/* =========================
   TORQDEX // GLOBAL
========================= */

:root {
    --bg: #0d0f12;
    --bg-soft: #14171b;
    --panel: #181c21;
    --panel-hover: #1d2228;

    --text: #f1f3f5;
    --text-soft: #a9b0b8;
    --text-dim: #707985;

    --line: #2a3038;
    --line-strong: #3a424d;

    --accent: #f0a43a;
    --accent-soft: rgba(240, 164, 58, 0.12);
    --accent-border: rgba(240, 164, 58, 0.35);

    --max-width: 1200px;
    --radius: 10px;
}


/* =========================
   RESET
========================= */

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

html {
    scroll-behavior: smooth;
}

body {
    min-height: 100vh;

    background:
        linear-gradient(rgba(255, 255, 255, 0.018) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.018) 1px, transparent 1px),
        var(--bg);

    background-size: 32px 32px;

    color: var(--text);

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

    line-height: 1.6;
}

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

button,
input {
    font: inherit;
}

.container {
    width: min(var(--max-width), 90%);
    margin-inline: auto;
}


/* =========================
   HEADER
========================= */

.site-header {
    position: sticky;
    top: 0;
    z-index: 1000;

    background: rgba(13, 15, 18, 0.92);
    backdrop-filter: blur(14px);

    border-bottom: 1px solid var(--line);
}

.header-inner {
    min-height: 72px;

    display: flex;
    align-items: center;
    justify-content: space-between;

    gap: 30px;
}

.logo {
    font-size: 1.35rem;
    font-weight: 800;
    letter-spacing: 0.16em;
}

.logo span {
    color: var(--accent);
}

.main-nav {
    display: flex;
    align-items: center;
    gap: 28px;
}

.main-nav a {
    position: relative;

    color: var(--text-soft);

    font-size: 0.88rem;
    font-weight: 600;

    transition:
        color 0.2s ease,
        transform 0.2s ease;
}

.main-nav a:hover {
    color: var(--text);
    transform: translateY(-1px);
}

.main-nav a::after {
    content: "";

    position: absolute;
    left: 0;
    bottom: -8px;

    width: 100%;
    height: 1px;

    background: var(--accent);

    transform: scaleX(0);
    transform-origin: left;

    transition: transform 0.2s ease;
}

.main-nav a:hover::after {
    transform: scaleX(1);
}


/* =========================
   HERO
========================= */

.hero {
    padding: 110px 0 90px;

    border-bottom: 1px solid var(--line);
}

.hero-inner {
    max-width: 980px;
}

.eyebrow,
.section-code,
.search-label {
    color: var(--accent);

    font-size: 0.76rem;
    font-weight: 700;

    letter-spacing: 0.16em;

    text-transform: uppercase;
}

.hero h1 {
    max-width: 940px;

    margin-top: 18px;

    font-size: clamp(3rem, 7vw, 6.6rem);
    line-height: 0.98;

    letter-spacing: -0.055em;
}

.hero h1 span {
    display: block;

    margin-top: 12px;

    color: var(--text-soft);

    font-size: 0.48em;
    font-weight: 500;

    line-height: 1.2;

    letter-spacing: -0.025em;
}

.hero-copy {
    max-width: 760px;

    margin-top: 28px;

    color: var(--text-soft);

    font-size: 1.1rem;
}


/* =========================
   SEARCH
========================= */

.search-panel {
    max-width: 850px;

    margin-top: 42px;
    padding: 18px;

    background: var(--panel);

    border: 1px solid var(--line);
    border-radius: var(--radius);
}

.search-label {
    display: block;

    margin-bottom: 11px;
}

#site-search {
    display: grid;

    grid-template-columns: 1fr auto;

    gap: 10px;
}

#search-input {
    min-width: 0;

    padding: 15px 16px;

    color: var(--text);

    background: var(--bg);

    border: 1px solid var(--line-strong);
    border-radius: 7px;

    outline: none;

    transition:
        border-color 0.2s ease,
        box-shadow 0.2s ease;
}

#search-input::placeholder {
    color: var(--text-dim);
}

#search-input:focus {
    border-color: var(--accent);

    box-shadow: 0 0 0 3px var(--accent-soft);
}

#site-search button {
    padding: 15px 22px;

    color: #15120d;

    background: var(--accent);

    border: 1px solid var(--accent);
    border-radius: 7px;

    font-size: 0.8rem;
    font-weight: 800;

    letter-spacing: 0.08em;

    cursor: pointer;

    transition:
        transform 0.2s ease,
        filter 0.2s ease;
}

#site-search button:hover {
    transform: translateY(-1px);
    filter: brightness(1.08);
}


