/* ─────────────────────────────────────────────────────────────────────────────
   Calculadora Sostenible ITB — Stylesheet
   Sections:
     1. Design tokens
     2. Reset & base
     3. Layout
     4. Controls
     5. Result cards
     6. Saving badges & reduction animations
     7. Roadmap / CE section
     8. Accessibility utilities
     9. Error state
    10. Responsive
    11. Motion preferences
   ───────────────────────────────────────────────────────────────────────────── */

/* ── 1. Design Tokens ─────────────────────────────────────────────────────── */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;600;700;800&display=swap');

:root {
    --color-primary:        #2e7d32;
    --color-primary-light:  #4caf50;
    --color-primary-dark:   #1b5e20;
    --color-primary-ghost:  rgba(46, 125, 50, 0.10);

    --color-electricitat:   #f39c12;
    --color-aigua:          #3498db;
    --color-oficina:        #9b59b6;
    --color-neteja:         #1abc9c;

    --color-bg:             #eef2ef;
    --color-surface:        #ffffff;
    --color-surface-2:      #f8faf8;
    --color-text:           #1a1a1a;
    --color-text-muted:     #5a6672;
    --color-border:         #e0e7e0;

    /* Saving / reduction palette */
    --color-saving:         #27ae60;
    --color-saving-bg:      #eafaf1;
    --color-saving-text:    #1a6b3c;
    --color-strikethrough:  #c0392b;

    /* CE principle colours */
    --color-reduce:         #e74c3c;
    --color-reuse:          #e67e22;
    --color-recycle:        #2ecc71;

    /* State */
    --color-error-bg:       #fdecea;
    --color-error-text:     #c0392b;
    --color-inactive:       #95a5a6;
    --color-success:        #27ae60;

    --space-xs:   0.4rem;
    --space-sm:   0.8rem;
    --space-md:   1.2rem;
    --space-lg:   1.8rem;
    --space-xl:   2.4rem;
    --space-2xl:  3.2rem;

    --radius-sm:    6px;
    --radius-md:    12px;
    --radius-lg:    18px;
    --shadow-card:  0 4px 20px rgba(0, 0, 0, 0.07);
    --shadow-hover: 0 8px 28px rgba(0, 0, 0, 0.12);
    --transition:   0.28s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ── 2. Reset & Base ──────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

body {
    font-family: 'Inter', sans-serif;
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
}

/* ── 3. Layout ────────────────────────────────────────────────────────────── */
.main-header {
    background: linear-gradient(140deg, var(--color-primary-dark) 0%, #388e3c 55%, var(--color-primary-light) 100%);
    color: white;
    padding: var(--space-xl) var(--space-md) calc(var(--space-2xl) + 2.5rem);
    text-align: center;
}

.header-badge {
    display: inline-block;
    background: rgba(255,255,255,0.18);
    border: 1px solid rgba(255,255,255,0.35);
    border-radius: 999px;
    padding: 0.2rem 0.9rem;
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    margin-bottom: var(--space-sm);
}

.header-content h1 {
    font-size: clamp(1.5rem, 4vw, 2.4rem);
    font-weight: 800;
    margin-bottom: 0.4rem;
}

.header-content p { font-size: 1rem; opacity: 0.88; }

.dashboard {
    max-width: 1280px;
    margin: -2.5rem auto var(--space-lg);
    padding: 0 var(--space-md);
    position: relative;
    z-index: 10;
}

/* ── 4. Controls ──────────────────────────────────────────────────────────── */
.panel-control {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(100%, 380px), 1fr));
    gap: var(--space-md);
    margin-bottom: var(--space-lg);
}

.control-box {
    background: var(--color-surface);
    padding: var(--space-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-card);
}

.control-box h2 {
    color: var(--color-primary);
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: var(--space-md);
    padding-bottom: var(--space-sm);
    border-bottom: 2px solid var(--color-border);
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.select-label {
    display: block;
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--color-text-muted);
    margin-bottom: 0.3rem;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.selector-grup {
    display: flex;
    gap: var(--space-sm);
    align-items: flex-end;
    flex-wrap: wrap;
}

