/* ─────────────────────────────────────────────
   Shared site styles (used by all pages)
───────────────────────────────────────────── */

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scrollbar-gutter: stable; }

/* ── Theme tokens ── */
:root {
    --bg: #FAF9F7; --surface: #FFFFFF; --header-bg: #FAFAF9;
    --border: #E8E5E0; --border-light: #F0EDE8;
    --text: #1C1917; --text-secondary: #78716C; --text-muted: #A8A29E;
    --accent: #059669; --accent-light: #ECFDF5; --accent-border: #A7F3D0;
    --accent-strong: #047857;
    --danger: #E11D48; --danger-light: #FFF1F2; --danger-border: #FECDD3;
    --danger-strong: #BE123C;
    --warning: #D97706;
    --brand: #1B3A5C; --brand-accent: #0D9488;
    --result-grad-from: #FEFDFB; --result-grad-to: #FAF9F7;
    --calendar-box-bg: #F5F5F4;
    --result-success-bg: #ECFDF5; --result-danger-bg: #FFF1F2;
    --bg-grad-1: rgba(27, 58, 92, 0.22);
    --bg-grad-2: rgba(13, 148, 136, 0.18);
    --bg-grad-3: rgba(5, 150, 105, 0.16);
    --shadow: 0 1px 3px rgba(28,25,23,0.06), 0 1px 2px rgba(28,25,23,0.04);
    --shadow-md: 0 4px 12px rgba(28,25,23,0.08), 0 2px 4px rgba(28,25,23,0.04);
    --shadow-lg: 0 12px 32px rgba(28,25,23,0.10), 0 4px 8px rgba(28,25,23,0.05);
    --radius: 16px; --radius-sm: 10px; --radius-xs: 8px;
    --tr: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}
[data-theme="dark"] {
    --bg: #0B1220; --surface: #131A2A; --header-bg: #0F1626;
    --border: #283349; --border-light: #1E2638;
    --text: #E5E7EB; --text-secondary: #9CA3AF; --text-muted: #6B7280;
    --accent: #10B981; --accent-light: rgba(16,185,129,0.12); --accent-border: rgba(16,185,129,0.35);
    --accent-strong: #34D399;
    --danger: #F43F5E; --danger-light: rgba(244,63,94,0.12); --danger-border: rgba(244,63,94,0.35);
    --danger-strong: #FB7185;
    --warning: #F59E0B;
    --brand: #93C5FD; --brand-accent: #2DD4BF;
    --result-grad-from: #131A2A; --result-grad-to: #0F1626;
    --calendar-box-bg: #1B2336;
    --result-success-bg: rgba(16,185,129,0.08); --result-danger-bg: rgba(244,63,94,0.08);
    --bg-grad-1: rgba(45, 212, 191, 0.28);
    --bg-grad-2: rgba(147, 197, 253, 0.22);
    --bg-grad-3: rgba(16, 185, 129, 0.24);
    --shadow: 0 1px 3px rgba(0,0,0,0.4), 0 1px 2px rgba(0,0,0,0.25);
    --shadow-md: 0 6px 18px rgba(0,0,0,0.5), 0 2px 6px rgba(0,0,0,0.3);
    --shadow-lg: 0 16px 40px rgba(0,0,0,0.55), 0 6px 12px rgba(0,0,0,0.35);
}
/* No-JS fallback when system is dark */
@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) {
        --bg: #0B1220; --surface: #131A2A; --header-bg: #0F1626;
        --border: #283349; --border-light: #1E2638;
        --text: #E5E7EB; --text-secondary: #9CA3AF; --text-muted: #6B7280;
        --accent: #10B981; --accent-light: rgba(16,185,129,0.12); --accent-border: rgba(16,185,129,0.35);
        --accent-strong: #34D399;
        --danger: #F43F5E; --danger-light: rgba(244,63,94,0.12); --danger-border: rgba(244,63,94,0.35);
        --danger-strong: #FB7185;
        --warning: #F59E0B;
        --brand: #93C5FD; --brand-accent: #2DD4BF;
        --result-grad-from: #131A2A; --result-grad-to: #0F1626;
        --calendar-box-bg: #1B2336;
        --result-success-bg: rgba(16,185,129,0.08); --result-danger-bg: rgba(244,63,94,0.08);
        --bg-grad-1: rgba(45, 212, 191, 0.28);
        --bg-grad-2: rgba(147, 197, 253, 0.22);
        --bg-grad-3: rgba(16, 185, 129, 0.24);
        --shadow: 0 1px 3px rgba(0,0,0,0.4), 0 1px 2px rgba(0,0,0,0.25);
        --shadow-md: 0 6px 18px rgba(0,0,0,0.5), 0 2px 6px rgba(0,0,0,0.3);
        --shadow-lg: 0 16px 40px rgba(0,0,0,0.55), 0 6px 12px rgba(0,0,0,0.35);
    }
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
    background: var(--bg); color: var(--text); line-height: 1.6;
    min-height: 100vh; -webkit-font-smoothing: antialiased;
    transition: background var(--tr), color var(--tr);
    padding-top: env(safe-area-inset-top);
    background-image:
        radial-gradient(ellipse 80% 50% at 15% 0%, var(--bg-grad-1), transparent 60%),
        radial-gradient(ellipse 70% 50% at 100% 20%, var(--bg-grad-2), transparent 65%),
        radial-gradient(ellipse 60% 40% at 50% 100%, var(--bg-grad-3), transparent 70%);
    background-attachment: fixed;
}

