:root {
    /* Cores padrão (modo claro) */
    --primary-blue: #6c50f7;
    --primary-blue-hover: #4c12a3;
    --secondary-blue: #06D6B6;
    --secondary-blue-hover: #05b89c;
    --gray: #9EF618;
    --gray-hover: #85d314;
    --danger-red: #e53e3e;
    --danger-red-hover: #c53030;
    --background-gradient-start: #e0e7ff;
    --background-gradient-end: #f3e8ff;
    --white: #ffffff;
    --white-text: #ffffff;
    --off-white: #f1f5f9;
    --light-gray: #e2e8f0;
    --light-gray-bg: #edf2f7;
    --text-dark: #1a202c;
    --text-medium: #2d3748;
    --text-gray: #4a5568;
    --card-initial: #bdecb6;
    --card-warning: #fefcbf;
    --card-due-today: #fed7aa;
    --card-overdue: #fecaca;
    --shadow-light: rgba(0, 0, 0, 0.05);
    --shadow-medium: rgba(0, 0, 0, 0.1);
    --shadow-dark: rgba(0, 0, 0, 0.15);
    --modal-overlay: rgba(0, 0, 0, 0.5);
    --loading-bg: rgba(255, 255, 255, 0.95);
}

/* Cores para modo escuro */
:root .dark-mode {
    --primary-blue: #8b5cf6;
    --primary-blue-hover: #a78bfa;
    --secondary-blue: #2ee4c8;
    --secondary-blue-hover: #5eead4;
    --gray: #bef264;
    --gray-hover: #d1f58e;
    --danger-red: #f56565;
    --danger-red-hover: #feb2b2;
    --background-gradient-start: #2d3748;
    --background-gradient-end: #4a5568;
    --white: #2d3748;
    --white-text: #ffffff;
    --off-white: #4a5568;
    --light-gray: #718096;
    --light-gray-bg: #4a5568;
    --text-dark: #e2e8f0;
    --text-medium: #cbd5e0;
    --text-gray: #a0aec0;
    --card-initial: #68d391;
    --card-warning: #faf089;
    --card-due-today: #f6ad55;
    --card-overdue: #f687b3;
    --shadow-light: rgba(255, 255, 255, 0.05);
    --shadow-medium: rgba(255, 255, 255, 0.1);
    --shadow-dark: rgba(255, 255, 255, 0.15);
    --modal-overlay: rgba(0, 0, 0, 0.7);
    --loading-bg: rgba(45, 55, 72, 0.95);
}

* {
    box-sizing: border-box;
}

body {
    font-family: 'Inter', sans-serif;
    background: linear-gradient(135deg, var(--background-gradient-start), var(--background-gradient-end));
    margin: 0;
    padding: 20px;
    color: var(--text-medium);
    overflow-y: auto;
}

.loading-screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--loading-bg);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    z-index: 2000;
}

.spinner {
    width: 50px;
    height: 50px;
    border: 5px solid var(--light-gray);
    border-top: 5px solid var(--primary-blue);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.loading-screen p {
    margin-top: 15px;
    font-size: 16px;
    font-weight: 500;
    color: var(--text-dark);
}

.kanban-container {
    max-width: 1400px;
    margin: 0 auto;
    max-height: 100vh;
    display: flex;
    flex-direction: column;
}

.kanban-container > h1 {
    font-size: 25px;
    font-weight: 600;
    color: var(--text-dark);
    text-align: center;
    margin: 20px 0;
}

.kanban-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
    flex-shrink: 0;
}

.logo {
    height: 45px;
    width: auto;
    margin-right: 20px;
    transition: opacity 0.3s ease;
}

body.dark-mode .logo {
    opacity: 0;
}

body.dark-mode .logo.dark-mode-logo {
    opacity: 1;
}

.header-controls {
    display: flex;
    align-items: center;
    gap: 10px;
}

.header-controls select {
    padding: 10px;
    border: 1px solid var(--light-gray);
    border-radius: 6px;
    font-size: 15px;
}

.header-buttons {
    display: flex;
    gap: 10px;
    align-items: center;
}

.add-card-btn, .add-responsible-btn {
    background: var(--primary-blue);
    color: var(--white-text);
    padding: 10px 18px;
    border-radius: 8px;
    border: none;
    cursor: pointer;
    font-size: 15px;
    font-weight: 500;
    transition: background 0.3s;
}