/* =========================
   SECTIONS
========================= */

.directory,
.featured,
.mission {
    padding: 90px 0;
}

.directory,
.featured {
    border-bottom: 1px solid var(--line);
}

.section-heading {
    max-width: 700px;

    margin-bottom: 38px;
}

.section-heading h2 {
    margin-top: 8px;

    font-size: clamp(2rem, 4vw, 3.25rem);

    line-height: 1.08;
    letter-spacing: -0.035em;
}

.section-heading>p:last-child {
    margin-top: 12px;

    color: var(--text-soft);
}


/* =========================
   CATEGORY GRID
========================= */

.category-grid {
    display: grid;

    grid-template-columns: repeat(2, 1fr);

    gap: 18px;
}

.category-card {
    min-height: 280px;

    display: flex;
    flex-direction: column;

    padding: 26px;

    background: var(--panel);

    border: 1px solid var(--line);
    border-radius: var(--radius);

    transition:
        transform 0.22s ease,
        border-color 0.22s ease,
        background 0.22s ease;
}

.category-card:hover {
    transform: translateY(-4px);

    background: var(--panel-hover);

    border-color: var(--accent-border);
}

.card-top {
    display: flex;
    align-items: center;
    justify-content: space-between;

    margin-bottom: 52px;
}

.card-number {
    color: var(--text-dim);

    font-size: 0.78rem;
    font-weight: 700;

    letter-spacing: 0.1em;
}

.card-tag {
    padding: 4px 8px;

    color: var(--accent);

    background: var(--accent-soft);

    border: 1px solid var(--accent-border);
    border-radius: 4px;

    font-size: 0.7rem;
    font-weight: 800;

    letter-spacing: 0.1em;
}

.category-card h3 {
    font-size: 1.55rem;

    letter-spacing: -0.02em;
}

.category-card p {
    max-width: 470px;

    margin-top: 10px;

    color: var(--text-soft);
}

.card-action {
    margin-top: auto;
    padding-top: 28px;

    color: var(--accent);

    font-size: 0.76rem;
    font-weight: 800;

    letter-spacing: 0.09em;
}


/* =========================
   CONTENT CARDS
========================= */

.content-grid {
    display: grid;

    grid-template-columns: repeat(3, 1fr);

    gap: 18px;
}

.content-card {
    min-height: 240px;

    display: flex;
    flex-direction: column;

    padding: 24px;

    background: var(--panel);

    border: 1px solid var(--line);
    border-radius: var(--radius);

    transition:
        transform 0.22s ease,
        border-color 0.22s ease,
        background 0.22s ease;
}

.content-card:hover {
    transform: translateY(-4px);

    background: var(--panel-hover);

    border-color: var(--accent-border);
}

.content-type {
    margin-bottom: 48px;

    color: var(--accent);

    font-size: 0.7rem;
    font-weight: 800;

    letter-spacing: 0.12em;
}

.content-card h3 {
    font-size: 1.28rem;

    line-height: 1.25;
}

.content-card p {
    margin-top: 10px;

    color: var(--text-soft);

    font-size: 0.94rem;
}

.tools-preview {
    background: rgba(255, 255, 255, 0.012);
}


/* =========================
   MISSION
========================= */

.mission {
    background:
        linear-gradient(135deg,
            rgba(240, 164, 58, 0.08),
            transparent 38%);
}

.mission-inner {
    display: grid;

    grid-template-columns: 1fr 1fr;

    gap: 70px;

    align-items: start;
}

.mission h2 {
    max-width: 540px;

    margin-top: 10px;

    font-size: clamp(2rem, 4vw, 3.2rem);

    line-height: 1.05;
    letter-spacing: -0.04em;
}

.mission-inner>p {
    max-width: 570px;

    color: var(--text-soft);

    font-size: 1.05rem;
}


/* =========================
   FOOTER
========================= */

.site-footer {
    padding: 48px 0;

    background: #090b0d;

    border-top: 1px solid var(--line);
}

.footer-inner {
    display: grid;

    grid-template-columns: 1fr auto;
    gap: 32px;

    align-items: start;
}

.footer-logo {
    display: inline-block;

    margin-bottom: 7px;
}

.footer-inner>div:first-child p {
    color: var(--text-dim);

    font-size: 0.86rem;
}

.footer-links {
    display: flex;
    flex-wrap: wrap;

    justify-content: flex-end;

    gap: 22px;
}

.footer-links a {
    color: var(--text-soft);

    font-size: 0.82rem;

