:root {
    /* Samus palette */
    --samus-pink: #d72f7a;
    --samus-pink-dark: #b21f64;
    --samus-green: #97c32f;
    --samus-yellow: #fdde38;

    --bg-page: #f5f6fa;
    --bg-card: #ffffff;
    --border-subtle: #e4e4e7;
    --text-main: #18181b;
    --text-muted: #6b7280;

    --radius-card: 8px;
    --radius-pill: 999px;
    --shadow-soft: 0 8px 20px rgba(15, 23, 42, 0.07);

    --font-sans: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
        sans-serif;
}

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

body {
    margin: 0;
    min-height: 100vh;
    font-family: var(--font-sans);
    /* a bit bigger for 4K */
    font-size: 19px;
    line-height: 1.4;
    background-color: var(--bg-page);
    color: var(--text-main);
    display: flex;
    justify-content: center;
}

.app-shell {
    width: 100%;
    max-width: 1040px;
    margin: 32px auto 40px;
    padding: 0 24px;
    display: flex;
    flex-direction: column;
    gap: 18px;
}

/* Header */

header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background-color: #ffffff;
    border-radius: var(--radius-card);
    border: 1px solid var(--border-subtle);
    padding: 10px 18px;
    box-shadow: var(--shadow-soft);
}

/* logo + title act as links back to home */

a.brand,
a.header-title {
    text-decoration: none;
    color: inherit;
}

.brand {
    display: flex;
    align-items: center;
}

.brand-mark {
    height: 48px;
    width: auto;
    display: block;
}

.header-title {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--text-main);
}

/* Layout */

main {
    display: grid;
    grid-template-columns: minmax(0, 2fr) minmax(0, 1.3fr);
    gap: 16px;
}

/* Generic “card” used on CPO page */

.card {
    background-color: var(--bg-card);
    border-radius: var(--radius-card);
    border: 1px solid var(--border-subtle);
    box-shadow: var(--shadow-soft);
    padding: 16px 18px 14px;
}

.card-inner {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.card-header h2 {
    margin: 0 0 4px;
    font-size: 1.15rem;
}

.card-header p {
    margin: 0;
    font-size: 0.88rem;
    color: var(--text-muted);
}

/* Home page panel (no card-in-card) */

.tools-panel {
    grid-column: 1 / -1; /* span full width of main */
    background-color: var(--bg-card);
    border-radius: var(--radius-card);
    border: 1px solid var(--border-subtle);
    box-shadow: var(--shadow-soft);
    padding: 16px 18px 14px;
}

.tools-panel-header {
    margin-bottom: 8px;
}

.tools-panel-header h2 {
    margin: 0;
    font-size: 1.15rem;
}

/* Tool cards (buttons) */

.tool-grid {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-top: 4px;
}

.tool-card {
    display: block;
    width: 100%;
    border-radius: var(--radius-card);
    border: 1px solid var(--border-subtle);
    background-color: #ffffff;
    padding: 12px 14px;
    text-decoration: none;
    transition:
        background-color 120ms ease-out,
        border-color 120ms ease-out,
        transform 120ms ease-out;
    color: var(--text-main);
    cursor: pointer;
}

.tool-card:hover {
    background-color: #fff7fb;
    border-color: var(--samus-pink);
    transform: translateY(-1px);
}

.tool-card-main {
    font-size: 1rem;
    font-weight: 600;
    color: var(--samus-pink);
}

.tool-card-sub {
    margin-top: 2px;
    font-size: 0.88rem;
    color: var(--text-muted);
}

/* Alerts */

.alerts {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.alert {
    border-radius: 6px;
    padding: 6px 8px;
    font-size: 0.86rem;
    display: flex;
    align-items: flex-start;
    gap: 6px;
}

.alert-icon {
    font-size: 1rem;
    line-height: 1;
    margin-top: 1px;
}

.alert-success {
    background-color: #ecfdf3;
    border: 1px solid #bbf7d0;
}

.alert-warning {
    background-color: #fffbeb;
    border: 1px solid #facc15;
}

.alert-error {
    background-color: #fef2f2;
    border: 1px solid #fecaca;
}

/* Form (CPO page) */

.form-grid {
    display: grid;
    gap: 10px;
    margin-top: 6px;
}

.label-heading {
    font-size: 0.9rem;
    font-weight: 500;
    margin-bottom: 2px;
    color: var(--text-muted);
}

.dropzone-row {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.dropzone {
    border-radius: 6px;
    border: 1px dashed #d4d4d8;
    background-color: #fafafa;
    padding: 9px 10px;
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    transition:
        background-color 120ms ease-out,
        border-color 120ms ease-out,
        transform 120ms ease-out;
}

.dropzone:hover {
    background-color: #f3f4f6;
    border-color: var(--samus-pink);
    transform: translateY(-1px);
}

.dropzone.is-dragover {
    border-color: var(--samus-pink-dark);
    background-color: #fdf2f7;
}

.dropzone-icon {
    width: 24px;
    height: 24px;
    border-radius: 4px;
    background-color: #fee2e2;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.95rem;
}

.dropzone-text {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.dropzone-title {
    font-size: 0.9rem;
}

.file-name {
    font-size: 0.82rem;
    color: var(--text-muted);
}

input[type="file"] {
    display: none;
}

/* Side info */

.side-info-heading {
    font-size: 0.98rem;
    margin: 0 0 4px;
}

.side-info-p {
    margin: 0;
    font-size: 0.88rem;
    color: var(--text-muted);
}

.meta-list {
    list-style: none;
    padding: 0;
    margin: 6px 0 0;
    font-size: 0.84rem;
    color: var(--text-muted);
}

.meta-list li {
    margin-bottom: 3px;
}

/* Actions / button */

.actions {
    margin-top: 12px;
    display: flex;
    align-items: center;
    justify-content: flex-start;
}

button[type="submit"] {
    border: none;
    border-radius: var(--radius-pill);
    padding: 10px 28px;
    font-size: 0.96rem;
    font-weight: 600;
    color: #ffffff;
    background-color: var(--samus-pink);
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    transition:
        background-color 120ms ease-out,
        box-shadow 120ms ease-out,
        transform 120ms ease-out,
        opacity 120ms ease-out;
    box-shadow: 0 8px 18px rgba(215, 47, 122, 0.25);
}

button[type="submit"]:hover:not(:disabled) {
    background-color: var(--samus-pink-dark);
    box-shadow: 0 10px 22px rgba(215, 47, 122, 0.35);
    transform: translateY(-1px);
}

button[type="submit"]:active:not(:disabled) {
    transform: translateY(0);
    box-shadow: 0 6px 14px rgba(215, 47, 122, 0.3);
}

button[type="submit"]:disabled {
    opacity: 0.65;
    cursor: default;
    box-shadow: none;
}

.btn-spinner {
    width: 14px;
    height: 14px;
    border-radius: 999px;
    border: 2px solid rgba(248, 250, 252, 0.4);
    border-top-color: #ffffff;
    animation: spin 700ms linear infinite;
    display: none;
}

button.is-loading .btn-spinner {
    display: inline-block;
}

button.is-loading .btn-label {
    opacity: 0.9;
}

/* Responsive */

@media (max-width: 900px) {
    .app-shell {
        margin-top: 20px;
        padding: 0 16px;
    }

    main {
        grid-template-columns: minmax(0, 1fr);
    }

    .tools-panel {
        grid-column: 1 / 2;
    }
}

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