:root {
    --space-xxs: 2px;
    --space-xs: 4px;
    --space-sm: 6px;
    --space-md: 8px;
    --space-lg: 10px;
    --space-xl: 12px;
    --space-2xl: 16px;
    --space-3xl: 20px;
    --space-4xl: 30px;
    --space-5xl: 40px;

    --color-white: #fff;
    --color-white-upper: #FFF;
    --color-black: #000;
    --color-gray-100: #f7fbff;
    --color-gray-200: #f5f5f5;
    --color-gray-300: #eee;
    --color-gray-500: #718096;
    --color-gray-600: #666;
    --color-gray-700: #4a5568;
    --color-gray-800: #333;
    --color-red-500: #ef3f3f;
    --color-red-700: #c60c30;
    --color-red-alert: red;
    --color-blue-700: #1e3a8a;
    --color-slate-700: #2d3748;
    --color-border-soft: #e2e8f0;
    --color-border-accent: rgba(43, 108, 176, 0.12);
    --color-shadow-accent: rgba(20, 46, 78, 0.06);
    --color-success-bg: #d1fae5;
    --color-success-text: #065f46;
    --color-warn-bg: #fef3c7;
    --color-warn-text: #92400e;
    --color-slider-on: #060;
}

body {
    font-family: Arial, sans-serif;
    margin: var(--space-5xl);
}

.content-layout {
    display: flex;
    flex-wrap: wrap;
    align-items: flex-start;
    gap: var(--space-4xl);
}

.content-main {
    flex: 1 1 400px;
    min-width: 300;
}

label {
    display: block;
    margin-top: 15px;
}

input,
select {
    width: 100%;
    padding: var(--space-md);
    margin-top: 5px;
}

input:read-only {
    background-color: var(--color-gray-300);
    /* border: 0; */
}

#result_container, #spiral_cable_container {
    margin-top: var(--space-3xl); /* space above the result block */
    padding-top: var(--space-sm); /* optional inner spacing */
}

#result, #spiral_cable_result, #wire_rope_articleno, #spiral_cable_articleno {
    /* width: 400px; */
    margin-top: var(--space-3xl);
    margin-bottom: var(--space-3xl);
    font-weight: bold;
    font-size: 1.2em;
}

#comment_container {
    margin-top: var(--space-xl); /* space above the result block */
    padding-top: var(--space-sm); /* optional inner spacing */
}

#comment {
    /* width: 400px; */
    margin-top: var(--space-4xl);
    margin-bottom: var(--space-3xl);
    font-weight: bold;
    font-size: 2.0em;
    color: var(--color-red-alert);
}

#sketch_container {
    flex: 1 1 800px;
    margin-top: 0;
    text-align: center;
}

#sketch_container img {
    width: 100%;
    height: auto;
}

.app-footer {
    margin-top: var(--space-5xl);
    padding-top: var(--space-lg);
    border-top: 1px solid var(--color-border-soft);
    font-size: 0.8rem;
    color: var(--color-gray-500);
    text-align: center;
    a {
        color: var(--color-gray-500);
        text-decoration: none;
    }
}

.short-formula {
    font-weight: bold;
}

/* Button container for better spacing */
.toggle-container {
    margin-bottom: var(--space-3xl);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-xl);
}

/* left and right groups */
.toggle-left,
.toggle-right {
    display: flex;
    align-items: center;
    gap: var(--space-lg);
}

/* Style for the toggle buttons */
#btn-qla,
#btn-qlr,
#btn-io {
    padding: var(--space-lg) var(--space-3xl);
    font-size: 16px;
    border: 2px solid var(--color-black);
    background-color: var(--color-white);
    color: var(--color-black);
    cursor: pointer;
    transition: all 0.3s ease;
    width: 100px;
    margin-right: var(--space-lg);
}

/* Dropdown */
.dropdown {
    position: relative;
    display: inline-block;
}

.dropdown-menu {
    display: none;
    position: absolute;
    right: 0;
    top: calc(100% + 2px);
    background-color: var(--color-white);
    border: 2px solid var(--color-black);
    min-width: 150px;
    z-index: 100;
    flex-direction: column;
}

