/* PawBay — clean light design system (devbay family) */
:root {
    --bg: #f8fafc;
    --bg-soft: #f1f5f9;
    --text: #0f172a;
    --text-dim: #64748b;
    --text-faint: #94a3b8;
    --card: #ffffff;
    --card-strong: #f8fafc;
    --border: #e2e8f0;
    --border-strong: #cbd5e1;
    --accent-1: #6366f1;
    --accent-2: #4f46e5;
    --accent-3: #818cf8;
    --accent-soft: rgba(99, 102, 241, 0.08);
    --good: #10b981;
    --good-soft: rgba(16, 185, 129, 0.1);
    --warn: #d97706;
    --warn-soft: rgba(245, 158, 11, 0.12);
    --danger: #dc2626;
    --danger-soft: rgba(220, 38, 38, 0.08);
    --radius: 0.625rem;
    --shadow: 0 1px 2px 0 rgba(15, 23, 42, 0.04);
    --shadow-hover: 0 4px 12px 0 rgba(15, 23, 42, 0.08);
    --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC",
            "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
}

[data-theme="dark"] {
    --bg: #0f172a;
    --bg-soft: #1e293b;
    --text: #f1f5f9;
    --text-dim: #94a3b8;
    --text-faint: #64748b;
    --card: #1e293b;
    --card-strong: #0f172a;
    --border: #334155;
    --border-strong: #475569;
    --accent-1: #818cf8;
    --accent-2: #a5b4fc;
    --accent-3: #6366f1;
    --accent-soft: rgba(129, 140, 248, 0.14);
    --good: #34d399;
    --good-soft: rgba(52, 211, 153, 0.12);
    --warn: #fbbf24;
    --warn-soft: rgba(251, 191, 36, 0.12);
    --danger: #f87171;
    --danger-soft: rgba(248, 113, 113, 0.1);
    --shadow: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
    --shadow-hover: 0 4px 12px 0 rgba(0, 0, 0, 0.4);
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
    font-family: var(--font);
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    line-height: 1.6;
    transition: background 0.3s ease, color 0.3s ease;
}

.container { width: min(1100px, 92vw); margin: 0 auto; }

/* ---------- header ---------- */
.site-header {
    position: sticky; top: 0; z-index: 50;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
}
.nav { display: flex; align-items: center; justify-content: space-between; height: 64px; gap: 16px; }
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; color: var(--text); }
.brand-logo { display: flex; }
.brand-name { font-size: 1.25rem; font-weight: 800; letter-spacing: -0.02em; }
.brand-accent { color: var(--accent-1); }
.nav-links { display: flex; align-items: center; gap: 4px; }
.nav-link {
    position: relative;
    padding: 6px 12px; border-radius: 0.5rem;
    color: var(--text-dim); text-decoration: none;
    font-size: 0.9rem; font-weight: 600; transition: all 0.15s ease;
}
.nav-link:hover { color: var(--text); background: var(--bg-soft); }
.nav-link.active { color: var(--accent-1); background: var(--accent-soft); }
.nav-badge {
    position: absolute; top: -4px; right: -4px;
    min-width: 17px; height: 17px; padding: 0 4px;
    border-radius: 999px; background: var(--danger); color: #fff;
    font-size: 0.68rem; font-weight: 700; line-height: 17px; text-align: center;
}
.nav-right { display: flex; align-items: center; gap: 10px; }
.icon-btn {
    display: flex; align-items: center; justify-content: center;
    width: 38px; height: 38px; border-radius: 0.5rem;
    background: var(--card); border: 1px solid var(--border);
    color: var(--text-dim); cursor: pointer; transition: all 0.15s ease;
    font-family: inherit;
}
.icon-btn:hover { color: var(--text); border-color: var(--border-strong); background: var(--card-strong); }
.icon-moon { display: none; }
[data-theme="light"] .icon-sun { display: none; }
[data-theme="light"] .icon-moon { display: block; }

