* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

:root {
    --bg-primary: #fdf2f8;
    --bg-secondary: #ffffff;
    --bg-calendar: #ffffff;
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --accent: #fbbf24;
    --accent-hover: #f59e0b;
    --border: #fce7f3;
    --todo-bg: #fef3f9;
    --todo-done: #d1d5db;
    --shadow: rgba(0, 0, 0, 0.05);
    --alert-bg: #fee2e2;
    --alert-text: #991b1b;
}

body.dark-mode {
    --bg-primary: #1a1a2e;
    --bg-secondary: #16213e;
    --bg-calendar: #0f3460;
    --text-primary: #e5e7eb;
    --text-secondary: #9ca3af;
    --accent: #ec4899;
    --accent-hover: #db2777;
    --border: #374151;
    --todo-bg: #1f2937;
    --todo-done: #4b5563;
    --shadow: rgba(0, 0, 0, 0.3);
    --alert-bg: #7f1d1d;
    --alert-text: #fecaca;
}

body {
    background: var(--bg-primary);
    color: var(--text-primary);
    display: flex;
    justify-content: center;
    padding: 20px;
    transition: background 0.3s ease, color 0.3s ease;
    min-height: 100vh;
}

.app {
    width: 100%;
    max-width: 900px;
}

/* Banner de Alerta */
.alert-banner {
    background: var(--alert-bg);
    color: var(--alert-text);
    padding: 15px 20px;
    border-radius: 12px;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 12px;
    animation: pulse 2s infinite;
    box-shadow: 0 4px 12px var(--shadow);
    font-weight: 600;
}

.alert-banner.hidden {
    display: none;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.02); }
}

/* Lista de Tarefas Pendentes */
.pending-tasks {
    background: var(--bg-secondary);
    padding: 20px;
    border-radius: 16px;
    margin-bottom: 20px;
    box-shadow: 0 4px 12px var(--shadow);
}

.pending-tasks.hidden {
    display: none;
}

.pending-tasks h3 {
    color: var(--accent);
    margin-bottom: 15px;
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.2rem;
}

.pending-task-item {
    background: var(--todo-bg);
    padding: 12px 15px;
    border-radius: 10px;
    margin-bottom: 10px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-left: 4px solid var(--accent);
    cursor: pointer;
    transition: all 0.2s;
}

.pending-task-item:hover {
    transform: translateX(5px);
    box-shadow: 0 2px 8px var(--shadow);
}

.pending-task-item.urgent {
    border-left-color: #ef4444;
    background: rgba(239, 68, 68, 0.1);
}

.task-info {
    flex: 1;
}

.task-date {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-top: 4px;
}

.task-time-badge {
    background: var(--accent);
    color: white;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
}

.task-time-badge.urgent {
    background: #ef4444;
    animation: blink 1s infinite;
}

@keyframes blink {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.7; }
}

.top-controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    gap: 15px;
    flex-wrap: wrap;
}

.view-toggle {
    display: flex;
    gap: 8px;
    background: var(--bg-secondary);
    padding: 4px;
    border-radius: 12px;
    box-shadow: 0 2px 8px var(--shadow);
}

.view-toggle button {
    padding: 8px 16px;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s;
    font-size: 0.9rem;
}

.view-toggle button.active {
    background: var(--accent);
    color: white;
}

.theme-toggle {
    background: var(--bg-secondary);
    border: none;
    padding: 10px 16px;
    border-radius: 12px;
    cursor: pointer;
    box-shadow: 0 2px 8px var(--shadow);
    font-size: 1.2rem;
    transition: transform 0.2s;
}

.theme-toggle:hover {
    transform: scale(1.05);
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    background: var(--bg-secondary);
    padding: 20px;
    border-radius: 16px;
    box-shadow: 0 4px 12px var(--shadow);
}

header h1 {
    font-size: 1.5rem;
    color: var(--text-primary);
    text-transform: capitalize;
}

.nav-btn {
    padding: 10px 18px;
    border: none;
    background: var(--accent);
    color: white;
    border-radius: 10px;
    cursor: pointer;
    font-size: 1rem;
    transition: all 0.2s;
    box-shadow: 0 2px 6px var(--shadow);
}

.nav-btn:hover {
    background: var(--accent-hover);
    transform: translateY(-2px);
}

#calendar {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 12px;
    margin-bottom: 25px;
}

