/* ========================================================================
   Sub-Calculator Pages — Specialized Conversion Tool Styles
   Design System: Dark Luxury · Glassmorphism · Teal-to-Violet Gradient
   ======================================================================== */

/* --- CSS Custom Properties (inherit from homepage.css) --- */
:root {
    --sc-grad-start: #06b6d4;
    --sc-grad-mid: #6366f1;
    --sc-grad-end: #8b5cf6;
    --sc-bg-body: #06080c;
    --sc-bg-surface: rgba(10, 14, 22, 0.65);
    --sc-bg-card: rgba(12, 16, 26, 0.55);
    --sc-bg-card-hover: rgba(16, 22, 38, 0.7);
    --sc-bg-input: rgba(8, 12, 20, 0.8);
    --sc-border-subtle: rgba(6, 182, 212, 0.1);
    --sc-border-glow: rgba(6, 182, 212, 0.25);
    --sc-text-primary: #e8ecf5;
    --sc-text-secondary: #8094b0;
    --sc-text-accent: #06b6d4;
    --sc-font-display: 'Space Grotesk', 'Inter', sans-serif;
    --sc-font-body: 'Inter', sans-serif;
    --sc-font-mono: 'JetBrains Mono', monospace;
    --sc-radius-md: 16px;
    --sc-radius-lg: 24px;
    --sc-transition-fast: 0.2s cubic-bezier(0.16, 1, 0.3, 1);
    --sc-transition-med: 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

/* ═══ Section Container ═══ */
.sc-section {
    max-width: 1200px;
    margin: 0 auto;
    padding: 80px 24px;
}

@media (min-width: 640px) {
    .sc-section { padding: 100px 32px; }
}
@media (min-width: 1024px) {
    .sc-section { padding: 120px 48px; }
}

.sc-section-header {
    text-align: center;
    margin-bottom: 48px;
}

.sc-section-title {
    font-family: var(--sc-font-display);
    font-size: clamp(26px, 4vw, 42px);
    font-weight: 800;
    letter-spacing: -0.02em;
    line-height: 1.15;
    margin-bottom: 16px;
    color: var(--sc-text-primary);
}

.sc-section-subtitle {
    font-size: clamp(14px, 2vw, 17px);
    color: var(--sc-text-secondary);
    max-width: 700px;
    margin: 0 auto;
    line-height: 1.7;
}

.sc-gradient-text {
    background: linear-gradient(135deg, var(--sc-grad-start), var(--sc-grad-mid), var(--sc-grad-end));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* ═══ Hero ═══ */
.sc-hero {
    text-align: center;
    padding: 60px 24px 20px;
    max-width: 900px;
    margin: 0 auto;
}

@media (min-width: 640px) {
    .sc-hero { padding: 80px 32px 30px; }
}

.sc-hero h1 {
    font-family: var(--sc-font-display);
    font-size: clamp(28px, 5vw, 48px);
    font-weight: 800;
    letter-spacing: -0.03em;
    line-height: 1.1;
    margin-bottom: 16px;
    color: var(--sc-text-primary);
}

.sc-hero p {
    font-size: clamp(14px, 2vw, 17px);
    color: var(--sc-text-secondary);
    line-height: 1.7;
    max-width: 680px;
    margin: 0 auto;
}

/* ═══ Calculator Card ═══ */
.sc-calculator {
    max-width: 680px;
    margin: 0 auto 0;
    padding: 0 24px;
}

@media (min-width: 640px) {
    .sc-calculator { padding: 0 32px; }
}

.sc-calc-card {
    background: var(--sc-bg-card);
    backdrop-filter: blur(24px) saturate(1.3);
    -webkit-backdrop-filter: blur(24px) saturate(1.3);
    border: 1px solid var(--sc-border-glow);
    border-radius: var(--sc-radius-lg);
    box-shadow: 0 8px 40px rgba(0, 0, 0, 0.4), inset 0 1px 0 rgba(255, 255, 255, 0.06);
    padding: 32px 24px;
    position: relative;
    overflow: hidden;
}

@media (min-width: 640px) {
    .sc-calc-card { padding: 40px 36px; }
}

.sc-calc-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--sc-grad-start), var(--sc-grad-mid), var(--sc-grad-end));
}

.sc-calc-title {
    font-family: var(--sc-font-display);
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 8px;
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--sc-text-primary);
}

