:root {
    --bg-page: #F8FAFC;
    --bg-card: #FFFFFF;
    --border-color: #E2E8F0;
    --border-focus: #2563EB;

    --text-primary: #1E293B;
    --text-secondary: #64748B;
    --text-code: #334155;
    --text-error: #DC2626;

    --blue-bg: #EFF6FF;
    --blue-border: #DBEAFE;
    --blue-accent: #2563EB;

    --green-bg: #F0FDF4;
    --green-border: #DCFCE7;
    --green-accent: #16A34A;
    --green-code-bg: rgba(255, 255, 255, 0.6);

    --error-bg: #FEF2F2;
    --error-border: #FECACA;

    --details-bg: #FAFAFA;
    --btn-hover-bg: #0F172A;
    --input-bg: #FFFFFF;
    --drop-bg: #F1F5F9;

    --radius: 12px;
    --transition-speed: 0.3s;
    --easing: cubic-bezier(0.16, 1, 0.3, 1);
    --shadow: 0 1px 3px 0 rgb(0 0 0 / 0.05);
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg-page: #0F172A;
        --bg-card: #1E293B;
        --border-color: #334155;
        --border-focus: #60A5FA;

        --text-primary: #F1F5F9;
        --text-secondary: #94A3B8;
        --text-code: #CBD5E1;
        --text-error: #F87171;

        --blue-bg: rgba(37, 99, 235, 0.1);
        --blue-border: rgba(37, 99, 235, 0.2);
        --blue-accent: #60A5FA;

        --green-bg: rgba(22, 163, 74, 0.1);
        --green-border: rgba(22, 163, 74, 0.2);
        --green-accent: #4ADE80;
        --green-code-bg: rgba(0, 0, 0, 0.2);

        --error-bg: rgba(220, 38, 38, 0.1);
        --error-border: rgba(220, 38, 38, 0.2);

        --details-bg: #0F172A;
        --btn-hover-bg: #334155;
        --input-bg: #0F172A;
        --drop-bg: #334155;
        --shadow: none;
    }
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    outline: none;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background-color: var(--bg-page);
    color: var(--text-primary);
    line-height: 1.6;
    display: flex;
    justify-content: center;
    min-height: 100vh;
    padding: 40px 20px;
    transition: background-color var(--transition-speed);
}

.container {
    width: 100%;
    max-width: 640px;
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    overflow: hidden;
    transition: background-color var(--transition-speed), border-color var(--transition-speed);
}


.loading-overlay {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    color: var(--text-secondary);
    font-size: 14px;
}

.manual-load-area {
    padding: 20px;
    background: var(--details-bg);
    border-bottom: 1px solid var(--border-color);
    display: none;
}

.error-title {
    color: var(--text-error);
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 8px;
    display: flex;
    align-items: center;
    gap: 6px;
}

.error-desc {
    font-size: 13px;
    color: var(--text-secondary);
    margin-bottom: 12px;
}

.manual-input-row {
    display: flex;
    gap: 10px;
}

.step-0 {
    padding: 0;
}

.step-0-inner {
    padding: 24px;
}

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

.identity-title {
    font-size: 13px;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.tag-badge {
    background: var(--border-color);
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 11px;
    font-weight: 700;
    color: var(--text-secondary);
    transition: background 0.3s;
}

.fingerprint-main {
    font-family: Consolas, "Monaco", monospace;
    font-size: 20px;
    font-weight: 500;
    color: var(--text-primary);
    letter-spacing: -0.5px;
    margin-bottom: 16px;
    word-spacing: -2px; /* 紧凑一点 */
}

.actions-row {
    display: flex;
    gap: 16px;
    align-items: center;
    font-size: 14px;
}

.btn-link {
    color: var(--blue-accent);
    text-decoration: none;
    cursor: pointer;
    border: none;
    background: none;
    padding: 4px 0;
    display: flex;
    align-items: center;
    gap: 6px;
    transition: opacity 0.2s;
    font-weight: 500;
    font-size: 14px;
}

.btn-link:hover { opacity: 0.8; }
.btn-link:disabled { color: var(--text-secondary); cursor: not-allowed; opacity: 0.5; }

.details-wrapper {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s var(--easing), opacity 0.4s var(--easing), margin-top 0.4s var(--easing);
    opacity: 0;
    background-color: var(--details-bg);
    border-radius: 8px;
    margin-top: 0;
}

.details-wrapper.open {
    margin-top: 16px;
    opacity: 1;
    max-height: 250px;
    border: 1px solid var(--border-color);
}

.details-content {
    padding: 16px;
    font-size: 13px;
    color: var(--text-secondary);
}

.detail-item {
    display: flex;
    margin-bottom: 8px;
}
.detail-item:last-child { margin-bottom: 0; }
.detail-label { margin-right: 10px; font-weight: 500; opacity: 0.8; }
.detail-value { font-family: Consolas, monospace; flex: 1; word-break: break-all; color: var(--text-code); }

