@import url('https://fonts.googleapis.com/css2?family=Barlow+Condensed:wght@400;600;700;800;900&family=Barlow:wght@300;400;500;600&family=Martian+Mono:wght@300;400;500&display=swap');

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

:root {
    --bg:            #060607;
    --panel:         #0b0c0f;
    --surface:       #101218;
    --surface-hi:    #14161e;
    --border:        #1c1e26;
    --border-hi:     #272a34;
    --text:          #ddd9d0;
    --text-muted:    #5e5c56;
    --text-dim:      #2c2b27;
    --amber:         #c8882a;
    --amber-bright:  #edb040;
    --amber-dark:    #7a520e;
    --amber-glow:    rgba(200, 136, 42, 0.14);
    --font-display:  'Barlow Condensed', sans-serif;
    --font-mono:     'Martian Mono', monospace;
    --font-body:     'Barlow', sans-serif;
    --r:             2px;
}

/* ─── BASE ──────────────────────────────────────────────────── */

body {
    font-family: var(--font-body);
    background-color: var(--bg);
    background-image:
        linear-gradient(rgba(255,255,255,0.019) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,0.019) 1px, transparent 1px);
    background-size: 28px 28px;
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    padding: 52px 20px 80px;
    color: var(--text);
}

/* ─── CALCULATOR PANEL ──────────────────────────────────────── */

.calculator {
    background: var(--panel);
    border: 1px solid var(--border);
    border-top: 2px solid var(--amber);
    border-radius: var(--r);
    padding: 40px;
    width: 100%;
    max-width: 560px;
    box-shadow:
        0 0 0 1px rgba(0,0,0,0.6),
        0 48px 120px rgba(0,0,0,0.72),
        0 0 80px rgba(200, 136, 42, 0.04);
    animation: rise 0.65s cubic-bezier(0.16, 1, 0.3, 1) both;
    position: relative;
    overflow: hidden;
}

/* subtle hex/nut watermark */
.calculator::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='56' height='64' viewBox='0 0 56 64'%3E%3Cpath d='M28 3 L53 17 L53 47 L28 61 L3 47 L3 17 Z' fill='none' stroke='rgba(255,255,255,0.028)' stroke-width='1'/%3E%3C/svg%3E");
    background-repeat: repeat;
    pointer-events: none;
    z-index: 0;
}

.calculator > * { position: relative; z-index: 1; }

@keyframes rise {
    from { opacity: 0; transform: translateY(28px); }
    to   { opacity: 1; transform: translateY(0); }
}

/* ─── HEADER ────────────────────────────────────────────────── */

.calc-header {
    margin-bottom: 32px;
    animation: fade-up 0.5s 0.08s both;
}

@keyframes fade-up {
    from { opacity: 0; transform: translateY(10px); }
    to   { opacity: 1; transform: translateY(0); }
}

.site-label {
    font-family: var(--font-body);
    font-size: 0.62rem;
    font-weight: 600;
    letter-spacing: 0.24em;
    text-transform: uppercase;
    color: var(--amber);
    margin-bottom: 8px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.site-label::before {
    content: '';
    display: inline-block;
    width: 7px;
    height: 7px;
    background: var(--amber);
    clip-path: polygon(50% 0%,100% 25%,100% 75%,50% 100%,0% 75%,0% 25%);
    flex-shrink: 0;
}

h1 {
    font-family: var(--font-display);
    font-size: 2.25rem;
    font-weight: 900;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    color: var(--text);
    line-height: 1;
}

.formula {
    display: flex;
    align-items: center;
    gap: 12px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-left: 3px solid var(--amber-dark);
    padding: 11px 16px;
    border-radius: var(--r);
    font-family: var(--font-body);
    font-size: 0.7rem;
    font-weight: 500;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--text-muted);
    margin-top: 16px;
}

.formula code {
    font-family: var(--font-mono);
    font-size: 0.88rem;
    color: var(--amber-bright);
    font-weight: 500;
    letter-spacing: 0.14em;
}