.sc-calc-title svg {
    color: var(--sc-text-accent);
    flex-shrink: 0;
}

.sc-calc-formula-display {
    text-align: center;
    margin-bottom: 24px;
    font-family: var(--sc-font-mono);
    font-size: 14px;
    color: var(--sc-grad-start);
    letter-spacing: 0.5px;
    padding: 10px 16px;
    background: rgba(6, 182, 212, 0.06);
    border-radius: 10px;
    border: 1px solid rgba(6, 182, 212, 0.1);
}

.sc-live-indicator {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 11px;
    color: var(--sc-text-secondary);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 20px;
}

.sc-live-dot {
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: #10b981;
    box-shadow: 0 0 8px rgba(16, 185, 129, 0.6);
    animation: sc-pulse 2s ease-in-out infinite;
}

@keyframes sc-pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.4; }
}

.sc-form-group {
    margin-bottom: 16px;
}

.sc-form-label {
    display: block;
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--sc-text-secondary);
    margin-bottom: 8px;
}

.sc-form-input-wrap {
    display: flex;
    align-items: center;
    background: var(--sc-bg-input);
    border: 1px solid var(--sc-border-subtle);
    border-radius: 12px;
    transition: border-color var(--sc-transition-fast), box-shadow var(--sc-transition-fast);
}

.sc-form-input-wrap:focus-within {
    border-color: var(--sc-border-glow);
    box-shadow: 0 0 0 3px rgba(6, 182, 212, 0.1);
}

.sc-form-input {
    flex: 1;
    background: none;
    border: none;
    outline: none;
    padding: 14px 16px;
    font-family: var(--sc-font-mono);
    font-size: 16px;
    color: var(--sc-text-primary);
    min-width: 0;
}

.sc-form-input::placeholder {
    color: rgba(128, 148, 176, 0.4);
}

.sc-form-unit {
    padding: 0 16px 0 0;
    font-family: var(--sc-font-mono);
    font-size: 13px;
    color: var(--sc-text-secondary);
    white-space: nowrap;
    font-weight: 500;
}

.sc-form-select {
    width: 100%;
    background: var(--sc-bg-input);
    border: 1px solid var(--sc-border-subtle);
    border-radius: 12px;
    padding: 14px 16px;
    font-family: var(--sc-font-body);
    font-size: 14px;
    color: var(--sc-text-primary);
    outline: none;
    cursor: pointer;
    transition: border-color var(--sc-transition-fast);
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%238094b0' stroke-width='2.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 14px center;
    padding-right: 36px;
}

.sc-form-select:focus {
    border-color: var(--sc-border-glow);
}

.sc-form-select option {
    background: #0e1220;
    color: var(--sc-text-primary);
}

.sc-result-divider {
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--sc-border-glow), transparent);
    margin: 24px 0;
}

.sc-result-display {
    text-align: center;
    padding: 20px 0;
}

.sc-result-big {
    font-family: var(--sc-font-display);
    font-size: clamp(28px, 5vw, 40px);
    font-weight: 800;
    letter-spacing: -0.02em;
    background: linear-gradient(135deg, var(--sc-grad-start), var(--sc-grad-end));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 8px;
    transition: transform var(--sc-transition-fast);
}

.sc-result-big.sc-bounce {
    animation: sc-result-bounce 0.35s cubic-bezier(0.34, 1.56, 0.64, 1);
}

@keyframes sc-result-bounce {
    0% { transform: scale(1); }
    40% { transform: scale(1.06); }
    100% { transform: scale(1); }
}

.sc-result-label {
    font-size: 13px;
    color: var(--sc-text-secondary);
    font-family: var(--sc-font-mono);
}

.sc-calc-actions {
    display: flex;
    gap: 12px;
    margin-top: 20px;
}

.sc-btn-reset {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    width: 100%;
    padding: 12px 20px;
    border: 1px solid var(--sc-border-subtle);
    border-radius: 12px;
    background: transparent;
    color: var(--sc-text-secondary);
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--sc-transition-fast);
}

.sc-btn-reset:hover {
    border-color: var(--sc-border-glow);
    color: var(--sc-text-primary);
    background: rgba(6, 182, 212, 0.06);
}

.sc-precision-row {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-top: 16px;
}

.sc-precision-row label {
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--sc-text-secondary);
    white-space: nowrap;
}

.sc-precision-row select {
    flex: 1;
}

/* ═══ How It Works — Flow Diagram ═══ */
.sc-flow-diagram {
    display: flex;
    align-items: stretch;
    justify-content: center;
    gap: 0;
    flex-wrap: wrap;
    margin-bottom: 40px;
}

@media (max-width: 767px) {
    .sc-flow-diagram {
        flex-direction: column;
        align-items: center;
        gap: 0;
    }
}