.modern-select {
    flex: 1;
    min-width: 0;
    padding: 0.7rem 0.9rem;
    border: 1.5px solid var(--color-border);
    border-radius: var(--radius-md);
    font-size: 0.95rem;
    font-family: inherit;
    background: var(--color-surface-2);
    color: var(--color-text);
    cursor: pointer;
    transition: border-color var(--transition), box-shadow var(--transition);
}

.modern-select:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(46, 125, 50, 0.2);
}

.variability-note {
    margin-top: var(--space-md);
    font-size: 0.82rem;
    color: var(--color-text-muted);
    background: var(--color-primary-ghost);
    padding: 0.5rem 0.8rem;
    border-radius: var(--radius-sm);
    display: flex;
    gap: 0.4rem;
    align-items: flex-start;
}

.reduccio-desc {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    margin-bottom: var(--space-md);
    line-height: 1.5;
}

/* Buttons */
button {
    cursor: pointer;
    border: none;
    border-radius: var(--radius-md);
    padding: 0.72rem 1.3rem;
    font-size: 0.95rem;
    font-weight: 700;
    font-family: inherit;
    transition: background-color var(--transition), transform var(--transition), box-shadow var(--transition);
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    min-height: 44px;
    white-space: nowrap;
}

button:focus-visible {
    outline: 3px solid var(--color-primary);
    outline-offset: 3px;
}

.btn-primari { background: var(--color-primary); color: white; }
.btn-primari:hover { background: var(--color-primary-dark); transform: translateY(-1px); }

#btn-reduccio {
    margin-top: var(--space-sm);
    width: 100%;
    justify-content: center;
    font-size: 1rem;
}

.btn-inactiu { background: var(--color-inactive); color: white; }

.btn-actiu {
    background: linear-gradient(135deg, #27ae60, #2ecc71);
    color: white;
    box-shadow: 0 4px 18px rgba(39, 174, 96, 0.45);
}

/* Saving summary block */
.saving-summary {
    margin-top: var(--space-md);
    background: var(--color-saving-bg);
    border: 1.5px solid var(--color-saving);
    border-radius: var(--radius-md);
    padding: var(--space-sm) var(--space-md);
    font-size: 0.88rem;
    color: var(--color-saving-text);
    animation: fadeSlideIn 0.35s ease both;
}

.saving-summary strong { font-size: 1rem; }

/* ── 5. Result Cards ──────────────────────────────────────────────────────── */
.resultats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: var(--space-md);
    margin-bottom: var(--space-xl);
}

.card {
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-card);
    overflow: hidden;
    transition: transform var(--transition), box-shadow var(--transition);
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-hover);
}

.card-header {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-md) var(--space-md) 0;
}

.card-header h3 {
    flex: 1;
    font-size: 1rem;
    font-weight: 700;
    color: var(--color-text);
}

.unit-badge {
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    padding: 0.15rem 0.55rem;
    border-radius: 999px;
    background: var(--color-surface-2);
    color: var(--color-text-muted);
    border: 1px solid var(--color-border);
}

/* Coloured left border accent */
.card { border-left: 5px solid transparent; }
.card-electricitat { border-left-color: var(--color-electricitat); }
.card-aigua        { border-left-color: var(--color-aigua); }
.card-oficina      { border-left-color: var(--color-oficina); }
.card-neteja       { border-left-color: var(--color-neteja); }

.card-icon { font-size: 1.6rem; }
.card-electricitat .card-icon { color: var(--color-electricitat); }
.card-aigua        .card-icon { color: var(--color-aigua); }
.card-oficina      .card-icon { color: var(--color-oficina); }
.card-neteja       .card-icon { color: var(--color-neteja); }

.dades { padding: var(--space-md); display: flex; flex-direction: column; gap: var(--space-sm); }

.dada-row {
    display: flex;
    flex-direction: column;
    gap: 0.15rem;
    padding: var(--space-sm);
    background: var(--color-surface-2);
    border-radius: var(--radius-sm);
}

