/**
 * Material 3 Expressive (MD3E) Design System
 * 遵循 Google Material 3 Expressive 規範：情感化動態、飽滿色彩色調、高幾何圓角與分層表面
 */

:root {
    /* 亮色主題色票 (Light Palette) */
    --md-sys-color-primary: #4355B9;
    --md-sys-color-on-primary: #FFFFFF;
    --md-sys-color-primary-container: #DEE0FF;
    --md-sys-color-on-primary-container: #00105C;
    --md-sys-color-secondary: #00875A;
    --md-sys-color-on-secondary: #FFFFFF;
    --md-sys-color-secondary-container: #A3F3D1;
    --md-sys-color-on-secondary-container: #002114;
    --md-sys-color-tertiary: #B25E00;
    --md-sys-color-tertiary-container: #FFDCC1;
    --md-sys-color-on-tertiary-container: #3B1B00;
    --md-sys-color-error: #BA1A1A;
    --md-sys-color-on-error: #FFFFFF;
    --md-sys-color-error-container: #FFDAD6;
    --md-sys-color-on-error-container: #410002;

    --md-sys-color-surface: #FBF8FF;
    --md-sys-color-on-surface: #1A1B21;
    --md-sys-color-surface-variant: #E3E1EC;
    --md-sys-color-on-surface-variant: #46464F;
    --md-sys-color-outline: #767680;
    --md-sys-color-outline-variant: #C7C5D0;

    /* MD3E 五級表面層次 (Surface Containers) */
    --md-sys-color-surface-container-lowest: #FFFFFF;
    --md-sys-color-surface-container-low: #F5F2FA;
    --md-sys-color-surface-container: #EFECF4;
    --md-sys-color-surface-container-high: #EAE6EE;
    --md-sys-color-surface-container-highest: #E4E1E8;

    /* 圓角造型 Tokens (Expressive Shapes) */
    --md-shape-corner-xs: 4px;
    --md-shape-corner-s: 8px;
    --md-shape-corner-m: 12px;
    --md-shape-corner-l: 16px;
    --md-shape-corner-xl: 28px;
    --md-shape-corner-full: 9999px;

    /* 陰影與景深 (Elevation) */
    --md-sys-elevation-1: 0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.12);
    --md-sys-elevation-2: 0 4px 8px rgba(0,0,0,0.08), 0 2px 4px rgba(0,0,0,0.06);
    --md-sys-elevation-3: 0 8px 24px rgba(67, 85, 185, 0.12), 0 4px 8px rgba(0,0,0,0.06);
    --md-sys-elevation-4: 0 16px 36px rgba(67, 85, 185, 0.16), 0 8px 16px rgba(0,0,0,0.08);

    /* 彈性動效 (Expressive Motion Curves) */
    --md-motion-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
    --md-motion-standard: cubic-bezier(0.2, 0.0, 0, 1.0);
    --md-motion-duration-short: 150ms;
    --md-motion-duration-medium: 300ms;
    --md-motion-duration-long: 500ms;

    --font-family-base: 'Roboto Flex', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --font-family-mono: 'JetBrains Mono', 'Fira Code', Menlo, Monaco, Consolas, monospace;
}

/* 深色主題色票 (Dark Palette) */
[data-theme="dark"] {
    --md-sys-color-primary: #BAC3FF;
    --md-sys-color-on-primary: #08218A;
    --md-sys-color-primary-container: #2A3D9F;
    --md-sys-color-on-primary-container: #DEE0FF;
    --md-sys-color-secondary: #86D7B4;
    --md-sys-color-on-secondary: #003823;
    --md-sys-color-secondary-container: #005135;
    --md-sys-color-on-secondary-container: #A3F3D1;
    --md-sys-color-tertiary: #FFB77A;
    --md-sys-color-tertiary-container: #834300;
    --md-sys-color-on-tertiary-container: #FFDCC1;
    --md-sys-color-error: #FFB4AB;
    --md-sys-color-on-error: #690005;
    --md-sys-color-error-container: #93000A;
    --md-sys-color-on-error-container: #FFDAD6;

