/* backend/app/static/css/auth.css
 * Professional split-panel auth screen. Loaded AFTER chat.css so it owns the
 * #auth-screen surface. Dark theme, consistent with the app palette.
 */

:root {
    --auth-accent: #a8c7fa;
    --auth-accent-strong: #7ea8f7;
    --auth-bg: #0f1115;
    --auth-panel-bg: #14171f;
    --auth-field-bg: #1a1e28;
    --auth-border: rgba(255, 255, 255, 0.10);
    --auth-border-focus: #a8c7fa;
    --auth-text: #e6ebf5;
    --auth-muted: #97a2b6;
    --auth-danger: #ff8a80;
    --auth-ok: #4ade80;
    --auth-warn: #fbbf24;
}

#auth-screen {
    position: fixed;
    inset: 0;
    z-index: 2000;
    background: var(--auth-bg);
    display: flex;
    overflow: auto;
    color: var(--auth-text);
    font-family: 'Inter', 'Segoe UI', Roboto, sans-serif;
}

.auth-shell {
    display: grid;
    grid-template-columns: 1.05fr 1fr;
    width: 100%;
    min-height: 100%;
}

/* ─── Brand panel ─── */
.auth-brand {
    position: relative;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    padding: 56px 56px 32px;
    background:
        radial-gradient(1200px 500px at -10% -20%, rgba(126, 168, 247, 0.22), transparent 60%),
        radial-gradient(900px 600px at 120% 120%, rgba(168, 199, 250, 0.12), transparent 55%),
        linear-gradient(160deg, #121826 0%, #0d1017 100%);
    border-right: 1px solid var(--auth-border);
    overflow: hidden;
}
.auth-brand::after {
    /* subtle code-grid texture */
    content: "";
    position: absolute;
    inset: 0;
    background-image: linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
    background-size: 44px 44px;
    mask-image: radial-gradient(700px 500px at 30% 30%, #000 20%, transparent 75%);
    pointer-events: none;
}
.auth-brand-inner { position: relative; z-index: 1; max-width: 460px; }

.auth-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    font-size: 1.35rem;
    letter-spacing: 0.02em;
    margin-bottom: 48px;
}
.auth-logo-mark {
    font-family: 'Fira Code', monospace;
    background: var(--auth-accent);
    color: #0b0e14;
    padding: 4px 9px;
    border-radius: 9px;
    font-size: 1rem;
    font-weight: 600;
}
.auth-logo-sub { color: var(--auth-muted); font-weight: 500; font-size: 1rem; }

.auth-headline {
    font-size: clamp(1.9rem, 3vw, 2.6rem);
    line-height: 1.14;
    font-weight: 700;
    margin: 0 0 18px;
    text-wrap: balance;
    background: linear-gradient(180deg, #ffffff, #cdd7ea);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}
.auth-sub { color: var(--auth-muted); font-size: 1.05rem; line-height: 1.6; margin: 0 0 30px; }

.auth-features { list-style: none; padding: 0; margin: 0; display: grid; gap: 14px; }
.auth-features li {
    position: relative;
    padding-left: 30px;
    color: #cdd6e6;
    font-size: 0.98rem;
}
.auth-features li::before {
    content: "✓";
    position: absolute; left: 0; top: 0;
    width: 20px; height: 20px;
    display: grid; place-items: center;
    background: rgba(168, 199, 250, 0.15);
    color: var(--auth-accent);
    border-radius: 6px;
    font-size: 0.72rem;
    font-weight: 700;
}
.auth-brand-foot { position: relative; z-index: 1; color: var(--auth-muted); font-size: 0.8rem; }

/* ─── Form panel ─── */
.auth-panel {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 40px 24px;
    background: var(--auth-bg);
}
.auth-card {
    width: 100%;
    max-width: 400px;
    background: var(--auth-panel-bg);
    border: 1px solid var(--auth-border);
    border-radius: 18px;
    padding: 36px 34px;
    box-shadow: 0 24px 60px -30px rgba(0, 0, 0, 0.7);
    animation: authIn 0.35s ease;
}
.auth-card.hidden { display: none; }
@keyframes authIn { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: none; } }

.auth-card h2 { margin: 0 0 4px; font-size: 1.55rem; font-weight: 700; }
.auth-lead { margin: 0 0 22px; color: var(--auth-muted); font-size: 0.95rem; }

.field { display: flex; flex-direction: column; margin-bottom: 15px; }
.field label {
    font-size: 0.8rem;
    font-weight: 600;
    color: #c4cede;
    margin-bottom: 6px;
    letter-spacing: 0.01em;
}
.field input {
    width: 100%;
    box-sizing: border-box;
    padding: 12px 13px;
    background: var(--auth-field-bg);
    border: 1px solid var(--auth-border);
    border-radius: 10px;
    color: var(--auth-text);
    font-size: 0.98rem;
    transition: border-color 0.15s, box-shadow 0.15s;
}
.field input::placeholder { color: #5f6b80; }
.field input:focus {
    outline: none;
    border-color: var(--auth-border-focus);
    box-shadow: 0 0 0 3px rgba(168, 199, 250, 0.15);
}
.field input.invalid { border-color: var(--auth-danger); }
.field input.valid { border-color: rgba(74, 222, 128, 0.6); }