.lang-select {
    appearance: none; -webkit-appearance: none;
    background: var(--card); border: 1px solid var(--border);
    border-radius: 0.5rem; color: var(--text-dim);
    font-family: inherit; font-size: 0.8rem; font-weight: 600;
    padding: 8px 28px 8px 12px; cursor: pointer; transition: all 0.15s ease;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6' viewBox='0 0 10 6'%3E%3Cpath d='M1 1l4 4 4-4' stroke='%2394a3b8' stroke-width='1.5' fill='none' stroke-linecap='round'/%3E%3C/svg%3E");
    background-repeat: no-repeat; background-position: right 10px center;
}
.lang-select:hover { color: var(--text); border-color: var(--border-strong); }

/* ---------- hero / home ---------- */
.hero { text-align: center; padding: 64px 0 40px; }
.hero-title {
    font-size: clamp(2.2rem, 5.5vw, 3.4rem);
    font-weight: 900; letter-spacing: -0.03em; line-height: 1.15;
}
.hero-sub { max-width: 640px; margin: 18px auto 0; color: var(--text-dim); font-size: 1.05rem; }

.tool-grid {
    display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 16px; padding: 16px 0 48px;
}
.section-label { margin-top: 8px; font-size: 0.8rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.08em; color: var(--text-faint); }
.tool-card {
    display: flex; flex-direction: column; gap: 6px;
    background: var(--card); border: 1px solid var(--border);
    border-radius: var(--radius); padding: 22px 20px;
    text-decoration: none; color: var(--text);
    box-shadow: var(--shadow);
    transition: border-color 0.15s ease, box-shadow 0.15s ease, transform 0.15s ease;
}
.tool-card:hover { border-color: var(--accent-3); box-shadow: var(--shadow-hover); transform: translateY(-2px); }
.tool-card svg { color: var(--accent-1); }
.tool-card h3 { font-size: 1.05rem; font-weight: 700; }
.tool-card p { font-size: 0.9rem; color: var(--text-dim); }

.why-grid {
    display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 16px; padding: 16px 0 64px;
}
.why-item {
    background: var(--card); border: 1px solid var(--border);
    border-radius: var(--radius); padding: 18px 20px;
}
.why-item h4 { font-size: 0.95rem; font-weight: 700; margin-bottom: 4px; }
.why-item p { font-size: 0.85rem; color: var(--text-dim); }

/* ---------- page head ---------- */
.page-head { padding: 40px 0 20px; }
.page-head h1 { font-size: clamp(1.6rem, 4vw, 2.2rem); font-weight: 800; letter-spacing: -0.02em; }
.page-sub { color: var(--text-dim); margin-top: 6px; }

/* ---------- cards & forms ---------- */
.card {
    background: var(--card); border: 1px solid var(--border);
    border-radius: var(--radius); padding: 24px;
    box-shadow: var(--shadow); margin-bottom: 20px;
}
.card-title { font-size: 1.1rem; font-weight: 800; margin-bottom: 14px; }
.form-card { margin-bottom: 20px; }
.form-row {
    display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 16px; margin-bottom: 16px; align-items: end;
}
.form-row:last-child { margin-bottom: 0; }
.field { display: flex; flex-direction: column; gap: 6px; }
.field-label { font-size: 0.8rem; font-weight: 600; color: var(--text-dim); }
.field-hint { font-size: 0.75rem; color: var(--text-faint); }

.input {
    width: 100%;
    background: var(--card); border: 1px solid var(--border);
    border-radius: 0.5rem; padding: 9px 12px;
    font-family: inherit; font-size: 0.95rem; color: var(--text);
    transition: border-color 0.15s ease, box-shadow 0.15s ease;
}
.input:focus { outline: none; border-color: var(--accent-1); box-shadow: 0 0 0 3px var(--accent-soft); }
select.input { cursor: pointer; }