    --md-sys-color-surface: #121318;
    --md-sys-color-on-surface: #E4E1E8;
    --md-sys-color-surface-variant: #46464F;
    --md-sys-color-on-surface-variant: #C7C5D0;
    --md-sys-color-outline: #90909A;
    --md-sys-color-outline-variant: #46464F;

    --md-sys-color-surface-container-lowest: #0D0E13;
    --md-sys-color-surface-container-low: #1A1B21;
    --md-sys-color-surface-container: #1E1F25;
    --md-sys-color-surface-container-high: #292A30;
    --md-sys-color-surface-container-highest: #33343B;

    --md-sys-elevation-1: 0 1px 3px rgba(0,0,0,0.3);
    --md-sys-elevation-2: 0 4px 12px rgba(0,0,0,0.4);
    --md-sys-elevation-3: 0 8px 24px rgba(0,0,0,0.5);
    --md-sys-elevation-4: 0 16px 36px rgba(0,0,0,0.6);
}

/* 基礎設定 */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    -webkit-font-smoothing: antialiased;
}

body {
    font-family: var(--font-family-base);
    background-color: var(--md-sys-color-surface);
    color: var(--md-sys-color-on-surface);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    transition: background-color var(--md-motion-duration-medium) var(--md-motion-standard),
                color var(--md-motion-duration-medium) var(--md-motion-standard);
    overflow-x: hidden;
}

/* 頂部頂欄 (Top App Bar) */
.md3e-top-app-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 32px;
    background: var(--md-sys-color-surface-container-low);
    border-bottom: 1px solid var(--md-sys-color-outline-variant);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(12px);
}

.md3e-brand {
    display: flex;
    align-items: center;
    gap: 12px;
}

.md3e-brand .logo-icon {
    font-size: 32px;
    color: var(--md-sys-color-primary);
}

.md3e-brand h1 {
    font-size: 1.35rem;
    font-weight: 700;
    letter-spacing: -0.02em;
}

.md3e-brand .badge {
    background-color: var(--md-sys-color-primary-container);
    color: var(--md-sys-color-on-primary-container);
    font-size: 0.72rem;
    font-weight: 700;
    padding: 4px 10px;
    border-radius: var(--md-shape-corner-full);
    text-transform: uppercase;
}

.md3e-top-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

/* MD3E 下拉選單元件 (MD3E Expressive Dropdown & Menu) */
.md3e-dropdown {
    position: relative;
    display: inline-block;
}

.md3e-btn-dropdown {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    height: 38px;
    padding: 0 12px 0 10px;
    background-color: var(--md-sys-color-surface-container);
    border: 1px solid var(--md-sys-color-outline-variant);
    border-radius: var(--md-shape-corner-full);
    color: var(--md-sys-color-on-surface);
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    font-family: inherit;
    transition: all var(--md-motion-duration-short) var(--md-motion-standard);
    user-select: none;
}

.md3e-btn-dropdown:hover {
    background-color: var(--md-sys-color-surface-container-high);
    border-color: var(--md-sys-color-primary);
}

.md3e-btn-dropdown .material-symbols-rounded {
    font-size: 18px;
    color: var(--md-sys-color-primary);
}

.md3e-btn-dropdown .dropdown-arrow {
    font-size: 20px;
    color: var(--md-sys-color-outline);
    transition: transform var(--md-motion-duration-medium) var(--md-motion-spring);
    margin-left: 2px;
}

.md3e-dropdown.open .dropdown-arrow {
    transform: rotate(180deg);
    color: var(--md-sys-color-primary);
}

.md3e-dropdown.open .md3e-btn-dropdown {
    border-color: var(--md-sys-color-primary);
    box-shadow: 0 0 0 2px rgba(67, 85, 185, 0.2);
    background-color: var(--md-sys-color-surface-container-high);
}

