@layer reset, base, components, utilities;

@layer reset {
    * {
        margin: 0;
        padding: 0;
        box-sizing: border-box;
        -webkit-tap-highlight-color: transparent;
    }

    button, input, select, textarea {
        all: unset;
    }
}

@layer base {
    :root {
        --ios-background: #FFFFFF;
        --ios-secondary-background: #F2F2F7;
        --ios-tertiary-background: #E5E5EA;
        --ios-label: #000000;
        --ios-secondary-label: #3C3C4399;
        --ios-tertiary-label: #3C3C434D;
        --ios-quaternary-label: #3C3C432E;
        --ios-separator: #C6C6C8;
        --ios-tint: #007AFF;
        --ios-tint-pressed: #005BBF;
        --ios-green: #34C759;
        --ios-red: #FF3B30;
        --ios-yellow: #FFCC00;
        --ios-gray: #8E8E93;
        --ios-gray3: #C7C7CC;
        --ios-gray4: #D1D1D6;
        --switch-off: var(--ios-gray4);
        --switch-knob: #FFFFFF;

        --bg-color: var(--ios-background);
        --container-bg: var(--ios-secondary-background);
        --text-color: var(--ios-label);
        --border-color: var(--ios-separator);
        --secondary-color: var(--ios-secondary-label);
        --input-bg: var(--ios-tertiary-background);
        --primary-color: var(--ios-tint);
        --primary-hover: var(--ios-tint-pressed);
        --success-color: var(--ios-green);
        --error-color: var(--ios-red);
        --warning-color: var(--ios-yellow);
        --focus-color: rgba(0, 122, 255, 0.3);
        --focus-shadow: 0 0 0 4px rgba(0, 122, 255, 0.3);

        --vertical-spacing: 16px;
        --border-radius-lg: 20px;
        --border-radius-md: 14px;
        --border-radius-sm: 10px;
        --transition-default: 0.2s ease;
        --transition-theme: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease;
        --blur-amount: 20px;
        --blur-saturate: 180%;

        --surface-mix: color-mix(in srgb, var(--container-bg) 70%, transparent);
        --border-mix: color-mix(in srgb, var(--border-color) 50%, transparent);
        
        --notification-z-index: 1000;
    }

    [data-theme="dark"] {
        --ios-background: #000000;
        --ios-secondary-background: #1C1C1E;
        --ios-tertiary-background: #2C2C2E;
        --ios-label: #FFFFFF;
        --ios-secondary-label: #EBEBF599;
        --ios-tertiary-label: #EBEBF54D;
        --ios-quaternary-label: #EBEBF52E;
        --ios-separator: #38383A;
        --ios-tint: #0A84FF;
        --ios-tint-pressed: #0071E3;
        --ios-green: #32D74B;
        --ios-red: #FF453A;
        --ios-yellow: #FFD60A;
        --ios-gray: #8E8E93;
        --ios-gray3: #48484A;
        --ios-gray4: #3A3A3C;
        --switch-off: var(--ios-gray4);
        --switch-knob: #FFFFFF;
    }

    @media (prefers-contrast: more) {
        :root {
            --border-color: #000000;
            --secondary-color: #000000;
        }
        [data-theme="dark"] {
            --border-color: #FFFFFF;
            --secondary-color: #FFFFFF;
        }
    }

    @media (prefers-reduced-motion: reduce) {
        * {
            animation-duration: 0.01ms !important;
            animation-iteration-count: 1 !important;
            transition-duration: 0.01ms !important;
            scroll-behavior: auto !important;
        }
    }

    body {
        font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
        min-height: 100vh;
        background-color: var(--bg-color);
        color: var(--text-color);
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: flex-start;
        padding: 20px;
        padding-top: max(20px, env(safe-area-inset-top));
        padding-bottom: max(20px, env(safe-area-inset-bottom));
        padding-left: max(20px, env(safe-area-inset-left));
        padding-right: max(20px, env(safe-area-inset-right));
        line-height: 1.5;
        -webkit-font-smoothing: antialiased;
        -moz-osx-font-smoothing: grayscale;
        color-scheme: light dark;
        overflow-y: auto;
        -webkit-overflow-scrolling: touch;
        transition: var(--transition-theme);
    }

    body.modal-open {
        overflow: hidden;
    }

    .visually-hidden {
        position: absolute;
        width: 1px;
        height: 1px;
        padding: 0;
        margin: -1px;
        overflow: hidden;
        clip: rect(0, 0, 0, 0);
        white-space: nowrap;
        border: 0;
    }
}