.dada-label {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-text-muted);
}

.dada-values {
    display: flex;
    align-items: baseline;
    gap: var(--space-sm);
    flex-wrap: wrap;
}

.numero {
    font-size: 1.9rem;
    font-weight: 800;
    color: var(--color-text);
    font-variant-numeric: tabular-nums;
    line-height: 1.1;
    transition: color var(--transition);
}

.numero-secundari {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--color-text-muted);
    font-variant-numeric: tabular-nums;
    transition: color var(--transition);
}

.numero-principal { color: var(--color-text); }

/* ── 6. Saving Badges & Reduction Animations ──────────────────────────────── */

/*
  When reduction is active:
  - .original-value gets the strikethrough style and red colour
  - .numero-principal turns green
  - saving badges animate in
*/
.is-reduction-active .original-value {
    text-decoration: line-through;
    text-decoration-color: var(--color-strikethrough);
    color: var(--color-strikethrough);
    opacity: 0.75;
    font-size: 1rem;       /* shrinks so it reads as "old" value */
    font-weight: 600;
    transition: all var(--transition);
}

.is-reduction-active .numero-secundari.original-value {
    font-size: 0.85rem;
}

/* Make the new (reduced) value pop in green */
.is-reduction-active .numero-principal {
    color: var(--color-saving);
}

.is-reduction-active .numero-secundari:not(.original-value) {
    color: var(--color-saving);
}

/* Saving badge pill */
.saving-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    background: var(--color-saving-bg);
    color: var(--color-saving-text);
    border: 1px solid var(--color-saving);
    border-radius: 999px;
    padding: 0.15rem 0.6rem;
    font-size: 0.75rem;
    font-weight: 700;
    font-variant-numeric: tabular-nums;
    animation: fadeSlideIn 0.35s ease both;
    white-space: nowrap;
}

.saving-badge--sm { font-size: 0.7rem; padding: 0.1rem 0.5rem; }

@keyframes fadeSlideIn {
    from { opacity: 0; transform: translateY(4px); }
    to   { opacity: 1; transform: translateY(0); }
}

/* ── 7. Roadmap / Circular Economy Section ────────────────────────────────── */
.roadmap-section {
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-card);
    padding: var(--space-xl);
    margin-bottom: var(--space-xl);
}

.roadmap-header { margin-bottom: var(--space-lg); }

.roadmap-header h2 {
    color: var(--color-primary);
    font-size: 1.35rem;
    font-weight: 800;
    margin-bottom: 0.5rem;
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.subtitol-seccio { color: var(--color-text-muted); font-size: 0.92rem; margin-bottom: var(--space-md); }

/* CE Legend pills */
.ce-legend { display: flex; gap: var(--space-sm); flex-wrap: wrap; margin-top: var(--space-sm); }

.ce-pill {
    padding: 0.25rem 0.8rem;
    border-radius: 999px;
    font-size: 0.78rem;
    font-weight: 700;
    letter-spacing: 0.03em;
}

.ce-reduce  { background: #fdecea; color: #c0392b; border: 1px solid #e74c3c; }
.ce-reuse   { background: #fef5e7; color: #a04000; border: 1px solid #e67e22; }
.ce-recycle { background: #eafaf1; color: #1a6b3c; border: 1px solid #2ecc71; }

/* Year strip */
.year-strip {
    display: flex;
    align-items: center;
    gap: 0;
    margin-bottom: var(--space-lg);
    overflow-x: auto;
    padding-bottom: var(--space-xs);
}

.year-marker {
    flex: 1;
    text-align: center;
    padding: 0.55rem 0.8rem;
    border-radius: var(--radius-md);
    font-size: 0.82rem;
    font-weight: 700;
    color: white;
    white-space: nowrap;
    min-width: 120px;
}

.year-connector {
    height: 3px;
    flex: 0 0 2rem;
    background: var(--color-border);
}

.year-1 { background: var(--color-primary-dark); }
.year-2 { background: var(--color-primary); }
.year-3 { background: var(--color-primary-light); }