.md3e-menu {
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    min-width: 170px;
    background-color: var(--md-sys-color-surface-container-high);
    border: 1px solid var(--md-sys-color-outline-variant);
    border-radius: var(--md-shape-corner-l);
    box-shadow: var(--md-sys-elevation-3);
    padding: 6px;
    display: flex;
    flex-direction: column;
    gap: 4px;
    z-index: 250;
    backdrop-filter: blur(12px);
    opacity: 0;
    transform: translateY(-8px) scale(0.95);
    pointer-events: none;
    visibility: hidden;
    transition: opacity var(--md-motion-duration-short) var(--md-motion-standard),
                transform var(--md-motion-duration-medium) var(--md-motion-spring),
                visibility 0ms var(--md-motion-duration-short);
    transform-origin: top right;
}

.md3e-dropdown.open .md3e-menu {
    opacity: 1;
    transform: translateY(0) scale(1);
    pointer-events: auto;
    visibility: visible;
    transition: opacity var(--md-motion-duration-short) var(--md-motion-standard),
                transform var(--md-motion-duration-medium) var(--md-motion-spring);
}

.md3e-menu-item {
    display: flex;
    align-items: center;
    gap: 10px;
    width: 100%;
    padding: 8px 12px;
    border: none;
    background: transparent;
    border-radius: var(--md-shape-corner-m);
    color: var(--md-sys-color-on-surface);
    font-size: 0.86rem;
    font-weight: 500;
    font-family: inherit;
    cursor: pointer;
    text-align: left;
    user-select: none;
    transition: all var(--md-motion-duration-short) var(--md-motion-standard);
}

.md3e-menu-item:hover {
    background-color: var(--md-sys-color-surface-container-highest);
    color: var(--md-sys-color-on-surface);
    transform: translateX(2px);
}

.md3e-menu-item .check-icon {
    font-size: 16px;
    opacity: 0;
    transform: scale(0.5);
    transition: all var(--md-motion-duration-short) var(--md-motion-spring);
    color: var(--md-sys-color-primary);
}

.md3e-menu-item.active {
    background-color: var(--md-sys-color-primary-container);
    color: var(--md-sys-color-on-primary-container);
    font-weight: 700;
}

.md3e-menu-item.active .check-icon {
    opacity: 1;
    transform: scale(1);
    color: var(--md-sys-color-on-primary-container);
}

/* 主要容器佈局 */
.md3e-main-container {
    max-width: 1200px;
    width: 100%;
    margin: 0 auto;
    padding: 24px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
    flex: 1;
}

@media (max-width: 900px) {
    .md3e-main-container {
        grid-template-columns: 1fr;
        padding: 16px;
    }
}

/* MD3E 卡片 (Cards) */
.md3e-card {
    background-color: var(--md-sys-color-surface-container);
    border-radius: var(--md-shape-corner-xl);
    padding: 24px;
    display: flex;
    flex-direction: column;
    gap: 20px;
    box-shadow: var(--md-sys-elevation-1);
    transition: transform var(--md-motion-duration-medium) var(--md-motion-spring),
                box-shadow var(--md-motion-duration-medium) var(--md-motion-standard);
    border: 1px solid transparent;
}

.md3e-card:hover {
    box-shadow: var(--md-sys-elevation-2);
}

.md3e-card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.md3e-card-title {
    font-size: 1.15rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 10px;
}

.md3e-card-title .material-symbols-rounded {
    font-size: 24px;
    color: var(--md-sys-color-primary);
}

/* 設備狀態橫幅卡片 */
.device-hero {
    background: linear-gradient(135deg, var(--md-sys-color-surface-container-high) 0%, var(--md-sys-color-surface-container) 100%);
    border: 1px solid var(--md-sys-color-outline-variant);
}

.device-status-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 14px;
    border-radius: var(--md-shape-corner-full);
    font-size: 0.85rem;
    font-weight: 600;
}

.status-disconnected {
    background-color: var(--md-sys-color-surface-container-highest);
    color: var(--md-sys-color-on-surface-variant);
}

.status-connected {
    background-color: var(--md-sys-color-secondary-container);
    color: var(--md-sys-color-on-secondary-container);
}