/* ─── TABS ──────────────────────────────────────────────────── */

.tabs {
    display: flex;
    border-bottom: 1px solid var(--border);
    margin-bottom: 26px;
    animation: fade-up 0.5s 0.14s both;
}

.tab {
    padding: 10px 24px 10px 0;
    font-family: var(--font-body);
    font-size: 0.72rem;
    font-weight: 600;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    color: var(--text-muted);
    cursor: pointer;
    border-bottom: 2px solid transparent;
    margin-bottom: -1px;
    transition: color 0.18s, border-color 0.18s;
    user-select: none;
}

.tab + .tab {
    padding-left: 24px;
    padding-right: 0;
    border-left: 1px solid var(--border);
}

.tab:hover { color: var(--text); }

.tab.active {
    color: var(--amber);
    border-bottom-color: var(--amber);
}

/* ─── INPUT GROUPS ──────────────────────────────────────────── */

.input-group {
    margin-bottom: 18px;
    animation: fade-up 0.5s 0.18s both;
}

label {
    display: block;
    font-family: var(--font-body);
    font-size: 0.62rem;
    font-weight: 600;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--text-muted);
    margin-bottom: 7px;
}

select {
    width: 100%;
    padding: 10px 36px 10px 12px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--r);
    color: var(--text);
    font-family: var(--font-mono);
    font-size: 0.8rem;
    font-weight: 300;
    appearance: none;
    -webkit-appearance: none;
    cursor: pointer;
    transition: border-color 0.18s, background 0.18s, box-shadow 0.18s;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6' viewBox='0 0 10 6'%3E%3Cpath d='M1 1l4 4 4-4' stroke='%235e5c56' stroke-width='1.5' fill='none' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
}

select:hover {
    border-color: var(--border-hi);
    background-color: var(--surface-hi);
}

select:focus {
    outline: none;
    border-color: rgba(200, 136, 42, 0.45);
    background-color: var(--surface-hi);
    box-shadow: 0 0 0 3px rgba(200, 136, 42, 0.07);
}

select option,
select optgroup {
    background: #14161e;
    color: var(--text);
}

.row {
    display: flex;
    gap: 14px;
}

.row .input-group { flex: 1; }

/* ─── PITCH HINT ────────────────────────────────────────────── */

.pitch-hint {
    margin-top: 8px;
    padding: 8px 12px;
    background: transparent;
    border: 1px solid var(--border);
    font-family: var(--font-mono);
    font-size: 0.7rem;
    font-weight: 300;
    color: var(--text-muted);
    border-radius: var(--r);
    line-height: 1.6;
}

.pitch-hint strong {
    color: var(--text);
    font-weight: 400;
}

/* ─── CALCULATE BUTTON ──────────────────────────────────────── */

button {
    width: 100%;
    padding: 16px;
    background: var(--amber);
    color: #080400;
    border: none;
    border-radius: var(--r);
    font-family: var(--font-display);
    font-size: 1.08rem;
    font-weight: 800;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    cursor: pointer;
    margin-top: 8px;
    transition: background 0.18s, box-shadow 0.18s, transform 0.08s;
    animation: fade-up 0.5s 0.22s both;
}

button:hover {
    background: var(--amber-bright);
    box-shadow: 0 8px 28px rgba(200, 136, 42, 0.3);
}

button:active {
    transform: scale(0.988);
    background: var(--amber);
    box-shadow: none;
}

/* ─── RESULT ────────────────────────────────────────────────── */

.result {
    margin-top: 20px;
    padding: 26px 28px;
    background: #050507;
    border: 1px solid var(--border);
    border-radius: var(--r);
    display: none;
    position: relative;
    overflow: hidden;
}

.result::before {
    content: '';
    position: absolute;
    top: 0;
    left: 32px;
    right: 32px;
    height: 1px;
    background: linear-gradient(90deg,
        transparent,
        rgba(200, 136, 42, 0.55),
        transparent);
}