    transition: color 0.2s ease;
}

.footer-links a:hover {
    color: var(--accent);
}

.copyright {
    grid-column: 1 / -1;

    padding-top: 24px;

    color: var(--text-dim);

    border-top: 1px solid var(--line);

    font-size: 0.78rem;
}


/* =========================
   RESPONSIVE
========================= */

@media (max-width: 900px) {

    .header-inner {
        min-height: auto;

        padding: 20px 0;

        flex-direction: column;
        align-items: flex-start;
    }

    .main-nav {
        width: 100%;

        gap: 18px;

        overflow-x: auto;

        padding-bottom: 3px;
    }

    .main-nav a {
        white-space: nowrap;
    }

    .hero {
        padding: 80px 0 70px;
    }

    .category-grid,
    .content-grid,
    .mission-inner {
        grid-template-columns: 1fr;
    }

    .mission-inner {
        gap: 30px;
    }

}


@media (max-width: 600px) {

    .container {
        width: min(92%, var(--max-width));
    }

    .hero {
        padding-top: 62px;
    }

    .hero h1 {
        font-size: clamp(2.6rem, 14vw, 4.5rem);
    }

    .hero h1 span {
        font-size: 0.42em;
    }

    .hero-copy {
        font-size: 1rem;
    }

    #site-search {
        grid-template-columns: 1fr;
    }

    #site-search button {
        width: 100%;
    }

    .directory,
    .featured,
    .mission {
        padding: 68px 0;
    }

    .category-card {
        min-height: 240px;
    }

    .content-card {
        min-height: 210px;
    }

    .footer-inner {
        grid-template-columns: 1fr;
    }

    .footer-links {
        justify-content: flex-start;
    }

}

/* =========================
   ACTIVE NAV
========================= */

.main-nav a.active {
    color: var(--text);
}

.main-nav a.active::after {
    transform: scaleX(1);
}


/* =========================
   SUBPAGE HERO
========================= */

.subpage-hero {
    padding: 90px 0 75px;

    border-bottom: 1px solid var(--line);
}

.subpage-hero h1 {
    margin-top: 12px;

    font-size: clamp(3rem, 7vw, 5.5rem);

    line-height: 1;
    letter-spacing: -0.055em;
}

.subpage-intro {
    max-width: 680px;

    margin-top: 20px;

    color: var(--text-soft);

    font-size: 1.15rem;
}


/* =========================
   DIAGNOSTIC SEARCH
========================= */

.diagnostic-search {
    max-width: 850px;

    margin-top: 36px;
    padding: 18px;

    background: var(--panel);

    border: 1px solid var(--line);
    border-radius: var(--radius);
}

#diagnostic-search-form {
    display: grid;

    grid-template-columns: 1fr auto;

    gap: 10px;

    margin-top: 11px;
}

#diagnostic-search-input {
    min-width: 0;

    padding: 15px 16px;

    color: var(--text);

    background: var(--bg);

    border: 1px solid var(--line-strong);
    border-radius: 7px;

    outline: none;
}

#diagnostic-search-input::placeholder {
    color: var(--text-dim);
}

#diagnostic-search-input:focus {
    border-color: var(--accent);

    box-shadow: 0 0 0 3px var(--accent-soft);
}

#diagnostic-search-form button {
    padding: 15px 22px;

    color: #15120d;

    background: var(--accent);

    border: 1px solid var(--accent);
    border-radius: 7px;

    font-size: 0.8rem;
    font-weight: 800;

    letter-spacing: 0.08em;

    cursor: pointer;
}


/* =========================
   DIAGNOSTIC DIRECTORY
========================= */

.diagnostic-directory {
    padding: 90px 0;

    border-bottom: 1px solid var(--line);
}

.diagnostic-system-grid {
    display: grid;

    grid-template-columns: repeat(3, 1fr);

    gap: 18px;
}

.diagnostic-system-card {
    min-height: 260px;

    display: flex;
    flex-direction: column;

    padding: 24px;

    background: var(--panel);

    border: 1px solid var(--line);
    border-radius: var(--radius);

    transition:
        transform 0.22s ease,
        border-color 0.22s ease,
        background 0.22s ease;
}

