/* AquaDzannn CO2 calculator
   Visual system synchronized with the aquarium glass calculator. */

:root {
    --radius-xl: 22px;
    --radius-lg: 22px;
    --radius-md: 17px;
    --font: Roboto, Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;

    --blue: #5f8f82;
    --green: #52977f;
    --yellow: #d9b77f;
    --orange: #c58a5e;
    --red: #d17878;
}

:root[data-bs-theme="light"] {
    --body-color: #16231f;
    --heading: #173d34;
    --muted: #697771;
    --muted-2: #7f8d87;

    --page-bg: radial-gradient(circle at top left, rgba(30, 127, 104, .10), transparent 26rem),
    linear-gradient(180deg, #f3f8f5 0%, #eef4f1 100%);

    --surface: rgba(255, 255, 255, .90);
    --surface-solid: #ffffff;
    --surface-muted: #f6faf8;
    --input-bg: #fbfdfc;
    --floating-bg: rgba(255, 255, 255, .90);
    --table-head: #f0f6f3;

    --border: #d8e3de;
    --border-strong: #9bcfbc;

    --accent: #1e7f68;
    --accent-alt: #3b9078;
    --accent-rgb: 30, 127, 104;
    --accent-text: #0f5d4b;
    --accent-soft: rgba(30, 127, 104, .10);
    --glow: rgba(30, 127, 104, .16);

    --warning-bg: #fff5ea;
    --warning-border: #e5c99f;
    --warning-text: #87561c;

    --danger-bg: #fff2f2;
    --danger-border: #e3bcbc;
    --danger-text: #963f3f;

    --shadow: 0 16px 42px rgba(22, 35, 31, .08);
    --shadow-sm: 0 16px 42px rgba(22, 35, 31, .08);
}

:root[data-bs-theme="dark"] {
    --body-color: #dce8e3;
    --heading: #edf5f1;
    --muted: #99aaa3;
    --muted-2: #7f918a;

    --page-bg: radial-gradient(circle at top left, rgba(55, 126, 103, .12), transparent 28rem),
    linear-gradient(180deg, #111b17 0%, #0c1512 100%);

    --surface: rgba(20, 32, 28, .92);
    --surface-solid: #17251f;
    --surface-muted: #1b2b25;
    --input-bg: #14211c;
    --floating-bg: rgba(19, 31, 27, .94);
    --table-head: #1d3028;

    --border: #2b4037;
    --border-strong: #4e7f6d;

    --accent: #52977f;
    --accent-alt: #39765f;
    --accent-rgb: 82, 151, 127;
    --accent-text: #a8d3c3;
    --accent-soft: rgba(82, 151, 127, .10);
    --glow: rgba(48, 111, 90, .18);

    --warning-bg: #30271b;
    --warning-border: #665238;
    --warning-text: #d9b77f;

    --danger-bg: #312020;
    --danger-border: #633d3d;
    --danger-text: #dca1a1;

    --shadow: 0 16px 42px rgba(0, 0, 0, .22);
    --shadow-sm: 0 16px 42px rgba(0, 0, 0, .22);
}

* {
    box-sizing: border-box;
}

html {
    min-width: 320px;
}

body {
    min-height: 100vh;
    margin: 0;
    background: var(--page-bg);
    background-attachment: fixed;
    color: var(--body-color);
    font-family: var(--font);
    line-height: 1.6;
}


body.theme-transition,
body.theme-transition * {
    transition: background-color .35s ease, color .2s ease, border-color .35s ease, box-shadow .35s ease !important;
}

button,
input {
    font: inherit;
}

a {
    color: inherit;
}

.page-shell {
    width: min(1180px, calc(100% - 24px));
    margin: 0 auto;
    padding: 0 0 60px;
}


/* Brand */

.app-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    flex: 0 0 auto;
    text-decoration: none;
}

.app-brand-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    padding: 7px;
    overflow: hidden;
    border-radius: 16px;
    background: linear-gradient(135deg, var(--accent), var(--accent-alt));
    box-shadow: 0 12px 30px var(--glow);
}

