:root {
    --bg: #F1F5F9;
    --card-bg: #FFFFFF;
    --header-bg: #0F172A;
    --header-accent: #38BDF8;
    --accent: #0EA5E9;
    --accent-hover: #0284C7;
    --green: #10B981;
    --green-hover: #059669;
    --indigo: #4F46E5;
    --indigo-hover: #4338CA;
    --text: #1E293B;
    --text-muted: #64748B;
    --border: #E2E8F0;
}

* {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

a {
    text-decoration: none;
    color: inherit;
}

li { list-style: none; }

body {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    background-color: var(--bg);
    color: var(--text);
}

/* ── Header ── */
header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: var(--header-bg);
    color: white;
    padding: 36px 20px;
    text-align: center;
}

.header-inner {
    max-width: 800px;
    margin: 0 auto;
}

.title {
    font-size: 1.9rem;
    font-weight: 800;
    letter-spacing: 0.06em;
    color: var(--header-accent);
}

.subtitle {
    font-size: 0.95rem;
    color: #94A3B8;
    margin-top: 6px;
    font-weight: 400;
}

/* ── Main ── */
main {
    flex: 1;
    max-width: 920px;
    width: 100%;
    margin: 0 auto;
    padding: 40px 20px;
    display: flex;
    flex-direction: column;
    gap: 40px;
}

.section-title {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 16px;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--border);
}

/* ── Steps ── */
.steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 10px;
    align-items: stretch;
}

.step {
    display: flex;
    align-items: center;
    gap: 14px;
    background: white;
    border-radius: 10px;
    padding: 14px 16px;
    border: 1px solid var(--border);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.06);
}

.step-number {
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 28px;
    height: 28px;
    background: var(--accent);
    color: white;
    font-weight: 700;
    font-size: 0.82rem;
    border-radius: 50%;
    flex-shrink: 0;
    align-self: center;
}

.step-content {
    font-size: 0.88rem;
    color: var(--text);
    line-height: 1.55;
    padding-top: 4px;
}

.step-content strong {
    color: var(--accent);
}

.step-content em {
    color: var(--text-muted);
    font-style: normal;
    font-size: 0.81rem;
}

/* ── Action Cards ── */
.actions {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
}

.card {
    background: white;
    border-radius: 14px;
    padding: 28px 24px;
    border: 1px solid var(--border);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.07);
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 10px;
}

.card-badge {
    display: inline-block;
    padding: 4px 12px;
    border-radius: 999px;
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    margin-bottom: 2px;
}

.card-badge.download { background: #DCFCE7; color: #166534; }
.card-badge.upload   { background: #E0F2FE; color: #075985; }

.card-title {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text);
}

.card-desc {
    font-size: 0.85rem;
    color: var(--text-muted);
    line-height: 1.5;
    min-height: calc(1.5em * 3);
}

/* ── Form ── */
form {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    width: 100%;
}

/* ── Buttons ── */
.btn {
    display: inline-block;
    width: 100%;
    padding: 11px 24px;
    border-radius: 8px;
    font-size: 0.93rem;
    font-weight: 600;
    cursor: pointer;
    border: none;
    text-align: center;
    transition: background 0.18s ease, transform 0.15s ease, box-shadow 0.15s ease;
    letter-spacing: 0.03em;
}

.btn-download {
    background: var(--green);
    color: white;
}

.btn-download:hover {
    background: var(--green-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 14px rgba(16, 185, 129, 0.28);
}

.btn-upload {
    background: var(--accent);
    color: white;
}

.btn-upload:hover {
    background: var(--accent-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 14px rgba(14, 165, 233, 0.28);
}

.btn-submit {
    background: var(--indigo);
    color: white;
}

.btn-submit:hover:not(:disabled) {
    background: var(--indigo-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 14px rgba(79, 70, 229, 0.28);
}

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

.file-hidden { display: none; }

.file-info {
    font-size: 0.8rem;
    color: var(--text-muted);
    width: 100%;
    padding: 5px 10px;
    background: var(--bg);
    border-radius: 6px;
    text-align: center;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    border: 1px solid var(--border);
    transition: color 0.15s;
}

.file-info.has-file {
    color: var(--indigo);
    font-weight: 600;
    border-color: #C7D2FE;
    background: #EEF2FF;
}

/* ── Divider ── */
.card-divider {
    width: 100%;
    height: 1px;
    background: var(--border);
    margin: 2px 0;
}

/* ── Disclaimer ── */
.disclaimer {
    border-top: 1px solid var(--border);
    padding: 20px;
    text-align: center;
    font-size: 0.77rem;
    color: var(--text-muted);
    line-height: 1.65;
    display: flex;
    flex-direction: column;
    gap: 4px;
    background: white;
}

.disclaimer strong { color: var(--text); }

/* ── Footer ── */
footer {
    background: var(--header-bg);
    color: #64748B;
    text-align: center;
    padding: 18px;
    font-size: 0.8rem;
}