.add-responsible-btn {
    background: var(--secondary-blue);
}

.add-card-btn:hover {
    background: var(--primary-blue-hover);
}

.add-responsible-btn:hover {
    background: var(--secondary-blue-hover);
}

/* Estilo do botão de configurações como ícone */
.settings-btn {
    background: none;
    border: none;
    cursor: pointer;
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform 0.3s ease;
}

.settings-btn .bi-gear-fill {
    font-size: 24px;
    color: var(--secondary-blue);
    transition: color 0.3s ease, transform 0.3s ease;
}

.settings-btn:hover .bi-gear-fill {
    color: var(--secondary-blue-hover);
    transform: scale(1.2);
}

.settings-btn:active .bi-gear-fill {
    transform: scale(0.9);
}

/* Estilo do toggle switch para modo escuro */
.dark-mode-toggle {
    display: flex;
    align-items: center;
}

.dark-mode-checkbox {
    display: none;
}

.slider {
    position: relative;
    display: inline-block;
    width: 50px;
    height: 24px;
    background: var(--light-gray);
    border-radius: 24px;
    transition: background 0.3s;
}

.slider::before {
    position: absolute;
    content: "";
    height: 20px;
    width: 20px;
    left: 2px;
    top: 2px;
    background: var(--white);
    border-radius: 50%;
    transition: transform 0.3s;
}

.dark-mode-checkbox:checked + .slider {
    background: var(--gray);
}

.dark-mode-checkbox:checked + .slider::before {
    transform: translateX(26px);
}

.kanban-board {
    display: flex;
    gap: 15px;
    overflow-x: auto;
    overflow-y: hidden;
    padding: 15px 0;
    flex: 1;
    min-height: 0;
}

.kanban-board::-webkit-scrollbar {
    height: 8px;
}

.kanban-board::-webkit-scrollbar-track {
    background: var(--light-gray);
    border-radius: 4px;
}

.kanban-board::-webkit-scrollbar-thumb {
    background: var(--primary-blue);
    border-radius: 4px;
}

.kanban-board::-webkit-scrollbar-thumb:hover {
    background: var(--primary-blue-hover);
}

.kanban-column {
    background: var(--white);
    border-radius: 12px;
    box-shadow: 0 4px 20px var(--shadow-light);
    width: 300px;
    min-height: 400px;
    padding: 15px;
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
}

.kanban-column h2 {
    margin: 0 0 15px;
    font-size: 17px;
    font-weight: 600;
    color: var(--text-dark);
    text-align: center;
    background: var(--light-gray-bg);
    padding: 10px;
    border-radius: 8px;
}

.card-container {
    flex: 1;
    overflow-y: auto;
    max-height: calc(100vh - 200px);
    padding-right: 5px;
}

.card-container::-webkit-scrollbar {
    width: 6px;
}

.card-container::-webkit-scrollbar-track {
    background: var(--light-gray);
    border-radius: 3px;
}

.card-container::-webkit-scrollbar-thumb {
    background: var(--primary-blue);
    border-radius: 3px;
}

.card-container::-webkit-scrollbar-thumb:hover {
    background: var(--primary-blue-hover);
}

.kanban-card {
    background: var(--card-initial);
    border-radius: 10px;
    padding: 12px;
    margin-bottom: 10px;
    box-shadow: 0 2px 10px var(--shadow-light);
    cursor: grab;
    transition: transform 0.2s, box-shadow 0.2s;
}

.kanban-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 4px 15px var(--shadow-medium);
}

.kanban-card.warning {
    background: var(--card-warning);
}

.kanban-card.due-today {
    background: var(--card-due-today);
}

.kanban-card.overdue {
    background: var(--card-overdue);
}

.kanban-card h3 {
    margin: 0 0 8px;
    font-size: 15px;
    font-weight: 600;
    color: var(--primary-blue);
}

.kanban-card p {
    margin: 5px 0;
    font-size: 13px;
    color: var(--text-gray);
    line-height: 1.4;
}

.kanban-card .responsible {
    font-weight: 500;
    color: var(--text-medium);
}