.app-brand-logo {
    display: block;
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.app-brand-title {
    display: block;
    color: #f4faf7;
    font-weight: 850;
    line-height: 1.05;
    letter-spacing: -.03em;
}

.app-brand-subtitle {
    display: block;
    margin-top: 3px;
    color: rgba(244, 250, 247, .68);
    font-size: .76rem;
    line-height: 1.1;
}

/* Header */

.tool-header {
    padding: 32px 0 22px;
}

.tool-header-card {
    position: relative;
    overflow: hidden;
    padding: 34px;
    border-radius: 32px;
    background: linear-gradient(135deg, #173d34 0%, #1c6757 100%);
    color: #fff;
    box-shadow: var(--shadow-sm);
}

.tool-header-card::before {
    content: "";
    position: absolute;
    right: -120px;
    top: -90px;
    width: 320px;
    height: 320px;
    border-radius: 50%;
    background: rgba(255, 255, 255, .09);
}

.eyebrow {
    position: relative;
    z-index: 1;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.tool-header h1 {
    position: relative;
    z-index: 1;
    max-width: 820px;
    margin: 16px 0 12px;
    color: #fff;
    font-size: clamp(34px, 5vw, 58px);
    line-height: 1.03;
    letter-spacing: -.045em;
}

.tool-header p {
    position: relative;
    z-index: 1;
    max-width: 900px;
    margin: 0 0 14px;
    color: rgba(255, 255, 255, .83);
    font-size: 17px;
    line-height: 1.6;
}

.overline {
    color: rgba(255, 255, 255, .76);
}


main {
    display: grid;
    gap: 18px;
}

.panel {
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    background: var(--surface);
    box-shadow: var(--shadow-sm);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
}

.calculator-panel,
.targets-panel,
.reliability-panel,
.source-panel {
    padding: clamp(24px, 4vw, 42px);
}

.section-head {
    display: grid;
    grid-template-columns: minmax(0, .85fr) minmax(320px, 1fr);
    gap: 40px;
    align-items: end;
    padding-bottom: 27px;
    border-bottom: 1px solid var(--border);
}

.section-head h2,
.reliability-head h2,
.source-copy h2 {
    margin: 0;
    font-size: clamp(27px, 4vw, 39px);
    line-height: 1.08;
    letter-spacing: -.035em;
}

.section-head > p,
.reliability-copy,
.source-copy p {
    margin: 0;
    color: var(--muted);
    line-height: 1.7;
}

.calculator-form {
    padding-top: 29px;
}

.fields-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 14px;
}

.field {
    display: flex;
    flex-direction: column;
    gap: 9px;
}

.field-label {
    font-size: 14px;
    font-weight: 780;
}

.input-wrap {
    position: relative;
    display: block;
}

.input-wrap input {
    width: 100%;
    height: 58px;
    padding: 0 78px 0 16px;
    border: 1px solid var(--border);
    border-radius: 16px;
    outline: none;
    background: var(--input-bg);
    color: var(--body-color);
    font-size: 20px;
    font-weight: 680;
    box-shadow: none;
    transition: border-color .18s ease, box-shadow .18s ease, background .18s ease;
}

.input-wrap input:focus {
    border-color: rgba(var(--accent-rgb), .60);
    box-shadow: 0 0 0 .22rem rgba(var(--accent-rgb), .11);
}

.unit {
    position: absolute;
    right: 16px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--muted-2);
    font-size: 13px;
    font-weight: 800;
}

.field-help {
    color: var(--muted-2);
    font-size: 12px;
    line-height: 1.5;
}

.check-card {
    margin-top: 20px;
    display: flex;
    align-items: flex-start;
    gap: 13px;
    padding: 17px;
    border: 1px solid var(--border);
    border-radius: 20px;
    background: var(--surface-muted);
    cursor: pointer;
}

.check-card input {
    position: absolute;
    opacity: 0;
    pointer-events: none;
}

.check-control {
    position: relative;
    flex: 0 0 22px;
    width: 22px;
    height: 22px;
    margin-top: 2px;
    border: 1px solid var(--border-strong);
    border-radius: 7px;
    background: var(--surface-solid);
}

