* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary: #4a90d9;
    --primary-dark: #357abd;
    --success: #5cb85c;
    --danger: #d9534f;
    --bg: #f5f7fa;
    --card: #ffffff;
    --text: #333333;
    --text-light: #888888;
    --border: #e0e0e0;
    --radius: 12px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    overflow-x: hidden;
}

.hidden { display: none !important; }

/* Login */
.login-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    padding: 2rem;
    text-align: center;
}
.login-container h1 { font-size: 2.5rem; margin-bottom: 0.5rem; }
.login-container p { color: var(--text-light); margin-bottom: 2rem; font-size: 1.1rem; }

.btn-google {
    display: inline-block;
    background: var(--primary);
    color: white;
    padding: 14px 32px;
    border-radius: var(--radius);
    text-decoration: none;
    font-size: 1.1rem;
    font-weight: 600;
    transition: background 0.2s;
}
.btn-google:hover { background: var(--primary-dark); }

/* Header */
header {
    display: flex;
    align-items: center;
    padding: 16px 20px;
    background: var(--card);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 100;
}
header h1, header h2 { flex: 1; font-size: 1.3rem; }
.btn-back {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    margin-right: 12px;
    padding: 4px 8px;
}
.btn-icon {
    background: none;
    border: none;
    font-size: 1.3rem;
    cursor: pointer;
    padding: 4px 8px;
}

/* Tiles */
.tiles {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    padding: 24px 20px;
    max-width: 500px;
    margin: 0 auto;
}
.tile {
    background: var(--card);
    border-radius: var(--radius);
    padding: 32px 16px;
    text-align: center;
    cursor: pointer;
    box-shadow: 0 2px 8px rgba(0,0,0,0.06);
    transition: transform 0.15s, box-shadow 0.15s;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
}
.tile:hover { transform: translateY(-2px); box-shadow: 0 4px 16px rgba(0,0,0,0.1); }
.tile:active { transform: scale(0.97); }
.tile-icon { font-size: 2.5rem; }
.tile-label { font-size: 1rem; font-weight: 600; color: var(--text); }

/* Forms */
.add-form {
    padding: 16px 20px;
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    background: var(--card);
    border-bottom: 1px solid var(--border);
}
.add-form input[type="text"],
.add-form input[type="email"],
.add-form input[type="date"],
.add-form input[type="datetime-local"] {
    flex: 1;
    min-width: 150px;
    padding: 12px 16px;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 1rem;
    outline: none;
}
.add-form input:focus { border-color: var(--primary); }
.btn {
    padding: 12px 20px;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.2s;
}
.btn:hover { background: var(--primary-dark); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }

.btn-heart {
    background: none;
    border: none;
    font-size: 1.2rem;
    cursor: pointer;
    padding: 4px 8px;
    transition: transform 0.15s;
}
.btn-heart:hover { transform: scale(1.2); }

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 8px;
    width: 100%;
    padding: 4px 0;
    font-size: 0.9rem;
}
.checkbox-label input[type="checkbox"] { width: 18px; height: 18px; }

/* Lists */
.item-list {
    list-style: none;
    padding: 8px 20px;
}
.item-list li {
    padding: 14px 16px;
    background: var(--card);
    margin-bottom: 8px;
    border-radius: 8px;
    box-shadow: 0 1px 4px rgba(0,0,0,0.04);
    display: flex;
    align-items: center;
    gap: 12px;
}
.item-list li.checked {
    opacity: 0.5;
    text-decoration: line-through;
}
.item-list li .item-text { flex: 1; }
.item-list li .item-meta {
    font-size: 0.75rem;
    color: var(--text-light);
}
.item-list li .item-delete {
    background: none;
    border: none;
    color: var(--danger);
    cursor: pointer;
    font-size: 1.2rem;
    padding: 4px;
}

/* Members specific */
.member-status {
    display: inline-block;
    padding: 2px 8px;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 600;
}
.member-status.joined { background: #d4edda; color: #155724; }
.member-status.pending { background: #fff3cd; color: #856404; }

/* Responsive */
@media (max-width: 400px) {
    .tiles { gap: 12px; padding: 16px; }
    .tile { padding: 24px 12px; }
    .tile-icon { font-size: 2rem; }
}