:root {
    --tools-bg-start: #f5fbff;
    --tools-bg-end: #e9f1ff;
    --tools-grid-color: rgba(34, 84, 153, 0.08);
    --tools-text-primary: #0e2b4a;
    --tools-text-secondary: #54708b;
    --tools-accent: #1672ff;
    --tools-accent-dark: #0d4b9c;
    --tools-card-bg: rgba(255, 255, 255, 0.95);
    --tools-card-shadow: 0 28px 80px rgba(26, 86, 168, 0.18);
    --tools-border: rgba(22, 114, 255, 0.12);
    --status-pass-bg: #ecfdf5;
    --status-pass-text: #047857;
    --status-warn-bg: #fff7ed;
    --status-warn-text: #b45309;
    --status-fail-bg: #fef2f2;
    --status-fail-text: #b91c1c;
}

.tools-body {
    margin: 0;
    font-family: 'Inter', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    color: var(--tools-text-primary);
    background:
        radial-gradient(circle at 18% 12%, rgba(22, 114, 255, 0.10) 0%, transparent 55%),
        radial-gradient(circle at 82% 8%, rgba(14, 90, 193, 0.10) 0%, transparent 60%),
        linear-gradient(180deg, var(--tools-bg-start) 0%, var(--tools-bg-end) 100%);
    min-height: 100vh;
}

.tools-body::before {
    content: "";
    position: fixed;
    inset: 0;
    pointer-events: none;
    background-image:
        linear-gradient(0deg, var(--tools-grid-color) 1px, transparent 1px),
        linear-gradient(90deg, var(--tools-grid-color) 1px, transparent 1px);
    background-size: 60px 60px;
    opacity: 0.6;
}

.tools-main {
    max-width: 1080px;
    margin: 0 auto;
    padding: 80px 20px 120px;
}

.hero {
    text-align: center;
    position: relative;
    padding-bottom: 64px;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 18px;
    border-radius: 999px;
    background: rgba(22, 114, 255, 0.12);
    color: var(--tools-accent);
    font-weight: 600;
    margin-bottom: 20px;
}

.hero-title {
    font-size: clamp(2.2rem, 4vw, 3rem);
    font-weight: 700;
    margin-bottom: 12px;
    letter-spacing: 0.02em;
}

.hero-title-accent {
    color: var(--tools-accent);
}

.hero-subtitle {
    color: var(--tools-text-secondary);
    font-size: 1.05rem;
    margin-bottom: 40px;
}

.checker-card {
    max-width: 760px;
    margin: 0 auto;
    background: var(--tools-card-bg);
    border-radius: 32px;
    box-shadow: var(--tools-card-shadow);
    padding: 36px;
    position: relative;
}

.checker-form {
    margin: 0;
}

.checker-input {
    display: flex;
    align-items: center;
    gap: 18px;
    background: rgba(255, 255, 255, 0.95);
    border-radius: 24px;
    padding: 18px 24px;
    border: 1px solid rgba(22, 114, 255, 0.15);
    box-shadow: inset 0 1px 2px rgba(15, 40, 80, 0.08);
}

.checker-input i {
    font-size: 1.25rem;
    color: var(--tools-accent);
}

.checker-input input {
    flex: 1;
    border: none;
    background: transparent;
    outline: none;
    font-size: 1.05rem;
    color: var(--tools-text-primary);
}

.checker-input input::placeholder {
    color: rgba(15, 43, 74, 0.45);
}

.checker-submit {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: linear-gradient(135deg, var(--tools-accent) 0%, var(--tools-accent-dark) 100%);
    color: #fff;
    font-weight: 600;
    border: none;
    border-radius: 999px;
    padding: 12px 22px;
    cursor: pointer;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    box-shadow: 0 10px 24px rgba(22, 114, 255, 0.35);
}

.checker-submit:hover,
.checker-submit:focus {
    transform: translateY(-1px);
    box-shadow: 0 16px 32px rgba(22, 114, 255, 0.4);
}

.checker-submit:disabled {
    cursor: not-allowed;
    opacity: 0.8;
    transform: none;
    box-shadow: none;
}

.checker-feedback {
    margin-top: 18px;
    font-size: 0.95rem;
    color: var(--tools-text-secondary);
}

.checker-feedback[data-state="error"] {
    color: var(--status-fail-text);
}

.result-section {
    margin-top: 60px;
}

.result-card {
    background: var(--tools-card-bg);
    border-radius: 36px;
    box-shadow: var(--tools-card-shadow);
    padding: 40px;
    display: grid;
    gap: 32px;
}

.result-summary {
    text-align: center;
    display: grid;
    gap: 16px;
}

.result-summary h2 {
    font-size: 1.6rem;
    font-weight: 700;
    margin: 0;
}

.result-summary p {
    margin: 0 auto;
    max-width: 520px;
    color: var(--tools-text-secondary);
}

.result-tag {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    font-weight: 600;
    padding: 8px 18px;
    border-radius: 999px;
    font-size: 0.95rem;
    width: fit-content;
    margin: 0 auto;
}

