:root {
    --bg-color: #0a0a0c;
    --card-bg: rgba(255, 255, 255, 0.05);
    --card-border: rgba(255, 255, 255, 0.1);
    --text-primary: #ffffff;
    --text-secondary: #a0a0b0;
    --accent-color: #8b5cf6;
    --accent-hover: #a78bfa;
    --accent-glow: rgba(139, 92, 246, 0.3);
    --success-color: #10b981;
    --error-color: #ef4444;
    --disconnected-color: #6b7280;
    --input-bg: rgba(0, 0, 0, 0.3);
    --radius: 12px;
}

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

html,
body {
    height: 100%;
    overflow: hidden;
}

body {
    background-color: var(--bg-color);
    color: var(--text-primary);
    font-family: 'Inter', sans-serif;
    line-height: 1.5;
    min-height: 100dvh;
    height: 100dvh;
    display: flex;
    justify-content: center;
    padding: 1rem;
    overflow: hidden;
}

/* Banner */
.banner {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: var(--error-color);
    color: white;
    padding: 0.75rem;
    text-align: center;
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    font-weight: 600;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.5);
}

.banner.hidden {
    display: none;
}

.app-container {
    width: 100%;
    max-width: 1400px;
    min-height: 0;
    height: 100%;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

/* Header */
header {
    display: flex;
    align-items: center;
}

.header-copy {
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.logo-icon {
    font-size: 2rem;
}

.logo h1 {
    font-size: 1.5rem;
    font-weight: 800;
    letter-spacing: -0.02em;
}

.logo h1 span {
    color: var(--accent-color);
    font-weight: 300;
}

.seo-intro {
    color: var(--text-secondary);
    font-size: 0.92rem;
    max-width: 70ch;
}

.status-badge {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
}

.status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
}

.status-badge.disconnected .status-dot {
    background-color: var(--disconnected-color);
}

.status-badge.connected .status-dot {
    background-color: var(--success-color);
    box-shadow: 0 0 8px var(--success-color);
}

.inline-status {
    width: 100%;
    justify-content: center;
    margin-top: 1rem;
}

/* Main Layout */
main {
    display: grid;
    grid-template-columns: minmax(340px, 400px) minmax(0, 1fr);
    gap: 1rem;
    flex: 1;
    min-height: 0;
    overflow: hidden;
}

@media (max-width: 1000px) {
    html,
    body {
        height: auto;
        overflow: auto;
    }

    body {
        min-height: 100dvh;
        overflow: auto;
    }

    .app-container {
        height: auto;
    }

    main {
        grid-template-columns: 1fr;
        grid-template-rows: auto minmax(0, 1fr);
        overflow: visible;
    }
}

.controls-panel {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    min-height: 0;
}

/* Cards */
.glass-card {
    background: var(--card-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--card-border);
    border-radius: var(--radius);
    padding: 1.5rem;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
}

.preview-panel,
.main-controls,
.settings-card,
.preview-card {
    min-height: 0;
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

h2 {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text-primary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* Form Elements */
.control-group {
    margin-bottom: 1.5rem;
}

label {
    display: block;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

input[type="number"],
input[type="text"] {
    width: 100%;
    background: var(--input-bg);
    border: 1px solid var(--card-border);
    border-radius: 8px;
    padding: 0.75rem;
    color: white;
    font-family: 'JetBrains Mono', monospace;
    font-size: 1rem;
    transition: all 0.2s;
}

input:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 2px var(--accent-glow);
}

.input-with-toggle {
    display: flex;
    gap: 0.5rem;
}

.toggle-group {
    display: flex;
    background: var(--input-bg);
    border: 1px solid var(--card-border);
    border-radius: 8px;
    padding: 3px;
}

.toggle-group button {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    padding: 0.5rem 0.75rem;
    border-radius: 6px;
    font-size: 0.75rem;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.2s;
}

.toggle-group button.active {
    background: var(--accent-color);
    color: white;
}

/* Checkbox */
.checkbox-container {
    display: flex;
    align-items: center;
    position: relative;
    padding-left: 30px;
    cursor: pointer;
    font-size: 0.9rem;
    user-select: none;
}

.checkbox-container input {
    position: absolute;
    opacity: 0;
    cursor: pointer;
    height: 0;
    width: 0;
}

.checkmark {
    position: absolute;
    top: 0;
    left: 0;
    height: 20px;
    width: 20px;
    background-color: var(--input-bg);
    border: 1px solid var(--card-border);
    border-radius: 4px;
}

.checkbox-container:hover input~.checkmark {
    background-color: rgba(255, 255, 255, 0.1);
}

.checkbox-container input:checked~.checkmark {
    background-color: var(--accent-color);
}

.checkmark:after {
    content: "";
    position: absolute;
    display: none;
}

.checkbox-container input:checked~.checkmark:after {
    display: block;
}

.checkbox-container .checkmark:after {
    left: 7px;
    top: 3px;
    width: 5px;
    height: 10px;
    border: solid white;
    border-width: 0 2px 2px 0;
    transform: rotate(45deg);
}

/* Buttons */
.btn {
    padding: 0.8rem 1.5rem;
    border-radius: 8px;
    font-weight: 700;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.2s;
    border: none;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.btn.primary {
    background: var(--accent-color);
    color: white;
    box-shadow: 0 4px 15px var(--accent-glow);
}

