/* ═══════════════════════════════════════════════════
   ABAJO EN EL AGUA — calculadora.css
   Estructura:
   1. Variables & Reset (hereda de style.css, se redefinen las necesarias)
   2. Topbar
   3. Layout principal (dos columnas)
   4. Sidebar — formulario
   5. Elementos de formulario
   6. Resultados
   7. Tarjetas KPI
   8. Alertas
   9. Tabla de plan de vuelo
   10. Animaciones
   11. Media Queries
═══════════════════════════════════════════════════ */


/* ─── 1. VARIABLES ─── */

:root {
    --color-navy:        #0D2C54;
    --color-navy-dark:   #081e3a;
    --color-cyan:        #00B4D8;
    --color-cyan-light:  #90E0EF;

    --color-bg:          #F5F7FA;
    --color-bg-alt:      #EEF2F7;
    --color-white:       #FFFFFF;

    --color-text:        #1A2B3C;
    --color-text-muted:  #6B7E93;

    --color-border:      #D6E1ED;
    --color-border-focus:#00B4D8;

    --color-ok:          #10b981;
    --color-ok-bg:       rgba(16, 185, 129, 0.08);
    --color-ok-border:   rgba(16, 185, 129, 0.25);

    --color-warn:        #f59e0b;
    --color-warn-bg:     rgba(245, 158, 11, 0.08);
    --color-warn-border: rgba(245, 158, 11, 0.25);

    --color-danger:      #ef4444;
    --color-danger-bg:   rgba(239, 68, 68, 0.08);
    --color-danger-border:rgba(239, 68, 68, 0.25);

    --font-display:      'Syne', sans-serif;
    --font-body:         'DM Sans', sans-serif;

    --topbar-height:     52px;
    --sidebar-width:     380px;

    --radius-sm:  6px;
    --radius-md:  10px;
    --radius-lg:  16px;

    --shadow-sm:  0 1px 4px rgba(13,44,84,0.07);
    --shadow-md:  0 4px 16px rgba(13,44,84,0.10);

    --transition-fast: 0.15s ease;
    --transition-base: 0.25s ease;
}

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

html { height: 100%; }

body {
    font-family: var(--font-body);
    font-size: 0.95rem;
    line-height: 1.6;
    color: var(--color-text);
    background: var(--color-bg);
    height: 100%;
    -webkit-font-smoothing: antialiased;
}

h1, h2, h3 {
    font-family: var(--font-display);
    font-weight: 800;
    letter-spacing: -0.02em;
    color: var(--color-navy);
    line-height: 1.15;
}

button, input, select {
    font-family: var(--font-body);
    font-size: inherit;
}


/* ─── 2. TOPBAR ─── */

.topbar {
    position: fixed;
    top: 0; left: 0; right: 0;
    z-index: 100;
    height: var(--topbar-height);
    background: rgba(245,247,250,0.95);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border);
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    align-items: center;
    padding-inline: 1.5rem;
    gap: 1rem;
}

.topbar-back {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--color-text-muted);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.topbar-back:hover { color: var(--color-navy); }

.topbar-back__arrow {
    font-size: 1rem;
    transition: transform var(--transition-fast);
}

.topbar-back:hover .topbar-back__arrow {
    transform: translateX(-3px);
}

.topbar-logo {
    display: flex;
    align-items: center;
    gap: 8px;
    text-decoration: none;
    justify-content: center;
}

.topbar-logo__img {
    width: 26px;
    height: 26px;
    object-fit: contain;
}

.topbar-logo__text {
    font-family: var(--font-display);
    font-weight: 800;
    font-size: 1.5rem;
    color: var(--color-navy);
    white-space: nowrap;
}

.topbar-disclaimer {
    font-size: 0.7rem;
    color: var(--color-text-muted);
    text-align: right;
    line-height: 1.4;
}


/* ─── 3. LAYOUT PRINCIPAL ─── */

.calc-layout {
    display: grid;
    grid-template-columns: var(--sidebar-width) 1fr;
    min-height: 100vh;
    padding-top: var(--topbar-height);
}


