/* ==========================================================================
   StockMarketWave Styles
   Plain CSS is used so Hostinger can serve updates directly without a build step.
   ========================================================================== */

/* ==========================================================================
   01. Design Tokens
   Shared colors, spacing, typography, and elevation values.
   ========================================================================== */

:root {
    --color-bg: #f7f9fc;
    --color-bg-soft: #eef4fb;
    --color-surface: #ffffff;
    --color-text: #102033;
    --color-text-soft: #334155;
    --color-muted: #64748b;
    --color-primary: #0f766e;
    --color-primary-dark: #115e59;
    --color-accent: #2563eb;
    --color-border: #dbe5ef;

    --font-sans: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;

    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    --space-16: 4rem;
    --space-20: 5rem;

    --radius-md: 1rem;
    --radius-lg: 1.5rem;
    --radius-pill: 999px;

    --shadow-sm: 0 0.75rem 1.5rem rgba(15, 23, 42, 0.08);
    --shadow-md: 0 1.25rem 3rem rgba(15, 23, 42, 0.12);
    --shadow-lg: 0 1.5rem 4rem rgba(15, 23, 42, 0.14);

    --container-width: 72rem;
    --container-padding: clamp(1rem, 4vw, 2rem);
    --header-height: 4.5rem;

    --transition-fast: 180ms ease;
    --transition-base: 240ms ease;
}

/* ==========================================================================
   02. Base Styles
   Browser reset, global defaults, and reusable accessibility helpers.
   ========================================================================== */

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: calc(var(--header-height) + var(--space-4));
}

body {
    min-width: 20rem;
    margin: 0;
    color: var(--color-text);
    background:
        radial-gradient(circle at top right, rgba(37, 99, 235, 0.08), transparent 28rem),
        var(--color-bg);
    font-family: var(--font-sans);
    line-height: 1.5;
}

img,
svg {
    display: block;
    max-width: 100%;
}

a {
    color: inherit;
    text-decoration: none;
}

button,
input,
textarea,
select {
    font: inherit;
}

button,
[type="button"],
[type="submit"],
[type="reset"],
.button,
.calculator-tab,
.calculator-name-list a,
.related-calculator-list a,
.calculator-link-card {
    cursor: pointer;
}

h1,
h2,
h3,
p {
    margin-top: 0;
}

h1,
h2,
h3 {
    color: var(--color-text);
    letter-spacing: -0.05em;
    line-height: 1;
}

p {
    color: var(--color-muted);
    line-height: 1.8;
}

:focus-visible {
    outline: 3px solid rgba(37, 99, 235, 0.45);
    outline-offset: 3px;
}

.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;
}

[hidden] {
    display: none !important;
}

/* ==========================================================================
   03. Layout
   Page shell, reusable containers, grids, and high-level placement.
   ========================================================================== */

.container {
    width: min(100% - (var(--container-padding) * 2), var(--container-width));
    margin-inline: auto;
}

.page-section {
    padding-block: clamp(var(--space-8), 5vw, var(--space-12));
}

.page-section--hero {
    padding-block-start: clamp(var(--space-6), 6vw, var(--space-10));
}

.hero.page-section--hero {
    padding-block-start: clamp(var(--space-2), 3vw, var(--space-5));
    padding-block-end: clamp(var(--space-6), 5vw, var(--space-10));
}

.calculator-detail.page-section--hero {
    padding-block: clamp(var(--space-5), 4vw, var(--space-8));
}

.calculators.page-section--hero {
    padding-block: clamp(var(--space-4), 3vw, var(--space-6));
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 20;
    min-height: var(--header-height);
    border-bottom: 1px solid rgba(219, 229, 239, 0.82);
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(18px);
    transition: box-shadow var(--transition-base), border-color var(--transition-base);
}

.site-header.is-scrolled {
    border-color: rgba(219, 229, 239, 0.95);
    box-shadow: var(--shadow-sm);
}