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

.status-connected .status-dot {
    animation: pulseGlow 1.8s infinite;
}

@keyframes pulseGlow {
    0% { transform: scale(0.9); opacity: 0.7; }
    50% { transform: scale(1.3); opacity: 1; filter: drop-shadow(0 0 4px currentColor); }
    100% { transform: scale(0.9); opacity: 0.7; }
}

/* 晶片規格資訊網格 */
.mcu-info-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
    background-color: var(--md-sys-color-surface-container-low);
    padding: 16px;
    border-radius: var(--md-shape-corner-l);
}

.mcu-info-item {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.mcu-info-label {
    font-size: 0.75rem;
    color: var(--md-sys-color-outline);
    text-transform: uppercase;
    font-weight: 600;
    letter-spacing: 0.05em;
}

.mcu-info-value {
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--md-sys-color-on-surface);
}

/* 檔案上傳拖曳區 (Expressive Dropzone) */
.dropzone {
    border: 2px dashed var(--md-sys-color-outline-variant);
    border-radius: var(--md-shape-corner-xl);
    padding: 28px 16px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 12px;
    cursor: pointer;
    background-color: var(--md-sys-color-surface-container-lowest);
    transition: all var(--md-motion-duration-medium) var(--md-motion-spring);
    text-align: center;
}

.dropzone:hover, .dropzone.dragover {
    border-color: var(--md-sys-color-primary);
    background-color: var(--md-sys-color-primary-container);
    transform: scale(1.02);
}

.dropzone .drop-icon {
    font-size: 48px;
    color: var(--md-sys-color-primary);
    transition: transform var(--md-motion-duration-medium) var(--md-motion-spring);
}

.dropzone:hover .drop-icon {
    transform: translateY(-4px);
}

.dropzone-text {
    font-size: 0.95rem;
    font-weight: 600;
}

.dropzone-subtext {
    font-size: 0.8rem;
    color: var(--md-sys-color-outline);
}

.file-info-chip {
    display: none;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    background-color: var(--md-sys-color-primary-container);
    color: var(--md-sys-color-on-primary-container);
    border-radius: var(--md-shape-corner-full);
    font-weight: 600;
    font-size: 0.88rem;
}

/* 表單輸入框與開關 (Form Controls) */
.form-field {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.form-label {
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--md-sys-color-on-surface-variant);
}

.md3e-input {
    background-color: var(--md-sys-color-surface-container-highest);
    border: 1px solid var(--md-sys-color-outline-variant);
    color: var(--md-sys-color-on-surface);
    font-family: var(--font-family-mono);
    font-size: 0.92rem;
    padding: 12px 16px;
    border-radius: var(--md-shape-corner-m);
    outline: none;
    transition: all var(--md-motion-duration-short) var(--md-motion-standard);
}

.md3e-input:focus {
    border-color: var(--md-sys-color-primary);
    box-shadow: 0 0 0 3px rgba(67, 85, 185, 0.2);
}

/* 核取方塊群組 */
.checkbox-group {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
}

.md3e-checkbox-label {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    user-select: none;
}

.md3e-checkbox-label input[type="checkbox"] {
    appearance: none;
    width: 20px;
    height: 20px;
    border: 2px solid var(--md-sys-color-outline);
    border-radius: var(--md-shape-corner-xs);
    display: grid;
    place-content: center;
    cursor: pointer;
    transition: all var(--md-motion-duration-short) var(--md-motion-standard);
}

.md3e-checkbox-label input[type="checkbox"]:checked {
    background-color: var(--md-sys-color-primary);
    border-color: var(--md-sys-color-primary);
}

.md3e-checkbox-label input[type="checkbox"]::before {
    content: "\2713";
    color: var(--md-sys-color-on-primary);
    font-size: 14px;
    font-weight: bold;
    transform: scale(0);
    transition: transform var(--md-motion-duration-short) var(--md-motion-spring);
}