.dropdown-menu.open {
    display: flex;
}

.dropdown-menu button {
    padding: var(--space-lg) var(--space-2xl);
    font-size: 15px;
    border: none;
    border-bottom: 1px solid var(--color-border-soft);
    background-color: var(--color-white);
    color: var(--color-black);
    cursor: pointer;
    text-align: left;
    width: 100%;
    margin: 0;
}

.dropdown-menu button:last-child {
    border-bottom: none;
}

.dropdown-menu button:hover {
    background-color: var(--color-gray-200);
}

.dropdown-divider {
    margin: 0;
    border: none;
    border-top: 1px solid var(--color-border-soft);
}

/* Hover effect */
#btn-qla:hover,
#btn-qlr:hover,
#btn-io:hover {
    background-color: var(--color-red-500);
}

/* Active state */
#btn-qla.active,
#btn-qlr.active {
    background-color: var(--color-red-700);
    color: var(--color-white);
}

/* Info icon styles */
.info-icon {
    display: inline-block;
    width: 16px;
    height: 16px;
    background-color: var(--color-gray-600);
    color: var(--color-white);
    border-radius: 50%;
    text-align: center;
    line-height: 16px;
    font-size: 12px;
    margin-left: 5px;
    cursor: help;
    position: relative;
}

.info-icon:hover::after {
    content: attr(data-tooltip);
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    bottom: 100%;
    width: 200px;
    padding: var(--space-md);
    border-radius: 4px;
    background-color: var(--color-gray-800);
    color: var(--color-white);
    font-size: 12px;
    line-height: 1.4;
    z-index: 100;
}

/* result highlight styling - make results the visual focus */
.result-card {
    padding: var(--space-2xl) var(--space-3xl);
    margin-top: 14px;
    border-radius: 10px;
    background: linear-gradient(180deg, var(--color-white) 0%, var(--color-gray-100) 100%);
    border: 1px solid var(--color-border-accent);
    box-shadow: 0 6px 18px var(--color-shadow-accent);
}

.result-heading {
    margin: 0 0 var(--space-xl) 0;
    font-size: 1.1rem;
    color: var(--color-slate-700);
    font-weight: 600;
    padding-bottom: var(--space-md);
    border-bottom: 1px solid var(--color-border-accent);
}

.result-stack {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

/* Responsive layout */
@media (max-width: 520px) {
    .result-card {
        flex-direction: column;
        gap: var(--space-xl);
    }

    .result-stack {
        align-items: flex-start;
    }

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

@media (max-width: 1100px) {
    #sketch_container {
        margin-top: var(--space-4xl);
    }
}

.advanced-field {
    display: none; /* hidden by default */
    margin-top: var(--space-lg);
}

.toggle_advanced {
  position: relative;
  display: inline-block;
  width: 48px;
  height: 28px;
}

.toggle_advanced input {
  display: none;
}

.slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
    background-color: var(--color-gray-800);
  transition: 0.3s;
  border-radius: 22px;
}

.slider:before {
  position: absolute;
  content: "";
  height: 20px;
  width: 20px;
  left: 4px;
  bottom: 4px;
    background-color: var(--color-white-upper);
  transition: 0.4s;
  border-radius: 50%;
}

input:checked + .slider {
    background-color: var(--color-slider-on);
}

input:checked + .slider:before {
  transform: translateX(20px);
}

.result-pair {
    display: grid;
    grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.2fr);
    gap: var(--space-2xl);
    align-items: flex-start;
}

.result-item {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.result-label {
    color: var(--color-gray-700);
    font-size: 0.9rem;
    font-weight: 500;
}

.result-display {
    display: grid;
    grid-template-columns: max-content minmax(0, 1fr);
    align-items: baseline;
    column-gap: var(--space-xs);
}

.result-display > * {
    min-width: 0;
}

.result-value, .article-no {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--color-blue-700);
}

.article-no {
    white-space: nowrap;
    flex-shrink: 0;
}

.result-unit {
    font-size: 0.9rem;
    color: var(--color-gray-700);
}

.status {
    font-size: 0.8rem;
    padding: var(--space-xxs) var(--space-sm);
    border-radius: 4px;
    font-weight: 600;
    margin-left: var(--space-xs);
    white-space: normal;
}

.status.default {
    background: var(--color-success-bg);
    color: var(--color-success-text);
}

.status.alternative {
    background: var(--color-warn-bg);
    color: var(--color-warn-text);
}