.step-1 {
    padding: 24px;
    border-left: 4px solid transparent;
}

.step-title {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--text-primary);
}

textarea {
    width: 100%;
    min-height: 180px;
    padding: 16px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-family: inherit;
    font-size: 16px;
    resize: vertical;
    transition: border-color 0.2s, background-color 0.2s;
    margin-bottom: 20px;
    background: var(--input-bg);
    color: var(--text-primary);
}

textarea.drag-active {
    border-color: var(--blue-accent);
    background-color: var(--drop-bg);
    border-style: dashed;
}

textarea:focus {
    border-color: var(--border-focus);
    box-shadow: 0 0 0 3px var(--blue-bg);
}

textarea:disabled {
    background: var(--bg-page);
    cursor: not-allowed;
    opacity: 0.7;
}

.btn-copy-icon {
    margin-left: auto;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 6px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s var(--easing);
    color: var(--text-secondary);
}

.btn-copy-icon:hover {
    border-color: var(--green-accent);
    color: var(--green-accent);
    background: var(--green-bg);
}

.btn-copy-icon .icon {
    width: 18px;
    height: 18px;
}

.btn-primary {
    background-color: var(--text-primary);
    color: var(--bg-page);
    border: 1px solid transparent;
    padding: 12px 24px;
    border-radius: 8px;
    font-size: 15px;
    font-weight: 500;
    cursor: pointer;
    width: 100%;
    transition: all 0.2s;
}

@media (prefers-color-scheme: dark) {
    .btn-primary { background-color: #3B82F6; color: white; }
    .btn-primary:hover { background-color: #2563EB; }
}

@media (prefers-color-scheme: light) {
        .btn-primary:hover { background-color: var(--btn-hover-bg); }
}

.btn-primary:active { transform: scale(0.98); }

.btn-primary:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
    background-color: var(--text-secondary);
}

.btn-xs {
    padding: 6px 12px;
    font-size: 13px;
    border-radius: 6px;
    border: 1px solid var(--border-color);
    background: var(--bg-card);
    color: var(--text-primary);
    cursor: pointer;
}
.btn-xs:hover { background: var(--bg-page); }

.step-1.archived {
    background-color: var(--blue-bg);
    border-color: var(--blue-border);
    border-left-color: var(--blue-accent);
}

.input-wrapper {
    transition: max-height 0.5s var(--easing), opacity 0.3s var(--easing);
    max-height: 600px;
    opacity: 1;
    overflow: hidden;
}

.step-1.archived .input-wrapper {
    max-height: 0;
    opacity: 0;
    margin-bottom: 0;
}

.step-1.archived .step-title {
    margin-bottom: 0;
    color: var(--blue-accent);
}

.archived-msg {
    display: none;
    font-size: 14px;
    color: var(--blue-accent);
    margin-left: auto;
    font-weight: 500;
}

.step-1.archived .archived-msg {
    display: flex;
    align-items: center;
    gap: 6px;
}

.step-2 {
    display: none;
    background-color: var(--green-bg);
    border-color: var(--green-border);
    padding: 24px;
    animation: slideUp 0.5s var(--easing) forwards;
    border-left: 4px solid var(--green-accent);
}

@keyframes slideUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.result-area {
    font-family: Consolas, monospace;
    font-size: 13px;
    background: var(--green-code-bg);
    border: 1px dashed var(--green-accent);
    padding: 16px;
    border-radius: 8px;
    color: var(--text-code);
    margin-bottom: 20px;
    white-space: pre-wrap;
    word-break: break-all;
    max-height: 200px;
    overflow-y: auto;
}

.result-actions {
    display: flex;
    gap: 12px;
    margin-bottom: 16px;
}

.btn-secondary {
    flex: 1;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 10px;
    border-radius: 6px;
    font-size: 14px;
    cursor: pointer;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 8px;
    transition: all 0.2s;
    text-decoration: none;
    font-weight: 500;
}

.btn-secondary:hover {
    border-color: var(--text-secondary);
    background: var(--bg-page);
}

.reset-link {
    display: block;
    text-align: center;
    font-size: 13px;
    color: var(--text-secondary);
    text-decoration: underline;
    text-decoration-thickness: 1px;
    text-underline-offset: 4px;
    cursor: pointer;
    margin-top: 10px;
    transition: color 0.2s;
}

.reset-link:hover { color: var(--text-primary); }

.footer {
    text-align: center;
    font-size: 12px;
    color: var(--text-secondary);
    margin-top: 12px;
    opacity: 0.6;
}

.icon {
    width: 16px;
    height: 16px;
    stroke: currentColor;
    stroke-width: 2;
    fill: none;
    stroke-linecap: round;
    stroke-linejoin: round;
}

@media (max-width: 480px) {
    body { padding: 20px 16px; }
    .step-0-inner, .step-1, .step-2 { padding: 20px; }
    .fingerprint-main { font-size: 16px; }
    .result-actions { flex-direction: column; }
    .manual-input-row { flex-direction: column; }
}