:root {
    --bg: linear-gradient(135deg, #48516b 0%, #182033 45%, #040816 100%);
    --card: rgba(18, 24, 38, 0.88);
    --card-border: rgba(255, 255, 255, 0.12);
    --text: #edf1fa;
    --muted: #aab3c5;
    --accent: #8e92ff;
    --accent-soft: #bfd2ff;
}

* {
    box-sizing: border-box;
    font-family: "Zalando Sans Expanded", sans-serif;
    font-weight: 400;
    user-select: none;
}

html {
    min-height: 100%;
    background: var(--bg);
}

body {
    position: relative;
    margin: 0;
    min-height: 100dvh;
    display: flex;
    flex-direction: column;
    color: var(--text);
    line-height: 1.6;
    font-size: 16px;
    overflow-x: hidden;
    background:
        radial-gradient(circle at 18% 18%, rgba(142, 146, 255, 0.12), transparent 24%),
        radial-gradient(circle at 82% 24%, rgba(191, 210, 255, 0.08), transparent 18%),
        var(--bg);
}

body::before,
body::after {
    content: "";
    position: fixed;
    border-radius: 50%;
    pointer-events: none;
    z-index: 0;
    filter: blur(20px);
    opacity: 0.45;
}

body::before {
    width: 16rem;
    height: 16rem;
    top: -4rem;
    left: -3rem;
    background: radial-gradient(circle, rgba(142, 146, 255, 0.2), transparent 70%);
    animation: drift 18s ease-in-out infinite;
}

body::after {
    width: 14rem;
    height: 14rem;
    right: -3rem;
    bottom: -4rem;
    background: radial-gradient(circle, rgba(191, 210, 255, 0.14), transparent 70%);
    animation: drift 20s ease-in-out infinite reverse;
}

/* NAV */
.nav {
    position: relative;
    z-index: 1;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem 2rem;
}

.logo {
    font-weight: 700;
    font-size: 1.3rem;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    flex-wrap: wrap;
    justify-content: flex-end;
}

.nav-links a {
    margin-left: 0;
    color: var(--text);
    text-decoration: none;
    font-size: 0.95rem;
}

.nav-links .btn {
    text-align: center;
    display: inline-block;
    padding: 0.75rem 1.25rem;
    border-radius: 0.5rem;
    text-decoration: none;
    margin: 0;
    font-size: 0.95rem;
    min-width: 120px;
}

.auth-user {
    display: inline-flex;
    align-items: center;
    gap: 0.6rem;
}

.auth-avatar {
    width: 32px;
    height: 32px;
    border-radius: 999px;
    border: 1px solid rgba(255, 255, 255, 0.25);
    background: rgba(255, 255, 255, 0.15);
    background-size: cover;
    background-position: center;
    color: var(--text);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 0.85rem;
    font-weight: 700;
}

.auth-name {
    font-size: 0.9rem;
    white-space: nowrap;
}

.auth-logout {
    margin: 0;
}

.nav-links .auth-logout-btn {
    margin: 0;
    min-width: auto;
    padding: 0.55rem 0.9rem;
    background: transparent;
    border: 1px solid rgba(255, 255, 255, 0.25);
    color: var(--text);
}

.nav-links .auth-logout-btn:hover {
    border-color: var(--accent);
}

.nav-links .btn:hover {
    opacity: 0.8;
    outline: #f3f4f6 2px solid;
    animation: bold 0.3s forwards;
}

@keyframes bold {
    0% {
        font-weight: 400;
    }

    100% {
        font-weight: 600;
    }
}

.nav-links .btn:active {
    animation: click 0.5s ease;
}

@keyframes click {
    20% {
        transform: translateY(5px) translateX(5px);
    }
}

/* AUTH LAYOUT */
.auth-container {
    position: relative;
    z-index: 1;
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 2rem;
}