@layer components {
    .container, .section-container, footer {
        background-color: var(--surface-mix);
        backdrop-filter: blur(var(--blur-amount)) saturate(var(--blur-saturate));
        -webkit-backdrop-filter: blur(var(--blur-amount)) saturate(var(--blur-saturate));
        border: 1px solid var(--border-mix);
        transition: var(--transition-theme);
        isolation: isolate;
    }

    .container {
        padding: clamp(16px, 4vw, 24px);
        border-radius: var(--border-radius-lg);
        width: 100%;
        max-width: 500px;
        box-shadow: 0 8px 20px rgba(0, 0, 0, 0.04), 0 2px 6px rgba(0, 0, 0, 0.02);
        margin: 0 auto;
        position: relative;
    }

    .header-row {
        display: flex;
        justify-content: space-between;
        align-items: center;
        margin-bottom: 12px;
        gap: 16px;
    }

    .header-row h1 {
        font-size: clamp(1.75rem, 5vw, 2.2rem);
        font-weight: 700;
        color: var(--text-color);
        line-height: 1.1;
        flex: 1;
        min-width: 0;
        letter-spacing: -0.02em;
        text-wrap: balance;
    }

    .notification-area {
        position: relative;
        min-height: 3rem;
        margin-bottom: var(--vertical-spacing);
    }

    .subtitle {
        color: var(--secondary-color);
        font-size: clamp(0.9rem, 3vw, 1rem);
        line-height: 1.4;
        text-align: left;
        width: 100%;
        transition: opacity var(--transition-default);
        margin: 0;
    }

    .subtitle.hidden {
        opacity: 0;
        pointer-events: none;
    }

    .notification-container {
        position: fixed;
        top: max(20px, env(safe-area-inset-top));
        right: max(20px, env(safe-area-inset-right));
        z-index: var(--notification-z-index);
        display: flex;
        flex-direction: column;
        gap: 8px;
        width: min(360px, calc(100vw - 40px));
        pointer-events: none;
    }

    .notification {
        background-color: var(--surface-mix);
        backdrop-filter: blur(var(--blur-amount)) saturate(var(--blur-saturate));
        -webkit-backdrop-filter: blur(var(--blur-amount)) saturate(var(--blur-saturate));
        border: 1px solid var(--border-mix);
        border-radius: var(--border-radius-md);
        padding: 12px 16px;
        color: var(--text-color);
        font-size: 0.95rem;
        font-weight: 500;
        box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15);
        transform: translateX(120%);
        opacity: 0;
        transition: transform 0.3s cubic-bezier(0.2, 0.9, 0.3, 1.1), opacity 0.3s ease;
        display: flex;
        align-items: center;
        gap: 12px;
        pointer-events: auto;
        position: relative;
        counter-increment: notification;
    }

    .notification::before {
        content: counter(notification);
        position: absolute;
        width: 1px;
        height: 1px;
        padding: 0;
        margin: -1px;
        overflow: hidden;
        clip: rect(0, 0, 0, 0);
        white-space: nowrap;
        border: 0;
    }

    .notification.show {
        transform: translateX(0);
        opacity: 1;
    }

    .notification-icon {
        flex-shrink: 0;
        width: 24px;
        height: 24px;
        display: flex;
        align-items: center;
        justify-content: center;
        border-radius: 50%;
    }

    .notification-success .notification-icon {
        color: var(--success-color);
    }

    .notification-success .notification-icon::before {
        content: "✓";
        font-size: 1.2rem;
        font-weight: bold;
    }

    .notification-error .notification-icon {
        color: var(--error-color);
    }

    .notification-error .notification-icon::before {
        content: "✗";
        font-size: 1.2rem;
        font-weight: bold;
    }

    .notification-warning .notification-icon {
        color: var(--warning-color);
    }

    .notification-warning .notification-icon::before {
        content: "⚠";
        font-size: 1.2rem;
        font-weight: bold;
    }

    .notification-message {
        flex: 1;
        word-break: break-word;
    }

    .notification-close {
        background: none;
        border: none;
        color: var(--secondary-color);
        cursor: pointer;
        width: 28px;
        height: 28px;
        display: flex;
        align-items: center;
        justify-content: center;
        border-radius: 50%;
        transition: background-color var(--transition-default);
        flex-shrink: 0;
    }