.md3e-checkbox-label input[type="checkbox"]:checked::before {
    transform: scale(1);
}

/* MD3E 按鈕系統 (Buttons) */
.md3e-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 24px;
    border-radius: var(--md-shape-corner-full);
    font-size: 0.95rem;
    font-weight: 600;
    border: none;
    cursor: pointer;
    user-select: none;
    transition: all var(--md-motion-duration-medium) var(--md-motion-spring);
    position: relative;
    overflow: hidden;
}

.md3e-btn:active {
    transform: scale(0.96);
}

.md3e-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none !important;
}

.btn-filled {
    background-color: var(--md-sys-color-primary);
    color: var(--md-sys-color-on-primary);
    box-shadow: var(--md-sys-elevation-1);
}

.btn-filled:hover:not(:disabled) {
    box-shadow: var(--md-sys-elevation-2);
    transform: translateY(-2px);
}

.btn-tonal {
    background-color: var(--md-sys-color-primary-container);
    color: var(--md-sys-color-on-primary-container);
}

.btn-tonal:hover:not(:disabled) {
    background-color: #cbceff;
    transform: translateY(-2px);
}

.btn-secondary {
    background-color: var(--md-sys-color-secondary-container);
    color: var(--md-sys-color-on-secondary-container);
}

.btn-secondary:hover:not(:disabled) {
    transform: translateY(-2px);
}

.btn-outlined {
    background-color: transparent;
    border: 1px solid var(--md-sys-color-outline);
    color: var(--md-sys-color-primary);
}

.btn-outlined:hover:not(:disabled) {
    background-color: var(--md-sys-color-surface-container-highest);
}

.btn-error {
    background-color: var(--md-sys-color-error-container);
    color: var(--md-sys-color-on-error-container);
}

.btn-icon {
    padding: 10px;
    border-radius: 50%;
    background-color: transparent;
    color: var(--md-sys-color-on-surface);
    border: none;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: background-color var(--md-motion-duration-short) var(--md-motion-standard);
}

.btn-icon:hover {
    background-color: var(--md-sys-color-surface-container-highest);
}

/* 進度條與狀態 (Progress Capsule) */
.progress-card {
    background: var(--md-sys-color-surface-container-lowest);
    border-radius: var(--md-shape-corner-l);
    padding: 16px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.progress-header {
    display: flex;
    justify-content: space-between;
    font-size: 0.85rem;
    font-weight: 600;
}

.progress-capsule-bar {
    height: 12px;
    background-color: var(--md-sys-color-surface-container-highest);
    border-radius: var(--md-shape-corner-full);
    overflow: hidden;
    position: relative;
}

.progress-fill {
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, var(--md-sys-color-primary), #6E85FF);
    border-radius: var(--md-shape-corner-full);
    transition: width var(--md-motion-duration-medium) var(--md-motion-standard);
}

.progress-subtext {
    font-size: 0.78rem;
    color: var(--md-sys-color-outline);
    display: flex;
    justify-content: space-between;
}

/* 即時日誌視窗 (Expressive Terminal) */
.log-terminal {
    background-color: #0c0d12;
    color: #e2e8f0;
    font-family: var(--font-family-mono);
    font-size: 0.82rem;
    border-radius: var(--md-shape-corner-xl);
    padding: 16px;
    height: 280px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 4px;
    box-shadow: inset 0 2px 6px rgba(0,0,0,0.5);
    border: 1px solid rgba(255,255,255,0.08);
}

.log-entry {
    line-height: 1.45;
    word-break: break-all;
    display: flex;
    gap: 8px;
}

.log-time {
    color: #64748b;
    user-select: none;
    flex-shrink: 0;
}

.log-info { color: #93c5fd; }
.log-success { color: #86efac; font-weight: 600; }
.log-warn { color: #fde047; }
.log-error { color: #fca5a5; font-weight: 600; }

/* 對話框視窗 (Expressive Modal) */
.md3e-modal-backdrop {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(0, 0, 0, 0.45);
    backdrop-filter: blur(8px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--md-motion-duration-medium) var(--md-motion-standard);
}