.diagnostic-system-card:hover {
    transform: translateY(-4px);

    background: var(--panel-hover);

    border-color: var(--accent-border);
}

.system-code {
    margin-bottom: 42px;

    color: var(--accent);

    font-size: 0.72rem;
    font-weight: 800;

    letter-spacing: 0.13em;
}

.diagnostic-system-card h3 {
    font-size: 1.4rem;

    line-height: 1.2;
}

.diagnostic-system-card p {
    margin-top: 10px;

    color: var(--text-soft);

    font-size: 0.94rem;
}


/* =========================
   DIAGNOSTIC GROUPS
========================= */

.diagnostic-group {
    padding: 75px 0;

    border-bottom: 1px solid var(--line);
}

.diagnostic-group:nth-of-type(even) {
    background: rgba(255, 255, 255, 0.012);
}

.diagnostic-group-header {
    display: grid;

    grid-template-columns: 1fr 1fr;

    gap: 50px;

    align-items: end;

    margin-bottom: 30px;
}

.diagnostic-group-header h2 {
    margin-top: 6px;

    font-size: clamp(2rem, 4vw, 3rem);

    line-height: 1.05;

    letter-spacing: -0.04em;
}

.diagnostic-group-header>p {
    max-width: 500px;

    color: var(--text-soft);
}

.diagnostic-link-grid {
    display: grid;

    grid-template-columns: repeat(2, 1fr);

    gap: 12px;
}

.diagnostic-link {
    display: flex;

    align-items: center;

    gap: 18px;

    min-height: 68px;

    padding: 16px 18px;

    background: var(--panel);

    border: 1px solid var(--line);
    border-radius: 7px;

    font-weight: 600;

    transition:
        transform 0.18s ease,
        background 0.18s ease,
        border-color 0.18s ease;
}

.diagnostic-link span {
    min-width: 28px;

    color: var(--accent);

    font-size: 0.7rem;
    font-weight: 800;

    letter-spacing: 0.1em;
}

.diagnostic-link:hover {
    transform: translateX(4px);

    background: var(--panel-hover);

    border-color: var(--accent-border);
}


/* =========================
   DIAGNOSTICS RESPONSIVE
========================= */

@media (max-width: 900px) {

    .diagnostic-system-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .diagnostic-group-header {
        grid-template-columns: 1fr;

        gap: 15px;
    }

}


@media (max-width: 650px) {

    .subpage-hero {
        padding: 65px 0 55px;
    }

    #diagnostic-search-form {
        grid-template-columns: 1fr;
    }

    .diagnostic-system-grid,
    .diagnostic-link-grid {
        grid-template-columns: 1fr;
    }

    .diagnostic-directory,
    .diagnostic-group {
        padding: 60px 0;
    }

}

/* =========================
   TOOLS DIRECTORY
========================= */

.tools-directory {
    padding: 90px 0;

    border-bottom: 1px solid var(--line);
}

.tool-directory-grid {
    display: grid;

    grid-template-columns: repeat(2, 1fr);

    gap: 18px;
}

.tool-directory-card {
    min-height: 270px;

    display: flex;
    flex-direction: column;

    padding: 26px;

    background: var(--panel);

    border: 1px solid var(--line);
    border-radius: var(--radius);

    transition:
        transform 0.22s ease,
        border-color 0.22s ease,
        background 0.22s ease;
}

.tool-directory-card:hover {
    transform: translateY(-4px);

    background: var(--panel-hover);

    border-color: var(--accent-border);
}

.tool-directory-top {
    display: flex;
    align-items: center;
    justify-content: space-between;

    gap: 20px;

    margin-bottom: 48px;
}

.tool-id {
    color: var(--accent);

    font-size: 0.72rem;
    font-weight: 800;

    letter-spacing: 0.12em;
}

.tool-status {
    padding: 4px 8px;

    color: var(--text-dim);

    border: 1px solid var(--line-strong);
    border-radius: 4px;

    font-size: 0.64rem;
    font-weight: 800;

    letter-spacing: 0.08em;
}

.tool-directory-card h3 {
    font-size: 1.45rem;

    line-height: 1.2;
    letter-spacing: -0.02em;
}

.tool-directory-card p {
    max-width: 500px;

    margin-top: 10px;

    color: var(--text-soft);
}

.tool-directory-card .card-action {
    margin-top: auto;
}


/* =========================
   TOOL PHILOSOPHY
========================= */

.tool-philosophy {
    padding: 85px 0;

    background:
        linear-gradient(135deg,
            rgba(240, 164, 58, 0.07),
            transparent 40%);
}

.tool-philosophy-inner {
    display: grid;

    grid-template-columns: 1fr 1fr;

    gap: 70px;

    align-items: start;
}

.tool-philosophy h2 {
    margin-top: 8px;

    font-size: clamp(2rem, 4vw, 3rem);

    line-height: 1.05;

    letter-spacing: -0.04em;
}

.tool-philosophy-inner>p {
    max-width: 570px;

    color: var(--text-soft);

    font-size: 1.05rem;
}


/* =========================
   TOOLS RESPONSIVE
========================= */

@media (max-width: 800px) {

    .tool-directory-grid,
    .tool-philosophy-inner {
        grid-template-columns: 1fr;
    }