    .notification-close:hover {
        background-color: color-mix(in srgb, var(--border-color) 70%, transparent);
        color: var(--text-color);
    }

    .notification-close:focus-visible {
        outline: 2px solid var(--primary-color);
        outline-offset: 2px;
    }

    .notification-close::before {
        content: "×";
        font-size: 1.5rem;
        line-height: 1;
    }

    @media (max-width: 480px) {
        .notification-container {
            top: max(12px, env(safe-area-inset-top));
            right: max(12px, env(safe-area-inset-right));
            width: calc(100vw - 24px);
        }
    }

    [data-tooltip] {
        position: relative;
        cursor: help;
    }

    [data-tooltip]::after {
        content: attr(data-tooltip);
        position: absolute;
        bottom: 100%;
        left: 50%;
        transform: translateX(-50%) translateY(-4px);
        background-color: var(--surface-mix);
        backdrop-filter: blur(var(--blur-amount)) saturate(var(--blur-saturate));
        -webkit-backdrop-filter: blur(var(--blur-amount)) saturate(var(--blur-saturate));
        border: 1px solid var(--border-mix);
        border-radius: 8px;
        padding: 6px 10px;
        font-size: 0.8rem;
        white-space: nowrap;
        color: var(--text-color);
        box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
        opacity: 0;
        visibility: hidden;
        transition: opacity 0.2s ease, visibility 0.2s ease, transform 0.2s ease;
        z-index: 20;
        pointer-events: none;
        font-weight: normal;
        line-height: 1.4;
    }

    [data-tooltip]:hover::after,
    [data-tooltip]:focus-visible::after {
        opacity: 1;
        visibility: visible;
        transform: translateX(-50%) translateY(-8px);
    }

    footer [data-tooltip]::after {
        bottom: auto;
        top: 100%;
        transform: translateX(-50%) translateY(4px);
    }

    footer [data-tooltip]:hover::after,
    footer [data-tooltip]:focus-visible::after {
        transform: translateX(-50%) translateY(8px);
    }

    .password-display {
        position: relative;
        margin-bottom: var(--vertical-spacing);
    }

    .password-field {
        position: relative;
        display: flex;
        align-items: center;
        gap: 2px;
        border: 1px solid var(--border-color);
        border-radius: var(--border-radius-md);
        background-color: var(--input-bg);
        padding: 0 2px 0 18px;
        transition: border-color var(--transition-default);
        margin-bottom: 12px;
    }

    .password-field:focus-within {
        border-color: var(--primary-color);
        box-shadow: var(--focus-shadow);
    }

    #password {
        flex: 1;
        min-width: 0;
        border: none;
        background: transparent;
        padding: 18px 0;
        font-size: 1.1rem;
        color: var(--text-color);
        font-family: 'SF Mono', 'Courier New', monospace;
        font-weight: 600;
        letter-spacing: 1px;
        outline: none;
        white-space: nowrap;
        overflow: hidden;
        text-overflow: ellipsis;
        -webkit-appearance: none;
        appearance: none;
    }

    .copy-btn, .visibility-toggle {
        background: none;
        border: none;
        cursor: pointer;
        color: var(--secondary-color);
        padding: 8px;
        border-radius: var(--border-radius-sm);
        display: flex;
        align-items: center;
        justify-content: center;
        transition: all var(--transition-default);
        outline: none;
        min-width: 36px;
        min-height: 36px;
        flex-shrink: 0;
        -webkit-tap-highlight-color: transparent;
    }

    .copy-btn:hover, .visibility-toggle:hover {
        background-color: color-mix(in srgb, var(--border-color) 70%, transparent);
        color: var(--text-color);
    }

    .copy-btn:active, .visibility-toggle:active {
        opacity: 0.7;
        transform: scale(0.96);
    }

    .copy-btn:focus-visible, .visibility-toggle:focus-visible {
        outline: 2px solid var(--primary-color);
        outline-offset: 2px;
        background-color: color-mix(in srgb, var(--border-color) 70%, transparent);
    }

    .copy-btn svg, .visibility-toggle svg {
        width: 20px;
        height: 20px;
        display: block;
        stroke: currentColor;
        fill: none;
    }

