:root {
    --bg-top: #f6efe6;
    --bg-bottom: #dfe9f3;
    --surface: rgba(255, 255, 255, 0.88);
    --surface-border: rgba(26, 39, 57, 0.08);
    --shadow: 0 28px 70px rgba(34, 44, 64, 0.14);
    --text: #1c2430;
    --muted: #5d697a;
    --accent: #d95f43;
    --accent-hover: #bf4f35;
    --accent-soft: rgba(217, 95, 67, 0.14);
    --success: #2b7a4b;
    --error: #a93333;
    --field-bg: rgba(248, 250, 252, 0.92);
}

*,
*::before,
*::after {
    box-sizing: border-box;
}

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

body {
    font-family: "Manrope", sans-serif;
    color: var(--text);
    background:
        radial-gradient(circle at top left, rgba(255, 255, 255, 0.9), transparent 38%),
        radial-gradient(circle at bottom right, rgba(255, 255, 255, 0.7), transparent 32%),
        linear-gradient(135deg, var(--bg-top), var(--bg-bottom));
}

body::before,
body::after {
    content: "";
    position: fixed;
    inset: auto;
    border-radius: 999px;
    pointer-events: none;
    filter: blur(8px);
    opacity: 0.65;
}

body::before {
    width: 22rem;
    height: 22rem;
    top: -7rem;
    right: -5rem;
    background: rgba(217, 95, 67, 0.2);
}

body::after {
    width: 18rem;
    height: 18rem;
    left: -6rem;
    bottom: -4rem;
    background: rgba(58, 120, 177, 0.16);
}

.app-shell {
    min-height: 100vh;
    display: grid;
    place-items: center;
    padding: 24px;
}

.card {
    width: min(100%, 760px);
    padding: 38px;
    border: 1px solid var(--surface-border);
    border-radius: 28px;
    background: var(--surface);
    backdrop-filter: blur(16px);
    box-shadow: var(--shadow);
}

.workspace-tabs {
    display: inline-flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 26px;
    padding: 8px;
    border-radius: 999px;
    background: rgba(28, 36, 48, 0.05);
}

.workspace-tab {
    min-height: 46px;
    padding: 0 18px;
    border: 0;
    border-radius: 999px;
    background: transparent;
    color: var(--muted);
    font: inherit;
    font-size: 0.95rem;
    font-weight: 800;
    cursor: pointer;
    transition: background 0.2s ease, color 0.2s ease, transform 0.2s ease;
}

.workspace-tab:hover {
    transform: translateY(-1px);
}

.workspace-tab.is-active {
    background: linear-gradient(135deg, var(--accent), #f08750);
    color: #fff;
    box-shadow: 0 14px 28px rgba(217, 95, 67, 0.2);
}

.workspace-panel {
    display: block;
}

.workspace-panel[hidden] {
    display: none;
}

.eyebrow {
    margin: 0 0 10px;
    font-size: 0.82rem;
    font-weight: 800;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    color: var(--accent);
}

h1 {
    margin: 0;
    font-size: clamp(2rem, 4vw, 3.3rem);
    line-height: 1;
}

.intro {
    margin: 16px 0 30px;
    max-width: 56ch;
    font-size: 1.02rem;
    line-height: 1.7;
    color: var(--muted);
}

.converter-form {
    display: grid;
    gap: 14px;
}

.field-label {
    font-size: 0.95rem;
    font-weight: 700;
}

.url-field {
    width: 100%;
    min-height: 120px;
    padding: 18px 20px;
    border: 1px solid rgba(37, 48, 62, 0.12);
    border-radius: 18px;
    background: var(--field-bg);
    font: inherit;
    color: inherit;
    resize: vertical;
    transition: border-color 0.2s ease, box-shadow 0.2s ease, transform 0.2s ease;
}

.url-field:focus {
    outline: none;
    border-color: rgba(217, 95, 67, 0.65);
    box-shadow: 0 0 0 5px var(--accent-soft);
    transform: translateY(-1px);
}

.file-field {
    width: 100%;
    padding: 16px 18px;
    border: 1px solid rgba(37, 48, 62, 0.12);
    border-radius: 18px;
    background: var(--field-bg);
    font: inherit;
    color: inherit;
}

.file-field::file-selector-button {
    margin-right: 14px;
    padding: 10px 16px;
    border: 0;
    border-radius: 999px;
    background: rgba(28, 36, 48, 0.08);
    color: var(--text);
    font: inherit;
    font-weight: 800;
    cursor: pointer;
}

.file-field:focus {
    outline: none;
    border-color: rgba(217, 95, 67, 0.65);
    box-shadow: 0 0 0 5px var(--accent-soft);
}

.target-size-box {
    display: grid;
    gap: 10px;
}

.target-size-fields {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 12px;
}