    .tool-philosophy-inner {
        gap: 28px;
    }

}

@media (max-width: 600px) {

    .tools-directory,
    .tool-philosophy {
        padding: 60px 0;
    }

    .tool-directory-card {
        min-height: 235px;
    }

}

/* =========================
   CALCULATOR PAGE
========================= */

.calculator-section {
    padding: 80px 0;

    border-bottom: 1px solid var(--line);
}

.calculator-layout {
    display: grid;

    grid-template-columns: 1fr 1fr;

    gap: 20px;
}

.calculator-panel,
.calculator-results {
    padding: 28px;

    background: var(--panel);

    border: 1px solid var(--line);
    border-radius: var(--radius);
}

.calculator-field {
    margin-top: 24px;
}

.calculator-field label {
    display: block;

    margin-bottom: 8px;

    color: var(--text-soft);

    font-size: 0.86rem;
    font-weight: 700;
}

.input-unit-group {
    display: grid;

    grid-template-columns: 1fr auto;
}

.input-unit-group input {
    width: 100%;

    padding: 16px;

    color: var(--text);

    background: var(--bg);

    border: 1px solid var(--line-strong);
    border-radius: 7px 0 0 7px;

    outline: none;
}

.input-unit-group input:focus {
    border-color: var(--accent);

    box-shadow: 0 0 0 3px var(--accent-soft);
}

.input-unit-group span {
    min-width: 55px;

    display: flex;
    align-items: center;
    justify-content: center;

    color: var(--text-soft);

    background: var(--bg-soft);

    border:
        1px solid var(--line-strong);
    border-left: 0;

    border-radius: 0 7px 7px 0;

    font-weight: 700;
}

.calculator-button {
    width: 100%;

    margin-top: 28px;
    padding: 16px;

    color: #15120d;

    background: var(--accent);

    border: 0;
    border-radius: 7px;

    font-size: 0.82rem;
    font-weight: 800;

    letter-spacing: 0.1em;

    cursor: pointer;
}

.calculator-button:hover {
    filter: brightness(1.08);
}

.result-block,
.result-status {
    padding: 22px 0;

    border-bottom: 1px solid var(--line);
}

.result-block strong,
.result-status strong {
    display: block;

    margin-top: 5px;

    font-size: 2rem;

    line-height: 1;
}

.result-status strong {
    color: var(--accent);

    font-size: 1.2rem;
}

.result-label {
    color: var(--text-dim);

    font-size: 0.7rem;
    font-weight: 800;

    letter-spacing: 0.12em;
}

.result-status p {
    margin-top: 12px;

    color: var(--text-soft);
}


/* =========================
   TOOL INFORMATION
========================= */

.tool-information {
    padding: 85px 0;

    border-bottom: 1px solid var(--line);
}

.information-grid {
    display: grid;

    grid-template-columns: repeat(3, 1fr);

    gap: 18px;
}

.information-card {
    padding: 24px;

    background: var(--panel);

    border: 1px solid var(--line);
    border-radius: var(--radius);
}

.information-card h3 {
    font-size: 1.2rem;
}

.information-card p {
    margin-top: 10px;

    color: var(--text-soft);

    font-size: 0.94rem;
}


/* =========================
   FORMULA SECTION
========================= */

.formula-section {
    padding: 80px 0;
}

.formula-inner {
    display: grid;

    grid-template-columns: 1fr 1fr;

    gap: 60px;

    align-items: center;
}

.formula-inner h2 {
    margin-top: 8px;

    font-size: clamp(2rem, 4vw, 3rem);

    line-height: 1.05;
}

.formula-box {
    padding: 28px;

    background: var(--panel);

    border: 1px solid var(--line);
    border-radius: var(--radius);
}

.formula-box code {
    color: var(--accent);

    font-size: 1rem;
}

.formula-box p {
    margin-top: 14px;

    color: var(--text-soft);
}


/* =========================
   CALCULATOR RESPONSIVE
========================= */

@media (max-width: 800px) {

    .calculator-layout,
    .information-grid,
    .formula-inner {
        grid-template-columns: 1fr;
    }

