@import url('https://fonts.googleapis.com/css2?family=DM+Sans:wght@300;400;500;600&display=swap');
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
    --bg:           #f2f2f7;
    --card:         rgba(255,255,255,0.82);
    --card-border:  rgba(0,0,0,0.07);
    --surface:      rgba(118,118,128,0.12);
    --label:        #6e6e73;
    --body:         #1c1c1e;
    --accent:       #0071e3;
    --green:        #34c759;
    --red:          #ff3b30;
    --amber:        #ff9f0a;
    --sep:          rgba(60,60,67,0.12);
    --radius-card:  20px;
    --radius-input: 12px;
    --radius-pill:  100px;
    --font:         'DM Sans', -apple-system, BlinkMacSystemFont, sans-serif;
    --shadow:       0 8px 32px rgba(0,0,0,0.10), 0 1.5px 4px rgba(0,0,0,0.06);
}

/* Logic Utilities */
.hidden { display: none !important; }

body {
    font-family: var(--font);
    background: var(--bg);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    padding: 32px 16px 64px;
    color: var(--body);
    overflow-x: hidden;
}

/* ── View switcher ── */
.views { width: 100%; max-width: 400px; }
.view { width: 100%; }

#view-input  { display: block; animation: fadeIn 0.28s ease; }
#view-input.hidden  { display: none; }

#view-results { display: none; }
#view-results.visible { display: block; animation: fadeIn 0.28s ease; }

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(8px); }
    to   { opacity: 1; transform: translateY(0); }
}

/* ── Page chrome ── */
.app-title {
    text-align: center;
    font-size: 0.72rem;
    font-weight: 600;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--label);
    margin-bottom: 18px;
}

#header {
    text-align: center;
    font-size: 0.78rem;
    font-weight: 500;
    color: var(--label);
    background: var(--card);
    border: 1px solid var(--card-border);
    border-radius: var(--radius-pill);
    padding: 8px 18px;
    margin-bottom: 16px;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    line-height: 1.6;
    box-shadow: 0 1px 4px rgba(0,0,0,0.06);
    transition: color 0.4s;
}

/* ── Card ── */
.card {
    background: var(--card);
    border: 1px solid var(--card-border);
    border-radius: var(--radius-card);
    box-shadow: var(--shadow);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    overflow: hidden;
    margin-bottom: 12px;
}

.card-section { padding: 16px 20px; }
.card-section + .card-section { border-top: 1px solid var(--sep); }

.section-label {
    font-size: 0.68rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--label);
    margin-bottom: 10px;
}

/* ── Fields ── */
.field { margin-bottom: 0; }
.field + .field { border-top: 1px solid var(--sep); }

.field-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 11px 0;
}

.field-label {
    font-size: 0.9rem;
    font-weight: 400;
    color: var(--body);
    flex: 1;
}

.field input[type="number"] {
    width: 110px;
    text-align: right;
    border: none;
    background: transparent;
    font-family: var(--font);
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--accent);
    outline: none;
    -moz-appearance: textfield;
}
.field input[type="number"]::-webkit-outer-spin-button,
.field input[type="number"]::-webkit-inner-spin-button { -webkit-appearance: none; }
.field input[type="number"]::placeholder { color: #b0b0b8; font-weight: 400; }

#market_price {
    font-size: 1.35rem !important;
    font-weight: 600 !important;
    letter-spacing: -0.01em;
}

/* ── Segmented control ── */
.seg-control {
    display: flex;
    background: var(--surface);
    border-radius: var(--radius-pill);
    padding: 3px;
    gap: 2px;
    width: 100%;
}
.seg-control label {
    flex: 1;
    text-align: center;
    font-size: 0.82rem;
    font-weight: 500;
    color: var(--label);
    padding: 7px 6px;
    border-radius: var(--radius-pill);
    cursor: pointer;
    transition: background 0.22s, color 0.22s, box-shadow 0.22s;
    user-select: none;
    white-space: nowrap;
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
}
.seg-control input[type="radio"] { display: none; }
.seg-control input[type="radio"]:checked + label {
    background: white;
    color: var(--body);
    font-weight: 600;
    box-shadow: 0 1px 4px rgba(0,0,0,0.14), 0 0.5px 1px rgba(0,0,0,0.08);
}

/* ── BUDI toggle ── */
.toggle-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 0;
}
.toggle-label { font-size: 0.9rem; color: var(--body); }
.toggle-sub   { font-size: 0.75rem; color: var(--label); margin-top: 1px; }