.btn.primary:hover:not(:disabled) {
    background: var(--accent-hover);
    transform: translateY(-1px);
}

.btn.primary:active:not(:disabled) {
    transform: translateY(0);
}

.btn.primary:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.btn.secondary {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--card-border);
    color: white;
}

.btn.secondary:hover {
    background: rgba(255, 255, 255, 0.1);
}

.btn.text-btn {
    background: transparent;
    color: var(--accent-color);
    padding: 0.2rem 0.5rem;
    font-size: 0.8rem;
}

.btn.full-width {
    width: 100%;
}

.action-buttons {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin-top: 1rem;
}

/* Settings Grid */
.settings-grid {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.setting-item label {
    margin-bottom: 0.25rem;
}

.input-group {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.icon-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-size: 1.2rem;
    cursor: pointer;
    transition: color 0.2s;
}

.icon-btn:hover {
    color: var(--text-primary);
}

/* Preview Panel */
.preview-card {
    height: 100%;
    display: flex;
    flex-direction: column;
}

.preview-controls {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    flex-wrap: wrap;
    gap: 0.75rem 1.25rem;
}

.checkbox-container.mini {
    padding-left: 24px;
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--text-secondary);
    margin-bottom: 0;
}

.checkbox-container.mini .checkmark {
    height: 16px;
    width: 16px;
}

.checkbox-container.mini .checkmark:after {
    left: 5px;
    top: 2px;
    width: 4px;
    height: 8px;
}

.preview-stats {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.separator {
    opacity: 0.3;
}

.canvas-container {
    flex: 1;
    min-height: 0;
    background: #000;
    border-radius: 8px;
    overflow: hidden;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem;
    border: 1px solid var(--card-border);
}

#ruler-preview {
    display: block;
    flex: none;
    background-color: white;
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.5);
    transform-origin: top center;
    max-width: none;
    max-height: none;
}

.canvas-container[data-scroll-x="enabled"] {
    overflow-x: auto;
    justify-content: flex-start;
}

.canvas-container[data-scroll-y="enabled"] {
    overflow-y: auto;
    align-items: flex-start;
}

footer {
    font-size: 0.8rem;
    color: var(--text-secondary);
    text-align: right;
    opacity: 0.9;
}

@media (max-width: 700px) {
    body {
        padding: 0.75rem;
    }

    .card-header {
        gap: 0.75rem;
        align-items: flex-start;
        flex-wrap: wrap;
    }

    .action-buttons,
    .choice-grid {
        grid-template-columns: 1fr;
    }

    .preview-controls,
    footer {
        justify-content: flex-start;
        text-align: left;
    }
}

.overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
    color: var(--text-secondary);
    font-size: 0.9rem;
    z-index: 10;
}

.hidden {
    display: none !important;
}

/* Modal */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 100;
    padding: 1rem;
}

.modal.active {
    display: flex;
}

.modal-content {
    width: 100%;
    max-width: 500px;
    position: relative;
    padding: 2rem;
}

.close-modal {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-size: 1.5rem;
    cursor: pointer;
}

.modal-body h3 {
    font-size: 1rem;
    margin-bottom: 0.5rem;
    color: var(--accent-color);
}

.modal-body p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

.choice-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
}

.choice-btn {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--card-border);
    color: white;
    padding: 1rem;
    border-radius: 8px;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.2s;
}

.choice-btn:hover {
    border-color: var(--accent-color);
    background: var(--accent-glow);
}

.result-box {
    background: rgba(0, 0, 0, 0.4);
    border-radius: 8px;
    padding: 1rem;
    margin: 1.5rem 0;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.result-row {
    display: flex;
    justify-content: space-between;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.result-row span:last-child {
    font-family: 'JetBrains Mono', monospace;
    color: var(--text-primary);
}

.result-row.highlight {
    color: var(--text-primary);
    font-weight: 700;
}

.result-row.highlight span:last-child {
    color: var(--success-color);
    font-size: 1.1rem;
}

.unit-hints {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    margin-top: 0.5rem;
    font-size: 0.75rem;
    color: var(--text-secondary);
    opacity: 0.7;
}

/* Footer */
footer {
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.8rem;
    opacity: 0.5;
    padding-bottom: 2rem;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
    margin-top: 0.6rem;
}

.footer-links a,
.guide-home-link,
.guide-card a {
    color: var(--accent-hover);
    text-decoration: none;
}

.footer-links a:hover,
.guide-home-link:hover,
.guide-card a:hover {
    text-decoration: underline;
}

.guide-body {
    overflow: auto;
    justify-content: flex-start;
}

.guide-shell {
    width: 100%;
    max-width: 980px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
    padding-bottom: 3rem;
}

.guide-header {
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
}

.guide-header h1 {
    font-size: clamp(2rem, 3vw, 3rem);
    line-height: 1.05;
}

.guide-lead {
    max-width: 70ch;
    color: var(--text-secondary);
    font-size: 1rem;
}

.guide-content {
    display: grid;
    gap: 1rem;
}

.guide-card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 8px;
    padding: 1.4rem;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.28);
}

.guide-card h2 {
    margin-bottom: 0.8rem;
    text-transform: none;
    letter-spacing: 0;
    font-size: 1.1rem;
}

.guide-card p + p {
    margin-top: 0.8rem;
}

.guide-list {
    padding-left: 1.15rem;
    color: var(--text-secondary);
}

.guide-list li + li {
    margin-top: 0.55rem;
}