@import url('https://fonts.googleapis.com/css2?family=Playfair+Display:wght@600;700&family=DM+Sans:opsz,wght@9..40,300;9..40,400;9..40,500;9..40,700&display=swap');

:root {
    --bg-color:  #FBFBFB;
    --sec-bg:    #E8F9FF;
    --primary:   #C4D9FF;
    --accent:    #C5BAFF;
    --blue:      #5a8dee;
    --text:      #2d3a55;
    --muted:     #8898bb;
    --border:    #e0e8f5;
}

* { box-sizing: border-box; }

body {
    background: var(--bg-color);
    color: var(--text);
    margin: 0;
    padding: 0;
    font-family: 'DM Sans', 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

/* ── Navbar ─────────────────────────────────────── */
.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 5%;
    background: rgba(255, 255, 255, 0.82);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 100;
}

.logo {
    font-family: 'Playfair Display', Georgia, serif;
    font-weight: 700;
    font-size: 1.45rem;
    letter-spacing: -0.3px;
    color: var(--text);
}
.logo span {
    background: linear-gradient(135deg, var(--blue) 0%, var(--accent) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 24px;
    margin: 0;
    padding: 0;
}
.nav-links a {
    text-decoration: none;
    color: var(--muted);
    font-size: 0.85rem;
    font-weight: 500;
    transition: color 0.2s;
}
.nav-links a.active {
    color: var(--text);
    border-bottom: 2px solid var(--accent);
    padding-bottom: 2px;
}
.nav-links a:hover { color: var(--blue); }

/* ── Layout ─────────────────────────────────────── */
.container {
    max-width: 1000px;
    margin: 28px auto;
    padding: 0 20px;
}

/* ── Hero header ─────────────────────────────────── */
.tool-header {
    text-align: center;
    margin-bottom: 30px;
    padding: 34px 24px;
    background: linear-gradient(155deg, rgba(232, 249, 255, 0.75) 0%, rgba(196, 217, 255, 0.28) 100%);
    border-radius: 22px;
    border: 1px solid rgba(196, 217, 255, 0.55);
}
.tool-header h1 {
    font-family: 'Playfair Display', Georgia, serif;
    font-size: 2.15rem;
    font-weight: 700;
    margin: 0 0 9px;
    color: var(--text);
    letter-spacing: -0.5px;
}
.tool-header p {
    margin: 0;
    color: var(--muted);
    font-size: 0.93rem;
    font-weight: 400;
    letter-spacing: 0.15px;
}

/* ── Calculator card ─────────────────────────────── */
.calculator-card {
    background: white;
    border-radius: 26px;
    box-shadow: 0 20px 60px rgba(90, 141, 238, 0.09), 0 4px 18px rgba(0, 0, 0, 0.04);
    padding: 32px;
    border: 1px solid rgba(196, 217, 255, 0.45);
}

/* ── Results grid ────────────────────────────────── */
.results-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
    margin-bottom: 24px;
}

.result-item {
    background: linear-gradient(145deg, var(--sec-bg), rgba(232, 249, 255, 0.35));
    padding: 15px 12px;
    border-radius: 14px;
    text-align: center;
    border-left: 3.5px solid var(--primary);
    transition: transform 0.15s, box-shadow 0.15s;
}
.result-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 18px rgba(90, 141, 238, 0.1);
}

/* Corner-specific accent colours matching the SVG arcs */
.result-item[data-corner="TR"]  { border-left-color: #5a8dee; }
.result-item[data-corner="BR"]  { border-left-color: #a78dee; }
.result-item[data-corner="GAP"] { border-left-color: #e08040; }

.label {
    display: block;
    font-size: 0.65rem;
    font-weight: 700;
    color: var(--muted);
    margin-bottom: 5px;
    letter-spacing: 1.6px;
    text-transform: uppercase;
}
.value {
    font-size: 1.35rem;
    font-weight: 700;
    color: var(--text);
}
.unit {
    font-size: 0.7rem;
    color: var(--muted);
    margin-left: 2px;
}

/* ── Visualizer ──────────────────────────────────── */
.visualizer-area {
    background: white;
    border: 1px solid #eef3ff;
    border-radius: 18px;
    margin-bottom: 28px;
    position: relative;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    align-items: stretch;
    min-height: 440px;
}

#min-clearance-text {
    font-size: 0.78rem;
    color: var(--muted);
    padding: 10px 18px 0;
    font-weight: 500;
    letter-spacing: 0.15px;
    flex-shrink: 0;
}
#min-clearance-text span {
    color: var(--blue);
    font-weight: 700;
}

#svg-container {
    width: 100%;
    flex: 1;
    min-height: 0;
}
#svg-container svg {
    display: block;
    width: 100%;
    height: 100%;
}

/* ── Controls ────────────────────────────────────── */
.controls-section {
    border-top: 1px solid #f0f4ff;
    padding-top: 24px;
}

.unit-toggle-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 18px;
    gap: 12px;
    flex-wrap: wrap;
}

.toggle-group {
    display: flex;
    gap: 8px;
    align-items: center;
    flex-wrap: wrap;
}