/* ─── 4. SIDEBAR ─── */

.calc-sidebar {
    background: var(--color-white);
    border-right: 1px solid var(--color-border);
    overflow-y: auto;
    position: sticky;
    top: var(--topbar-height);
    height: calc(100vh - var(--topbar-height));
}

.calc-sidebar__header {
    padding: 1.5rem 1.5rem 1rem;
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    background: var(--color-white);
    z-index: 10;
}

.calc-sidebar__title {
    font-size: 1.2rem;
    margin-bottom: 2px;
}

.calc-sidebar__subtitle {
    font-size: 0.75rem;
    color: var(--color-text-muted);
    font-weight: 400;
}

.calc-form {
    padding: 1.25rem 1.5rem 2rem;
    display: flex;
    flex-direction: column;
    gap: 0;
}


/* ─── 5. ELEMENTOS DE FORMULARIO ─── */

.form-group {
    border: none;
    padding: 0;
    margin-bottom: 1.1rem;
}

.form-label {
    display: block;
    font-size: 0.78rem;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 0.4rem;
    letter-spacing: 0.01em;
}

.form-help {
    display: block;
    font-size: 0.7rem;
    color: var(--color-text-muted);
    margin-top: 0.3rem;
    line-height: 1.4;
}

.form-select,
.form-input {
    width: 100%;
    background: var(--color-bg);
    border: 1.5px solid var(--color-border);
    border-radius: var(--radius-sm);
    padding: 0.55rem 0.75rem;
    color: var(--color-text);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
    appearance: none;
    -webkit-appearance: none;
}

.form-select {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%236B7E93' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 0.75rem center;
    padding-right: 2rem;
    cursor: pointer;
}

.form-select:focus,
.form-input:focus {
    outline: none;
    border-color: var(--color-cyan);
    box-shadow: 0 0 0 3px rgba(0,180,216,0.12);
}

.form-select:disabled,
.form-input:disabled {
    opacity: 0.45;
    cursor: not-allowed;
    background: var(--color-bg-alt);
}

/* Input con unidad */
.form-input-unit {
    display: flex;
    align-items: stretch;
    border: 1.5px solid var(--color-border);
    border-radius: var(--radius-sm);
    overflow: hidden;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-input-unit:focus-within {
    border-color: var(--color-cyan);
    box-shadow: 0 0 0 3px rgba(0,180,216,0.12);
}

.form-input-unit .form-input {
    border: none;
    border-radius: 0;
    flex: 1;
    box-shadow: none !important;
}

.form-input-unit .form-input:focus {
    border: none;
    box-shadow: none;
}

.form-unit {
    background: var(--color-bg-alt);
    border-left: 1.5px solid var(--color-border);
    padding: 0 0.75rem;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--color-text-muted);
    display: flex;
    align-items: center;
    flex-shrink: 0;
    letter-spacing: 0.03em;
}

/* Fila de dos inputs (intervalo horas/min) */
.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.75rem;
}

/* Divider */
.form-divider {
    height: 1px;
    background: var(--color-border);
    margin: 0.5rem 0 1.25rem;
}

/* Sección con título */
.form-section {
    margin-bottom: 0.5rem;
}

.form-section__title {
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--color-navy);
    margin-bottom: 1rem;
    padding-bottom: 0.35rem;
    border-bottom: 2px solid var(--color-cyan);
    display: inline-block;
}

/* Botón submit */
.calc-submit {
    width: 100%;
    background: var(--color-navy);
    color: var(--color-white);
    border: none;
    border-radius: var(--radius-md);
    padding: 0.9rem 1.5rem;
    font-weight: 600;
    font-size: 0.95rem;
    cursor: pointer;
    transition: background var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
    margin-top: 0.5rem;
    letter-spacing: 0.01em;
}

.calc-submit:hover {
    background: var(--color-cyan);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.calc-submit:active { transform: translateY(0); }