    .main-btn {
        background-color: var(--primary-color);
        color: white;
        border: none;
        padding: 16px 20px;
        border-radius: var(--border-radius-md);
        cursor: pointer;
        font-size: 1.1rem;
        font-weight: 600;
        width: 100%;
        box-sizing: border-box;
        white-space: normal;
        word-break: break-word;
        overflow-wrap: break-word;
        text-align: center;
        transition: background-color var(--transition-default), transform 0.1s, opacity 0.1s;
        outline: none;
        min-height: 56px;
        -webkit-tap-highlight-color: transparent;
        touch-action: manipulation;
        box-shadow: 0 4px 12px rgba(0, 122, 255, 0.3);
    }

    .main-btn:hover {
        background-color: var(--primary-hover);
    }

    .main-btn:active {
        transform: scale(0.98);
        opacity: 0.9;
    }

    .main-btn:focus-visible {
        background-color: var(--primary-hover);
        box-shadow: var(--focus-shadow), 0 4px 12px rgba(0, 122, 255, 0.3);
    }

    .main-btn:disabled {
        opacity: 0.6;
        transform: none;
        cursor: not-allowed;
    }

    .section-container {
        margin: var(--vertical-spacing) 0;
        border-radius: var(--border-radius-lg);
        padding: 20px;
        box-shadow: 0 2px 12px rgba(0, 0, 0, 0.02);
    }

    .section-title-wrapper {
        display: flex;
        justify-content: space-between;
        align-items: center;
        margin-bottom: 20px;
    }

    .section-title {
        font-weight: 700;
        color: var(--text-color);
        font-size: 1.3rem;
        letter-spacing: -0.01em;
        margin: 0;
    }

    .sub-section-title {
        font-weight: 600;
        color: var(--secondary-color);
        margin: 12px 0 8px 8px;
        font-size: 1rem;
        text-transform: uppercase;
        letter-spacing: 0.5px;
    }

    .sub-section-title:first-of-type {
        margin-top: 0;
    }

    .reset-btn {
        background: none;
        border: none;
        cursor: pointer;
        color: var(--secondary-color);
        padding: 10px;
        border-radius: var(--border-radius-sm);
        display: flex;
        align-items: center;
        justify-content: center;
        transition: all var(--transition-default);
        outline: none;
        min-width: 44px;
        min-height: 44px;
        flex-shrink: 0;
        -webkit-tap-highlight-color: transparent;
        position: relative;
    }

    .reset-btn:hover {
        background-color: color-mix(in srgb, var(--border-color) 70%, transparent);
        color: var(--text-color);
    }

    .reset-btn:active {
        opacity: 0.7;
        transform: scale(0.96);
    }

    .reset-btn:focus-visible {
        outline: 2px solid var(--primary-color);
        outline-offset: 2px;
        background-color: color-mix(in srgb, var(--border-color) 70%, transparent);
    }

    .reset-btn svg {
        width: 24px;
        height: 24px;
        display: block;
        stroke: currentColor;
        fill: none;
    }

    .ios-list {
        background-color: var(--input-bg);
        border-radius: var(--border-radius-md);
        overflow: hidden;
        margin-bottom: 16px;
    }

    .ios-list:last-child {
        margin-bottom: 0;
    }

    .ios-list > * {
        padding: 12px 16px;
        border-bottom: 1px solid var(--border-color);
        background: transparent;
        transition: background-color 0.1s ease;
        -webkit-tap-highlight-color: transparent;
    }

    .ios-list > :last-child {
        border-bottom: none;
    }

    .ios-list > :active {
        background-color: color-mix(in srgb, var(--border-color) 70%, transparent);
    }

    .setting-item {
        display: flex;
        align-items: center;
        gap: 12px;
    }

    .setting-item label {
        font-weight: 500;
        min-width: 110px;
        font-size: 1rem;
        color: var(--text-color);
    }

    .setting-item input[type=range] {
        -webkit-appearance: none;
        appearance: none;
        flex: 1;
        min-width: 0;
        height: 4px;
        border-radius: 2px;
        background: var(--ios-gray4);
        outline: none;
        cursor: pointer;
        touch-action: manipulation;
    }

    .setting-item input[type=range]:focus-visible {
        box-shadow: var(--focus-shadow);
    }

    .setting-item input[type=range]::-webkit-slider-thumb {
        -webkit-appearance: none;
        width: 22px;
        height: 22px;
        border-radius: 50%;
        background: white;
        border: 2px solid var(--primary-color);
        cursor: pointer;
        box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
        transition: transform 0.1s;
        touch-action: manipulation;
    }

    .setting-item input[type=range]::-webkit-slider-thumb:hover {
        transform: scale(1.1);
    }