.btn-secondary {
    background: var(--primary);
    border: none;
    padding: 9px 20px;
    border-radius: 50px;
    cursor: pointer;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text);
    font-family: inherit;
    transition: background 0.2s, transform 0.12s;
}
.btn-secondary:hover {
    background: #adc8ff;
    transform: translateY(-1px);
}

.btn-arc-toggle {
    background: var(--accent);
    border: none;
    padding: 9px 20px;
    border-radius: 50px;
    cursor: pointer;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text);
    font-family: inherit;
    transition: background 0.2s, transform 0.12s;
}
.btn-arc-toggle:hover {
    background: #b5acf5;
    transform: translateY(-1px);
}

.presets {
    display: flex;
    gap: 8px;
}
.presets button {
    background: white;
    border: 1.5px solid var(--blue);
    color: var(--blue);
    padding: 7px 16px;
    border-radius: 50px;
    cursor: pointer;
    font-size: 0.78rem;
    font-weight: 600;
    font-family: inherit;
    transition: all 0.18s;
}
.presets button:hover {
    background: var(--blue);
    color: white;
}

/* ── Inputs ──────────────────────────────────────── */
.input-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 14px;
    margin-top: 4px;
}
.input-group label {
    display: block;
    font-size: 0.76rem;
    margin-bottom: 5px;
    color: var(--muted);
    font-weight: 600;
    letter-spacing: 0.2px;
}
.hint {
    font-weight: 400;
    color: #b0bdd8;
    font-size: 0.68rem;
    letter-spacing: 0;
}
.input-group input {
    width: 100%;
    padding: 11px 14px;
    border-radius: 10px;
    border: 1.5px solid var(--border);
    background: var(--bg-color);
    font-size: 0.9rem;
    color: var(--text);
    font-family: inherit;
    outline: none;
    transition: border-color 0.2s, box-shadow 0.2s;
}
.input-group input:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(197, 186, 255, 0.22);
}

.input-group--full {
    grid-column: 1 / -1;
    padding-top: 6px;
    border-top: 1px dashed var(--border);
    margin-top: 4px;
}

.floor-warning {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 11px 16px;
    background: #fff4ec;
    border: 1.5px solid #f0a070;
    border-radius: 10px;
    margin-top: 16px;
    font-size: 0.82rem;
    color: #b04010;
    font-weight: 500;
    animation: warn-pulse 0.3s ease;
}
.warn-icon {
    font-size: 1.15rem;
    flex-shrink: 0;
}

@keyframes warn-pulse {
    from { transform: scale(0.97); opacity: 0; }
    to   { transform: scale(1);    opacity: 1; }
}

.btn-reset {
    width: 100%;
    margin-top: 20px;
    padding: 13px;
    border: none;
    background: #f5f5f7;
    border-radius: 12px;
    cursor: pointer;
    font-family: inherit;
    font-size: 0.85rem;
    font-weight: 600;
    color: #999;
    letter-spacing: 0.3px;
    transition: background 0.2s, color 0.2s;
}
.btn-reset:hover {
    background: #ffe8e8;
    color: #c06060;
}

/* ── Affiliate ───────────────────────────────────── */
.affiliate-section {
    margin-top: 42px;
    text-align: center;
}
.affiliate-section p {
    font-size: 0.75rem;
    color: #bbb;
    margin-bottom: 12px;
    text-transform: uppercase;
    letter-spacing: 1.2px;
    font-weight: 500;
}
.ad-placeholder {
    height: 100px;
    background: linear-gradient(135deg, var(--sec-bg), rgba(197, 186, 255, 0.1));
    border: 2px dashed var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 14px;
    color: #ccc;
    font-size: 0.85rem;
    font-weight: 500;
}

/* ── Range Sliders ───────────────────────────────── */
.slider-wrap {
    display: flex;
    align-items: center;
    gap: 10px;
}

.slider-val {
    font-size: 0.82rem;
    font-weight: 700;
    color: var(--blue);
    white-space: nowrap;
    min-width: 62px;
    text-align: right;
}

input[type="range"] {
    -webkit-appearance: none;
    appearance: none;
    flex: 1;
    height: 6px;
    border-radius: 3px;
    outline: none;
    cursor: pointer;
    border: none;
    padding: 0;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--blue);
    border: 2.5px solid white;
    box-shadow: 0 1px 6px rgba(90, 141, 238, 0.4);
    cursor: pointer;
    transition: background 0.15s, transform 0.12s;
}

input[type="range"]::-webkit-slider-thumb:hover {
    background: #4070cc;
    transform: scale(1.12);
}

input[type="range"]::-moz-range-thumb {
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--blue);
    border: 2.5px solid white;
    box-shadow: 0 1px 6px rgba(90, 141, 238, 0.4);
    cursor: pointer;
}

input[type="range"]::-moz-range-track {
    height: 6px;
    border-radius: 3px;
    background: transparent;
}

/* ── Mobile ──────────────────────────────────────── */
@media (max-width: 640px) {
    .results-grid       { grid-template-columns: 1fr 1fr; }
    .input-grid         { grid-template-columns: 1fr; }
    .calculator-card    { padding: 20px; }
    .tool-header h1     { font-size: 1.5rem; }
    .unit-toggle-container { flex-direction: column; align-items: flex-start; }
}