.switch { position: relative; width: 50px; height: 28px; flex-shrink: 0; }
.switch input { opacity: 0; width: 0; height: 0; }
.slider {
    position: absolute; inset: 0;
    background: var(--surface);
    border-radius: var(--radius-pill);
    transition: background 0.25s;
    cursor: pointer;
}
.slider::before {
    content: "";
    position: absolute;
    width: 22px; height: 22px;
    left: 3px; top: 3px;
    background: white;
    border-radius: 50%;
    box-shadow: 0 1px 4px rgba(0,0,0,0.22);
    transition: transform 0.25s cubic-bezier(.4,0,.2,1);
}
.switch input:checked + .slider { background: var(--green); }
.switch input:checked + .slider::before { transform: translateX(22px); }

/* ── Input mode panels ── */
.input-panel { display: none; }
.input-panel.active { display: block; }

/* ── Buttons ── */
.btn-primary {
    width: 100%;
    padding: 15px;
    background: var(--accent);
    color: white;
    border: none;
    border-radius: var(--radius-input);
    font-family: var(--font);
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: opacity 0.18s, transform 0.12s;
    letter-spacing: 0.01em;
}
.btn-primary:active { opacity: 0.82; transform: scale(0.988); }

.btn-ghost {
    width: 100%;
    padding: 13px;
    background: transparent;
    color: var(--accent);
    border: none;
    font-family: var(--font);
    font-size: 0.88rem;
    font-weight: 500;
    cursor: pointer;
    border-radius: var(--radius-input);
    transition: background 0.18s;
    margin-top: 2px;
}
.btn-ghost:hover { background: var(--surface); }

/* ── Results ── */
.result-row {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    padding: 11px 0;
}
.result-row + .result-row { border-top: 1px solid var(--sep); }
.result-key { font-size: 0.88rem; color: var(--label); font-weight: 400; }
.result-val { font-size: 0.92rem; font-weight: 600; color: var(--body); }
.result-val.large { font-size: 1.2rem; letter-spacing: -0.02em; }
.result-val.green  { color: var(--green); }
.result-val.accent { color: var(--accent); }

/* ── Gauge ── */
.gauge-wrap { padding: 14px 0 6px; }
.gauge-title {
    font-size: 0.72rem; font-weight: 600;
    letter-spacing: 0.07em; text-transform: uppercase;
    color: var(--label); margin-bottom: 8px;
}
.gauge-track {
    height: 6px; background: var(--surface);
    border-radius: var(--radius-pill); overflow: hidden;
}
.gauge-fill {
    height: 100%; width: 0%;
    border-radius: var(--radius-pill);
    transition: width 0.6s cubic-bezier(.4,0,.2,1), background-color 0.4s;
}
.gauge-ends {
    display: flex; justify-content: space-between;
    font-size: 0.68rem; color: #b0b0b8; margin-top: 5px;
}

/* ── Version & Credits footer ── */
.footer-container {
    text-align: center;
    margin-top: 28px;
}
.version-footer {
    font-size: 0.65rem;
    color: #b0b0b8;
    letter-spacing: 0.06em;
}
.credits-footer {
    font-size: 0.6rem;
    color: #c0c0c8;
    margin-top: 6px;
    letter-spacing: 0.04em;
    font-weight: 400;
}

/* ── Version & Credits footer ── */
.footer-container {
    text-align: center;
    margin-top: 32px; /* Increased margin for better separation */
    padding-bottom: 20px; /* Extra breathing room at the bottom of the page */
}

/* ── Mobile-first ── */
@media (max-width: 390px) {
    body { padding: 16px 10px 48px; }
    .btn-primary { padding: 17px; font-size: 1rem; }
    .btn-ghost   { padding: 15px; font-size: 0.95rem; }
    .seg-control label { padding: 9px 4px; font-size: 0.78rem; }
    .field-inner { padding: 13px 0; }
    .field-label { font-size: 0.95rem; }
    .field input[type="number"] { font-size: 1rem; width: 120px; }
    #market_price { font-size: 1.5rem !important; }
    .toggle-label { font-size: 0.95rem; }
    .switch { width: 54px; height: 30px; }
    .slider::before { width: 24px; height: 24px; }
    .switch input:checked + .slider::before { transform: translateX(24px); }
}