.seg { display: inline-flex; background: var(--bg-soft); border: 1px solid var(--border); border-radius: 0.5rem; padding: 3px; gap: 3px; }
.seg-btn {
    border: none; background: transparent; border-radius: 0.375rem;
    padding: 7px 14px; font-family: inherit; font-size: 0.9rem; font-weight: 600;
    color: var(--text-dim); cursor: pointer; transition: all 0.15s ease;
}
.seg-btn:hover { color: var(--text); }
.seg-btn.active { background: var(--card); color: var(--accent-1); box-shadow: var(--shadow); }

.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chip {
    border: 1px solid var(--border); background: var(--card);
    border-radius: 999px; padding: 6px 14px;
    font-family: inherit; font-size: 0.85rem; font-weight: 600; color: var(--text-dim);
    cursor: pointer; transition: all 0.15s ease;
}
.chip:hover { color: var(--accent-1); border-color: var(--accent-3); }

.age-inputs { display: flex; align-items: center; gap: 8px; }
.age-inputs .input { max-width: 90px; }
.unit-label { color: var(--text-dim); font-size: 0.9rem; white-space: nowrap; }
.density-wrap { display: flex; align-items: center; gap: 8px; }
.density-wrap .input { max-width: 140px; }

/* ---------- buttons ---------- */
.btn {
    border: 1px solid var(--border); background: var(--card);
    border-radius: 0.5rem; padding: 9px 18px;
    font-family: inherit; font-size: 0.9rem; font-weight: 600;
    color: var(--text-dim); cursor: pointer; transition: all 0.15s ease;
}
.btn:hover { color: var(--text); border-color: var(--border-strong); background: var(--card-strong); }
.btn-primary { background: var(--accent-2); border-color: var(--accent-2); color: #fff; }
.btn-primary:hover { background: var(--accent-1); border-color: var(--accent-1); color: #fff; }
.btn-sm { padding: 5px 12px; font-size: 0.8rem; border-radius: 0.375rem; }
.btn-danger { color: var(--danger); border-color: var(--border); }
.btn-danger:hover { color: var(--danger); border-color: var(--danger); background: var(--danger-soft); }
.form-actions { display: flex; gap: 10px; margin-top: 4px; }

/* ---------- results ---------- */
.result-area { margin-top: 20px; border-top: 1px solid var(--border); padding-top: 20px; }
.result-card {
    display: flex; align-items: baseline; gap: 8px; flex-wrap: wrap;
    background: var(--card-strong); border: 1px solid var(--border);
    border-radius: var(--radius); padding: 18px 20px;
}
.result-num { font-size: 2.1rem; font-weight: 900; letter-spacing: -0.03em; color: var(--accent-1); }
.result-unit { font-size: 1rem; font-weight: 600; color: var(--text-dim); }
.result-label { width: 100%; font-size: 0.8rem; font-weight: 600; color: var(--text-faint); text-transform: uppercase; letter-spacing: 0.05em; }
.result-side { display: flex; flex-direction: column; gap: 6px; margin-left: auto; text-align: right; }
.stage-desc { font-size: 0.85rem; color: var(--text-dim); }
.result-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 12px; }
.result-card-accent { background: var(--accent-soft); border-color: var(--accent-3); }
.result-card-accent .result-num { color: var(--accent-2); }

.note { font-size: 0.8rem; color: var(--text-faint); margin-top: 14px; line-height: 1.7; }

/* ---------- badges & notices ---------- */
.badge {
    display: inline-block; padding: 3px 10px; border-radius: 999px;
    font-size: 0.75rem; font-weight: 700; white-space: nowrap;
}
.badge-accent { background: var(--accent-soft); color: var(--accent-1); }
.badge-done, .badge-good { background: var(--good-soft); color: var(--good); }
.badge-overdue { background: var(--danger-soft); color: var(--danger); }
.badge-soon, .badge-warn { background: var(--warn-soft); color: var(--warn); }
.badge-upcoming { background: var(--bg-soft); color: var(--text-dim); }
.notice {
    border-radius: var(--radius); padding: 12px 16px; font-size: 0.9rem; font-weight: 600;
    margin-bottom: 14px;
}
.notice-warn { background: var(--warn-soft); color: var(--warn); }