.site-nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    min-height: var(--header-height);
    gap: var(--space-4);
}

.site-nav__menu {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    margin: 0;
    padding: 0;
    list-style: none;
}

.hero__grid,
.split-layout {
    display: grid;
    gap: clamp(var(--space-8), 5vw, var(--space-12));
}

.hero__grid {
    align-items: center;
}

.card-grid,
.metric-grid,
.timeline {
    display: grid;
    gap: var(--space-4);
}

.card-grid {
    grid-template-columns: repeat(auto-fit, minmax(min(100%, 14rem), 1fr));
}

.metric-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
}

.timeline {
    grid-template-columns: 1fr;
    margin: 0;
    padding: 0;
    list-style: none;
}

/* ==========================================================================
   04. Components
   Small reusable UI pieces shared across sections.
   ========================================================================== */

.brand {
    display: inline-flex;
    align-items: center;
    gap: var(--space-3);
    min-width: 0;
    font-size: clamp(0.95rem, 2vw, 1.05rem);
    font-weight: 800;
}

.brand__mark {
    display: grid;
    flex: 0 0 auto;
    width: 2.5rem;
    height: 2.5rem;
    place-items: center;
    border-radius: 0.85rem;
    color: var(--color-surface);
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    font-size: 0.78rem;
    letter-spacing: -0.04em;
}

.brand__logo {
    display: block;
    flex: 0 0 auto;
    width: 3.75rem;
    height: 3.75rem;
    border-radius: 0.85rem;
    object-fit: contain;
}

.brand__name {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.site-nav__menu a {
    display: block;
    border-radius: var(--radius-md);
    padding: var(--space-2) var(--space-3);
    color: var(--color-muted);
    font-weight: 800;
    transition: color var(--transition-fast), background var(--transition-fast);
}

.site-nav__menu a:hover {
    color: var(--color-primary);
    background: var(--color-bg-soft);
}

.site-nav__menu a[aria-current="page"] {
    color: var(--color-primary);
    background: var(--color-bg-soft);
}

.eyebrow {
    margin-bottom: var(--space-3);
    color: var(--color-primary);
    font-size: clamp(0.72rem, 2vw, 0.78rem);
    font-weight: 900;
    letter-spacing: 0.16em;
    text-transform: uppercase;
}

.section-heading {
    max-width: 44rem;
    margin-bottom: clamp(var(--space-4), 3vw, var(--space-6));
}

.section-heading--compact {
    margin-bottom: 0;
}

.section-heading h1,
.section-heading h2 {
    margin-bottom: var(--space-3);
    font-size: clamp(1.75rem, 6vw, 2.75rem);
}

.button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 3rem;
    border-radius: var(--radius-pill);
    padding: 0.85rem 1.2rem;
    font-weight: 900;
    line-height: 1.1;
    text-align: center;
    transition: background var(--transition-fast), color var(--transition-fast), transform var(--transition-fast);
}

.button:hover {
    transform: translateY(-1px);
}

.button--primary {
    color: var(--color-surface);
    background: var(--color-primary);
    box-shadow: 0 1rem 2rem rgba(15, 118, 110, 0.25);
}

.button--primary:hover {
    background: var(--color-primary-dark);
}

.preview-card,
.feature-card,
.timeline__item,
.status-card {
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    background: var(--color-surface);
    box-shadow: var(--shadow-md);
}

.feature-card,
.timeline__item {
    padding: clamp(var(--space-5), 4vw, var(--space-6));
}

.feature-card h3,
.timeline__item h3 {
    margin-bottom: var(--space-3);
    font-size: 1.25rem;
}

.feature-card p,
.timeline__item p {
    margin-bottom: 0;
}

.feature-card__number,
.timeline__step {
    display: inline-flex;
    margin-bottom: var(--space-4);
    color: var(--color-accent);
    font-size: 0.85rem;
    font-weight: 900;
    letter-spacing: 0.08em;
}