}

/* =========================
   TIRE SIZE CALCULATOR
========================= */

.tire-calculator-grid {
    display: grid;

    grid-template-columns: repeat(2, 1fr);

    gap: 20px;
}

.tire-input-row {
    display: grid;

    grid-template-columns: repeat(3, 1fr);

    gap: 14px;
}

.tire-calculate-button {
    max-width: 420px;

    display: block;

    margin: 24px auto 40px;
}

.tire-results-grid {
    display: grid;

    grid-template-columns: repeat(3, 1fr);

    gap: 20px;
}

.tire-results-grid .result-block strong {
    font-size: 1.55rem;
}

.tire-comparison-panel {
    border-color: var(--accent-border);

    background:
        linear-gradient(145deg,
            rgba(240, 164, 58, 0.045),
            var(--panel) 45%);
}


@media (max-width: 1000px) {

    .tire-results-grid {
        grid-template-columns: 1fr 1fr;
    }

    .tire-comparison-panel {
        grid-column: 1 / -1;
    }

}


@media (max-width: 800px) {

    .tire-calculator-grid,
    .tire-results-grid {
        grid-template-columns: 1fr;
    }

    .tire-comparison-panel {
        grid-column: auto;
    }

}


@media (max-width: 600px) {

    .tire-input-row {
        grid-template-columns: 1fr;
    }

}

/* =========================
   OHM'S LAW CALCULATOR
========================= */

.calculator-instruction {
    margin-top: 12px;
    margin-bottom: 4px;

    color: var(--text-soft);

    font-size: 0.9rem;
}

.calculator-reset-button {
    width: 100%;

    margin-top: 10px;
    padding: 14px;

    color: var(--text-soft);

    background: transparent;

    border: 1px solid var(--line-strong);
    border-radius: 7px;

    font-size: 0.76rem;
    font-weight: 800;

    letter-spacing: 0.09em;

    cursor: pointer;

    transition:
        color 0.2s ease,
        border-color 0.2s ease,
        background 0.2s ease;
}

.calculator-reset-button:hover {
    color: var(--text);

    background: var(--panel-hover);

    border-color: var(--accent-border);
}

.ohm-second-row {
    margin-top: 18px;
}

.ohm-formula-list {
    display: flex;
    flex-direction: column;

    gap: 14px;
}

.ohm-formula-list code {
    display: block;

    padding-bottom: 10px;

    border-bottom: 1px solid var(--line);
}

/* =========================
   HOMEPAGE TOOL GRID
========================= */

.tools-home-grid {
    grid-template-columns: repeat(3, 1fr);
}

@media (max-width: 900px) {

    .tools-home-grid {
        grid-template-columns: repeat(2, 1fr);
    }

}

@media (max-width: 600px) {

    .tools-home-grid {
        grid-template-columns: 1fr;
    }

}

/* =========================
   CALCULATOR SELECT
========================= */

.calculator-select {
    width: 100%;

    padding: 16px;

    color: var(--text);

    background: var(--bg);

    border: 1px solid var(--line-strong);
    border-radius: 7px;

    outline: none;

    cursor: pointer;

    appearance: none;

    transition:
        border-color 0.2s ease,
        box-shadow 0.2s ease;
}

.calculator-select:focus {
    border-color: var(--accent);

    box-shadow: 0 0 0 3px var(--accent-soft);
}

.calculator-select option {
    color: var(--text);

    background: var(--bg);
}

/* =========================
   CALCULATOR FIELD NOTES
========================= */

.field-note {
    margin-top: 7px;

    color: var(--text-dim);

    font-size: 0.78rem;

    line-height: 1.45;
}

/* =========================
   OBD-II HUB
========================= */

.obd-search-panel {
    max-width: 850px;

    margin-top: 38px;
    padding: 18px;

    background: var(--panel);

    border: 1px solid var(--line);
    border-radius: var(--radius);
}

#obd-search-form {
    display: grid;

    grid-template-columns: 1fr auto;

    gap: 10px;

    margin-top: 11px;
}

#obd-search-input {
    min-width: 0;

    padding: 15px 16px;

    color: var(--text);

    background: var(--bg);

    border: 1px solid var(--line-strong);
    border-radius: 7px;

    text-transform: uppercase;

    outline: none;
}

#obd-search-input:focus {
    border-color: var(--accent);

    box-shadow: 0 0 0 3px var(--accent-soft);
}

#obd-search-form button {
    padding: 15px 22px;

    color: #15120d;

    background: var(--accent);

    border: 0;
    border-radius: 7px;

    font-size: 0.8rem;
    font-weight: 800;

    letter-spacing: 0.08em;

    cursor: pointer;
}

.obd-search-message {
    margin-top: 10px;

    color: var(--text-dim);