.container { max-width: 1080px; margin: 0 auto; padding: 24px 16px 48px; }
@media (min-width: 768px) { .container { padding: 32px 24px 64px; } }

/* ── Site navigation ── */
.site-nav {
    display: flex; align-items: center; justify-content: space-between;
    gap: 12px; margin-bottom: 32px; padding: 10px 14px;
    background: var(--surface); border: 1px solid var(--border);
    border-radius: var(--radius-sm); box-shadow: var(--shadow);
}
.site-nav-brand {
    display: inline-flex; align-items: center; gap: 8px;
    text-decoration: none; color: var(--text); font-weight: 800;
    font-size: 0.9375rem; letter-spacing: -0.01em;
}
.site-nav-brand img { height: 28px; width: auto; }
.logo-dark { display: none; }
[data-theme="dark"] .logo-light { display: none; }
[data-theme="dark"] .logo-dark { display: inline-block; }
@media (prefers-color-scheme: dark) {
    html:not([data-theme="light"]) .logo-light { display: none; }
    html:not([data-theme="light"]) .logo-dark { display: inline-block; }
}
.site-nav-links { display: flex; align-items: center; gap: 4px; }
.site-nav-link {
    display: inline-flex; align-items: center;
    padding: 8px 12px; border-radius: 8px;
    font-size: 0.8125rem; font-weight: 700;
    color: var(--text-secondary); text-decoration: none;
    transition: all var(--tr);
}
.site-nav-link:hover { color: var(--text); background: var(--header-bg); }
.site-nav-link.active { color: var(--accent-strong); background: var(--accent-light); }
.site-nav-tools { display: flex; align-items: center; gap: 6px; }

.tb-btn {
    display: inline-flex; align-items: center; gap: 6px;
    padding: 6px 10px; min-height: 34px;
    font-size: 0.75rem; font-weight: 700;
    color: var(--text-secondary); background: var(--surface);
    border: 1px solid var(--border); border-radius: 8px;
    cursor: pointer; font-family: inherit;
    transition: all var(--tr);
}
.tb-btn:hover { color: var(--text); border-color: var(--text-muted); }
.tb-btn svg { width: 16px; height: 16px; }
.tb-btn .lang-current { color: var(--text); }

/* Dual icon/label for theme button — CSS-controlled via [data-theme] */
.theme-icon, .theme-label { display: none; }
[data-theme="light"] .icon-moon,
[data-theme="light"] .theme-label-dark { display: inline-block; }
[data-theme="dark"]  .icon-sun,
[data-theme="dark"]  .theme-label-light { display: inline-block; }
@media (prefers-color-scheme: dark) {
    html:not([data-theme="light"]) .icon-sun,
    html:not([data-theme="light"]) .theme-label-light { display: inline-block; }
    html:not([data-theme="light"]) .icon-moon,
    html:not([data-theme="light"]) .theme-label-dark { display: none; }
}
.theme-label { min-width: 44px; text-align: left; }

@media (max-width: 600px) {
    .site-nav { flex-wrap: wrap; gap: 8px; padding: 8px 10px; }
    .site-nav-brand span { display: none; }
    .site-nav-links { order: 3; flex-basis: 100%; justify-content: center;
        border-top: 1px solid var(--border-light); padding-top: 8px; }
    .site-nav-link { padding: 6px 10px; font-size: 0.75rem; }
}

/* ── Footer ── */
.site-footer {
    text-align: center; margin-top: 48px; padding: 24px 0 16px;
    border-top: 1px solid var(--border-light);
    font-size: 0.75rem; color: var(--text-muted); line-height: 1.8;
}
.site-footer a { color: var(--text-secondary); text-decoration: none; margin: 0 8px; }
.site-footer a:hover { color: var(--text); }

/* Pre-i18n hide (prevents BG↔EN text flash) */
html.pre-i18n body { visibility: hidden; }

:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }