/* Cover page maker */

:root {
    --desk: #DCE4EE;
    --grid-line: #C9D5E3;
    --ink: #0F2347;
    --muted: #4B5E7E;
    --border: #B4C2D5;
    --highlight: #FFE85A;
    --preview-max-height: calc(100vh - 170px);
}

* {
    box-sizing: border-box;
}

html {
    -webkit-text-size-adjust: 100%;
}

body {
    margin: 0;
    color: var(--ink);
    font: 16px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    /* graph paper */
    background-color: var(--desk);
    background-image:
        linear-gradient(var(--grid-line) 1px, transparent 1px),
        linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
    background-size: 28px 28px;
}

:focus-visible {
    outline: 3px solid var(--ink);
    outline-offset: 2px;
}


/* ---------- header ---------- */

.site-header {
    max-width: 1180px;
    margin: 0 auto;
    padding: 26px 24px 18px;
}

h1 {
    margin: 0 0 6px;
    font: 700 34px/1.15 Georgia, "Times New Roman", serif;
    letter-spacing: -0.01em;
}

.site-header p {
    max-width: 60ch;
    margin: 0;
    color: var(--muted);
}

h2 {
    margin: 0;
    font: 700 21px/1.2 Georgia, "Times New Roman", serif;
}


/* ---------- layout ---------- */

.app {
    display: grid;
    grid-template-columns: minmax(300px, 470px) minmax(0, 1fr);
    gap: 32px;
    align-items: start;
    max-width: 1180px;
    margin: 0 auto;
    padding: 0 24px 64px;
}

.stage {
    position: sticky;
    top: 18px;
}

.sheet {
    display: flex;
    justify-content: center;
}

#preview {
    display: block;
    width: auto;
    height: auto;
    max-width: 100%;
    max-height: var(--preview-max-height);
    background: #fff;
    box-shadow: 0 1px 2px rgba(15, 35, 71, 0.25), 0 14px 30px -10px rgba(15, 35, 71, 0.45);
}

.download-bar {
    display: flex;
    gap: 10px;
    align-items: center;
    margin-top: 16px;
}

.download-bar select {
    flex: 1;
    min-width: 0;
    padding: 9px 4px 9px 9px;
    font-size: 15px;
}

.panel {
    padding: 22px 24px 26px;
    background: #fff;
    border: 1px solid var(--border);
    border-radius: 14px;
}

.heading-row {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    margin: 0 0 12px;
}

.details-heading {
    margin-top: 30px;
    padding-top: 22px;
    border-top: 1px solid var(--border);
}


/* ---------- design picker ---------- */

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(92px, 1fr));
    gap: 12px 10px;
}

.design {
    all: unset;
    box-sizing: border-box;
    display: block;
    align-self: start;
    padding: 4px 4px 6px;
    text-align: center;
    cursor: pointer;
    border-radius: 6px;
}

.design canvas {
    display: block;
    width: 100%;
    height: auto;
    aspect-ratio: var(--ratio, 2 / 3);
    background: #fff;
    box-shadow: 0 0 0 1px var(--border);
}

.design span {
    display: inline-block;
    margin-top: 6px;
    padding: 0 3px;
    font-size: 12.5px;
    line-height: 1.25;
    color: var(--muted);
}

.design:hover canvas,
.design[aria-pressed="true"] canvas {
    box-shadow: 0 0 0 2px var(--ink);
}

.design[aria-pressed="true"] {
    background: var(--highlight);
}

.design[aria-pressed="true"] span {
    color: var(--ink);
    font-weight: 600;
}


/* ---------- form ---------- */

label,
.label {
    display: block;
    margin: 0 0 4px;
    font-size: 13.5px;
    font-weight: 600;
}

input[type="text"],
textarea,
select {
    width: 100%;
    padding: 9px 11px;
    font: inherit;
    color: var(--ink);
    background: #fff;
    border: 1.5px solid var(--border);
    border-radius: 8px;
}

textarea {
    resize: vertical;
    line-height: 1.4;
}

input[type="text"]:focus,
textarea:focus,
select:focus {
    outline: none;
    border-color: var(--ink);
    box-shadow: 0 0 0 3px var(--highlight);
}

.field {
    margin-bottom: 14px;
}

.two-columns {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 14px;
}

.hint {
    margin: 4px 0 0;
    font-size: 12.5px;
    color: var(--muted);
}

details {
    margin-top: 2px;
}

summary {
    padding: 4px 0;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
}

details .two-columns {
    margin-top: 10px;
}

#message {
    min-height: 1.3em;
    margin: 6px 0 0;
    font-size: 13px;
    color: #9A2A1F;
}


/* ---------- buttons ---------- */

.btn {
    display: inline-block;
    padding: 9px 14px;
    font: inherit;
    font-weight: 600;
    line-height: 1.3;
    color: var(--ink);
    background: #fff;
    border: 1.5px solid var(--ink);
    border-radius: 8px;
    cursor: pointer;
}

.btn:hover {
    background: #F1F5FA;
}

.btn.primary {
    padding: 11px 18px;
    font-size: 16px;
    white-space: nowrap;
    background: var(--highlight);
}

.btn.primary:hover {
    background: #FFEE85;
}

.text-button {
    all: unset;
    padding: 2px 4px;
    font-weight: 600;
    cursor: pointer;
    border-radius: 4px;
    text-decoration: underline;
    text-decoration-color: var(--highlight);
    text-decoration-thickness: 2px;
    text-underline-offset: 3px;
}

.text-button:focus-visible {
    outline: 3px solid var(--ink);
}

.file-row {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    align-items: center;
}

/* hide the real file input but keep it focusable */
.file-row input[type="file"] {
    position: absolute;
    width: 1px;
    height: 1px;
    opacity: 0;
    pointer-events: none;
}

.file-row input:focus-visible + .btn {
    outline: 3px solid var(--ink);
    outline-offset: 2px;
}


/* ---------- phones ---------- */

@media (max-width: 900px) {
    :root {
        --preview-max-height: calc(44vh - 20px);
    }

    .site-header {
        padding: 14px 16px 8px;
    }

    h1 {
        font-size: 24px;
    }

    .site-header p {
        font-size: 14px;
    }

    .app {
        display: block;
        padding: 0 0 96px;
    }

    /* preview stays pinned to the top while the form scrolls underneath */
    .stage {
        top: 0;
        z-index: 5;
        padding: 10px 12px;
        border-bottom: 1px solid var(--border);
        background-color: var(--desk);
        background-image:
            linear-gradient(var(--grid-line) 1px, transparent 1px),
            linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
        background-size: 28px 28px;
    }

    /* download button is always reachable at the bottom of the screen */
    .download-bar {
        position: fixed;
        left: 0;
        right: 0;
        bottom: 0;
        z-index: 9;
        margin: 0;
        padding: 10px 14px calc(10px + env(safe-area-inset-bottom));
        background: #fff;
        border-top: 1px solid var(--border);
    }

    .panel {
        margin-top: 12px;
        padding: 18px 16px 22px;
        border-left: 0;
        border-right: 0;
        border-radius: 0;
    }

    .grid {
        grid-template-columns: repeat(4, 1fr);
        gap: 10px 6px;
    }

    .design span {
        font-size: 11.5px;
    }
}

@media (max-width: 420px) {
    .two-columns {
        grid-template-columns: 1fr;
    }
}

@media (prefers-reduced-motion: no-preference) {
    .design canvas {
        transition: box-shadow 0.12s;
    }
}