.check-list {
    display: grid;
    gap: var(--space-3);
    margin: 0;
    padding: 0;
    list-style: none;
}

.check-list li {
    position: relative;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--space-4) var(--space-4) var(--space-4) 2.75rem;
    background: var(--color-surface);
    color: var(--color-text-soft);
    font-weight: 800;
}

.check-list li::before {
    content: "";
    position: absolute;
    top: 1.25rem;
    left: 1rem;
    width: 0.85rem;
    height: 0.85rem;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
}

.text-positive {
    color: var(--color-primary);
}

/* ==========================================================================
   05. Page Sections
   Styles scoped to the homepage sections.
   ========================================================================== */

.hero__content {
    max-width: 44rem;
}

.hero__content h1 {
    margin-bottom: var(--space-4);
    font-size: clamp(2.5rem, 11vw, 4.5rem);
}

.hero__copy {
    max-width: 42rem;
    margin-bottom: 0;
    font-size: clamp(1rem, 2.6vw, 1.15rem);
}

.hero__actions {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
    margin-top: var(--space-6);
}

.preview-card {
    width: 100%;
    max-width: 28rem;
    padding: clamp(var(--space-5), 5vw, var(--space-8));
}

.preview-card__label {
    margin-bottom: var(--space-2);
    color: var(--color-muted);
    font-weight: 800;
}

.preview-card h2 {
    margin-bottom: var(--space-5);
    font-size: clamp(1.7rem, 5vw, 2rem);
}

.metric-card {
    min-width: 0;
    border-radius: var(--radius-md);
    padding: var(--space-4);
    background: var(--color-bg-soft);
}

.metric-card span {
    display: block;
    margin-bottom: var(--space-2);
    color: var(--color-muted);
    font-size: 0.82rem;
    font-weight: 800;
}

.metric-card strong {
    display: block;
    font-size: clamp(1.05rem, 4vw, 1.3rem);
    line-height: 1.2;
}

.tools {
    background:
        linear-gradient(180deg, rgba(255, 255, 255, 0), rgba(238, 244, 251, 0.72), rgba(255, 255, 255, 0));
}

.roadmap {
    padding-block-start: clamp(var(--space-6), 5vw, var(--space-10));
}

.status {
    padding-block-start: clamp(var(--space-5), 4vw, var(--space-8));
}

.status-card {
    padding: clamp(var(--space-6), 5vw, var(--space-10));
    text-align: center;
}

.status-card h2 {
    margin-bottom: var(--space-4);
    font-size: clamp(2rem, 8vw, 3.5rem);
}

.status-card p:last-child {
    margin-bottom: 0;
}

.site-footer {
    border-top: 1px solid var(--color-border);
    padding-block: var(--space-5);
    color: var(--color-muted);
    text-align: center;
    background: var(--color-surface);
}

.site-footer p {
    margin-bottom: 0;
}

/* Calculator Hub */

.calculator-hub {
    display: grid;
    gap: clamp(var(--space-5), 4vw, var(--space-8));
}

.calculator-hub__heading {
    margin-bottom: 0;
}

.calculator-tabs {
    display: flex;
    gap: var(--space-3);
    overflow-x: auto;
    padding: var(--space-2);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-pill);
    background: var(--color-surface);
    box-shadow: var(--shadow-sm);
    scrollbar-width: none;
}

.calculator-tabs::-webkit-scrollbar {
    display: none;
}

.calculator-tab {
    flex: 1 0 auto;
    border: 0;
    border-radius: var(--radius-pill);
    padding: 0.85rem 1.15rem;
    color: var(--color-muted);
    background: transparent;
    box-shadow: none;
    font-weight: 900;
    cursor: pointer;
    transition: color var(--transition-fast), background var(--transition-fast), box-shadow var(--transition-fast);
}

.calculator-tab:not(.is-active) {
    color: var(--color-muted);
    background: transparent;
    box-shadow: none;
}