    .setting-item input[type=range]::-moz-range-thumb {
        width: 22px;
        height: 22px;
        border-radius: 50%;
        background: white;
        border: 2px solid var(--primary-color);
        cursor: pointer;
        box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
        transition: transform 0.1s;
        touch-action: manipulation;
    }

    .setting-item .length-value {
        font-weight: 600;
        min-width: 40px;
        text-align: center;
        font-size: 1.2rem;
        color: var(--text-color);
    }

    .switch-label {
        display: flex;
        align-items: center;
        justify-content: space-between;
        cursor: pointer;
        user-select: none;
        font-size: 1rem;
        color: var(--text-color);
    }

    .switch {
        position: relative;
        width: 51px;
        height: 31px;
        flex-shrink: 0;
    }

    .switch input {
        opacity: 0;
        width: 0;
        height: 0;
        position: absolute;
    }

    .slider {
        position: absolute;
        cursor: pointer;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background-color: var(--switch-off);
        transition: background-color var(--transition-default);
        border-radius: 31px;
    }

    .slider:hover {
        background-color: var(--ios-gray3);
    }

    .slider:before {
        position: absolute;
        content: "";
        height: 27px;
        width: 27px;
        left: 2px;
        bottom: 2px;
        background-color: var(--switch-knob);
        transition: transform 0.2s cubic-bezier(0.3, 1, 0.5, 1);
        border-radius: 50%;
        box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
        transform: translateX(0);
    }

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

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

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

    .switch:has(input:focus-visible) .slider {
        box-shadow: 0 0 0 2px var(--bg-color), 0 0 0 4px var(--primary-color);
    }

    .features-list {
        display: flex;
        flex-direction: column;
        gap: 16px;
    }

    .feature-text {
        font-size: 1rem;
        line-height: 1.5;
        color: var(--text-color);
        text-align: left;
        padding: 4px 0;
    }

    .feature-text .icon {
        display: inline-block;
        margin-inline-end: 12px;
        vertical-align: middle;
        font-size: 1.3rem;
    }

    footer {
        margin-top: 32px;
        width: 100%;
        max-width: 500px;
        border-radius: var(--border-radius-lg);
        padding: 16px 20px;
        color: var(--secondary-color);
        font-size: 0.95rem;
    }

    .footer-content {
        display: flex;
        align-items: center;
        justify-content: space-between;
        flex-wrap: wrap;
        gap: 12px;
    }

    .footer-info {
        display: flex;
        flex-direction: column;
        line-height: 1.4;
    }

    .footer-app-name {
        font-weight: 600;
        color: var(--text-color);
        font-size: 1rem;
    }

    .footer-version {
        color: var(--secondary-color);
        font-size: 0.85rem;
    }

    .footer-license a {
        color: var(--secondary-color);
        font-size: 0.85rem;
        text-decoration: none;
        border-bottom: 1px dotted transparent;
        transition: border-color var(--transition-default);
    }

    .footer-license a:hover {
        border-bottom-color: var(--primary-color);
    }

    .footer-actions {
        display: flex;
        align-items: center;
        gap: 8px;
    }

    .footer-btn {
        background-color: color-mix(in srgb, var(--input-bg) 70%, transparent);
        backdrop-filter: blur(10px) saturate(180%);
        -webkit-backdrop-filter: blur(10px) saturate(180%);
        border: 1px solid var(--border-mix);
        color: var(--text-color);
        width: 44px;
        height: 44px;
        border-radius: 22px;
        display: flex;
        align-items: center;
        justify-content: center;
        cursor: pointer;
        transition: all var(--transition-default);
        outline: none;
        position: relative;
        -webkit-tap-highlight-color: transparent;
        touch-action: manipulation;
    }

    .footer-btn:hover {
        background-color: color-mix(in srgb, var(--border-color) 70%, transparent);
    }

    .footer-btn:active {
        opacity: 0.7;
        transform: scale(0.96);
    }

    .footer-btn:focus-visible {
        outline: 2px solid var(--primary-color);
        outline-offset: 2px;
    }

    .footer-btn svg {
        width: 24px;
        height: 24px;
        stroke: currentColor;
        fill: none;
    }

    .footer-btn.github-icon svg {
        fill: currentColor;
        stroke: none;
    }

    .footer-btn.hide {
        display: none;
    }

    .modal {
        display: none;
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        z-index: 100;
        align-items: flex-end;
        justify-content: center;
    }