/* Roadmap grid */
.roadmap-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(100%, 280px), 1fr));
    gap: var(--space-md);
}

.roadmap-card {
    background: var(--color-surface-2);
    border-radius: var(--radius-md);
    padding: var(--space-md);
    border-top: 4px solid var(--color-primary);
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
    transition: box-shadow var(--transition);
}

.roadmap-card:hover { box-shadow: var(--shadow-hover); }

.roadmap-electricitat { border-top-color: var(--color-electricitat); }
.roadmap-aigua        { border-top-color: var(--color-aigua); }
.roadmap-oficina      { border-top-color: var(--color-oficina); }
.roadmap-neteja       { border-top-color: var(--color-neteja); }

.roadmap-card-title {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    flex-wrap: wrap;
}

.roadmap-icon { font-size: 1.3rem; }

.roadmap-card-title strong {
    flex: 1;
    font-size: 1rem;
    font-weight: 700;
}

.target-badge {
    font-size: 0.72rem;
    font-weight: 700;
    padding: 0.2rem 0.6rem;
    border-radius: 999px;
    background: var(--color-primary-ghost);
    color: var(--color-primary-dark);
    border: 1px solid var(--color-primary-light);
}

/* KPI chips */
.roadmap-kpis { display: flex; flex-direction: column; gap: 0.3rem; }

.kpi-chip {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    font-size: 0.78rem;
    font-weight: 600;
    color: var(--color-text-muted);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    padding: 0.25rem 0.6rem;
}

.kpi-measurable { color: var(--color-primary-dark); border-color: var(--color-primary-light); }

/* Roadmap steps (ordered list) */
.roadmap-steps {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.step {
    background: var(--color-surface);
    border-radius: var(--radius-sm);
    padding: var(--space-sm);
    border-left: 3px solid var(--color-border);
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.step-y1 { border-left-color: var(--color-primary-dark); }
.step-y2 { border-left-color: var(--color-primary); }
.step-y3 { border-left-color: var(--color-primary-light); }

.step-year {
    font-size: 0.7rem;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--color-text-muted);
}

.step p { font-size: 0.85rem; color: var(--color-text); line-height: 1.4; }

.step-indicator {
    font-size: 0.78rem;
    color: var(--color-primary-dark);
    font-style: normal;
    font-weight: 600;
}

/* CE action tags within steps */
.ce-tag {
    display: inline-block;
    font-size: 0.68rem;
    font-weight: 700;
    padding: 0.1rem 0.45rem;
    border-radius: 999px;
    align-self: flex-start;
}

.ce-tag.ce-reduce  { background: #fdecea; color: #c0392b; }
.ce-tag.ce-reuse   { background: #fef5e7; color: #a04000; }
.ce-tag.ce-recycle { background: #eafaf1; color: #1a6b3c; }

/* ── 8. Accessibility Utilities ───────────────────────────────────────────── */
.visually-hidden {
    position: absolute; width: 1px; height: 1px;
    padding: 0; margin: -1px; overflow: hidden;
    clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}

/* ── 9. Error State ───────────────────────────────────────────────────────── */
.error-banner {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    background: var(--color-error-bg);
    color: var(--color-error-text);
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-sm);
    border: 1px solid var(--color-error-text);
    margin-top: var(--space-md);
    font-weight: 600;
}

[hidden] { display: none !important; }

/* ── 10. Responsive ───────────────────────────────────────────────────────── */
@media (max-width: 600px) {
    .panel-control { grid-template-columns: 1fr; }

    .selector-grup { flex-direction: column; align-items: stretch; }
    .btn-primari   { width: 100%; justify-content: center; }

    .main-header   { padding-bottom: calc(var(--space-xl) + 2.5rem); }

    .roadmap-section { padding: var(--space-md); }

    .year-strip { gap: 0.3rem; }
    .year-connector { flex: 0 0 0.6rem; }
}

/* ── 11. Motion Preferences ───────────────────────────────────────────────── */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        transition-duration: 0.01ms !important;
    }
}