.calculator-tab.is-active {
    color: var(--color-surface);
    background: var(--color-primary);
    box-shadow: 0 0.75rem 1.5rem rgba(15, 118, 110, 0.22);
}

.calculator-tab:hover:not(.is-active) {
    color: var(--color-primary);
    background: var(--color-bg-soft);
    box-shadow: none;
}

html[data-calculator-category] .calculator-tab {
    color: var(--color-muted);
    background: transparent;
    box-shadow: none;
}

html[data-calculator-category="stocks"] .calculator-tab[data-calculator-tab="stocks"],
html[data-calculator-category="mutual-funds"] .calculator-tab[data-calculator-tab="mutual-funds"],
html[data-calculator-category="etfs"] .calculator-tab[data-calculator-tab="etfs"] {
    color: var(--color-surface);
    background: var(--color-primary);
    box-shadow: 0 0.75rem 1.5rem rgba(15, 118, 110, 0.22);
}

html[data-calculator-category="stocks"] .calculator-tab:not([data-calculator-tab="stocks"]):hover,
html[data-calculator-category="mutual-funds"] .calculator-tab:not([data-calculator-tab="mutual-funds"]):hover,
html[data-calculator-category="etfs"] .calculator-tab:not([data-calculator-tab="etfs"]):hover {
    color: var(--color-primary);
    background: var(--color-bg-soft);
}

.calculator-showcase {
    display: grid;
    gap: var(--space-4);
}

.calculator-feature-grid {
    display: grid;
    gap: var(--space-4);
}

.calculator-card,
.calculator-panel,
.calculator-group {
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    background: var(--color-surface);
    box-shadow: var(--shadow-md);
}

.calculator-card {
    padding: clamp(var(--space-5), 4vw, var(--space-6));
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast), transform var(--transition-fast);
}

.calculator-card.is-highlighted {
    border-color: rgba(15, 118, 110, 0.35);
    box-shadow: 0 1.25rem 3rem rgba(15, 118, 110, 0.16);
    transform: translateY(-2px);
}

.calculator-card__tag,
.calculator-panel__header span {
    display: inline-flex;
    margin-bottom: var(--space-3);
    color: var(--color-primary);
    font-size: 0.75rem;
    font-weight: 900;
    letter-spacing: 0.14em;
    text-transform: uppercase;
}

.calculator-card h3,
.calculator-panel h3 {
    margin-bottom: var(--space-3);
    font-size: clamp(1.35rem, 4vw, 1.75rem);
    line-height: 1.08;
}

.calculator-card p {
    margin-bottom: var(--space-4);
}

.calculator-card ul {
    display: grid;
    gap: var(--space-2);
    margin: 0;
    padding: 0;
    list-style: none;
}

.calculator-card li {
    position: relative;
    padding-left: var(--space-5);
    color: var(--color-text-soft);
    font-weight: 800;
}

.calculator-card li::before {
    content: "";
    position: absolute;
    top: 0.65rem;
    left: 0;
    width: 0.55rem;
    height: 0.55rem;
    border-radius: 50%;
    background: var(--color-primary);
}

.calculator-panels {
    display: grid;
}

.calculator-panel {
    display: none;
    padding: clamp(var(--space-5), 4vw, var(--space-8));
}

.calculator-panel.is-active {
    display: grid;
    gap: var(--space-6);
}

.calculator-panel__header h3 {
    max-width: 48rem;
    margin-bottom: 0;
}

.calculator-group-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(100%, 18rem), 1fr));
    gap: var(--space-4);
}

.calculator-group {
    padding: var(--space-5);
}

.calculator-group h4 {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    margin: 0 0 var(--space-5);
    border-radius: var(--radius-pill);
    padding: 0.5rem 0.8rem;
    color: var(--color-primary);
    background: rgba(15, 118, 110, 0.09);
    font-size: 0.9rem;
    font-weight: 900;
    letter-spacing: -0.02em;
}

.calculator-group h4::before {
    content: "";
    width: 0.55rem;
    height: 0.55rem;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
}