.result.show {
    display: block;
    animation: result-in 0.38s cubic-bezier(0.16, 1, 0.3, 1) both;
}

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

.result-label {
    font-family: var(--font-body);
    font-size: 0.6rem;
    font-weight: 600;
    letter-spacing: 0.24em;
    text-transform: uppercase;
    color: var(--text-muted);
    margin-bottom: 12px;
}

.result-value {
    font-family: var(--font-mono);
    font-size: 4rem;
    font-weight: 400;
    color: var(--amber-bright);
    line-height: 1;
    display: flex;
    align-items: baseline;
    gap: 10px;
    letter-spacing: -0.01em;
}

.result-unit {
    font-size: 1.15rem;
    color: var(--text-muted);
    font-weight: 300;
    letter-spacing: 0.06em;
}

.details {
    margin-top: 18px;
    padding-top: 16px;
    border-top: 1px solid var(--border);
    font-family: var(--font-mono);
    font-size: 0.7rem;
    font-weight: 300;
    color: var(--text-muted);
    display: grid;
    gap: 5px;
    line-height: 1.6;
}

/* ─── FOOTER LINKS ──────────────────────────────────────────── */

.hidden { display: none; }

.legal-links {
    margin-top: 20px;
    padding-top: 16px;
    border-top: 1px solid var(--border);
    display: flex;
    justify-content: center;
    gap: 16px;
    flex-wrap: wrap;
}

.legal-links a {
    font-family: var(--font-body);
    font-size: 0.66rem;
    font-weight: 500;
    letter-spacing: 0.07em;
    color: var(--text-muted);
    text-decoration: none;
    transition: color 0.18s;
}

.legal-links a:hover { color: var(--amber); }

/* ─── LEGAL / INFO PAGES ────────────────────────────────────── */

.legal-page {
    background: var(--panel);
    border: 1px solid var(--border);
    border-top: 2px solid var(--amber);
    border-radius: var(--r);
    padding: 44px;
    width: 100%;
    max-width: 760px;
    box-shadow:
        0 0 0 1px rgba(0,0,0,0.6),
        0 48px 120px rgba(0,0,0,0.72);
    animation: rise 0.65s cubic-bezier(0.16, 1, 0.3, 1) both;
    position: relative;
    overflow: hidden;
}

.legal-page::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='56' height='64' viewBox='0 0 56 64'%3E%3Cpath d='M28 3 L53 17 L53 47 L28 61 L3 47 L3 17 Z' fill='none' stroke='rgba(255,255,255,0.022)' stroke-width='1'/%3E%3C/svg%3E");
    background-repeat: repeat;
    pointer-events: none;
    z-index: 0;
}

.legal-page > * { position: relative; z-index: 1; }

.legal-page h1 {
    font-family: var(--font-display);
    font-size: 2rem;
    font-weight: 900;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    color: var(--text);
    margin-bottom: 28px;
    text-align: left;
}

.legal-page p {
    font-family: var(--font-body);
    color: var(--text-muted);
    margin-bottom: 14px;
    line-height: 1.78;
    font-size: 0.94rem;
}

.legal-page p strong {
    color: var(--text);
    font-weight: 600;
}

.back-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    margin-top: 22px;
    font-family: var(--font-body);
    font-size: 0.72rem;
    font-weight: 600;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--amber);
    text-decoration: none;
    transition: color 0.18s, gap 0.22s;
}

.back-link::before {
    content: '←';
    font-size: 0.9rem;
    font-weight: 400;
}

.back-link:hover {
    color: var(--amber-bright);
    gap: 12px;
}

/* ─── RESPONSIVE ────────────────────────────────────────────── */

@media (max-width: 720px) {
    body {
        padding: 24px 16px 60px;
    }

    .calculator,
    .legal-page {
        padding: 26px 20px;
    }

    h1 {
        font-size: 1.9rem;
    }

    .result-value {
        font-size: 3.2rem;
    }

    .row {
        flex-direction: column;
        gap: 0;
    }
}