/* --- VARIABLES Y ESTILOS GLOBALES --- */
:root {
    --primary-blue: #00aeff;
    --primary-blue-light: #61daff;
    --primary-blue-dark: #008fcc;
    --dark-bg: #1a1c20;
    --card-bg: #25282e;
    --card-bg-gradient: linear-gradient(145deg, #2a2d34, #212429);
    --text-color: #f0f0f0;
    --text-muted: #a0a0a0;
    --green-accent: #28a745;
    --red-accent: #dc3545;
    --orange-accent: #fd7e14;
    --border-color: #3a3f4b;
    --shadow-color: rgba(0, 0, 0, 0.2);
    --font-family: 'Poppins', sans-serif;
    font-style: yellow;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { font-family: var(--font-family); background-color: var(--dark-bg); background-image: radial-gradient(circle at 15% 15%, rgba(0, 174, 255, 0.1), transparent 30%), radial-gradient(circle at 85% 75%, rgba(0, 143, 204, 0.1), transparent 40%); color: var(--text-color); line-height: 1.6; font-size: 16px; transition: background-color 0.3s; }
body.modal-open { overflow: hidden; }
.container { width: 90%; max-width: 1400px; margin: 0 auto; padding: 0 15px; }
h1, h2, h3, h4, h5, h6 { font-weight: 600; line-height: 1.2; }
a { color: var(--primary-blue); text-decoration: none; transition: color 0.3s ease; }
a:hover { color: var(--primary-blue-light); }

/* --- HEADER Y CONTENIDO PRINCIPAL --- */
header, main, footer { transition: opacity 0.5s ease-in-out; }
header { background-color: var(--card-bg); padding: 1rem 0; border-bottom: 1px solid var(--border-color); position: sticky; top: 0; z-index: 1000; box-shadow: 0 2px 10px var(--shadow-color); }
header .container { display: flex; justify-content: space-between; align-items: center; }
header h1 { font-size: 1.5rem; color: var(--primary-blue); display: flex; align-items: center; gap: 10px; }
#hamburger-menu { display: none; background: none; border: none; color: var(--text-color); font-size: 1.5rem; cursor: pointer; }
main.container { padding-top: 2rem; padding-bottom: 2rem; display: flex; flex-direction: column; gap: 2.5rem; }