.calculator-name-list {
    display: grid;
    gap: var(--space-2);
    margin: 0;
    padding: 0;
    list-style: none;
}

.calculator-name-list a {
    display: block;
    border-radius: var(--radius-md);
    padding: var(--space-2) var(--space-3);
    color: var(--color-text-soft);
    font-weight: 750;
    line-height: 1.45;
    transition: color var(--transition-fast), background var(--transition-fast), transform var(--transition-fast);
}

.calculator-name-list a:hover {
    color: var(--color-primary);
    background: var(--color-bg-soft);
    transform: translateX(2px);
}

.calculator-list-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(100%, 15rem), 1fr));
    gap: var(--space-4);
}

.calculator-link-card {
    display: grid;
    gap: var(--space-2);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--space-4);
    background: var(--color-bg);
    transition: border-color var(--transition-fast), background var(--transition-fast), transform var(--transition-fast);
}

.calculator-link-card:hover {
    border-color: rgba(15, 118, 110, 0.45);
    background: var(--color-surface);
    transform: translateY(-2px);
}

.calculator-link-card span {
    color: var(--color-accent);
    font-size: 0.8rem;
    font-weight: 900;
    letter-spacing: 0.08em;
}

.calculator-link-card strong {
    color: var(--color-text);
    font-size: 1.05rem;
}

.calculator-link-card small {
    color: var(--color-muted);
    font-weight: 700;
    line-height: 1.5;
}

/* Calculator Detail Pages */

.calculator-detail__grid,
.calculator-workspace,
.calculator-guide-grid {
    display: grid;
    gap: clamp(var(--space-5), 3vw, var(--space-8));
}

.calculator-workspace {
    max-width: 68rem;
    gap: clamp(var(--space-4), 3vw, var(--space-6));
}

.calculator-workspace-section {
    padding-block: clamp(var(--space-6), 4vw, var(--space-8));
}

.calculator-workspace--single {
    max-width: 48rem;
}

.calculator-detail__grid {
    align-items: center;
}

.calculator-detail__intro {
    max-width: 52rem;
}

.calculator-detail__intro h1 {
    margin-bottom: var(--space-3);
    font-size: clamp(2rem, 6vw, 3.25rem);
}

.calculator-detail__intro p {
    max-width: 44rem;
    margin-bottom: 0;
    font-size: clamp(1rem, 2.5vw, 1.15rem);
}

.calculator-note-card,
.calculator-form,
.calculator-results,
.guide-card {
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    background: var(--color-surface);
    box-shadow: var(--shadow-md);
}

.calculator-note-card {
    padding: var(--space-4);
}

.calculator-note-card span,
.calculator-form__header span,
.calculator-results__header span,
.guide-card span {
    display: inline-flex;
    margin-bottom: var(--space-2);
    color: var(--color-primary);
    font-size: 0.75rem;
    font-weight: 900;
    letter-spacing: 0.14em;
    text-transform: uppercase;
}

.calculator-note-card p,
.calculator-form__header p {
    margin-bottom: 0;
}

.calculator-form,
.calculator-results,
.guide-card {
    padding: clamp(var(--space-3), 2.5vw, var(--space-5));
}

.calculator-form__header,
.calculator-results__header {
    margin-bottom: var(--space-3);
}

.calculator-form__header h2,
.calculator-results__header h2,
.guide-card h2 {
    margin-bottom: var(--space-1);
    font-size: clamp(1.25rem, 3.5vw, 1.6rem);
}

.formula-details {
    align-self: start;
}

.formula-details summary {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: var(--space-4);
    cursor: pointer;
    list-style: none;
}

.formula-details summary::-webkit-details-marker {
    display: none;
}

.formula-details summary::after {
    content: "+";
    display: grid;
    grid-column: 2;
    grid-row: 1 / span 2;
    width: 2rem;
    height: 2rem;
    place-items: center;
    border-radius: 50%;
    color: var(--color-primary);
    background: rgba(15, 118, 110, 0.1);
    font-size: 1.2rem;
    font-weight: 900;
}