.kanban-card .due-date {
    color: var(--danger-red);
    font-size: 12px;
    font-weight: 500;
}

.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--modal-overlay);
    justify-content: center;
    align-items: center;
    z-index: 1000;
    transition: opacity 0.3s ease;
}

.modal-content {
    background: var(--white);
    border-radius: 14px;
    padding: 20px;
    width: 420px;
    max-width: 90%;
    max-height: 85vh;
    overflow-y: auto;
    box-shadow: 0 6px 25px var(--shadow-dark);
    border: 1px solid var(--light-gray);
    transform: translateY(-20px);
    transition: transform 0.3s ease;
    position: relative;
}

.modal-content::-webkit-scrollbar {
    width: 6px;
}

.modal-content::-webkit-scrollbar-track {
    background: var(--off-white);
    border-radius: 3px;
}

.modal-content::-webkit-scrollbar-thumb {
    background: var(--primary-blue);
    border-radius: 3px;
}

.modal-content::-webkit-scrollbar-thumb:hover {
    background: var(--primary-blue-hover);
}

.modal-close-btn {
    position: absolute;
    top: 10px;
    right: 10px;
    font-size: 20px;
    color: var(--text-gray);
    cursor: pointer;
    transition: color 0.2s;
}

.modal-close-btn:hover {
    color: var(--danger-red);
}

.modal-content h2 {
    margin: 0 0 15px;
    font-size: 18px;
    font-weight: 600;
    color: var(--text-dark);
}

.modal-content p {
    margin: 0 0 15px;
    font-size: 14px;
    color: var(--text-gray);
}

.modal-content input,
.modal-content textarea,
.modal-content select {
    width: 100%;
    margin-bottom: 12px;
    padding: 10px;
    border: 1px solid var(--light-gray);
    border-radius: 6px;
    font-size: 14px;
}

.modal-content textarea {
    resize: vertical;
    min-height: 80px;
}

.modal-content button {
    background: var(--primary-blue);
    color: var(--white-text);
    padding: 10px;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 14px;
    width: 100%;
    transition: background 0.3s;
    margin-bottom: 7px;
}

.modal-content button:hover {
    background: var(--primary-blue-hover);
}

.modal-content .close-btn, .modal-content .cancel-btn {
    background: var(--danger-red);
    margin-top: 10px;
}

.modal-content .close-btn:hover, .modal-content .cancel-btn:hover {
    background: var(--danger-red-hover);
}

.modal-content .edit-buttons, .modal-content .confirm-buttons {
    display: flex;
    gap: 10px;
    margin-bottom: 10px;
    align-items: center;
    padding: 0;
    margin: 0;
}

.modal-content .edit-buttons button, .modal-content .confirm-buttons button {
    flex: 1;
    padding: 10px;
    line-height: 1.5;
    box-sizing: border-box;
}

.modal-content .confirm-buttons button {
    height: 42px;
    line-height: 42px;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0 15px;
    margin: 0;
    vertical-align: middle;
}

.modal-content .confirm-buttons .cancel-btn {
    background: var(--danger-red);
}

.modal-content .confirm-buttons .cancel-btn:hover {
    background: var(--danger-red-hover);
}

.modal-content .delete-btn {
    background: var(--danger-red);
}

.modal-content .delete-btn:hover {
    background: var(--danger-red-hover);
}

.settings-modal label {
    display: block;
    margin-bottom: 6px;
    font-size: 14px;
    font-weight: 500;
}

.settings-modal input[type="number"] {
    width: 100px;
}

.settings-modal input[type="color"] {
    width: 50px;
    height: 30px;
    padding: 0;
    border: none;
    cursor: pointer;
}

.settings-modal .column-section {
    margin-top: 15px;
    padding-top: 15px;
    border-top: 1px solid var(--light-gray);
}

.settings-modal .column-list {
    margin-bottom: 12px;
}

.settings-modal .column-item {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 10px;
    cursor: move;
}

.settings-modal .column-item input {
    flex: 1;
}

.settings-modal .column-item button {
    background: var(--danger-red);
    padding: 6px 12px;
    width: auto;
}

.settings-modal .column-item button:hover {
    background: var(--danger-red-hover);
}