.check-card input:checked + .check-control {
    border-color: var(--accent-text);
    background: linear-gradient(135deg, var(--accent), var(--accent-alt));
}

.check-card input:checked + .check-control::after {
    content: "";
    position: absolute;
    left: 6px;
    top: 3px;
    width: 6px;
    height: 10px;
    border-right: 2px solid #06201f;
    border-bottom: 2px solid #06201f;
    transform: rotate(45deg);
}

.check-card strong {
    display: block;
    margin-bottom: 4px;
    font-size: 14px;
    color: var(--body-color);
}

.check-card small {
    display: block;
    color: var(--muted);
    line-height: 1.55;
}

.form-actions {
    display: flex;
    align-items: center;
    gap: 17px;
    margin-top: 22px;
}

.form-actions p {
    margin: 0;
    color: var(--muted-2);
    font-size: 13px;
}

.primary-button {
    min-height: 52px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 10px 20px;
    border: 1px solid transparent;
    border-radius: 18px;
    background: linear-gradient(135deg, var(--accent), var(--accent-alt));
    color: #fff;
    font-weight: 800;
    letter-spacing: -.01em;
    cursor: pointer;
    text-decoration: none;
    box-shadow: 0 12px 26px rgba(var(--accent-rgb), .20);
    transition: transform .18s ease, box-shadow .18s ease;
}

.primary-button:hover {
    transform: translateY(-1px);
    box-shadow: 0 16px 34px rgba(var(--accent-rgb), .26);
}

.primary-button svg {
    width: 20px;
    height: 20px;
}

.alert {
    margin-top: 22px;
    padding: 16px 18px;
    border-radius: 15px;
}

.alert--error {
    border: 1px solid color-mix(in srgb, var(--red) 35%, transparent);
    background: color-mix(in srgb, var(--red) 10%, transparent);
}

.alert strong {
    display: block;
    margin-bottom: 7px;
}

.alert ul {
    margin: 0;
    padding-left: 20px;
    color: var(--muted);
}

.results {
    display: grid;
    gap: 18px;
    scroll-margin-top: 18px;
}

.result-hero {
    position: relative;
    overflow: hidden;
    display: grid;
    grid-template-columns: minmax(0, 1fr) 330px;
    gap: 28px;
    padding: clamp(27px, 5vw, 42px);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    background: radial-gradient(circle at 88% 18%, rgba(var(--accent-rgb), .11), transparent 28rem),
    var(--surface);
    box-shadow: var(--shadow-sm);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
}

.result-hero--very-low,
.result-hero--low {
    --status-color: #6f9b8e;
}

.result-hero--moderate {
    --status-color: var(--accent);
}

.result-hero--balanced {
    --status-color: var(--accent-text);
}

.result-hero--high {
    --status-color: var(--warning-text);
}

.result-hero--near-limit {
    --status-color: #c58a5e;
}

.result-hero--over {
    --status-color: var(--danger-text);
}

.result-main {
    min-width: 0;
}

.co2-reading {
    display: flex;
    align-items: baseline;
    flex-wrap: wrap;
    gap: 12px;
    margin-top: 9px;
}

.co2-reading strong {
    color: var(--status-color);
    font-size: clamp(65px, 10vw, 112px);
    line-height: .88;
    letter-spacing: -.075em;
}

.co2-reading span {
    color: var(--muted);
    font-size: 18px;
    font-weight: 760;
}


.co2-scale {
    max-width: 720px;
    margin-top: 30px;
    padding: 16px 17px 14px;
    border: 1px solid var(--border);
    border-radius: 18px;
    background: var(--surface-muted);
}

.co2-scale-track {
    position: relative;
    display: grid;
    grid-template-columns: 17.5fr 20fr 12.5fr 25fr 25fr;
    height: 12px;
    overflow: visible;
    border-radius: 999px;
    box-shadow: inset 0 0 0 1px rgba(255, 255, 255, .05);
}

