:root{--bg: #ffffff;--fg: #1b1f24;--muted: #5b6470;--accent: #0b6e4f;--border: #d8dde3;font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif;color:var(--fg);background:var(--bg)}@media(prefers-color-scheme:dark){:root{--bg: #121417;--fg: #e8eaed;--muted: #a0a8b3;--accent: #3ccf91;--border: #2c3138}}*{box-sizing:border-box}body{margin:0;background:var(--bg)}.header{display:flex;align-items:center;justify-content:space-between;padding:12px 16px;border-bottom:1px solid var(--border)}.brand{font-weight:700;color:var(--accent);text-decoration:none}.nav{display:flex;gap:16px;align-items:center}.nav a{color:var(--fg)}.main{max-width:640px;margin:0 auto;padding:24px 16px}.calculator{display:grid;gap:8px;padding:16px;border:1px solid var(--border);border-radius:8px}.calculator input,.calculator select,.language-switcher select{font:inherit;padding:8px;border:1px solid var(--border);border-radius:6px;background:var(--bg);color:var(--fg)}.calculator-rate{color:var(--muted);margin:0}.visually-hidden{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}.form{display:grid;gap:8px;max-width:360px}.form input,.form button{font:inherit;padding:8px;border:1px solid var(--border);border-radius:6px;background:var(--bg);color:var(--fg)}.form button{margin-top:8px;cursor:pointer}.form-error{color:#c62828;margin:0}.admin-nav{display:flex;gap:16px;align-items:center;margin-bottom:24px}.admin-nav a{color:var(--fg)}.admin-nav a.active{font-weight:700;color:var(--accent)}.admin-nav button{margin-left:auto;font:inherit;cursor:pointer}.muted{color:var(--muted)}.table{width:100%;border-collapse:collapse;margin:8px 0 24px}.table th,.table td{text-align:left;padding:6px 8px;border-bottom:1px solid var(--border)}.form select{font:inherit;padding:8px;border:1px solid var(--border);border-radius:6px;background:var(--bg);color:var(--fg)}.password-field{position:relative;display:flex}.password-field input{flex:1;padding-right:44px}.form .password-toggle{position:absolute;top:50%;right:4px;transform:translateY(-50%);margin:0;padding:6px;display:flex;border:none;background:transparent;color:var(--muted);cursor:pointer}.form .password-toggle:hover,.form .password-toggle:focus-visible{color:var(--fg)}.calculator-hint{color:var(--muted);margin:0;font-size:.9em}.calculator-tiers{border-collapse:collapse;margin-top:8px}.calculator-tiers caption{text-align:left;font-weight:600;padding-bottom:4px}.calculator-tiers th,.calculator-tiers td{text-align:left;padding:4px 12px 4px 0;font-weight:400}.calculator-tiers tr.active th,.calculator-tiers tr.active td{color:var(--accent);font-weight:700}.form-wide{max-width:640px}.tiers{border:1px solid var(--border);border-radius:8px;padding:12px;display:grid;gap:8px}.tier-row{display:grid;grid-template-columns:1fr 1fr 1.4fr auto;gap:8px;align-items:end}.tier-row label{display:grid;gap:4px;font-size:.9em}.form .link-button{border:none;background:none;color:var(--accent);padding:8px 0;margin:0;text-align:left}.form .link-button:disabled{color:var(--muted);cursor:default}@media(max-width:560px){.tier-row{grid-template-columns:1fr 1fr}}