:root { color-scheme: light dark; --bg: #f4f5f7; --card: #fff; --fg: #1a1c20; --muted: #6b7280; --accent: #2563eb; --border: #d8dce3; --err: #c62828; }
@media (prefers-color-scheme: dark) { :root { --bg: #0f1115; --card: #181b21; --fg: #e8eaed; --muted: #9aa3af; --accent: #5b8def; --border: #2c313a; --err: #ef7373; } }
* { box-sizing: border-box; }
body { margin: 0; min-height: 100vh; display: grid; place-items: center; padding: 16px; background: var(--bg); color: var(--fg); font: 16px/1.5 system-ui, sans-serif; }
.card { width: 100%; max-width: 360px; padding: 32px 28px; background: var(--card); border: 1px solid var(--border); border-radius: 12px; }
h1 { margin: 0 0 4px; font-size: 1.4rem; }
.sub { margin: 0 0 20px; color: var(--muted); font-size: .9rem; }
form { display: grid; gap: 14px; margin-top: 20px; }
label { display: grid; gap: 6px; font-size: .9rem; color: var(--muted); }
input { padding: 10px 12px; font: inherit; color: var(--fg); background: var(--bg); border: 1px solid var(--border); border-radius: 8px; }
input:focus { outline: 2px solid var(--accent); outline-offset: 1px; }
button { padding: 11px; font: inherit; font-weight: 600; color: #fff; background: var(--accent); border: 0; border-radius: 8px; cursor: pointer; }
button:disabled { opacity: .6; cursor: default; }
.error { min-height: 1.2em; margin: 0; color: var(--err); font-size: .9rem; }
.links { list-style: none; margin: 16px 0; padding: 0; display: grid; gap: 8px; }
.links a { display: block; padding: 10px 14px; color: var(--fg); text-decoration: none; border: 1px solid var(--border); border-radius: 8px; }
.links a:hover { border-color: var(--accent); }
.logout { color: var(--muted); font-size: .9rem; }
.or { margin: 16px 0 0; text-align: center; color: var(--muted); font-size: .85rem; }
#signin-btn, #register-form { width: 100%; }
#signin-btn { margin-top: 20px; }
button.secondary { color: var(--fg); background: transparent; border: 1px solid var(--border); }
.code { margin: 8px 0; text-align: center; font: 700 2rem/1.2 ui-monospace, monospace; letter-spacing: .2em; }
#register-form { margin-top: 8px; }

/* 403 sayfası */
.denied { text-align: center; max-width: 420px; padding: 40px 28px; }
.denied .code { font: 800 6rem/1 ui-rounded, system-ui, sans-serif; letter-spacing: -.04em; color: var(--accent); opacity: .9; }
.denied .bubble { position: relative; display: inline-block; margin: 8px 0 18px; padding: 12px 18px; font-weight: 700; font-size: 1.1rem; color: #fff; background: var(--err); border-radius: 14px; animation: wobble 1.6s ease-in-out infinite; }
.denied .bubble::after { content: ""; position: absolute; left: 50%; bottom: -8px; margin-left: -8px; border: 8px solid transparent; border-top-color: var(--err); border-bottom: 0; }
.denied .sub { margin: 0 0 24px; }
.denied .actions { display: flex; gap: 10px; justify-content: center; flex-wrap: wrap; }
.btn { display: inline-block; padding: 10px 18px; font-weight: 600; color: #fff; background: var(--accent); border-radius: 8px; text-decoration: none; }
.btn.ghost { color: var(--fg); background: transparent; border: 1px solid var(--border); }
@keyframes wobble { 0%, 100% { transform: rotate(-2deg); } 50% { transform: rotate(2deg); } }
@media (prefers-reduced-motion: reduce) { .denied .bubble { animation: none; } }