.co2-zone {
    display: block;
    min-width: 0;
}

.co2-zone:first-child {
    border-radius: 999px 0 0 999px;
}

.co2-zone:last-of-type {
    border-radius: 0 999px 999px 0;
}

.co2-zone--low {
    background: #6f9b8e;
}

.co2-zone--moderate {
    background: #4f8f78;
}

.co2-zone--balanced {
    background: var(--accent);
}

.co2-zone--high {
    background: #b79a66;
}

.co2-zone--danger {
    background: #ad6868;
}

.co2-marker {
    position: absolute;
    top: 50%;
    z-index: 3;
    transform: translate(-50%, -50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    pointer-events: none;
}

.co2-marker-dot {
    width: 20px;
    height: 20px;
    border: 4px solid var(--surface-solid);
    border-radius: 50%;
    background: var(--body-color);
    box-shadow: 0 0 0 2px rgba(255, 255, 255, .16),
    0 5px 16px rgba(0, 0, 0, .32);
}

.co2-marker-label {
    position: absolute;
    bottom: 17px;
    padding: 4px 7px;
    border: 1px solid var(--border-strong);
    border-radius: 8px;
    background: var(--surface-solid);
    color: var(--body-color);
    font-size: 11px;
    font-weight: 900;
    line-height: 1;
    white-space: nowrap;
    box-shadow: 0 8px 20px rgba(0, 0, 0, .18);
}

.co2-scale-labels {
    position: relative;
    height: 16px;
    margin-top: 9px;
    color: var(--muted-2);
    font-size: 10px;
    font-weight: 760;
}

.co2-scale-labels span {
    position: absolute;
    top: 0;
    transform: translateX(-50%);
}

.co2-scale-labels span:nth-child(1) {
    left: 0;
    transform: none;
}

.co2-scale-labels span:nth-child(2) {
    left: 17.5%;
}

.co2-scale-labels span:nth-child(3) {
    left: 37.5%;
}

.co2-scale-labels span:nth-child(4) {
    left: 50%;
}

.co2-scale-labels span:nth-child(5) {
    left: 75%;
}

.co2-scale-labels span:nth-child(6) {
    right: 0;
    transform: none;
}

.co2-scale-legend {
    display: flex;
    flex-wrap: wrap;
    gap: 8px 14px;
    margin-top: 13px;
    color: var(--muted);
    font-size: 11px;
}

.co2-scale-legend span {
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.legend-dot {
    width: 8px;
    height: 8px;
    display: inline-block;
    border-radius: 50%;
}

.legend-dot--low {
    background: var(--blue);
}

.legend-dot--moderate {
    background: var(--green);
}

.legend-dot--balanced {
    background: linear-gradient(135deg, var(--accent), var(--accent-alt));
}

.legend-dot--high {
    background: var(--yellow);
}

.legend-dot--danger {
    background: var(--red);
}

.result-main h2 {
    margin: 0 0 8px;
    font-size: clamp(26px, 4vw, 38px);
    letter-spacing: -.035em;
}

.result-main > p {
    max-width: 690px;
    color: var(--muted);
    line-height: 1.7;
    margin: 30px 0 0;
}

.result-meta {
    align-self: stretch;
    display: grid;
    grid-template-rows: repeat(3, 1fr);
    border: 1px solid var(--border);
    border-radius: 22px;
    overflow: hidden;
    background: var(--surface-muted);
}

.result-meta div {
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    padding: 18px 20px;
}

.result-meta div + div {
    border-top: 1px solid var(--border);
}

.result-meta span {
    color: var(--muted-2);
    font-size: 11px;
    font-weight: 850;
    letter-spacing: .08em;
    text-transform: uppercase;
}

.result-meta strong {
    font-size: 19px;
}

.recommendation-card,
.buffer-card {
    padding: clamp(23px, 4vw, 34px);
}

.card-icon {
    width: 48px;
    height: 48px;
    display: grid;
    place-items: center;
    border: 1px solid var(--border);
    border-radius: 15px;
    background: var(--accent-soft);
    color: var(--accent-text);
}

.card-icon svg {
    width: 25px;
    height: 25px;
}

.recommendation-card h3,
.buffer-card h3 {
    margin: 0;
    font-size: 25px;
    letter-spacing: -.025em;
}

.recommendation-card-title,
.buffer-card-title {
    display: inline-flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 25px;
}