    font-size: 0.8rem;
}


/* =========================
   OBD FAMILIES
========================= */

.obd-family-grid {
    display: grid;

    grid-template-columns: repeat(2, 1fr);

    gap: 18px;
}

.obd-family-card {
    display: grid;

    grid-template-columns: auto 1fr;

    gap: 22px;

    padding: 26px;

    background: var(--panel);

    border: 1px solid var(--line);
    border-radius: var(--radius);
}

.obd-family-letter {
    width: 58px;
    height: 58px;

    display: flex;
    align-items: center;
    justify-content: center;

    color: var(--accent);

    background: var(--accent-soft);

    border: 1px solid var(--accent-border);
    border-radius: 7px;

    font-size: 1.6rem;
    font-weight: 800;
}

.obd-family-card h3 {
    font-size: 1.25rem;
}

.obd-family-card p {
    margin-top: 6px;

    color: var(--text-soft);
}


/* =========================
   OBD STRUCTURE
========================= */

.obd-structure-section {
    padding: 85px 0;

    border-bottom: 1px solid var(--line);
}

.obd-example {
    padding: 28px;

    background: var(--panel);

    border: 1px solid var(--line);
    border-radius: var(--radius);
}

.obd-example-code {
    display: flex;

    gap: 10px;

    margin-bottom: 28px;
}

.obd-example-code span {
    width: 64px;
    height: 70px;

    display: flex;
    align-items: center;
    justify-content: center;

    color: var(--accent);

    background: var(--bg);

    border: 1px solid var(--line-strong);
    border-radius: 7px;

    font-size: 2rem;
    font-weight: 800;
}

.obd-digit-grid {
    display: grid;

    grid-template-columns: repeat(4, 1fr);

    gap: 14px;
}

.obd-digit-grid>div {
    padding: 18px;

    background: var(--bg-soft);

    border: 1px solid var(--line);
    border-radius: 7px;
}

.obd-digit-grid strong {
    display: block;

    color: var(--accent);

    font-size: 1.25rem;
}

.obd-digit-grid span {
    display: block;

    margin-top: 4px;

    color: var(--text);

    font-size: 0.78rem;
    font-weight: 700;
}

.obd-digit-grid p {
    margin-top: 7px;

    color: var(--text-soft);

    font-size: 0.86rem;
}


/* =========================
   COMMON OBD CODES
========================= */

.common-obd-section {
    padding: 90px 0;

    border-bottom: 1px solid var(--line);
}

.obd-code-grid {
    display: grid;

    grid-template-columns: repeat(2, 1fr);

    gap: 18px;
}

.obd-code-card {
    min-height: 255px;

    display: flex;
    flex-direction: column;

    padding: 25px;

    background: var(--panel);

    border: 1px solid var(--line);
    border-radius: var(--radius);

    transition:
        transform 0.22s ease,
        border-color 0.22s ease,
        background 0.22s ease;
}

.obd-code-card:hover {
    transform: translateY(-4px);

    background: var(--panel-hover);

    border-color: var(--accent-border);
}

.obd-code {
    margin-bottom: 34px;

    color: var(--accent);

    font-size: 0.82rem;
    font-weight: 800;

    letter-spacing: 0.14em;
}

.obd-code-card h3 {
    font-size: 1.25rem;

    line-height: 1.25;
}

.obd-code-card p {
    margin-top: 10px;

    color: var(--text-soft);
}

.obd-code-card .card-action {
    margin-top: auto;
}


/* =========================
   OBD RESPONSIVE
========================= */

@media (max-width: 800px) {

    .obd-family-grid,
    .obd-code-grid {
        grid-template-columns: 1fr;
    }

    .obd-digit-grid {
        grid-template-columns: repeat(2, 1fr);
    }

}

@media (max-width: 600px) {

    #obd-search-form {
        grid-template-columns: 1fr;
    }

    .obd-example-code span {
        width: 52px;
        height: 60px;

        font-size: 1.6rem;
    }

    .obd-digit-grid {
        grid-template-columns: 1fr;
    }

}

/* =========================
   OBD CODE PAGE
========================= */

.obd-code-hero {
    padding: 85px 0 70px;

    border-bottom: 1px solid var(--line);
}

.obd-code-heading {
    display: flex;

    align-items: flex-start;

    gap: 24px;
}

.obd-code-badge {
    min-width: 110px;

    padding: 15px 18px;

    color: var(--accent);

    background: var(--accent-soft);

    border: 1px solid var(--accent-border);
    border-radius: 7px;

    font-size: 1.5rem;
    font-weight: 800;

    letter-spacing: 0.08em;