.calc-submit:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

/* Campo oculto dinámicamente */
.form-group.is-hidden {
    display: none;
}

/* Wrapper repetitivo desactivado */
#repetitive-wrapper.is-disabled {
    opacity: 0.45;
    pointer-events: none;
}


/* ─── 6. RESULTADOS ─── */

.calc-results {
    padding: 2rem;
    overflow-y: auto;
}

/* Estado vacío */
.results-empty {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 60vh;
    gap: 1rem;
    text-align: center;
}

.results-empty__icon { font-size: 3.5rem; }

.results-empty__text {
    font-size: 0.95rem;
    color: var(--color-text-muted);
    max-width: 280px;
    line-height: 1.6;
}

/* Loader */
.results-loader {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 60vh;
    gap: 1rem;
    color: var(--color-text-muted);
    font-size: 0.875rem;
}

.results-loader.hidden { display: none; }

.loader-spinner {
    width: 36px;
    height: 36px;
    border: 3px solid var(--color-border);
    border-top-color: var(--color-cyan);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Contenedor de resultados */
.results-content {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

/* Sección de resultados */
.results-section {
    animation: fadeInUp 0.4s ease both;
}

.results-section__title {
    font-size: 1rem;
    font-weight: 700;
    color: var(--color-navy);
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--color-border);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.results-section__title .section-badge {
    font-size: 0.65rem;
    font-weight: 600;
    color: var(--color-text-muted);
    background: var(--color-bg-alt);
    border: 1px solid var(--color-border);
    border-radius: 100px;
    padding: 2px 10px;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    font-family: var(--font-body);
}


/* ─── 7. TARJETAS KPI ─── */

.kpi-grid {
    display: grid;
    gap: 0.875rem;
}

.kpi-grid--3 { grid-template-columns: repeat(3, 1fr); }
.kpi-grid--2 { grid-template-columns: repeat(2, 1fr); }
.kpi-grid--auto { grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); }

.kpi-card {
    background: var(--color-white);
    border: 1.5px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 1rem;
    transition: box-shadow var(--transition-base), transform var(--transition-base);
}

.kpi-card:hover {
    box-shadow: var(--shadow-sm);
    transform: translateY(-1px);
}

.kpi-card__label {
    font-size: 0.65rem;
    font-weight: 600;
    letter-spacing: 0.07em;
    text-transform: uppercase;
    color: var(--color-text-muted);
    margin-bottom: 0.4rem;
    line-height: 1.3;
}

.kpi-card__value {
    font-family: var(--font-display);
    font-size: 1.4rem;
    font-weight: 800;
    color: var(--color-navy);
    line-height: 1.1;
    letter-spacing: -0.02em;
}

.kpi-card__sub {
    font-size: 0.7rem;
    color: var(--color-text-muted);
    margin-top: 0.2rem;
}

/* Colores de estado en el valor */
.kpi-ok     { color: var(--color-ok); }
.kpi-warn   { color: var(--color-warn); }
.kpi-danger { color: var(--color-danger); }

/* Borde de color en la card según estado */
.kpi-card--ok     { border-color: var(--color-ok-border);     background: var(--color-ok-bg); }
.kpi-card--warn   { border-color: var(--color-warn-border);   background: var(--color-warn-bg); }
.kpi-card--danger { border-color: var(--color-danger-border); background: var(--color-danger-bg); }


/* ─── 8. ALERTAS ─── */

.alert {
    border-radius: var(--radius-md);
    padding: 0.875rem 1rem;
    font-size: 0.85rem;
    line-height: 1.5;
    border: 1.5px solid transparent;
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
}

.alert__icon { font-size: 1.1rem; flex-shrink: 0; margin-top: 1px; }

.alert--danger {
    background: var(--color-danger-bg);
    border-color: var(--color-danger-border);
    color: #c0392b;
}

.alert--warn {
    background: var(--color-warn-bg);
    border-color: var(--color-warn-border);
    color: #92610a;
}