.recommendation-card > p,
.buffer-card > p {
    margin: 0;
    color: var(--muted);
    line-height: 1.7;
}

.target-callout {
    margin-top: 25px;
    padding: 18px;
    border: 1px solid color-mix(in srgb, var(--accent) 28%, var(--border));
    border-radius: 17px;
    background: var(--accent-soft);
}

.target-callout span,
.target-callout small {
    display: block;
    color: var(--muted);
    line-height: 1.5;
}

.target-callout span {
    font-size: 12px;
    font-weight: 780;
    text-transform: uppercase;
    letter-spacing: .055em;
}

.target-callout strong {
    display: block;
    margin: 7px 0 9px;
    color: var(--accent-text);
    font-size: 27px;
    letter-spacing: -.025em;
}

.target-callout small {
    font-size: 12px;
}

.meter-label {
    display: block;
    margin-bottom: 9px;
    color: var(--muted-2);
    font-size: 12px;
    font-weight: 750;
}

.meter-track {
    height: 9px;
    overflow: hidden;
    border-radius: 999px;
    background: var(--surface-muted);
}

.meter-track span {
    display: block;
    min-width: 3%;
    height: 100%;
    border-radius: inherit;
    background: linear-gradient(90deg, var(--accent), var(--blue));
}

.target-table-wrap {
    margin-top: 25px;
    overflow-x: auto;
    border: 1px solid var(--border);
    border-radius: 18px;
}

.target-table {
    width: 100%;
    min-width: 670px;
    border-collapse: collapse;
}

.target-table th,
.target-table td {
    padding: 16px 18px;
    text-align: left;
    border-bottom: 1px solid var(--border);
}

.target-table tr:last-child td {
    border-bottom: 0;
}

.target-table th {
    color: var(--muted-2);
    background: var(--surface-muted);
    font-size: 11px;
    letter-spacing: .07em;
    text-transform: uppercase;
}

.target-table td {
    color: var(--muted);
    font-size: 14px;
}

.target-table td strong {
    color: var(--body-color);
}

.target-table tr.is-balanced {
    background: rgba(var(--accent-rgb), .075);
}

.target-table tr.is-limit {
    background: var(--warning-bg);
}

.delta {
    display: inline-flex;
    min-width: 78px;
    justify-content: center;
    padding: 6px 8px;
    border-radius: 999px;
    font-size: 12px;
    font-weight: 820;
}

.delta--up {
    color: var(--blue);
    background: color-mix(in srgb, var(--blue) 10%, transparent);
}

.delta--down {
    color: var(--yellow);
    background: color-mix(in srgb, var(--yellow) 10%, transparent);
}

.delta--same {
    color: var(--accent-text);
    background: var(--accent-soft);
}

.table-note {
    display: flex;
    gap: 12px;
    margin-top: 19px;
    color: var(--muted);
}

.table-note svg {
    flex: 0 0 22px;
    width: 22px;
    height: 22px;
    color: var(--accent-text);
}

.table-note p {
    margin: 0;
    font-size: 13px;
    line-height: 1.65;
}

.reliability-head {
    display: flex;
    justify-content: space-between;
    gap: 22px;
    align-items: flex-start;
}

.reliability-badge {
    flex: 0 0 auto;
    padding: 8px 11px;
    border-radius: 999px;
    font-size: 11px;
    font-weight: 850;
    text-transform: uppercase;
    letter-spacing: .06em;
}

.reliability-badge.is-ok {
    color: var(--green);
    background: color-mix(in srgb, var(--green) 11%, transparent);
}

.reliability-badge.is-warning {
    color: var(--yellow);
    background: color-mix(in srgb, var(--yellow) 11%, transparent);
}

.reliability-copy {
    max-width: 780px;
    margin-top: 22px;
}

.warning-list {
    display: grid;
    gap: 10px;
    margin-top: 22px;
}

.warning-item {
    display: flex;
    gap: 11px;
    padding: 14px 15px;
    border: 1px solid color-mix(in srgb, var(--yellow) 22%, var(--border));
    border-radius: 14px;
    background: color-mix(in srgb, var(--yellow) 6%, transparent);
}