    .modal.show {
        display: flex;
    }

    .modal-overlay {
        position: absolute;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background-color: rgba(0, 0, 0, 0.4);
        backdrop-filter: blur(5px);
        opacity: 0;
        transition: opacity 0.3s ease;
        pointer-events: none;
    }

    .modal.show .modal-overlay {
        opacity: 1;
        pointer-events: auto;
    }

    .modal-content {
        background-color: var(--container-bg);
        border-top-left-radius: var(--border-radius-lg);
        border-top-right-radius: var(--border-radius-lg);
        padding: 16px 20px 24px;
        max-width: 500px;
        width: 100%;
        border: 1px solid var(--border-color);
        border-bottom: none;
        box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.1);
        color: var(--text-color);
        max-height: 80vh;
        overflow-y: auto;
        transform: translateY(100%);
        transition: transform 0.3s cubic-bezier(0.2, 0.9, 0.1, 1);
        position: relative;
        z-index: 101;
    }

    .modal.show .modal-content {
        transform: translateY(0);
    }

    .modal-grabber {
        width: 36px;
        height: 5px;
        background-color: var(--ios-gray3);
        border-radius: 3px;
        margin: 0 auto 16px;
    }

    .modal-header {
        display: flex;
        justify-content: space-between;
        align-items: center;
        margin-bottom: 20px;
        font-size: 1.5rem;
        font-weight: 600;
    }

    .modal-close {
        background: none;
        border: none;
        color: var(--secondary-color);
        font-size: 2rem;
        cursor: pointer;
        width: 44px;
        height: 44px;
        display: flex;
        align-items: center;
        justify-content: center;
        border-radius: 50%;
        transition: background-color var(--transition-default);
        line-height: 1;
    }

    .modal-close:hover {
        background-color: color-mix(in srgb, var(--border-color) 70%, transparent);
    }

    .modal-close:active {
        opacity: 0.7;
        transform: scale(0.96);
    }

    .modal-close:focus-visible {
        outline: none;
        box-shadow: 0 0 0 2px var(--bg-color), 0 0 0 4px var(--primary-color);
        border-radius: 50%;
    }

    .modal-body p {
        margin: 10px 0;
    }

    .modal-body a {
        color: var(--primary-color);
        text-decoration: none;
    }

    .modal-body a:hover {
        text-decoration: underline;
    }
}

@layer utilities {
    .hide {
        display: none !important;
    }
}

@media (max-width: 600px) {
    .footer-content {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }
    .footer-info {
        align-items: center;
    }
}

@media (max-width: 480px) {
    body {
        padding: 12px;
        padding-top: max(12px, env(safe-area-inset-top));
        padding-bottom: max(12px, env(safe-area-inset-bottom));
        padding-left: max(12px, env(safe-area-inset-left));
        padding-right: max(12px, env(safe-area-inset-right));
    }
    .section-container {
        padding: 16px;
    }
    footer {
        padding: 14px 16px;
    }
}

@media (max-width: 400px) {
    .setting-item {
        flex-wrap: wrap;
    }
    .setting-item label {
        min-width: 100%;
        margin-bottom: 8px;
    }
}

@media (max-width: 380px) {
    .copy-btn, .visibility-toggle {
        min-width: 34px;
        min-height: 34px;
        padding: 6px;
    }
    .copy-btn svg, .visibility-toggle svg {
        width: 18px;
        height: 18px;
    }
}

@media (max-width: 360px) {
    body {
        padding: 8px;
        padding-top: max(8px, env(safe-area-inset-top));
        padding-bottom: max(8px, env(safe-area-inset-bottom));
        padding-left: max(8px, env(safe-area-inset-left));
        padding-right: max(8px, env(safe-area-inset-right));
    }
    .main-btn {
        font-size: 1rem;
        padding: 14px 16px;
    }
    .copy-btn, .visibility-toggle {
        min-width: 32px;
        min-height: 32px;
        padding: 4px;
    }
    .copy-btn svg, .visibility-toggle svg {
        width: 16px;
        height: 16px;
    }
}

@media (max-width: 320px) {
    .container {
        padding: 12px;
    }
    .copy-btn, .visibility-toggle {
        min-width: 30px;
        min-height: 30px;
        padding: 4px;
    }
    .copy-btn svg, .visibility-toggle svg {
        width: 14px;
        height: 14px;
    }
    .main-btn {
        font-size: 0.9rem;
        padding: 10px 12px;
        overflow-wrap: break-word;
    }
}