/* =========================================
   1. VARIÁVEIS DE TEMA (CLARO/ESCURO)
   ========================================= */
:root {
    --bg-body: #eef2f7;
    --bg-card: rgba(255, 255, 255, 0.9);
    --text-main: #2d3436;
    --text-sec: #636e72;
    --primary: #4e73df;
    --primary-glow: rgba(78, 115, 223, 0.4);
    --danger: #ff4757;
    --success: #2ed573;
    --input-bg: #ffffff;
    --border: #d1d8e0;
    --btn-theme-bg: #efefef;
    --btn-theme-border: #767676;
}

body.dark {
    --bg-body: #0f172a;
    --bg-card: rgba(30, 41, 59, 0.7);
    --text-main: #f8fafc;
    --text-sec: #94a3b8;
    --primary: #3b82f6;
    --primary-glow: rgba(59, 130, 246, 0.5);
    --input-bg: #1e293b;
    --border: #334155;
    --btn-theme-bg: #2d3436;
    --btn-theme-border: #555555;
}

/* =========================================
   2. RESET E ESTRUTURA BASE
   ========================================= */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-body);
    color: var(--text-main);
    display: flex;
    justify-content: center;
    padding: 60px 20px;
    transition: background 0.4s, color 0.4s;
}

.container {
    background: var(--bg-card);
    backdrop-filter: blur(12px);
    width: 100%;
    max-width: 550px;
    padding: 2.5rem;
    border-radius: 24px;
    border: 1px solid var(--border);
    box-shadow: 0 20px 40px rgba(0,0,0,0.1);
}

/* =========================================
   3. HEADER E BOTÃO DE TEMA (MODO REFERÊNCIA)
   ========================================= */
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
}

#theme-toggle {
    all: unset; /* Remove estilos padrão de botão */
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 28px;
    cursor: pointer;
    font-size: 14px;
    transition: background 0.2s, transform 0.1s;
}

#theme-toggle:active {
    transform: scale(0.95);
}

/* =========================================
   4. INPUTS E ADICIONAR
   ========================================= */
.input-container {
    display: flex;
    flex-direction: column;
    gap: 15px;
    margin-bottom: 25px;
}

input {
    background: var(--input-bg);
    border: 1px solid var(--border);
    padding: 14px;
    border-radius: 12px;
    color: var(--text-main);
    outline: none;
    transition: 0.3s;
}

input:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 4px var(--primary-glow);
}

.datetime-group {
    display: flex;
    gap: 12px;
}

.datetime-group input {
    flex: 1;
}

#add-btn {
    background: var(--primary);
    color: white;
    border: none;
    border-radius: 12px;
    padding: 0 25px;
    font-weight: 700;
    cursor: pointer;
    transition: 0.3s;
}

#add-btn:hover {
    filter: brightness(1.1);
    transform: translateY(-1px);
}

/* =========================================
   5. FILTROS
   ========================================= */
.filters {
    display: flex;
    gap: 10px;
    margin-bottom: 30px;
    flex-wrap: wrap;
}

.filter-btn {
    background: transparent;
    border: 1px solid var(--border);
    padding: 8px 18px;
    border-radius: 50px;
    color: var(--text-sec);
    cursor: pointer;
    font-size: 0.85rem;
    transition: 0.3s;
}

.filter-btn.active {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
}

/* =========================================
   6. LISTA DE TAREFAS E ITENS
   ========================================= */
.todo-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 18px;
    background: rgba(255, 255, 255, 0.03);
    border-radius: 16px;
    margin-bottom: 12px;
    border: 1px solid var(--border);
    transition: 0.3s;
}

.task-info span {
    font-size: 1.05rem;
    font-weight: 500;
    display: block;
}

.task-info small {
    color: var(--text-sec);
    font-size: 0.8rem;
}

.todo-item.completed span {
    text-decoration: line-through;
    opacity: 0.5;
}

.todo-item.is-deleted {
    opacity: 0.6;
    filter: grayscale(0.8);
}

/* =========================================
   7. BOTÕES DE AÇÃO (CONCLUIR/EXCLUIR)
   ========================================= */
.task-actions {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.btn-action {
    padding: 6px 14px;
    border-radius: 8px;
    font-size: 0.7rem;
    font-weight: 800;
    cursor: pointer;
    border: none;
    transition: 0.2s;
    text-transform: uppercase;
    width: 100px;
}

.btn-complete {
    background: rgba(46, 213, 115, 0.1);
    color: var(--success);
    border: 1px solid var(--success);
}

.btn-complete:hover {
    background: var(--success);
    color: #fff;
}

.btn-delete {
    background: rgba(255, 71, 87, 0.1);
    color: var(--danger);
    border: 1px solid var(--danger);
}

.btn-delete:hover {
    background: var(--danger);
    color: #fff;
}