.warning-item > span {
    flex: 0 0 25px;
    width: 25px;
    height: 25px;
    display: grid;
    place-items: center;
    border-radius: 50%;
    background: color-mix(in srgb, var(--yellow) 16%, transparent);
    color: var(--yellow);
    font-weight: 900;
}

.warning-item p {
    margin: 2px 0 0;
    color: var(--muted);
    line-height: 1.6;
}

.technical {
    margin-top: 23px;
    border-top: 1px solid var(--border);
    padding-top: 18px;
}

.technical summary {
    cursor: pointer;
    color: var(--muted);
    font-size: 13px;
    font-weight: 760;
}

.technical-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 10px;
    margin-top: 15px;
}

.technical-grid div {
    padding: 13px;
    border: 1px solid var(--border);
    border-radius: 13px;
    background: var(--surface-muted);
}

.technical-grid span,
.technical-grid strong {
    display: block;
}

.technical-grid span {
    margin-bottom: 4px;
    color: var(--muted-2);
    font-size: 11px;
}

.technical-grid strong {
    font-size: 13px;
    overflow-wrap: anywhere;
}

.source-panel {
    display: grid;
    grid-template-columns: 70px minmax(0, 1fr);
    gap: 25px;
}

.source-mark {
    width: 60px;
    height: 60px;
    display: grid;
    place-items: center;
    border-radius: 18px;
    background: var(--accent-soft);
    color: var(--accent-text);
}

.source-mark svg {
    width: 29px;
    height: 29px;
}

.source-copy p {
    max-width: 850px;
    margin-top: 14px;
}

.source-link {
    width: fit-content;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    margin: 0;
    color: #fff;
    font-weight: 820;
    text-decoration: underline;
}

.source-link:hover {
    text-decoration: underline;
}

.source-link svg {
    width: 19px;
    height: 19px;
}

.footer {
    display: block;
    padding: 0 0 44px;
    color: var(--muted);
    text-align: center;
    font-size: 13px;
}

.footer span {
    color: var(--muted);
    font-weight: 850;
    letter-spacing: .05em;
}

.footer p {
    margin: 0;
}

.footer a {
    text-decoration: underline;
    font-weight: 600;
}

.floating-tools {
    position: fixed;
    right: max(18px, env(safe-area-inset-right));
    bottom: max(18px, env(safe-area-inset-bottom));
    z-index: 1000;
    display: flex;
    flex-direction: column;
    gap: 8px;
    padding: 7px;
    border: 1px solid var(--border);
    border-radius: 18px;
    background: var(--floating-bg);
    box-shadow: var(--shadow-sm);
    backdrop-filter: blur(18px);
    -webkit-backdrop-filter: blur(18px);
}

.floating-tools button {
    width: 40px;
    height: 40px;
    display: grid;
    place-items: center;
    padding: 0;
    border: 0;
    border-radius: 12px;
    background: transparent;
    color: var(--muted);
    cursor: pointer;
}

.floating-tools button:hover {
    background: rgba(var(--accent-rgb), .11);
    color: var(--body-color);
}

.floating-tools svg {
    width: 21px;
    height: 21px;
}

[data-bs-theme="dark"] .icon-moon,
[data-bs-theme="light"] .icon-sun {
    display: none;
}


.inline-button {
    width: fit-content;
    margin: 0 auto;
}

@media (max-width: 820px) {
    .section-head {
        grid-template-columns: 1fr;
        gap: 12px;
        align-items: start;
    }

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

    .result-hero {
        grid-template-columns: 1fr;
    }

    .result-meta {
        grid-template-columns: repeat(3, 1fr);
        grid-template-rows: auto;
    }

    .result-meta div + div {
        border-top: 0;
        border-left: 1px solid var(--border);
    }

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

@media (max-width: 580px) {
    .page-shell {
        width: min(100% - 18px, 1180px);
        padding-top: 8px;
    }

    .tool-header {
        padding-top: 9px;
    }

    .tool-header-card {
        padding: 26px 22px;
        border-radius: 24px;
    }