.size-input,
.size-select {
    min-height: 56px;
    padding: 0 18px;
    border: 1px solid rgba(37, 48, 62, 0.12);
    border-radius: 18px;
    background: var(--field-bg);
    font: inherit;
    color: inherit;
}

.size-select {
    min-width: 110px;
}

.size-input:focus,
.size-select:focus {
    outline: none;
    border-color: rgba(217, 95, 67, 0.65);
    box-shadow: 0 0 0 5px var(--accent-soft);
}

.field-help {
    margin: 0;
    color: var(--muted);
    font-size: 0.92rem;
    line-height: 1.6;
}

.submit-button {
    position: relative;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: fit-content;
    min-width: 188px;
    min-height: 56px;
    padding: 0 28px;
    border: 0;
    border-radius: 999px;
    background: linear-gradient(135deg, var(--accent), #f08750);
    color: #fff;
    font: inherit;
    font-weight: 800;
    cursor: pointer;
    box-shadow: 0 18px 36px rgba(217, 95, 67, 0.28);
    transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

.submit-button:hover {
    transform: translateY(-1px);
    box-shadow: 0 22px 44px rgba(217, 95, 67, 0.34);
    background: linear-gradient(135deg, var(--accent-hover), #e07c4a);
}

.submit-button:disabled {
    cursor: progress;
    opacity: 0.9;
}

.button-loader {
    display: none;
    width: 18px;
    height: 18px;
    border: 2px solid rgba(255, 255, 255, 0.35);
    border-top-color: #fff;
    border-radius: 50%;
    animation: spin 0.9s linear infinite;
}

.submit-button.is-loading .button-text {
    display: none;
}

.submit-button.is-loading .button-loader {
    display: block;
}

.status-message {
    min-height: 1.6em;
    margin: 16px 0 0;
    font-size: 0.96rem;
    font-weight: 600;
}

.status-message.is-success {
    color: var(--success);
}

.status-message.is-error {
    color: var(--error);
}

.status-message.is-loading {
    color: var(--muted);
}

.status-message.is-warning {
    color: #8b5a2b;
}

.merge-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    align-items: center;
}

.merge-files-list {
    display: grid;
    gap: 12px;
}

.merge-file-item {
    display: grid;
    grid-template-columns: auto 1fr auto;
    gap: 14px;
    align-items: center;
    padding: 16px 18px;
    border: 1px solid rgba(37, 48, 62, 0.1);
    border-radius: 20px;
    background: rgba(255, 255, 255, 0.72);
}

.merge-file-index {
    display: inline-grid;
    place-items: center;
    width: 52px;
    min-height: 52px;
    border-radius: 16px;
    background: rgba(28, 36, 48, 0.08);
    font-size: 0.98rem;
    font-weight: 800;
    color: var(--muted);
}

.merge-file-meta {
    display: grid;
    gap: 4px;
    min-width: 0;
}

.merge-file-name,
.merge-file-details {
    margin: 0;
}

.merge-file-name {
    font-size: 1rem;
    font-weight: 800;
    line-height: 1.5;
    word-break: break-word;
}

.merge-file-details {
    font-size: 0.9rem;
    line-height: 1.5;
    color: var(--muted);
}

.merge-file-actions {
    display: flex;
    flex-wrap: wrap;
    justify-content: flex-end;
    gap: 10px;
}

.mini-action {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 40px;
    padding: 0 14px;
    border: 0;
    border-radius: 999px;
    background: linear-gradient(135deg, var(--accent), #f08750);
    color: #fff;
    font: inherit;
    font-size: 0.88rem;
    font-weight: 800;
    cursor: pointer;
    box-shadow: 0 10px 22px rgba(217, 95, 67, 0.16);
}

.mini-action.secondary {
    background: rgba(28, 36, 48, 0.08);
    color: var(--text);
    box-shadow: none;
}

.mini-action:hover {
    transform: translateY(-1px);
}

.mini-action:disabled {
    cursor: not-allowed;
    opacity: 0.56;
    transform: none;
}

.results-panel {
    margin-top: 28px;
    padding-top: 22px;
    border-top: 1px solid rgba(37, 48, 62, 0.08);
}

.results-panel.is-hidden {
    display: none;
}

.results-summary {
    display: grid;
    gap: 10px;
    margin-bottom: 18px;
}

.results-actions {
    display: flex;
    justify-content: flex-start;
    flex-wrap: wrap;
    gap: 12px;
}

.results-meta {
    font-size: 0.95rem;
    color: var(--text);
    line-height: 1.6;
}

.results-warning {
    margin: 0;
    padding: 12px 14px;
    border-radius: 14px;
    background: rgba(217, 95, 67, 0.1);
    color: #8b3f2f;
    font-size: 0.93rem;
    line-height: 1.5;
}