.sc-flow-node {
    flex: 1;
    min-width: 200px;
    max-width: 320px;
    background: var(--sc-bg-card);
    border: 1px solid var(--sc-border-subtle);
    border-radius: var(--sc-radius-md);
    padding: 28px 20px;
    text-align: center;
    transition: border-color var(--sc-transition-fast), transform var(--sc-transition-fast);
}

.sc-flow-node:hover {
    border-color: var(--sc-border-glow);
    transform: translateY(-4px);
}

.sc-flow-node-step {
    display: inline-block;
    font-size: 10px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 2px;
    color: var(--sc-grad-start);
    background: rgba(6, 182, 212, 0.08);
    padding: 4px 14px;
    border-radius: 20px;
    margin-bottom: 16px;
}

.sc-flow-node-icon {
    width: 48px;
    height: 48px;
    margin: 0 auto 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(6, 182, 212, 0.08);
    border-radius: 14px;
    color: var(--sc-grad-start);
}

.sc-flow-node-icon svg {
    width: 24px;
    height: 24px;
}

.sc-flow-node h3 {
    font-family: var(--sc-font-display);
    font-size: 16px;
    font-weight: 700;
    margin-bottom: 8px;
    color: var(--sc-text-primary);
}

.sc-flow-node p {
    font-size: 13px;
    color: var(--sc-text-secondary);
    line-height: 1.6;
}

.sc-flow-arrow {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0 8px;
    color: var(--sc-text-secondary);
    opacity: 0.4;
}

.sc-flow-arrow svg {
    width: 24px;
    height: 24px;
}

@media (max-width: 767px) {
    .sc-flow-arrow {
        transform: rotate(90deg);
        padding: 8px 0;
    }
}

.sc-content-body {
    max-width: 800px;
    margin: 0 auto;
    font-size: 15px;
    color: var(--sc-text-secondary);
    line-height: 1.8;
}

.sc-content-body strong {
    color: var(--sc-text-primary);
    font-weight: 600;
}

/* ═══ Formula Visual ═══ */
.sc-formula-visual {
    margin-bottom: 40px;
}

.sc-formula-main {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    flex-wrap: wrap;
    padding: 32px 20px;
    background: var(--sc-bg-card);
    border: 1px solid var(--sc-border-subtle);
    border-radius: var(--sc-radius-lg);
    margin-bottom: 32px;
}

.sc-formula-part {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
}

.sc-formula-part-value {
    font-family: var(--sc-font-display);
    font-size: clamp(18px, 3vw, 26px);
    font-weight: 700;
    color: var(--sc-text-primary);
}

.sc-formula-part-label {
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    padding: 3px 10px;
    border-radius: 6px;
}

.sc-formula-part-label.label-result {
    background: rgba(6, 182, 212, 0.12);
    color: #06b6d4;
}

.sc-formula-part-label.label-volume {
    background: rgba(99, 102, 241, 0.12);
    color: #818cf8;
}

.sc-formula-part-label.label-density {
    background: rgba(139, 92, 246, 0.12);
    color: #a78bfa;
}

.sc-formula-part-label.label-factor {
    background: rgba(16, 185, 129, 0.12);
    color: #34d399;
}

.sc-formula-operator {
    font-family: var(--sc-font-display);
    font-size: clamp(20px, 3vw, 28px);
    font-weight: 300;
    color: var(--sc-text-secondary);
    opacity: 0.5;
}

.sc-formula-examples {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 20px;
}

.sc-formula-example {
    background: var(--sc-bg-card);
    border: 1px solid var(--sc-border-subtle);
    border-radius: var(--sc-radius-md);
    padding: 24px;
}

.sc-formula-example h4 {
    font-family: var(--sc-font-display);
    font-size: 14px;
    font-weight: 700;
    color: var(--sc-text-accent);
    margin-bottom: 12px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.sc-formula-line {
    font-family: var(--sc-font-mono);
    font-size: 13px;
    color: var(--sc-text-secondary);
    padding: 4px 0;
    line-height: 1.6;
}

.sc-formula-line strong {
    color: var(--sc-text-primary);
}

/* ═══ Conversion Chart ═══ */
.sc-chart-visual {
    margin-bottom: 40px;
}

.sc-chart-table-wrap {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    border: 1px solid var(--sc-border-subtle);
    border-radius: var(--sc-radius-md);
    background: var(--sc-bg-card);
}