    .tool-header h1 {
        font-size: clamp(2rem, 11vw, 2.8rem);
    }

    .tool-header p {
        font-size: 15px;
    }

    .panel,
    .result-hero {
        border-radius: 22px;
    }

    .calculator-panel,
    .targets-panel,
    .reliability-panel,
    .source-panel {
        padding: 22px 18px;
    }

    .form-actions {
        align-items: stretch;
        flex-direction: column;
    }

    .primary-button {
        width: 100%;
    }

    .result-meta {
        grid-template-columns: 1fr;
    }

    .result-meta div + div {
        border-left: 0;
        border-top: 1px solid var(--border);
    }

    .co2-reading strong {
        font-size: 72px;
    }

    .co2-scale {
        padding: 15px 13px 13px;
    }

    .co2-scale-legend {
        gap: 7px 11px;
    }

    .co2-marker-label {
        font-size: 10px;
    }

    .reliability-head {
        flex-direction: column;
    }

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

    .source-panel {
        grid-template-columns: 1fr;
    }

    .footer {
        flex-direction: column;
        gap: 6px;
        padding-left: 8px;
    }

    .floating-tools {
        right: 10px;
        bottom: 10px;
    }
}

/* =========================================================
   Error page
   ========================================================= */

.error-page {
    display: grid;
    place-items: center;

    min-height: calc(100vh - 40px);

    padding: 32px 0;
}


.error-card {
    position: relative;

    width: min(100%, 760px);

    overflow: hidden;

    padding: clamp(28px, 6vw, 56px);

    border-radius: 32px;

    background: linear-gradient(
            135deg,
            #173d34 0%,
            #1c6757 100%
    );

    color: #fff;

    box-shadow: var(--shadow-sm);
}


/* тот же декоративный круг,
   что используется в hero */

.error-decoration {
    position: absolute;

    top: -120px;
    right: -120px;

    width: 340px;
    height: 340px;

    border-radius: 50%;

    background: rgba(255, 255, 255, .08);

    pointer-events: none;
}


/* Brand */

.error-brand {
    position: relative;
    z-index: 2;

    display: inline-flex;
}


/* Код ошибки */

.error-code {
    position: relative;
    z-index: 1;

    margin-top: 44px;

    color: rgba(255, 255, 255, .16);

    font-size: clamp(90px, 18vw, 155px);

    font-weight: 900;

    line-height: .78;

    letter-spacing: -.075em;

    user-select: none;
}


/* Заголовок */

.error-card h1 {
    position: relative;
    z-index: 2;

    margin: 30px 0 12px;

    max-width: 620px;

    color: #fff;

    font-size: clamp(30px, 5vw, 44px);

    line-height: 1.08;

    letter-spacing: -.04em;
}


/* Описание */

.error-text {
    position: relative;
    z-index: 2;

    max-width: 590px;

    margin: 0;

    color: rgba(255, 255, 255, .76);

    font-size: 16px;

    line-height: 1.65;
}


/* Кнопка */

.error-action {
    position: relative;
    z-index: 2;

    width: fit-content;

    display: inline-flex;

    align-items: center;

    gap: 10px;

    margin-top: 30px;

    padding: 12px 17px;

    border: 1px solid rgba(255, 255, 255, .18);

    border-radius: 16px;

    background: rgba(255, 255, 255, .12);

    color: #fff;

    font-weight: 750;

    text-decoration: none;

    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);

    transition: background .18s ease,
    transform .18s ease,
    border-color .18s ease;
}


.error-action:hover {
    background: rgba(255, 255, 255, .19);

    border-color: rgba(255, 255, 255, .26);

    transform: translateY(-1px);
}


.error-action svg {
    width: 20px;
    height: 20px;
}


/* Mobile */

@media (max-width: 620px) {

    .error-page {
        min-height: calc(100vh - 20px);

        padding: 10px 0;
    }


    .error-card {
        padding: 26px 22px 32px;

        border-radius: 24px;
    }


    .error-code {
        margin-top: 38px;

        font-size: clamp(88px, 31vw, 130px);
    }


    .error-card h1 {
        margin-top: 26px;
    }


    .error-action {
        width: 100%;

        justify-content: center;
    }
}