.pages-grid {
    display: grid;
    gap: 16px;
}

.empty-state {
    padding: 20px 18px;
    border: 1px dashed rgba(37, 48, 62, 0.16);
    border-radius: 20px;
    background: rgba(255, 255, 255, 0.62);
    color: var(--muted);
    font-size: 0.95rem;
    line-height: 1.6;
}

.summary-action {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 46px;
    padding: 0 18px;
    border: 0;
    border-radius: 999px;
    background: linear-gradient(135deg, var(--accent), #f08750);
    color: #fff;
    font: inherit;
    font-size: 0.94rem;
    font-weight: 800;
    cursor: pointer;
    box-shadow: 0 14px 28px rgba(217, 95, 67, 0.2);
}

.summary-action.secondary {
    background: rgba(28, 36, 48, 0.08);
    color: var(--text);
    box-shadow: none;
}

.summary-action:hover {
    transform: translateY(-1px);
}

.summary-action:disabled {
    cursor: progress;
    opacity: 0.88;
}

.summary-action.is-loading {
    box-shadow: none;
}

.page-card {
    display: grid;
    grid-template-columns: minmax(120px, 160px) 1fr;
    gap: 16px;
    align-items: center;
    padding: 14px;
    border: 1px solid rgba(37, 48, 62, 0.1);
    border-radius: 22px;
    background: rgba(255, 255, 255, 0.72);
}

.page-preview {
    min-height: 160px;
    border-radius: 16px;
    overflow: hidden;
    background: linear-gradient(145deg, rgba(28, 36, 48, 0.06), rgba(28, 36, 48, 0.1));
    display: grid;
    place-items: center;
}

.page-preview-image {
    display: block;
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.page-preview-placeholder {
    padding: 18px;
    text-align: center;
    font-weight: 800;
    font-size: 0.95rem;
    color: var(--muted);
}

.page-card-body {
    display: grid;
    gap: 12px;
}

.page-card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
}

.page-card-header h2 {
    margin: 0;
    font-size: 1.08rem;
}

.page-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 62px;
    min-height: 32px;
    padding: 0 12px;
    border-radius: 999px;
    background: rgba(28, 36, 48, 0.08);
    font-size: 0.78rem;
    font-weight: 800;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--muted);
}

.page-source {
    margin: 0;
    font-size: 0.9rem;
    line-height: 1.5;
    color: var(--muted);
    word-break: break-word;
}

.page-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.page-action {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 42px;
    padding: 0 16px;
    border-radius: 999px;
    background: linear-gradient(135deg, var(--accent), #f08750);
    color: #fff;
    text-decoration: none;
    font-weight: 800;
    font-size: 0.92rem;
    box-shadow: 0 12px 24px rgba(217, 95, 67, 0.18);
}

.page-action.secondary {
    background: rgba(28, 36, 48, 0.08);
    color: var(--text);
    box-shadow: none;
}

.page-action:hover {
    transform: translateY(-1px);
}

.page-action.is-loading,
.page-action[aria-disabled="true"] {
    pointer-events: none;
    cursor: progress;
    opacity: 0.88;
}

.notes {
    display: grid;
    gap: 8px;
    margin-top: 22px;
    padding-top: 18px;
    border-top: 1px solid rgba(37, 48, 62, 0.08);
    color: var(--muted);
    font-size: 0.92rem;
    line-height: 1.6;
}

.notes p {
    margin: 0;
}

code {
    padding: 0.1rem 0.45rem;
    border-radius: 999px;
    background: rgba(28, 36, 48, 0.08);
    font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
    font-size: 0.9em;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

@media (max-width: 700px) {
    .card {
        padding: 26px 20px;
        border-radius: 22px;
    }

    .workspace-tabs {
        display: grid;
        grid-template-columns: 1fr;
        border-radius: 22px;
    }

    .submit-button {
        width: 100%;
    }

    .target-size-fields {
        grid-template-columns: 1fr;
    }

    .merge-actions {
        flex-direction: column;
    }

    .merge-actions .submit-button,
    .merge-actions .summary-action {
        width: 100%;
    }

    .page-card {
        grid-template-columns: 1fr;
    }

    .merge-file-item {
        grid-template-columns: 1fr;
        justify-items: flex-start;
    }

    .merge-file-index {
        width: auto;
        min-width: 64px;
    }

    .merge-file-actions {
        width: 100%;
        justify-content: stretch;
    }

    .mini-action {
        flex: 1 1 100%;
        width: 100%;
    }

    .page-preview {
        min-height: 220px;
    }

    .page-actions {
        flex-direction: column;
    }

    .page-action {
        width: 100%;
    }
}