/* ---------- vaccines ---------- */
.pets-row { display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; margin-bottom: 16px; }
.pet-tabs { display: flex; flex-wrap: wrap; gap: 8px; }
.pet-tab {
    display: inline-flex; align-items: center; gap: 8px;
    border: 1px solid var(--border); background: var(--card);
    border-radius: 999px; padding: 7px 14px;
    font-family: inherit; font-size: 0.85rem; font-weight: 600; color: var(--text);
    cursor: pointer; transition: all 0.15s ease;
}
.pet-tab:hover { border-color: var(--border-strong); }
.pet-tab.active { border-color: var(--accent-3); background: var(--accent-soft); color: var(--accent-1); }
.pet-tab-type { font-size: 0.72rem; color: var(--text-faint); font-weight: 600; }
.pet-tab-badge {
    min-width: 18px; height: 18px; padding: 0 4px; border-radius: 999px;
    background: var(--bg-soft); color: var(--text-faint);
    font-size: 0.68rem; font-weight: 700; line-height: 18px; text-align: center;
}
.pet-tab-badge.has { background: var(--danger); color: #fff; }
.empty-hint { color: var(--text-faint); font-size: 0.9rem; }

.pet-form { background: var(--card-strong); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px; margin-bottom: 16px; }
.pet-form h3 { font-size: 1rem; font-weight: 800; margin-bottom: 14px; }

.sched-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 4px; }
.sched-head .card-title { margin-bottom: 0; }
.pet-type-chip {
    display: inline-block; padding: 2px 10px; border-radius: 999px;
    background: var(--accent-soft); color: var(--accent-1);
    font-size: 0.75rem; font-weight: 700; vertical-align: middle;
}
.notif-row { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; margin: 12px 0 16px; }
.notif-note { font-size: 0.78rem; color: var(--text-faint); }

.sched-group { font-size: 0.85rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.06em; color: var(--text-faint); margin: 18px 0 8px; }
.sched-group:first-of-type { margin-top: 4px; }

.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-size: 0.9rem; }
.sched-table th, .sched-table td { padding: 10px 12px; text-align: left; border-bottom: 1px solid var(--border); vertical-align: top; }
.sched-table th { font-size: 0.75rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.05em; color: var(--text-faint); white-space: nowrap; }
.sched-table tr:last-child td { border-bottom: none; }
.vax-name { font-weight: 700; display: block; }
.vax-note { font-size: 0.75rem; color: var(--text-faint); }
.due-at { color: var(--text-dim); font-size: 0.85rem; white-space: nowrap; }
.due-date { white-space: nowrap; color: var(--text-dim); font-size: 0.85rem; }
.st-done td { opacity: 0.65; }
.st-overdue .due-date { color: var(--danger); font-weight: 700; }

/* reference table */
.ref-table { font-size: 0.88rem; }
.ref-table th, .ref-table td { padding: 7px 12px; text-align: center; border-bottom: 1px solid var(--border); }
.ref-table th { font-size: 0.75rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.05em; color: var(--text-faint); }
.ref-five td { font-weight: 700; color: var(--accent-1); }

/* ---------- footer ---------- */
.site-footer { border-top: 1px solid var(--border); margin-top: 32px; background: var(--card); }
.footer-inner { display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; padding: 28px 0; }
.footer-tag { font-size: 0.85rem; color: var(--text-dim); margin-top: 4px; }
.footer-meta { font-size: 0.78rem; color: var(--text-faint); max-width: 420px; text-align: right; }

/* ---------- responsive ---------- */
@media (max-width: 720px) {
    .nav { height: auto; flex-wrap: wrap; padding: 10px 0; }
    .nav-links { order: 3; width: 100%; justify-content: center; }
    .hero { padding: 40px 0 28px; }
    .result-side { margin-left: 0; text-align: left; }
    .footer-inner { flex-direction: column; text-align: center; }
    .footer-meta { text-align: center; }
}