.formula-details[open] summary::after {
    content: "-";
}

.formula-details summary span {
    grid-column: 1;
    grid-row: 1;
    margin-bottom: var(--space-1);
}

.formula-details summary strong {
    display: block;
    grid-column: 1;
    grid-row: 2;
    color: var(--color-text);
    font-size: clamp(1.25rem, 4vw, 1.55rem);
    letter-spacing: -0.04em;
    line-height: 1.1;
}

.formula-details[open] .formula-stack {
    margin-top: var(--space-4);
}

.form-grid {
    display: grid;
    gap: var(--space-3);
}

.field {
    display: grid;
    gap: var(--space-2);
    color: var(--color-text-soft);
    font-weight: 850;
}

.field input,
.field select {
    width: 100%;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 0.8rem 0.9rem;
    color: var(--color-text);
    background: var(--color-bg);
    font-weight: 800;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-fast);
}

.field input:focus,
.field select:focus {
    border-color: rgba(15, 118, 110, 0.5);
    background: var(--color-surface);
    box-shadow: 0 0 0 4px rgba(15, 118, 110, 0.1);
    outline: 0;
}

.field select {
    appearance: none;
    -webkit-appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%23334155' stroke-width='2.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 1rem center;
    background-size: 1.1rem;
    padding-right: 2.75rem;
    cursor: pointer;
}

.field select option {
    cursor: pointer;
}

.calculator-form__actions {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
    margin-top: var(--space-5);
}

.button--ghost {
    border: 1px solid var(--color-border);
    color: var(--color-text);
    background: var(--color-surface);
}

.result-card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(100%, 10.5rem), 1fr));
    gap: var(--space-2);
}

.calculator-blueprint-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(100%, 11rem), 1fr));
    gap: var(--space-3);
}

.result-card {
    display: grid;
    gap: var(--space-1);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--space-2) var(--space-3);
    background: var(--color-bg);
}

.result-card span {
    color: var(--color-muted);
    font-size: 0.78rem;
    font-weight: 850;
}

.result-card strong {
    color: var(--color-text);
    font-size: clamp(1.1rem, 3vw, 1.35rem);
    line-height: 1.1;
}

.result-card--primary {
    border-color: rgba(15, 118, 110, 0.35);
    background: rgba(15, 118, 110, 0.08);
}

.comparison-chart {
    display: grid;
    gap: var(--space-2);
    margin-top: var(--space-3);
    border-radius: var(--radius-lg);
    padding: var(--space-3);
    background: var(--color-bg-soft);
}

.comparison-chart__bar {
    display: grid;
    grid-template-columns: 5.5rem minmax(0, 1fr) 6rem;
    align-items: center;
    gap: var(--space-3);
    color: var(--color-muted);
    font-weight: 850;
}

.comparison-chart__bar div {
    overflow: hidden;
    height: 0.85rem;
    border-radius: var(--radius-pill);
    background: rgba(100, 116, 139, 0.16);
}

.comparison-chart__bar i {
    display: block;
    width: 0;
    height: 100%;
    border-radius: inherit;
    background: linear-gradient(90deg, var(--color-accent), var(--color-primary));
    transition: width var(--transition-base);
}

.comparison-chart__bar strong {
    color: var(--color-text);
    text-align: right;
}

.formula-stack,
.related-calculator-list {
    display: grid;
    gap: var(--space-3);
    margin: 0;
    padding: 0;
    list-style: none;
}

.formula-row {
    display: grid;
    gap: var(--space-2);
    border-radius: var(--radius-md);
    padding: var(--space-2) var(--space-3);
    background: var(--color-bg);
}

.formula-row span {
    margin-bottom: 0;
    color: var(--color-text);
    font-size: 0.9rem;
    letter-spacing: 0;
    text-transform: none;
}