/* --- DASHBOARD, CHART, CARDS --- */
.dashboard-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 1.5rem; }
.summary-card { background: var(--card-bg-gradient); padding: 1.5rem; border-radius: 12px; border: 1px solid var(--border-color); box-shadow: 0 4px 15px var(--shadow-color); transition: transform 0.3s ease, box-shadow 0.3s ease; }
.summary-card:hover { box-shadow: 0 8px 25px rgba(0, 174, 255, 0.1); }
.summary-card h3 { font-size: 1rem; color: var(--text-muted); font-weight: 400; margin-bottom: 0.5rem; }
.summary-card p { font-size: 2rem; font-weight: 700; color: var(--primary-blue-light); }
#chart-container { background: var(--card-bg-gradient); padding: 2rem; border-radius: 12px; border: 1px solid var(--border-color); box-shadow: 0 4px 15px var(--shadow-color); }
#expensesChart { max-height: 400px; width: 100% !important; }
#months-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(380px, 1fr)); gap: 1.5rem; }
.month-card { background: var(--card-bg-gradient); border-radius: 12px; border: 1px solid var(--border-color); box-shadow: 0 4px 15px var(--shadow-color); transition: all 0.4s ease; display: flex; flex-direction: column; }
.month-card-content { padding: 1.5rem; flex-grow: 1; display: flex; flex-direction: column; transition: opacity 0.3s ease-in-out; }
.month-card-content.fade-out { opacity: 0; }
.display-view .header, .placeholder-view .header { display: flex; justify-content: space-between; align-items: center; border-bottom: 1px solid var(--border-color); padding-bottom: 1rem; margin-bottom: 1rem; }
.display-view h2, .placeholder-view h2 { font-size: 1.5rem; color: var(--text-color); }
.display-view .total-spent { font-size: 1.25rem; font-weight: 700; color: var(--red-accent); }
.display-view .summary { margin-bottom: 1rem; }
.display-view .summary p { display: flex; justify-content: space-between; }
.display-view .summary strong { color: var(--primary-blue-light); }
.display-view .expense-list { list-style: none; max-height: 150px; overflow-y: auto; padding-right: 10px; margin-bottom: 1rem; }
.display-view .expense-list li { display: flex; justify-content: space-between; padding: 0.5rem 0; border-bottom: 1px solid #333; }
.placeholder-view { text-align: center; display: flex; flex-direction: column; justify-content: center; align-items: center; min-height: 250px; cursor: pointer; }
.placeholder-view:hover { border-color: var(--primary-blue); box-shadow: 0 8px 25px rgba(0, 174, 255, 0.1); }
.placeholder-view i { font-size: 3rem; color: var(--primary-blue); margin-bottom: 1rem; }
.budget-info { margin-bottom: 1.5rem; }
.budget-info p { font-size: 0.9rem; color: var(--text-muted); }
.budget-progress-bar { width: 100%; height: 12px; background-color: var(--border-color); border-radius: 6px; overflow: hidden; margin-top: 0.5rem; }
.budget-progress-fill { height: 100%; background-color: var(--green-accent); border-radius: 6px; transition: width 0.5s ease-out; }
.budget-progress-fill.warning { background-color: var(--orange-accent); }
.budget-progress-fill.over-budget { background-color: var(--red-accent); }
.form-view .header { display: flex; justify-content: space-between; align-items: flex-start; padding-bottom: 1rem; margin-bottom: 1rem; }
.form-view h2 { font-size: 1.5rem; margin-bottom: 1rem; }
.form-view .balance-display { text-align: right; }
.form-view .balance-display span { font-size: 0.8rem; text-transform: uppercase; color: var(--text-muted); }
.form-view .balance-display strong { font-size: 1.5rem; display: block; }
.form-view .income-section { margin-bottom: 1rem; }
.form-view label { font-weight: 600; margin-bottom: 0.5rem; display: block; }
.form-view .expenses-header { display: grid; grid-template-columns: 2fr 1fr auto; gap: 1rem; padding-bottom: 0.5rem; font-weight: 600; color: var(--text-muted); }
.form-view .expense-items-container { max-height: 200px; overflow-y: auto; padding-right: 10px; }
.form-view .expense-row { display: grid; grid-template-columns: 2fr 1fr auto; gap: 1rem; align-items: center; margin-bottom: 0.75rem; }
.month-card-footer { padding: 1rem 1.5rem; background-color: rgba(0,0,0,0.2); border-top: 1px solid var(--border-color); display: flex; justify-content: flex-end; gap: 1rem; align-items: center; }

/* --- INPUTS Y BOTONES --- */
input[type="text"], input[type="number"], input[type="password"] { width: 100%; background-color: var(--dark-bg); border: 1px solid var(--border-color); color: var(--text-color); padding: 0.75rem 1rem; border-radius: 6px; font-family: var(--font-family); font-size: 1rem; transition: border-color 0.3s ease, box-shadow 0.3s ease; }
input[type="text"]:focus, input[type="number"]:focus, input[type="password"]:focus { outline: none; border-color: var(--primary-blue); box-shadow: 0 0 0 3px rgba(0, 174, 255, 0.25); }
.btn { padding: 0.7rem 1.4rem; border: none; border-radius: 6px; font-family: var(--font-family); font-size: 0.9rem; font-weight: 600; cursor: pointer; transition: all 0.3s ease; display: inline-flex; align-items: center; gap: 8px; }
.btn-save { background-color: var(--primary-blue); color: #fff; }
.btn-save:hover { background-color: var(--primary-blue-dark); box-shadow: 0 4px 15px rgba(0, 174, 255, 0.3); transform: translateY(-2px); }
.btn-edit { background-color: transparent; color: var(--primary-blue); border: 1px solid var(--primary-blue); }
.btn-edit:hover { background-color: var(--primary-blue); color: #fff; }
.btn-cancel { background-color: var(--card-bg); color: var(--text-muted); border: 1px solid var(--border-color); }
.btn-cancel:hover { background-color: var(--border-color); color: var(--text-color); }
.btn-add-row { background-color: transparent; color: var(--primary-blue); border: 1px dashed var(--primary-blue); width: 100%; justify-content: center; margin-top: 0.5rem; padding: 0.5rem; }
.btn-add-row:hover { background-color: rgba(0, 174, 255, 0.1); }
.btn-remove-row { background: none; border: none; color: var(--text-muted); font-size: 1rem; cursor: pointer; padding: 5px; }
.btn-remove-row:hover { color: var(--red-accent); }
.btn-delete { background-color: var(--red-accent); color: #fff; margin-right: auto; }
.btn-delete:hover { background-color: #a71d2a; transform: translateY(-2px); box-shadow: 0 4px 15px rgba(220, 53, 69, 0.3); }

