:root {
    --bg-primary: #f5f2e8;
    --bg-secondary: #eaf6f6;
    --surface: #fffdf7;
    --surface-strong: #ffffff;
    --ink: #1f2a36;
    --ink-muted: #4f5d6b;
    --accent: #155d74;
    --accent-soft: #d8eef4;
    --ok: #0d7d53;
    --error: #a2342f;
    --border: #d6dde4;
    --shadow: 0 12px 30px rgba(31, 42, 54, 0.12);
    --radius-lg: 18px;
    --radius-md: 12px;
    --radius-sm: 8px;
}

* {
    box-sizing: border-box;
}

html,
body {
    margin: 0;
    min-height: 100%;
}

body {
    position: relative;
    padding: 24px;
    color: var(--ink);
    background:
        radial-gradient(circle at 18% 18%, rgba(84, 168, 190, 0.24), transparent 42%),
        radial-gradient(circle at 82% 12%, rgba(237, 155, 87, 0.24), transparent 38%),
        linear-gradient(150deg, var(--bg-primary), var(--bg-secondary));
    font-family: "Trebuchet MS", "Gill Sans", "Verdana", sans-serif;
}

.bg-shape {
    position: fixed;
    z-index: 0;
    border-radius: 999px;
    filter: blur(16px);
    pointer-events: none;
}

.shape-a {
    top: -90px;
    right: -50px;
    width: 240px;
    height: 240px;
    background: rgba(21, 93, 116, 0.18);
}

.shape-b {
    left: -60px;
    bottom: -110px;
    width: 280px;
    height: 280px;
    background: rgba(180, 95, 52, 0.16);
}

.app-shell {
    position: relative;
    z-index: 1;
    max-width: 980px;
    margin: 0 auto;
    background: rgba(255, 253, 247, 0.92);
    border: 1px solid rgba(214, 221, 228, 0.9);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    backdrop-filter: blur(4px);
    overflow: hidden;
}

.hero {
    padding: 28px 28px 18px;
    background: linear-gradient(135deg, rgba(21, 93, 116, 0.08), rgba(237, 155, 87, 0.12));
    border-bottom: 1px solid var(--border);
}

.eyebrow {
    margin: 0 0 8px;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    font-size: 0.76rem;
    color: var(--ink-muted);
}

h1 {
    margin: 0;
    font-size: clamp(1.5rem, 2.8vw, 2.1rem);
}

.subtitle {
    margin: 10px 0 0;
    max-width: 70ch;
    color: var(--ink-muted);
    line-height: 1.45;
}

.hero-links {
    margin: 12px 0 0;
    display: flex;
    flex-wrap: wrap;
    gap: 8px 14px;
}

.hero-links a {
    color: var(--accent);
    font-weight: 700;
    text-decoration: none;
    border-bottom: 1px dashed rgba(21, 93, 116, 0.45);
}

.hero-links a:hover {
    border-bottom-color: var(--accent);
}

.tabs {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    border-bottom: 1px solid var(--border);
    background: var(--surface);
}

.tab-button {
    border: 0;
    border-right: 1px solid var(--border);
    padding: 14px 16px;
    background: transparent;
    color: var(--ink-muted);
    font-size: 0.98rem;
    font-weight: 700;
    cursor: pointer;
    transition: background 160ms ease, color 160ms ease;
}

.tab-button:last-child {
    border-right: 0;
}

.tab-button:hover {
    background: rgba(21, 93, 116, 0.07);
    color: var(--ink);
}

.tab-button.is-active {
    color: var(--accent);
    background: rgba(21, 93, 116, 0.12);
}

.options-strip {
    display: flex;
    flex-wrap: wrap;
    gap: 10px 14px;
    align-items: center;
    padding: 12px 16px;
    border-bottom: 1px solid var(--border);
    background: linear-gradient(180deg, rgba(216, 238, 244, 0.42), rgba(255, 255, 255, 0.7));
}

.option-check {
    display: inline-flex;
    align-items: center;
    gap: 7px;
    font-weight: 700;
    color: var(--ink);
    cursor: pointer;
}

.option-check input {
    width: 18px;
    height: 18px;
    accent-color: var(--accent);
}


.panel {
    display: none;
    padding: 24px 24px 30px;
}

.panel.is-active {
    display: block;
}

.panel-header h2 {
    margin: 0;
    font-size: 1.16rem;
}

.panel-header p {
    margin: 8px 0 0;
    color: var(--ink-muted);
    line-height: 1.42;
}