    text-align: center;
}

.obd-code-heading h1 {
    margin-top: 7px;

    max-width: 850px;

    font-size: clamp(2.5rem, 6vw, 5rem);

    line-height: 1;

    letter-spacing: -0.05em;
}

.obd-summary-grid {
    display: grid;

    grid-template-columns: repeat(4, 1fr);

    gap: 14px;

    margin-top: 38px;
}

.obd-summary-card {
    padding: 18px;

    background: var(--panel);

    border: 1px solid var(--line);
    border-radius: 7px;
}

.obd-summary-card span {
    display: block;

    color: var(--text-dim);

    font-size: 0.68rem;
    font-weight: 800;

    letter-spacing: 0.11em;
}

.obd-summary-card strong {
    display: block;

    margin-top: 7px;

    font-size: 0.96rem;
}

.severity-high {
    color: var(--accent);
}


/* =========================
   OBD DETAIL SECTIONS
========================= */

.obd-detail-section {
    padding: 75px 0;

    border-bottom: 1px solid var(--line);
}

.obd-detail-layout {
    display: grid;

    grid-template-columns: 0.8fr 1.2fr;

    gap: 70px;
}

.obd-detail-layout h2 {
    margin-top: 7px;

    font-size: clamp(2rem, 4vw, 3rem);

    line-height: 1.05;

    letter-spacing: -0.04em;
}

.obd-detail-layout>div:last-child {
    color: var(--text-soft);
}

.obd-detail-layout>div:last-child p+p {
    margin-top: 18px;
}


/* =========================
   SYMPTOM CHECK GRID
========================= */

.obd-check-grid {
    display: grid;

    grid-template-columns: repeat(2, 1fr);

    gap: 12px;
}

.obd-check-item {
    padding: 16px 18px;

    background: var(--panel);

    border: 1px solid var(--line);
    border-radius: 7px;

    font-weight: 600;
}

.obd-check-item::before {
    content: "→";

    margin-right: 12px;

    color: var(--accent);
}


/* =========================
   CAUSE CARDS
========================= */

.obd-cause-grid {
    display: grid;

    grid-template-columns: repeat(2, 1fr);

    gap: 18px;
}

.obd-cause-card {
    padding: 24px;

    background: var(--panel);

    border: 1px solid var(--line);
    border-radius: var(--radius);
}

.obd-cause-card>span {
    color: var(--accent);

    font-size: 0.7rem;
    font-weight: 800;

    letter-spacing: 0.12em;
}

.obd-cause-card h3 {
    margin-top: 24px;

    font-size: 1.25rem;
}

.obd-cause-card p {
    margin-top: 8px;

    color: var(--text-soft);
}


/* =========================
   DIAGNOSTIC STEPS
========================= */

.diagnostic-steps {
    display: flex;

    flex-direction: column;

    gap: 12px;
}

.diagnostic-step {
    display: grid;

    grid-template-columns: auto 1fr;

    gap: 22px;

    padding: 22px;

    background: var(--panel);

    border: 1px solid var(--line);
    border-radius: 7px;
}

.diagnostic-step-number {
    width: 46px;
    height: 46px;

    display: flex;
    align-items: center;
    justify-content: center;

    color: var(--accent);

    background: var(--accent-soft);

    border: 1px solid var(--accent-border);
    border-radius: 6px;

    font-size: 0.72rem;
    font-weight: 800;
}

.diagnostic-step h3 {
    font-size: 1.1rem;
}

.diagnostic-step p {
    margin-top: 6px;

    color: var(--text-soft);
}


/* =========================
   OBD WARNING
========================= */

.obd-warning-box {
    padding: 30px;

    background:
        linear-gradient(135deg,
            rgba(240, 164, 58, 0.08),
            var(--panel));

    border: 1px solid var(--accent-border);
    border-radius: var(--radius);
}

.obd-warning-box h2 {
    margin-top: 8px;

    font-size: clamp(2rem, 4vw, 3rem);

    line-height: 1.05;
}

.obd-warning-box>p:last-child {
    max-width: 850px;

    margin-top: 18px;

    color: var(--text-soft);
}


/* =========================
   OBD CODE RESPONSIVE
========================= */

@media (max-width: 900px) {

    .obd-summary-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .obd-detail-layout {
        grid-template-columns: 1fr;

        gap: 25px;
    }

}


@media (max-width: 650px) {

    .obd-code-heading {
        flex-direction: column;
    }

    .obd-summary-grid,
    .obd-check-grid,
    .obd-cause-grid {
        grid-template-columns: 1fr;
    }

}