/* --- FOOTER GENERAL --- */
footer { text-align: center; padding: 2rem 0; margin-top: 2rem; border-top: 1px solid var(--border-color); color: var(--text-muted); font-size: 0.9rem; }

/* --- NOTIFICACIONES TOAST --- */
#toast-container { position: fixed; bottom: 20px; right: 20px; z-index: 2000; display: flex; flex-direction: column; gap: 10px; }
.toast { padding: 15px 20px; border-radius: 8px; color: #fff; font-weight: 600; box-shadow: 0 4px 15px rgba(0,0,0,0.3); opacity: 0; transform: translateX(110%); animation: slideIn 0.5s cubic-bezier(0.25, 0.46, 0.45, 0.94) forwards; }
.toast.success { background-color: var(--green-accent); }
.toast.error { background-color: var(--red-accent); }
@keyframes slideIn { to { opacity: 1; transform: translateX(0); } }
@keyframes slideOut { from { opacity: 1; transform: translateX(0); } to { opacity: 0; transform: translateX(110%); } }

/* --- MODALES (CONTRASEÑA Y CONFIRMACIÓN) --- */
.modal-overlay { position: fixed; top: 0; left: 0; width: 100%; height: 100%; background-color: rgba(0, 0, 0, 0.7); display: flex; justify-content: center; align-items: center; z-index: 3000; opacity: 1; transition: opacity 0.3s ease; backdrop-filter: blur(5px); }
.modal-overlay.hidden { opacity: 0; pointer-events: none; }
.modal-content { background: var(--card-bg-gradient); padding: 2rem; border-radius: 12px; border: 1px solid var(--border-color); box-shadow: 0 10px 30px rgba(0,0,0,0.5); width: 90%; max-width: 500px; text-align: center; transform: scale(1); transition: transform 0.3s ease; }
.modal-overlay.hidden .modal-content { transform: scale(0.95); }
.modal-content h3 { font-size: 1.5rem; margin-bottom: 1rem; color: var(--primary-blue-light); }
.modal-content p { color: var(--text-muted); margin-bottom: 1.5rem; }
.modal-actions { display: flex; justify-content: center; gap: 1rem; margin-top: 1.5rem; }
.hidden { display: none; opacity: 0; }
.error-message { color: var(--red-accent); font-size: 0.9rem; font-weight: 600; margin-top: 1rem; }
#password-modal input { text-align: center; font-size: 1.2rem; }

/* NUEVO: Animación de "sacudida" para error */
@keyframes shake { 10%, 90% { transform: translate3d(-1px, 0, 0); } 20%, 80% { transform: translate3d(2px, 0, 0); } 30%, 50%, 70% { transform: translate3d(-4px, 0, 0); } 40%, 60% { transform: translate3d(4px, 0, 0); } }
.shake { animation: shake 0.82s cubic-bezier(.36,.07,.19,.97) both; }

/* --- RESPONSIVIDAD --- */
@media (max-width: 992px) { .dashboard-grid { grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); } #months-grid { grid-template-columns: 1fr; } }
@media (max-width: 768px) { body { font-size: 15px; } .container { width: 95%; } #hamburger-menu { display: block; } }
@media (max-width: 480px) { .form-view .expense-row { grid-template-columns: 1fr; gap: 0.5rem; position: relative; } .form-view .expense-row .btn-remove-row { position: absolute; top: 0; right: 0; } }