.sc-chart-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 14px;
}

.sc-chart-table thead {
    position: sticky;
    top: 0;
}

.sc-chart-table th {
    background: rgba(6, 182, 212, 0.06);
    padding: 14px 20px;
    text-align: left;
    font-size: 12px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--sc-text-accent);
    border-bottom: 1px solid var(--sc-border-subtle);
    white-space: nowrap;
}

.sc-chart-table td {
    padding: 12px 20px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.03);
    font-family: var(--sc-font-mono);
    color: var(--sc-text-primary);
    white-space: nowrap;
}

.sc-chart-table tbody tr {
    transition: background var(--sc-transition-fast);
}

.sc-chart-table tbody tr:hover {
    background: rgba(6, 182, 212, 0.04);
}

.sc-chart-table tbody tr:last-child td {
    border-bottom: none;
}

/* ═══ FAQ ═══ */
.sc-faq-section {
    max-width: 1200px;
    margin: 0 auto;
    padding: 80px 24px;
}

@media (min-width: 640px) {
    .sc-faq-section { padding: 100px 32px; }
}
@media (min-width: 1024px) {
    .sc-faq-section { padding: 80px 48px; }
}

.sc-faq-grid {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.sc-faq-item {
    background: var(--sc-bg-card);
    border: 1px solid var(--sc-border-subtle);
    border-radius: var(--sc-radius-md);
    overflow: hidden;
    transition: border-color var(--sc-transition-fast);
}

.sc-faq-item:hover {
    border-color: var(--sc-border-glow);
}

.sc-faq-question {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding: 18px 24px;
    background: none;
    border: none;
    cursor: pointer;
    font-family: var(--sc-font-body);
    font-size: 15px;
    font-weight: 600;
    color: var(--sc-text-primary);
    text-align: left;
    line-height: 1.5;
}

.sc-faq-chevron {
    flex-shrink: 0;
    transition: transform var(--sc-transition-fast);
    color: var(--sc-text-secondary);
}

.sc-faq-item.is-open .sc-faq-chevron {
    transform: rotate(180deg);
}

.sc-faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--sc-transition-med);
}

.sc-faq-item.is-open .sc-faq-answer {
    max-height: 500px;
}

.sc-faq-answer p {
    padding: 0 24px 18px;
    font-size: 14px;
    color: var(--sc-text-secondary);
    line-height: 1.7;
}

/* ═══ Cross-Links Grid ═══ */
.sc-tools-section {
    max-width: 1200px;
    margin: 0 auto;
    padding: 40px 24px 80px;
}

@media (min-width: 640px) {
    .sc-tools-section { padding: 40px 32px 100px; }
}

.sc-tools-title {
    font-family: var(--sc-font-display);
    font-size: 22px;
    font-weight: 700;
    text-align: center;
    margin-bottom: 8px;
    color: var(--sc-text-primary);
}

.sc-tools-subtitle {
    text-align: center;
    font-size: 14px;
    color: var(--sc-text-secondary);
    margin-bottom: 32px;
}

.sc-tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 12px;
}

.sc-tool-card {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 14px 18px;
    background: var(--sc-bg-card);
    border: 1px solid var(--sc-border-subtle);
    border-radius: 14px;
    text-decoration: none;
    color: var(--sc-text-primary);
    font-size: 13px;
    font-weight: 600;
    transition: all var(--sc-transition-fast);
}

.sc-tool-card:hover {
    border-color: var(--sc-border-glow);
    background: var(--sc-bg-card-hover);
    transform: translateY(-2px);
    text-decoration: none;
    color: var(--sc-text-primary);
}

.sc-tool-icon {
    font-size: 18px;
    flex-shrink: 0;
}

.sc-tool-name {
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* ═══ Section Divider ═══ */
.sc-section-divider {
    height: 1px;
    max-width: 200px;
    margin: 0 auto;
    background: linear-gradient(90deg, transparent, var(--sc-border-glow), transparent);
}

/* ═══ Homepage Related Calculators Grid ═══ */
.related-calculators-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 14px;
    margin-top: 32px;
}

.related-calc-card {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px 20px;
    background: rgba(12, 16, 26, 0.55);
    border: 1px solid rgba(6, 182, 212, 0.1);
    border-radius: 16px;
    text-decoration: none;
    color: #e8ecf5;
    font-size: 14px;
    font-weight: 600;
    transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

.related-calc-card:hover {
    border-color: rgba(6, 182, 212, 0.25);
    background: rgba(16, 22, 38, 0.7);
    transform: translateY(-2px);
    text-decoration: none;
    color: #e8ecf5;
}

.related-calc-icon {
    font-size: 22px;
    flex-shrink: 0;
}

.related-calc-name {
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}