.result-tag.status-pass {
    background: var(--status-pass-bg);
    color: var(--status-pass-text);
}

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

.result-tag.status-fail {
    background: var(--status-fail-bg);
    color: var(--status-fail-text);
}

.recommendation-list {
    list-style: none;
    padding: 0;
    margin: 0;
    display: grid;
    gap: 10px;
}

.recommendation-list li {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    color: var(--tools-text-secondary);
    justify-content: center;
}

.recommendation-list li::before {
    content: "\f431";
    font-family: "Bootstrap Icons";
    color: var(--tools-accent);
    font-size: 1rem;
}

.result-grid {
    display: grid;
    gap: 20px;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

.check-card {
    border: 1px solid rgba(22, 114, 255, 0.15);
    border-radius: 24px;
    padding: 24px;
    background: rgba(255, 255, 255, 0.96);
    position: relative;
    overflow: hidden;
    display: grid;
    gap: 14px;
}

.check-card-header {
    display: flex;
    align-items: center;
    gap: 12px;
}

.check-card-title {
    font-weight: 600;
    margin: 0;
}

.check-card-status {
    font-size: 0.85rem;
    padding: 4px 10px;
    border-radius: 999px;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.check-card-status.pass {
    background: var(--status-pass-bg);
    color: var(--status-pass-text);
}

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

.check-card-status.fail {
    background: var(--status-fail-bg);
    color: var(--status-fail-text);
}

.check-card-summary {
    color: var(--tools-text-secondary);
    font-size: 0.95rem;
    margin: 0;
}

.check-card-details {
    list-style: none;
    padding: 0;
    margin: 0;
    display: grid;
    gap: 8px;
    color: rgba(14, 43, 74, 0.8);
    font-size: 0.92rem;
}

.check-card-details li {
    position: relative;
    padding-left: 18px;
}

.check-card-details li::before {
    content: '\2022';
    position: absolute;
    left: 0;
    color: rgba(22, 114, 255, 0.45);
}

.matched-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.matched-tag {
    padding: 4px 10px;
    border-radius: 999px;
    background: rgba(22, 114, 255, 0.12);
    color: var(--tools-accent);
    font-size: 0.85rem;
}

.check-card-footer {
    color: var(--tools-text-secondary);
    font-size: 0.88rem;
}

.faq-section {
    margin-top: 80px;
}

.faq-header {
    text-align: center;
    margin-bottom: 40px;
    display: grid;
    gap: 12px;
}

.faq-eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 16px;
    border-radius: 999px;
    background: rgba(22, 114, 255, 0.12);
    color: var(--tools-accent);
    font-weight: 600;
}

.faq-header h2 {
    font-weight: 700;
    font-size: clamp(1.6rem, 3vw, 2.2rem);
    margin: 0;
}

.faq-list {
    display: grid;
    gap: 16px;
}

.faq-item {
    border: 1px solid rgba(22, 114, 255, 0.15);
    border-radius: 20px;
    background: rgba(255, 255, 255, 0.95);
    overflow: hidden;
    box-shadow: 0 12px 24px rgba(26, 86, 168, 0.08);
}

.faq-item summary {
    cursor: pointer;
    list-style: none;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding: 22px 26px;
    font-weight: 600;
    color: var(--tools-text-primary);
}

.faq-item summary::-webkit-details-marker {
    display: none;
}

.faq-item[open] summary {
    background: rgba(22, 114, 255, 0.05);
}

.faq-summary {
    display: inline-flex;
    align-items: center;
    gap: 10px;
}

.faq-body {
    padding: 0 26px 26px;
    color: var(--tools-text-secondary);
    font-size: 0.96rem;
    display: grid;
    gap: 18px;
}

.faq-bullets {
    margin: 0;
    padding-left: 18px;
    display: grid;
    gap: 10px;
}

.faq-examples {
    background: rgba(22, 114, 255, 0.05);
    border-radius: 16px;
    padding: 16px 18px;
}

.faq-example-title {
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--tools-text-primary);
}

.faq-example-list {
    list-style: none;
    padding: 0;
    margin: 0;
    display: grid;
    gap: 10px;
}

.example {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    font-size: 0.95rem;
    color: var(--tools-text-secondary);
}

.example-icon {
    font-family: "Bootstrap Icons";
    font-size: 1rem;
    line-height: 1.4;
}

.example-good .example-icon::before {
    content: "\f26a";
    color: #16a34a;
}

.example-warning .example-icon::before {
    content: "\f5c2";
    color: #d97706;
}

.example-bad .example-icon::before {
    content: "\f623";
    color: #dc2626;
}

@media (max-width: 768px) {
    .tools-main {
        padding: 60px 16px 100px;
    }

    .checker-card {
        padding: 26px;
    }

    .checker-input {
        flex-direction: column;
        align-items: stretch;
        gap: 12px;
        padding: 18px;
    }

    .checker-input input {
        width: 100%;
        font-size: 1rem;
    }

    .checker-submit {
        width: 100%;
        justify-content: center;
    }

    .result-card {
        padding: 28px;
    }
}