/* password field with show/hide */
.pw-wrap { position: relative; display: flex; }
.pw-wrap input { padding-right: 62px; }
.pw-toggle {
    position: absolute;
    right: 6px; top: 50%; transform: translateY(-50%);
    background: transparent;
    border: none;
    color: var(--auth-muted);
    font-size: 0.78rem;
    font-weight: 600;
    cursor: pointer;
    padding: 6px 8px;
    border-radius: 7px;
}
.pw-toggle:hover { color: var(--auth-accent); background: rgba(255, 255, 255, 0.04); }

/* strength meter */
.pw-meter {
    height: 6px;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.07);
    margin: 10px 0 6px;
    overflow: hidden;
}
.pw-meter span {
    display: block; height: 100%; width: 0;
    border-radius: 999px;
    transition: width 0.25s ease, background 0.25s ease;
}
.pw-strength-label { font-size: 0.75rem; color: var(--auth-muted); min-height: 14px; margin-bottom: 8px; }

.pw-reqs { list-style: none; padding: 0; margin: 4px 0 0; display: grid; grid-template-columns: 1fr 1fr; gap: 4px 14px; }
.pw-reqs li {
    position: relative;
    padding-left: 20px;
    font-size: 0.76rem;
    color: var(--auth-muted);
    transition: color 0.15s;
}
.pw-reqs li::before {
    content: "○";
    position: absolute; left: 0; top: 0;
    font-size: 0.72rem;
    color: #566175;
}
.pw-reqs li.met { color: #b6f2cf; }
.pw-reqs li.met::before { content: "✓"; color: var(--auth-ok); font-weight: 700; }

.auth-optional { margin: 6px 0 8px; border-top: 1px solid var(--auth-border); padding-top: 10px; }
.auth-optional summary {
    cursor: pointer;
    font-size: 0.85rem;
    color: var(--auth-muted);
    font-weight: 500;
    list-style: none;
    padding: 4px 0;
}
.auth-optional summary::-webkit-details-marker { display: none; }
.auth-optional summary::before { content: "＋ "; color: var(--auth-accent); }
.auth-optional[open] summary::before { content: "－ "; }

.auth-btn {
    width: 100%;
    padding: 13px;
    margin-top: 12px;
    background: linear-gradient(180deg, var(--auth-accent), var(--auth-accent-strong));
    color: #0a0e16;
    border: none;
    border-radius: 11px;
    font-size: 1rem;
    font-weight: 700;
    cursor: pointer;
    transition: transform 0.08s, box-shadow 0.2s, opacity 0.2s;
}
.auth-btn:hover { box-shadow: 0 10px 24px -10px rgba(126, 168, 247, 0.6); }
.auth-btn:active { transform: translateY(1px); }
.auth-btn:disabled { opacity: 0.55; cursor: not-allowed; box-shadow: none; }

.auth-switch { text-align: center; margin-top: 18px; font-size: 0.9rem; color: var(--auth-muted); }
.auth-switch a { color: var(--auth-accent); font-weight: 600; cursor: pointer; }
.auth-switch a:hover { text-decoration: underline; }

/* messages */
.field-error {
    color: var(--auth-danger);
    font-size: 0.8rem;
    margin-top: 6px;
    display: none;
}
.field-error.show { display: block; }
#loginError, #signupError { margin-top: 4px; }
.success-msg {
    color: var(--auth-ok);
    font-size: 0.88rem;
    margin-top: 10px;
    display: none;
    text-align: center;
}

/* ─── Responsive ─── */
@media (max-width: 860px) {
    .auth-shell { grid-template-columns: 1fr; }
    .auth-brand { display: none; }
    .auth-panel { padding: 28px 18px; }
}
@media (prefers-reduced-motion: reduce) {
    .auth-card, .pw-meter span, .auth-btn { animation: none; transition: none; }
}

/* ── Account recovery ─────────────────────────────────────────────────────── */
.rec-spinner {
    display: inline-block;
    width: .85em; height: .85em;
    margin-right: .4em;
    vertical-align: -.1em;
    border: 2px solid rgba(255,255,255,.35);
    border-top-color: #fff;
    border-radius: 50%;
    animation: rec-spin .7s linear infinite;
}
@keyframes rec-spin { to { transform: rotate(360deg); } }
@media (prefers-reduced-motion: reduce) {
    .rec-spinner { animation-duration: 2.5s; }
}

.rec-sent { text-align: center; padding: .5rem 0 .25rem; }
.rec-sent .rec-check {
    width: 44px; height: 44px; margin: 0 auto .75rem;
    border-radius: 50%;
    background: rgba(52,211,153,.14);
    color: #34d399;
    font-size: 1.4rem; line-height: 44px;
}
.rec-sent h3 { margin: 0 0 .5rem; font-size: 1.05rem; }
.rec-sent p { margin: 0 0 .6rem; font-size: .88rem; color: #94a3b8; line-height: 1.5; }
.rec-sent .rec-hint { font-size: .8rem; color: #64748b; }