:root {
    color-scheme: light;
    --bg: #f4f7fb;
    --surface: #ffffff;
    --border: #d9e2f0;
    --text: #172133;
    --muted: #61708a;
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --success: #d1fae5;
    --success-text: #065f46;
}

* { box-sizing: border-box; }
body {
    margin: 0;
    font-family: "Segoe UI", sans-serif;
    background: radial-gradient(circle at top right, #eaf4ff 0%, #f4f7fb 55%);
    color: var(--text);
}

.app-header {
    display: flex;
    justify-content: space-between;
    gap: 2rem;
    padding: 2rem 3rem;
    background: linear-gradient(135deg, #0f172a, #1d4ed8);
    color: #fff;
}

.eyebrow { text-transform: uppercase; letter-spacing: .08em; font-size: .75rem; opacity: .8; }
.subtitle { max-width: 46rem; color: rgba(255,255,255,.85); }
.account-box { align-self: center; display: grid; gap: .75rem; justify-items: end; }
.signed-in { margin: 0; }
.page-shell { padding: 2rem 3rem 3rem; }
.card-grid { display: grid; grid-template-columns: minmax(320px, 1fr) minmax(480px, 1.3fr); gap: 1.5rem; align-items: start; }
.card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 20px;
    padding: 1.5rem;
    box-shadow: 0 12px 40px rgba(15, 23, 42, 0.08);
}
.card-header { display: flex; justify-content: space-between; gap: 1rem; align-items: start; }
.helper-text, .empty-state, .muted { color: var(--muted); }
.entry-form { display: grid; gap: .75rem; }
.entry-form input {
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: .85rem 1rem;
    font: inherit;
}
.button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border: 0;
    border-radius: 999px;
    padding: .85rem 1.2rem;
    background: var(--primary);
    color: #fff;
    text-decoration: none;
    cursor: pointer;
    font-weight: 600;
}
.button:hover { background: var(--primary-dark); }
.button.secondary { background: rgba(255,255,255,.16); border: 1px solid rgba(255,255,255,.28); }
.status-banner {
    margin-bottom: 1rem;
    background: var(--success);
    color: var(--success-text);
    border-radius: 12px;
    padding: .85rem 1rem;
}
.badge { background: #dbeafe; color: #1d4ed8; border-radius: 999px; padding: .4rem .75rem; font-weight: 700; }
.validation-summary, .field-validation { color: #b91c1c; }

.form-title-row { display: flex; justify-content: space-between; gap: 1rem; align-items: center; }
.food-illustration {
    font-size: 2rem;
    background: linear-gradient(120deg, #ecfccb, #fde68a);
    border: 1px solid #d9f99d;
    border-radius: 999px;
    padding: .3rem .8rem;
}

.calendar-grid {
    margin-top: 1rem;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: .8rem;
}

.calendar-day {
    border: 1px solid var(--border);
    border-radius: 14px;
    padding: .75rem;
    background: #fdfefe;
    min-height: 130px;
}

.calendar-day h3 {
    margin: 0 0 .5rem;
    font-size: 1rem;
}

.calendar-day h3 small {
    font-size: .75rem;
    color: var(--muted);
}

.entry-list {
    list-style: none;
    margin: 0;
    padding: 0;
    display: grid;
    gap: .4rem;
}

.entry-list li {
    border: 1px dashed #dbe5f4;
    border-radius: 10px;
    padding: .45rem .55rem;
    background: #fff;
}

.entry-main {
    display: flex;
    justify-content: space-between;
    gap: .5rem;
}

.entry-calorie {
    display: flex;
    align-items: center;
    gap: .4rem;
    margin-top: .25rem;
    font-size: .85rem;
}

.trend {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 1.3rem;
    height: 1.3rem;
    border-radius: 999px;
    font-weight: 700;
}

.trend-over { background: #fee2e2; color: #b91c1c; }
.trend-under { background: #dcfce7; color: #15803d; }
.trend-equal { background: #e0e7ff; color: #3730a3; }

@media (max-width: 980px) {
    .card-grid { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
    .app-header, .page-shell { padding: 1.25rem; }
    .app-header { flex-direction: column; }
    .account-box { justify-items: start; }
}

.kv {
    display: grid;
    grid-template-columns: 220px 1fr;
    gap: .5rem 1rem;
    margin: 0;
}

.kv dt {
    font-weight: 700;
    color: var(--muted);
}

.kv dd {
    margin: 0;
    word-break: break-word;
}

code {
    background: #f3f4f6;
    padding: .1rem .4rem;
    border-radius: 6px;
}

.login-card {
    max-width: 560px;
}