:root {
    --green: rgb(42,199,89);
    --orange: rgb(255, 141, 40);
    --red: rgb(255, 56, 60);
    --grey: rgb(142, 142, 147);

    --card: #ffffff;
    --text: rgb(28, 28, 30);
    --bg: #ffffff;

    --header-bg: #ffffff; /* solid */
    --border: rgba(0,0,0,0.05);

    --radius: 14px;
    --shadow: 0 4px 12px rgba(0,0,0,0.08);
    --transition: 0.2s ease;
}

@media (prefers-color-scheme: dark) {
    :root {
        --card: #1e293b;
        --text: #f1f5f9;
        --bg: #0f172a;

        --header-bg: #0f172a; /* solid */
        --border: rgba(255,255,255,0.05);
    }
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    padding: 2px 20px 16px;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;

    background-color: var(--bg);
    color: var(--text);
}

body.loading {
    opacity: 0;
}

.progress-fill {
    transition: width 0.3s ease;
}

.app-header {
    position: sticky;
    top: 0;
    z-index: 999;

    text-align: center;
    padding: 16px 20px;

    background: var(--header-bg); /* now solid */
    border-bottom: 1px solid var(--border);
}

.header-title {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    margin-bottom: 8px;
}

.logo {
    width: 28px;
    height: 28px;
    object-fit: contain;

    display: block; /* 👈 IMPORTANT */
    transform: translateY(0px);
}

.app-title {
    margin: 0;
    font-size: 34px;
    font-weight: 700;
    color: var(--green);
    letter-spacing: -0.5px;

    line-height: 1; /* 👈 IMPORTANT */
}

.btn {
    background: var(--card);
    color: var(--text);
    border: none;
    padding: 8px 14px;
    border-radius: 10px;
    cursor: pointer;
    transition: var(--transition);
}

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

.progress-track {
    width: 100%;
    height: 8px;
    background: rgba(0,0,0,0.1);
    border-radius: 999px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, var(--green), #16a34a);
    transition: width 0.4s ease;
}

.heatmaps {
    display: grid;
    gap: 24px;
    max-width: 600px;
    margin: 0 auto;
}

.heatmap h3 {
    margin-bottom: 8px;
    font-size: 18px;
}

.grid {
    display: grid;
    grid-template-columns: repeat(14, 1fr);
    gap: 4px;
}

.cell {
    width: 100%;
    aspect-ratio: 1;
    border-radius: 3px;
    background: #e5e7eb;

    opacity: 0;
    transform: scale(0.6);

    transition: all 0.25s ease;
}

.cell.show {
    opacity: 1;
    transform: scale(1);
}

.c0 { background: var(--grey); }
.c1 { background: var(--red); }
.c2 { background: var(--orange); }
.c3 { background: var(--green); }