#weekView {
    display: none;
    gap: 12px;
    margin-bottom: 25px;
}

#weekView.active {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
}

.week-header {
    background: var(--bg-secondary);
    padding: 12px;
    text-align: center;
    border-radius: 12px;
    font-weight: 600;
    font-size: 0.85rem;
    color: var(--text-secondary);
    box-shadow: 0 2px 6px var(--shadow);
}

.day {
    background: var(--bg-calendar);
    padding: 18px;
    border-radius: 12px;
    text-align: center;
    cursor: pointer;
    transition: all 0.2s;
    box-shadow: 0 2px 8px var(--shadow);
    position: relative;
    min-height: 60px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

.day:hover {
    background: var(--accent);
    color: white;
    transform: translateY(-3px);
    box-shadow: 0 4px 12px var(--shadow);
}

.day.inactive {
    opacity: 0.3;
}

.day.today {
    border: 2px solid var(--accent);
    font-weight: bold;
}

.day.has-todos::after {
    content: '●';
    position: absolute;
    bottom: 5px;
    font-size: 0.6rem;
    color: var(--accent);
}

/* Indicador de tarefas urgentes */
.day.has-urgent::after {
    color: #ef4444;
    animation: blink 1s infinite;
}

#todoPanel {
    background: var(--bg-secondary);
    padding: 25px;
    border-radius: 16px;
    box-shadow: 0 8px 24px var(--shadow);
    animation: slideUp 0.3s ease;
}

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

.hidden {
    display: none;
}

.todo-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    padding-bottom: 15px;
    border-bottom: 2px solid var(--border);
}

.todo-header h2 {
    color: var(--accent);
    font-size: 1.3rem;
}

.close-btn {
    background: transparent;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-secondary);
    padding: 5px 10px;
    border-radius: 8px;
    transition: all 0.2s;
}

.close-btn:hover {
    background: var(--border);
    color: var(--text-primary);
}

.todo-input {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
}

.todo-input input {
    flex: 1;
    padding: 14px;
    border: 2px solid var(--border);
    border-radius: 12px;
    font-size: 1rem;
    background: var(--bg-primary);
    color: var(--text-primary);
    transition: border 0.2s;
}

.todo-input input:focus {
    outline: none;
    border-color: var(--accent);
}

.todo-input button {
    padding: 14px 24px;
    background: var(--accent);
    color: white;
    border: none;
    border-radius: 12px;
    cursor: pointer;
    font-size: 1.2rem;
    transition: all 0.2s;
}

.todo-input button:hover {
    background: var(--accent-hover);
    transform: scale(1.05);
}

.notification-controls {
    display: flex;
    gap: 10px;
    margin-bottom: 15px;
    align-items: center;
    flex-wrap: wrap;
}

.notification-controls input[type="time"] {
    padding: 10px;
    border: 2px solid var(--border);
    border-radius: 10px;
    background: var(--bg-primary);
    color: var(--text-primary);
    font-size: 0.9rem;
}

.notification-controls button {
    padding: 10px 16px;
    background: var(--accent);
    color: white;
    border: none;
    border-radius: 10px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: all 0.2s;
}

#todoList li {
    list-style: none;
    padding: 15px;
    background: var(--todo-bg);
    border-radius: 12px;
    margin-bottom: 12px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    transition: all 0.2s;
    border: 2px solid transparent;
}

#todoList li:hover {
    border-color: var(--accent);
    transform: translateX(5px);
}

#todoList li.done {
    text-decoration: line-through;
    color: var(--text-secondary);
    background: var(--todo-done);
    opacity: 0.7;
}

.todo-time {
    font-size: 0.85rem;
    color: var(--accent);
    font-weight: 600;
    margin-left: 10px;
}

.delete-btn {
    background: #ef4444;
    color: white;
    border: none;
    padding: 6px 12px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 0.85rem;
    transition: all 0.2s;
}

.delete-btn:hover {
    background: #dc2626;
}

@media (max-width: 768px) {
    #calendar {
        gap: 8px;
    }
    
    .day {
        padding: 12px;
        font-size: 0.9rem;
    }

    header h1 {
        font-size: 1.2rem;
    }

    .top-controls {
        flex-direction: column;
        align-items: stretch;
    }

    .view-toggle {
        justify-content: center;
    }
}