.formula-row code {
    overflow-wrap: anywhere;
    color: var(--color-text-soft);
    font-family: var(--font-sans);
    font-size: 0.9rem;
    font-weight: 750;
    line-height: 1.5;
}

.related-calculator-list a {
    display: block;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--space-3) var(--space-4);
    color: var(--color-text-soft);
    font-weight: 850;
    transition: color var(--transition-fast), border-color var(--transition-fast), background var(--transition-fast);
}

.related-calculator-list a:hover {
    border-color: rgba(15, 118, 110, 0.45);
    color: var(--color-primary);
    background: var(--color-bg-soft);
}

/* Crawlability and Content Helpers */

.breadcrumb {
    width: 100%;
    margin: var(--space-2) 0 var(--space-4);
    padding-inline: clamp(var(--space-3), 2vw, var(--space-6));
    color: var(--color-muted);
    font-size: 0.9rem;
    font-weight: 800;
}

.breadcrumb ol {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
    margin: 0;
    padding: 0;
    list-style: none;
}

.breadcrumb li {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
}

.breadcrumb li + li::before {
    content: "/";
    color: var(--color-border);
}

.breadcrumb a {
    color: var(--color-muted);
}

.breadcrumb a:hover {
    color: var(--color-primary);
}

.popular-calculators {
    padding-block-start: 0;
}

.popular-calculator-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(100%, 16rem), 1fr));
    gap: var(--space-3);
    margin-top: var(--space-4);
}

.popular-calculator-grid a {
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--space-4);
    color: var(--color-text);
    background: var(--color-surface);
    box-shadow: var(--shadow-sm);
    font-weight: 900;
    transition: color var(--transition-fast), border-color var(--transition-fast), transform var(--transition-fast);
}

.popular-calculator-grid a:hover {
    border-color: rgba(15, 118, 110, 0.45);
    color: var(--color-primary);
    transform: translateY(-2px);
}

.faq-section {
    padding-block-start: 0;
}

.faq-card {
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: clamp(var(--space-4), 3vw, var(--space-6));
    background: var(--color-surface);
    box-shadow: var(--shadow-md);
}

.faq-card > span {
    display: inline-flex;
    margin-bottom: var(--space-2);
    color: var(--color-primary);
    font-size: 0.75rem;
    font-weight: 900;
    letter-spacing: 0.14em;
    text-transform: uppercase;
}

.faq-card h2 {
    margin-bottom: var(--space-4);
    font-size: clamp(1.4rem, 4vw, 1.8rem);
}

.faq-list {
    display: grid;
    gap: var(--space-3);
}

.faq-item {
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--space-3) var(--space-4);
    background: var(--color-bg);
}

.faq-item summary {
    cursor: pointer;
    color: var(--color-text);
    font-weight: 900;
}

.faq-item p {
    margin: var(--space-3) 0 0;
}

.content-hero {
    padding-block: clamp(var(--space-5), 4vw, var(--space-8));
}

.content-section,
.calculator-insights-section {
    padding-block-start: 0;
}

.content-card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(100%, 18rem), 1fr));
    gap: var(--space-4);
}

.content-card {
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: clamp(var(--space-4), 3vw, var(--space-5));
    background: var(--color-surface);
    box-shadow: var(--shadow-sm);
}

.content-card h2 {
    margin-bottom: var(--space-3);
    font-size: clamp(1.25rem, 3vw, 1.65rem);
}

.content-card p {
    margin-bottom: 0;
}

.article-layout {
    display: grid;
    gap: clamp(var(--space-5), 3vw, var(--space-8));
    align-items: start;
}

.article-content {
    display: grid;
    gap: var(--space-4);
}

.article-block {
    position: relative;
}

.article-block::before {
    content: "";
    position: absolute;
    inset: var(--space-5) auto var(--space-5) 0;
    width: 0.25rem;
    border-radius: var(--radius-pill);
    background: linear-gradient(180deg, var(--color-primary), var(--color-accent));
    opacity: 0.8;
}