.input-row {
    margin-top: 18px;
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

input[type="file"] {
    flex: 1 1 300px;
    padding: 10px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background: var(--surface-strong);
    color: var(--ink);
}

.field-label {
    display: inline-block;
    margin-top: 18px;
    margin-bottom: 8px;
    font-weight: 700;
}

textarea {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background: var(--surface-strong);
    color: var(--ink);
    resize: vertical;
    min-height: 120px;
    font-size: 0.95rem;
    line-height: 1.4;
}

.primary-btn {
    border: 0;
    border-radius: 999px;
    background: var(--accent);
    color: #fff;
    padding: 11px 18px;
    cursor: pointer;
    font-weight: 700;
    transition: transform 120ms ease, filter 120ms ease;
}

.primary-btn:hover {
    filter: brightness(1.05);
    transform: translateY(-1px);
}

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

.feedback {
    margin: 16px 0 0;
    padding: 10px 12px;
    border-radius: var(--radius-sm);
    border: 1px solid transparent;
    font-size: 0.92rem;
}

.feedback.info {
    color: var(--ink-muted);
    background: rgba(79, 93, 107, 0.08);
    border-color: rgba(79, 93, 107, 0.16);
}

.feedback.success {
    color: var(--ok);
    background: rgba(13, 125, 83, 0.1);
    border-color: rgba(13, 125, 83, 0.28);
}

.feedback.error {
    color: var(--error);
    background: rgba(162, 52, 47, 0.1);
    border-color: rgba(162, 52, 47, 0.28);
}

.results {
    margin-top: 14px;
    display: grid;
    gap: 12px;
}

.seo-content {
    border-top: 1px solid var(--border);
    padding: 18px 24px 30px;
    background: linear-gradient(180deg, rgba(216, 238, 244, 0.2), rgba(255, 255, 255, 0.7));
}

.seo-content h2 {
    margin: 0 0 8px;
    font-size: 1.12rem;
}

.seo-content h3 {
    margin: 14px 0 8px;
    font-size: 1rem;
}

.seo-content p {
    margin: 8px 0;
    line-height: 1.45;
    color: var(--ink-muted);
}

.faq-item {
    margin-top: 10px;
    padding: 10px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background: rgba(255, 255, 255, 0.78);
}

.faq-item h4 {
    margin: 0;
    font-size: 0.95rem;
}

.faq-item p {
    margin: 6px 0 0;
}

.result-card {
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    background: var(--surface-strong);
    padding: 12px;
}

.result-top {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
}

.status-pill {
    padding: 5px 10px;
    border-radius: 999px;
    font-size: 0.78rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.status-pill.converted {
    color: var(--ok);
    background: rgba(13, 125, 83, 0.12);
}

.status-pill.failed {
    color: var(--error);
    background: rgba(162, 52, 47, 0.12);
}

.card-body {
    margin-top: 10px;
    display: grid;
    gap: 10px;
}

.code-block {
    margin: 0;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background: #f9fbfd;
    padding: 10px;
    font-size: 0.84rem;
    overflow-x: auto;
    white-space: pre-wrap;
    word-break: break-word;
}

.copy-btn {
    justify-self: start;
    border: 1px solid var(--border);
    border-radius: 999px;
    background: #fff;
    color: var(--ink);
    padding: 7px 12px;
    font-size: 0.82rem;
    font-weight: 700;
    cursor: pointer;
}

.copy-btn:disabled {
    opacity: 0.55;
    cursor: not-allowed;
}

.error-text {
    margin: 0;
    color: var(--error);
    font-size: 0.85rem;
}

code {
    font-family: "Consolas", "Monaco", "Courier New", monospace;
    background: rgba(79, 93, 107, 0.08);
    border-radius: 4px;
    padding: 0 4px;
}

@media (max-width: 700px) {
    body {
        padding: 12px;
    }

    .hero {
        padding: 18px 16px 14px;
    }

    .panel {
        padding: 16px;
    }

    .seo-content {
        padding: 14px 16px 20px;
    }

    .tab-button {
        padding: 12px 10px;
        font-size: 0.92rem;
    }

    .options-strip {
        align-items: flex-start;
        gap: 9px;
        padding: 12px;
    }

    .input-row {
        flex-direction: column;
    }

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