:root {
    color-scheme: light;
    --accent: #c41230;
    --accent-dark: #9f0f27;
    --bg: #f6f7f9;
    --border: #d9dee7;
    --ink: #1d232d;
    --muted: #687280;
    --surface: #ffffff;
    --toolbar-height: 96px;
}

* {
    box-sizing: border-box;
}

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

body {
    margin: 0;
    background: var(--bg);
    color: var(--ink);
    font-family: Arial, Helvetica, sans-serif;
    line-height: 1.4;
}

a {
    color: inherit;
}

.hub {
    min-height: 100vh;
    display: grid;
    place-items: center;
    padding: 40px 18px;
}

.hub-inner {
    width: min(100%, 900px);
}

.hub h1 {
    margin: 0 0 28px;
    font-size: clamp(2.1rem, 7vw, 4.6rem);
    font-weight: 800;
    letter-spacing: 0;
    line-height: 1;
    text-align: center;
}

.tool-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 14px;
}

.tool-card {
    min-height: 148px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 8px;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: var(--surface);
    box-shadow: 0 18px 48px rgba(29, 35, 45, 0.08);
    padding: 22px;
    text-align: left;
    text-decoration: none;
}

.tool-card:hover,
.tool-card:focus {
    border-color: rgba(196, 18, 48, 0.45);
    box-shadow: 0 20px 54px rgba(29, 35, 45, 0.12);
    outline: 0;
}

.tool-card strong {
    display: block;
    font-size: 1.28rem;
    line-height: 1.1;
}

.tool-card span {
    color: var(--muted);
    font-size: 0.94rem;
    line-height: 1.35;
}

.tool-page {
    min-height: 100vh;
    padding: 26px;
}

.tool-header {
    width: min(100%, 1120px);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    margin: 0 auto 22px;
}

.tool-header h1 {
    margin: 0;
    font-size: clamp(1.8rem, 4vw, 3rem);
    font-weight: 800;
    letter-spacing: 0;
    line-height: 1;
}

.back-link {
    flex: 0 0 auto;
    border: 1px solid var(--border);
    border-radius: 6px;
    background: var(--surface);
    color: var(--muted);
    font-weight: 700;
    padding: 10px 12px;
    text-decoration: none;
}

.back-link:hover,
.back-link:focus {
    border-color: var(--accent);
    color: var(--ink);
    outline: 0;
}

.workspace {
    width: min(100%, 1120px);
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 14px;
    margin: 0 auto;
}

.panel {
    border: 1px solid var(--border);
    border-radius: 8px;
    background: var(--surface);
    box-shadow: 0 18px 48px rgba(29, 35, 45, 0.08);
    padding: 18px;
}

.panel label,
.field label {
    display: block;
    margin: 0 0 7px;
    color: var(--muted);
    font-size: 0.82rem;
    font-weight: 700;
}

textarea,
input,
select {
    width: 100%;
    border: 1px solid var(--border);
    border-radius: 6px;
    background: #fff;
    color: var(--ink);
    font: inherit;
}

textarea {
    min-height: 380px;
    resize: vertical;
    padding: 12px;
}

input,
select {
    height: 40px;
    padding: 0 10px;
}

textarea:focus,
input:focus,
select:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(196, 18, 48, 0.14);
    outline: 0;
}

.output {
    background: #fbfcfd;
}

.actions {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 12px;
}

button,
.button {
    min-width: 0;
    min-height: 40px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border: 0;
    border-radius: 6px;
    cursor: pointer;
    font: inherit;
    font-weight: 700;
    text-align: center;
    text-decoration: none;
    white-space: nowrap;
    padding: 0 14px;
}

button {
    background: var(--accent);
    color: #fff;
}

button:hover,
button:focus {
    background: var(--accent-dark);
}

.button {
    background: #252d39;
    color: #fff;
}

.button:hover,
.button:focus {
    background: #111821;
}

.button[hidden],
.is-hidden {
    display: none;
}

.meta {
    min-height: 22px;
    margin: 12px 0 0;
    color: var(--muted);
    font-size: 0.92rem;
}

.sum-output {
    min-height: 120px;
    display: grid;
    place-items: center;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: #fbfcfd;
    padding: 18px;
}

.sum-value {
    font-size: clamp(2.1rem, 8vw, 5.2rem);
    font-weight: 800;
    letter-spacing: 0;
    line-height: 1;
    text-align: center;
    word-break: break-word;
}

body.image-tool {
    width: 100%;
    height: 100%;
    overflow: hidden;
}

.image-stage {
    position: fixed;
    inset: 0 0 var(--toolbar-height);
    display: grid;
    place-items: center;
    padding: 24px;
}

.preview-frame {
    --preview-scale: 1;
    position: relative;
    display: none;
    max-width: 100%;
    max-height: 100%;
}

.preview-frame.is-visible {
    display: block;
}

.preview-frame .canvas-container {
    position: absolute !important;
    top: 50%;
    left: 50%;
    margin: 0 !important;
    transform: translate(-50%, -50%) scale(var(--preview-scale));
    transform-origin: center;
}

.empty-state {
    max-width: 560px;
    color: var(--muted);
    font-size: 1.15rem;
    line-height: 1.55;
    text-align: center;
}

.creator-bar {
    position: fixed;
    right: 0;
    bottom: 0;
    left: 0;
    z-index: 10;
    border-top: 1px solid var(--border);
    background: rgba(255, 255, 255, 0.96);
    box-shadow: 0 -16px 42px rgba(29, 35, 45, 0.08);
    padding: 16px;
}

.bar-inner {
    width: min(100%, 1120px);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 14px;
    margin: 0 auto;
}

.bar-inner h1 {
    flex: 0 0 auto;
    margin: 0;
    font-size: 1.45rem;
    font-weight: 800;
    letter-spacing: 0;
    line-height: 1.1;
    white-space: nowrap;
}

.creator-form {
    flex: 1 1 auto;
    display: grid;
    grid-template-columns: minmax(96px, 130px) minmax(96px, 130px) minmax(112px, 150px) minmax(110px, 140px) minmax(104px, 132px);
    align-items: end;
    gap: 10px;
    max-width: 720px;
}

.field {
    position: relative;
    min-width: 0;
}

.error {
    position: absolute;
    top: calc(100% + 4px);
    left: 0;
    display: block;
    color: #a51414;
    font-size: 0.72rem;
    line-height: 1.2;
    white-space: nowrap;
}

@media (max-width: 900px) {
    .tool-grid,
    .workspace {
        grid-template-columns: 1fr;
    }

    textarea {
        min-height: 260px;
    }
}

@media (max-width: 840px) {
    .bar-inner {
        flex-wrap: wrap;
        gap: 12px;
    }

    .bar-inner h1 {
        width: 100%;
        text-align: center;
    }

    .creator-form {
        width: 100%;
        grid-template-columns: repeat(5, minmax(0, 1fr));
        max-width: none;
    }
}

@media (max-width: 620px) {
    .tool-page {
        padding: 18px 12px;
    }

    .tool-header {
        align-items: flex-start;
        flex-direction: column-reverse;
    }

    .image-stage {
        padding: 14px;
    }

    .creator-bar {
        padding: 12px;
    }

    .creator-form {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .creator-form .field:nth-child(3),
    .creator-form button,
    .creator-form .button {
        grid-column: span 2;
    }
}