.article-block h2,
.article-block p {
    padding-left: var(--space-3);
}

.article-related {
    align-self: start;
}

.guide-preview-section {
    padding-block-start: 0;
}

.guide-link-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(100%, 17rem), 1fr));
    gap: var(--space-3);
    margin-top: var(--space-4);
}

.guide-link-card {
    display: grid;
    gap: var(--space-2);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-4);
    color: var(--color-text);
    background: var(--color-surface);
    box-shadow: var(--shadow-sm);
    transition: border-color var(--transition-fast), color var(--transition-fast), transform var(--transition-fast);
}

.guide-link-card:hover {
    border-color: rgba(15, 118, 110, 0.45);
    color: var(--color-primary);
    transform: translateY(-2px);
}

.guide-link-card span {
    color: var(--color-muted);
    font-size: 0.95rem;
    font-weight: 700;
    line-height: 1.6;
}

.calculator-guides-callout {
    display: grid;
    gap: var(--space-4);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: clamp(var(--space-5), 4vw, var(--space-6));
    background: linear-gradient(135deg, rgba(15, 118, 110, 0.08), rgba(37, 99, 235, 0.08));
}

.calculator-guides-callout h2 {
    margin-bottom: var(--space-3);
    font-size: clamp(1.5rem, 4vw, 2rem);
}

.calculator-guides-callout p:last-child {
    margin-bottom: 0;
}

.site-footer__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-4);
    width: 100%;
    padding-inline: var(--space-6);
}

.site-footer__links {
    display: flex;
    flex-wrap: nowrap;
    justify-content: flex-end;
    gap: var(--space-6);
    font-size: 0.8rem;
    font-weight: 800;
}

.site-footer__links a {
    color: var(--color-muted);
    white-space: nowrap;
    transition: color var(--transition-fast);
}

.site-footer__links a:hover {
    color: var(--color-primary);
}

/* ==========================================================================
   06. Responsive Rules
   Mobile-first breakpoints for dynamic screen-based layouts.
   ========================================================================== */

@media (max-width: 24rem) {
    .brand__name {
        max-width: 9rem;
    }

    .metric-grid {
        grid-template-columns: 1fr;
    }
}

@media (min-width: 36rem) {
    .hero__actions {
        flex-direction: row;
        flex-wrap: wrap;
    }

    .calculator-form__actions {
        flex-direction: row;
        flex-wrap: wrap;
    }
}

@media (min-width: 48rem) {
    .calculator-tabs {
        justify-self: start;
        min-width: min(100%, 32rem);
    }

    .timeline {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }

    .form-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .calculator-guide-grid {
        grid-template-columns: repeat(auto-fit, minmax(min(100%, 18rem), 1fr));
        align-items: start;
    }
}

@media (max-width: 48rem) {
    .site-footer__inner {
        flex-direction: column;
        gap: var(--space-3);
    }

    .site-footer__links {
        flex-wrap: wrap;
        justify-content: center;
        gap: var(--space-3) var(--space-4);
    }
}

@media (min-width: 54rem) {
    .hero__grid {
        grid-template-columns: minmax(0, 1.15fr) minmax(19rem, 0.85fr);
    }

    .preview-card {
        justify-self: end;
    }

    .split-layout {
        grid-template-columns: minmax(0, 0.92fr) minmax(0, 1.08fr);
        align-items: start;
    }

    .calculator-detail__grid {
        grid-template-columns: minmax(0, 1fr) minmax(18rem, 0.4fr);
    }

    .calculator-workspace {
        grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
        align-items: start;
    }

    .article-layout {
        grid-template-columns: minmax(0, 1.35fr) minmax(18rem, 0.65fr);
    }
}

@media (min-width: 72rem) {
    .hero__content h1 {
        max-width: 48rem;
    }
}

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        scroll-behavior: auto !important;
        transition-duration: 0.01ms !important;
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
    }
}