.md3e-modal-backdrop.open {
    opacity: 1;
    pointer-events: auto;
}

.md3e-modal-dialog {
    background-color: var(--md-sys-color-surface-container-high);
    border-radius: var(--md-shape-corner-xl);
    max-width: 580px;
    width: 90%;
    padding: 28px;
    box-shadow: var(--md-sys-elevation-4);
    display: flex;
    flex-direction: column;
    gap: 20px;
    transform: scale(0.9);
    transition: transform var(--md-motion-duration-medium) var(--md-motion-spring);
    max-height: 85vh;
    overflow-y: auto;
}

.md3e-modal-backdrop.open .md3e-modal-dialog {
    transform: scale(1);
}

.md3e-modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.md3e-modal-title {
    font-size: 1.25rem;
    font-weight: 700;
}

.md3e-modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: 12px;
    margin-top: 8px;
}

/* 頁尾 (Footer) */
.md3e-footer {
    text-align: center;
    padding: 20px;
    font-size: 0.8rem;
    color: var(--md-sys-color-outline);
    border-top: 1px solid var(--md-sys-color-outline-variant);
    margin-top: auto;
}

/* 前置步驟指南 (Setup Guide Modal & Tabs) */
.guide-tabs {
    display: flex;
    gap: 8px;
    background-color: var(--md-sys-color-surface-container-highest);
    padding: 4px;
    border-radius: var(--md-shape-corner-full);
    margin-bottom: 8px;
}

.guide-tab-btn {
    flex: 1;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 8px 12px;
    border-radius: var(--md-shape-corner-full);
    border: none;
    background: transparent;
    color: var(--md-sys-color-on-surface-variant);
    font-size: 0.88rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--md-motion-duration-short) var(--md-motion-standard);
}

.guide-tab-btn.active {
    background-color: var(--md-sys-color-surface-container-lowest);
    color: var(--md-sys-color-primary);
    box-shadow: var(--md-sys-elevation-1);
}

.guide-tab-content {
    display: none;
    flex-direction: column;
    gap: 14px;
    animation: fadeIn 0.25s ease-out;
}

.guide-tab-content.active {
    display: flex;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(4px); }
    to { opacity: 1; transform: translateY(0); }
}

.step-card {
    background: var(--md-sys-color-surface-container-low);
    border-radius: var(--md-shape-corner-m);
    padding: 14px 16px;
    display: flex;
    flex-direction: column;
    gap: 8px;
    border: 1px solid var(--md-sys-color-outline-variant);
}

.step-header {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 700;
    font-size: 0.92rem;
    color: var(--md-sys-color-on-surface);
}

.step-number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background-color: var(--md-sys-color-primary-container);
    color: var(--md-sys-color-on-primary-container);
    font-size: 0.75rem;
    font-weight: 700;
    flex-shrink: 0;
}

.step-body {
    font-size: 0.85rem;
    color: var(--md-sys-color-on-surface-variant);
    line-height: 1.5;
}

.code-box {
    position: relative;
    background-color: #0c0d12;
    color: #cbd5e1;
    padding: 12px 14px;
    border-radius: var(--md-shape-corner-s);
    font-family: var(--font-family-mono);
    font-size: 0.8rem;
    line-height: 1.45;
    border: 1px solid rgba(255, 255, 255, 0.1);
    overflow-x: auto;
}

.code-box .copy-code-btn {
    position: absolute;
    top: 6px;
    right: 6px;
    padding: 4px 10px;
    font-size: 0.72rem;
    font-weight: 600;
    background: rgba(255, 255, 255, 0.15);
    color: #fff;
    border: none;
    border-radius: var(--md-shape-corner-full);
    cursor: pointer;
    transition: background 0.2s;
}

.code-box .copy-code-btn:hover {
    background: rgba(255, 255, 255, 0.3);
}

.link-btn {
    color: var(--md-sys-color-primary);
    text-decoration: underline;
    font-weight: 600;
    cursor: pointer;
}