.alert--info {
    background: rgba(0,180,216,0.07);
    border-color: rgba(0,180,216,0.25);
    color: #0a6880;
}

.alerts-stack {
    display: flex;
    flex-direction: column;
    gap: 0.625rem;
}


/* ─── 9. TABLA DE PLAN DE VUELO ─── */

.flight-plan {
    border: 1.5px solid var(--color-border);
    border-radius: var(--radius-md);
    overflow: hidden;
}

.flight-plan summary {
    padding: 0.75rem 1rem;
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--color-navy);
    cursor: pointer;
    user-select: none;
    background: var(--color-bg-alt);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    list-style: none;
    transition: background var(--transition-fast);
}

.flight-plan summary:hover { background: var(--color-border); }

.flight-plan summary::before {
    content: '▶';
    font-size: 0.6rem;
    color: var(--color-cyan);
    transition: transform var(--transition-fast);
}

.flight-plan[open] summary::before { transform: rotate(90deg); }

.flight-plan__table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.8rem;
}

.flight-plan__table thead th {
    background: var(--color-bg);
    padding: 0.6rem 0.875rem;
    text-align: left;
    font-size: 0.65rem;
    font-weight: 700;
    letter-spacing: 0.07em;
    text-transform: uppercase;
    color: var(--color-text-muted);
    border-bottom: 1px solid var(--color-border);
}

.flight-plan__table tbody td {
    padding: 0.6rem 0.875rem;
    border-bottom: 1px solid var(--color-border);
    color: var(--color-text);
}

.flight-plan__table tbody tr:last-child td { border-bottom: none; }

.flight-plan__table tbody tr:hover { background: var(--color-bg-alt); }

.flight-plan__table tfoot td {
    padding: 0.6rem 0.875rem;
    font-weight: 700;
    font-family: var(--font-display);
    background: var(--color-bg);
    border-top: 2px solid var(--color-border);
    color: var(--color-navy);
}

/* Detalle de repetitivo */
.repetitive-detail {
    background: var(--color-bg-alt);
    border: 1.5px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 1rem;
}

.repetitive-detail__row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.4rem 0;
    border-bottom: 1px solid var(--color-border);
    font-size: 0.82rem;
}

.repetitive-detail__row:last-child { border-bottom: none; }

.repetitive-detail__label { color: var(--color-text-muted); }
.repetitive-detail__value { font-weight: 600; color: var(--color-navy); }


/* ─── 10. ANIMACIONES ─── */

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(12px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.results-section:nth-child(1) { animation-delay: 0s; }
.results-section:nth-child(2) { animation-delay: 0.08s; }
.results-section:nth-child(3) { animation-delay: 0.16s; }
.results-section:nth-child(4) { animation-delay: 0.24s; }
.results-section:nth-child(5) { animation-delay: 0.32s; }


/* ─── 11. MEDIA QUERIES ─── */

/* Tablet */
@media (max-width: 900px) {
    :root {
        --sidebar-width: 320px;
    }

    .kpi-grid--3 { grid-template-columns: repeat(2, 1fr); }
    .topbar-disclaimer { display: none; }
}

/* Mobile */
@media (max-width: 650px) {
    .calc-layout {
        grid-template-columns: 1fr;
        grid-template-rows: auto auto;
    }

    .calc-sidebar {
        position: static;
        height: auto;
        overflow: visible;
        border-right: none;
        border-bottom: 1px solid var(--color-border);
    }

    .calc-results {
        padding: 1.25rem;
    }

    .kpi-grid--3,
    .kpi-grid--2 {
        grid-template-columns: 1fr 1fr;
    }

    .topbar {
        grid-template-columns: auto 1fr;
    }

    .topbar-disclaimer { display: none; }
    .topbar-logo { justify-content: flex-end; }
}

@media (max-width: 400px) {
    .kpi-grid--3,
    .kpi-grid--2,
    .kpi-grid--auto {
        grid-template-columns: 1fr;
    }
}