:root {
    --accent: #38bdf8;
    --accent-deep: #0ea5e9;
    --ink: #0f172a;
    --muted: #64748b;
    --page: #f1f5f9;
    --card: #ffffff;
    --card-dark: rgba(15, 23, 42, 0.82);
    --field-dark: rgba(2, 6, 23, 0.55);
}

body.app-shell {
    font-family: Pretendard, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    background:
        radial-gradient(ellipse 80% 50% at 0% 0%, rgba(56, 189, 248, 0.08), transparent 50%),
        var(--page);
    color: var(--ink);
    min-height: 100vh;
}

.app-nav {
    background: linear-gradient(120deg, #0b1220 0%, #0f172a 55%, #111827 100%);
    box-shadow: 0 10px 30px rgba(15, 23, 42, 0.18);
}

.app-nav .navbar-brand {
    letter-spacing: -0.02em;
}

.app-nav .nav-link {
    color: rgba(248, 250, 252, 0.72);
    font-weight: 600;
    font-size: 0.92rem;
}

.app-nav .nav-link:hover,
.app-nav .nav-link.active {
    color: #7dd3fc;
}

.content-wrap {
    white-space: pre-wrap;
    word-break: break-word;
}

.btn-reset {
    border-radius: 999px;
    font-size: 0.8rem;
    font-weight: 700;
    padding: 0.35rem 0.75rem;
    color: #b45309;
    background: #fffbeb;
    border: 1px solid #fde68a;
}

.btn-reset:hover {
    color: #92400e;
    background: #fef3c7;
}

.code-chip {
    font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
    background: #0f172a;
    color: #7dd3fc;
    border-radius: 999px;
    padding: 0.28rem 0.65rem;
    font-size: 0.82rem;
}

.page-card {
    border: 1px solid rgba(148, 163, 184, 0.16);
    border-radius: 1.15rem;
    background: var(--card);
    box-shadow: 0 12px 32px rgba(15, 23, 42, 0.06);
}

.page-card .card-header {
    background: transparent;
    border-bottom: 1px solid rgba(148, 163, 184, 0.12);
}

.app-shell .form-control {
    border-radius: 0.7rem;
    border-color: #e2e8f0;
    padding: 0.7rem 0.9rem;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.app-shell .form-control:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 4px rgba(56, 189, 248, 0.18);
}

.btn-accent {
    border: none;
    border-radius: 0.7rem;
    color: #fff;
    background: linear-gradient(180deg, #38bdf8 0%, #0ea5e9 100%);
    box-shadow: 0 10px 20px rgba(14, 165, 233, 0.22);
    transition: transform 0.2s ease, box-shadow 0.2s ease, filter 0.2s ease;
}

.btn-accent:hover,
.btn-accent:focus {
    color: #fff;
    filter: brightness(1.08);
    transform: translateY(-1px);
    box-shadow: 0 14px 26px rgba(14, 165, 233, 0.3);
}

.icon-tile {
    width: 3.4rem;
    height: 3.4rem;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 1rem;
    color: var(--accent-deep);
    background: #f0f9ff;
    border: 1px solid #bae6fd;
}

body.auth-screen {
    min-height: 100vh;
    margin: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: Pretendard, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    color: #f8fafc;
    background:
        radial-gradient(ellipse 90% 70% at 12% 8%, rgba(56, 189, 248, 0.16), transparent 52%),
        radial-gradient(ellipse 70% 55% at 92% 96%, rgba(99, 102, 241, 0.12), transparent 50%),
        linear-gradient(165deg, #080e1a 0%, #0f172a 48%, #111827 100%);
}

body.auth-screen::before {
    content: "";
    position: fixed;
    inset: 0;
    pointer-events: none;
    background-image:
        linear-gradient(rgba(148, 163, 184, 0.04) 1px, transparent 1px),
        linear-gradient(90deg, rgba(148, 163, 184, 0.04) 1px, transparent 1px);
    background-size: 48px 48px;
    mask-image: radial-gradient(ellipse 70% 60% at 50% 45%, #000 20%, transparent 80%);
}

.auth-wrap {
    position: relative;
    z-index: 1;
    width: 100%;
}

.auth-card {
    border: 1px solid rgba(148, 163, 184, 0.16);
    border-radius: 1.35rem;
    background: var(--card-dark);
    backdrop-filter: blur(22px) saturate(140%);
    -webkit-backdrop-filter: blur(22px) saturate(140%);
    color: #f8fafc;
    box-shadow:
        0 1px 0 rgba(255, 255, 255, 0.06) inset,
        0 18px 50px rgba(2, 6, 23, 0.45),
        0 4px 16px rgba(2, 6, 23, 0.25);
}

.auth-card::before {
    content: "";
    position: absolute;
    inset: 0 0 auto 0;
    height: 3px;
    border-radius: 1.35rem 1.35rem 0 0;
    background: linear-gradient(90deg, transparent, var(--accent), #818cf8, transparent);
}

.icon-badge {
    width: 4rem;
    height: 4rem;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 1rem;
    color: var(--accent);
    font-size: 1.85rem;
    background: linear-gradient(160deg, rgba(56, 189, 248, 0.18), rgba(14, 165, 233, 0.06));
    border: 1px solid rgba(56, 189, 248, 0.28);
    box-shadow: 0 8px 24px rgba(14, 165, 233, 0.12);
}

.auth-card .form-label {
    color: #cbd5e1;
}

.auth-card .form-control {
    background-color: var(--field-dark);
    border: 1px solid rgba(148, 163, 184, 0.22);
    color: #f8fafc;
    border-radius: 0.7rem;
    padding: 0.8rem 1rem;
    outline: none;
    transition: border-color 0.22s ease, box-shadow 0.22s ease, background-color 0.22s ease;
}

.auth-card .form-control::placeholder {
    color: #64748b;
}

.auth-card .form-control:focus,
.auth-card .form-control:focus-visible {
    background-color: rgba(2, 6, 23, 0.82);
    color: #f8fafc;
    border-color: var(--accent);
    outline: none;
    box-shadow:
        0 0 0 1px var(--accent),
        0 0 0 5px rgba(56, 189, 248, 0.22);
}

.auth-alert {
    background: rgba(127, 29, 29, 0.42);
    border: 1px solid rgba(248, 113, 113, 0.28);
    color: #fecaca;
    border-radius: 0.75rem;
}

.toast-stack {
    position: fixed;
    top: 1.15rem;
    right: 1.15rem;
    z-index: 2000;
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
    pointer-events: none;
}

.app-toast {
    min-width: 280px;
    max-width: min(420px, calc(100vw - 2rem));
    padding: 0.85rem 1rem;
    border-radius: 0.9rem;
    color: #fff;
    font-size: 0.9rem;
    line-height: 1.45;
    box-shadow: 0 14px 36px rgba(15, 23, 42, 0.22);
    opacity: 0;
    transform: translateY(-10px);
    animation: toast-in 0.25s ease forwards, toast-out 0.45s ease 2.55s forwards;
}

.app-toast.success {
    background: linear-gradient(180deg, #0f766e 0%, #0d9488 100%);
}

.app-toast.error {
    background: linear-gradient(180deg, #b91c1c 0%, #dc2626 100%);
}

@keyframes toast-in {
    to { opacity: 1; transform: translateY(0); }
}

@keyframes toast-out {
    to { opacity: 0; transform: translateY(-8px); }
}