 10px; }

.btn-create-task {
    background-color: var(--accent-purple);
    color: white;
    border: none;
    padding: 5px 10px;
    border-radius: 5px;
    cursor: pointer;
    font-size: 12px;
}
.btn-create-task:hover { background-color: #5d46cc; }

.progress-section { margin-top: 30px; display: flex; align-items: center; gap: 15px; flex-wrap: wrap;}
.progress-container { flex: 1; max-width: 400px; background: #eee; height: 15px; border-radius: 10px; }
.progress-bar { background: var(--primary-dark); height: 100%; border-radius: 10px; transition: width 0.5s ease; }

/* Об'єднані текстові поля форм (Звичайна форма + Контакти) */
.form-group input, .form-group textarea,
.contact-form input, .contact-form textarea {
    width: 100%;
    padding: 10px;
    border: 1px solid var(--border-color);
    border-radius: 5px;
    font-family: inherit;
}

.form-group { margin-bottom: 15px; }
.form-group label { display: block; margin-bottom: 5px; font-weight: bold; font-size: 14px; }
.w-100 { padding: 10px; font-size: 16px; }

/* Модальні вікна */
.modal {
    display: none;
    position: fixed;
    z-index: 100;
    left: 0; top: 0; width: 100%; height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    align-items: center;
    justify-content: center;
}
.modal.active { display: flex; }
.modal-content {
    background-color: #fff;
    padding: 20px;
    border-radius: 8px;
    width: 90%;
    max-width: 400px;
    position: relative;
    box-shadow: 0 5px 15px rgba(0,0,0,0.3);
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(-20px); }
    to { opacity: 1; transform: translateY(0); }
}

.close-btn { position: absolute; top: 10px; right: 15px; font-size: 24px; font-weight: bold; color: #aaa; cursor: pointer; }
.close-btn:hover { color: #000; }

/* Сторінки SPA */
.page-container { animation: fadeIn 0.4s ease; }
.page-container h2 { margin-bottom: 20px; color: var(--primary-dark); }
.page-container p { line-height: 1.6; color: #555; margin-bottom: 15px; }
.contact-form { max-width: 500px; display: flex; flex-direction: column; gap: 15px; }

/* Дані з API */
.api-container { margin-top: 20px; }
.api-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 20px; }
.api-card {
    background: white;
    padding: 20px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    box-shadow: 0 2px 8px rgba(0,0,0,0.05);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}
.api-card:hover { transform: translateY(-5px); box-shadow: 0 5px 15px rgba(0,0,0,0.1); }
.api-card h4 { color: var(--primary-dark); margin-bottom: 10px; font-size: 16px; line-height: 1.4; }
.api-card p { color: #555; font-size: 14px; line-height: 1.5; }

/* Статуси, Завантаження та Помилки */
.loader {
    border: 4px solid #f3f3f3;
    border-top: 4px solid var(--accent-purple);
    border-radius: 50%;
    width: 40px; height: 40px;
    animation: spin 1s linear infinite;
    margin: 40px auto 20px auto;
}
@keyframes spin { 0% { transform: rotate(0deg); } 100% { transform: rotate(360deg); } }
.loading-text { text-align: center; color: #666; font-weight: bold; }
.error-message { background-color: #fee2e2; color: #991b1b; padding: 15px; border-radius: 8px; border: 1px solid #f87171; text-align: center; margin-top: 20px; }

/* Адаптивність (Медіа-запити) */
@media (min-width: 768px) {
    .layout { flex-direction: row; }
    .search-bar { order: 2; width: auto; flex: 1; max-width: 300px; }
    .sidebar {
        position: static; width: 250px; min-width: 250px; transform: none; box-shadow: none; margin-left: 0;
        transition: margin-left 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .nav-toggle-input:checked ~ .layout .sidebar { margin-left: -250px; }
    .kanban-board { grid-template-columns: repeat(2, 1fr); }
}

@media (min-width: 1024px) {
    .kanban-board { grid-template-columns: repeat(3, 1fr); }
    .main-content { padding: 40px; }
}