.auth-card {
    position: relative;
    overflow: hidden;
    background:
        linear-gradient(180deg, rgba(28, 35, 53, 0.96), rgba(16, 21, 34, 0.96)),
        var(--card);
    padding: 2.5rem 3rem;
    border-radius: 1rem;
    border: 1px solid var(--card-border);
    width: 100%;
    max-width: 460px;
    box-shadow:
        0 18px 40px rgba(0, 0, 0, 0.32),
        inset 0 1px 0 rgba(255, 255, 255, 0.05);
    text-align: center;
    backdrop-filter: blur(10px);
}

.auth-card::before,
.auth-card::after {
    content: "";
    position: absolute;
    pointer-events: none;
}

.auth-card::before {
    inset: 0 auto auto 0;
    width: 100%;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.45), transparent);
    opacity: 0.8;
}

.auth-card::after {
    width: 12rem;
    height: 12rem;
    top: -6rem;
    left: 50%;
    transform: translateX(-50%);
    border-radius: 50%;
    background: radial-gradient(circle, rgba(142, 146, 255, 0.14), transparent 72%);
}

.auth-card > * {
    position: relative;
    z-index: 1;
}

.auth-card h1 {
    margin: 0;
    letter-spacing: -0.03em;
    line-height: 1.05;
}

.auth-tabs {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.5rem;
    margin-bottom: 1.75rem;
}

.tab-btn {
    border: 1px solid rgba(255, 255, 255, 0.15);
    background: #1f2433;
    color: var(--text);
    padding: 0.65rem 0.9rem;
    border-radius: 0.6rem;
    cursor: pointer;
    transition: 0.2s ease;
}

.tab-btn:hover {
    border-color: var(--accent);
}

.tab-btn.active {
    background: var(--accent);
    color: #000;
    border-color: var(--accent);
    font-weight: 600;
}

.auth-panel h1 {
    margin-top: 1rem;
}

.auth-panel .up {
    margin-top: -1.5rem;
}

.hidden {
    display: none;
}

.muted {
    max-width: 24ch;
    margin: 1rem auto 3rem;
    color: var(--muted);
}

/* FORM */
.form-group {
    margin-bottom: 1.25rem;
}

.form-group .tooltip {
    font-size: 0.8rem;
    color: var(--accent);
}

.form-group .strong {
    font-weight: 700;
}

label {
    display: block;
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
}

input {
    width: 100%;
    padding: 0.8rem;
    border-radius: 0.6rem;
    border: none;
    background: #22263a;
    color: var(--text);
    font-size: 1rem;
}

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

/* BUTTONS */
.btn {
    text-align: center;
    display: inline-block;
    padding: 0.75rem 1.25rem;
    border-radius: 0.5rem;
    text-decoration: none;
    margin: 0.5rem;
    font-size: 1rem;
    border: none;
    padding: 0.9rem;
    min-width: 120px;
    cursor: pointer;
}

.primary {
    background: var(--accent);
    color: #000;
}

.full {
    width: 100%;
    margin: 0.75rem 0 0;
}

.small {
    margin-top: 1.5rem;
    text-align: center;
    font-size: 0.9rem;
}

.small a {
    color: var(--accent);
    text-decoration: none;
}

.oauth-button {
    position: relative;
    overflow: hidden;
    margin-top: 7.5rem;
    background: linear-gradient(180deg, #ffffff, #edf3ff);
    color: #111827;
    font-weight: 600;
    border: 1px solid rgba(226, 232, 240, 0.9);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.65rem;
    box-shadow: 0 12px 22px rgba(0, 0, 0, 0.16);
    transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease, background 0.2s ease;
}

.oauth-button::after {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(120deg, transparent 30%, rgba(255, 255, 255, 0.7) 50%, transparent 70%);
    transform: translateX(-120%);
    transition: transform 0.5s ease;
}

.oauth-button > * {
    position: relative;
    z-index: 1;
}

.oauth-button:hover {
    transform: translateY(-1px);
    box-shadow: 0 14px 24px rgba(0, 0, 0, 0.22);
    border-color: #c7d2fe;
}

.oauth-button:hover::after {
    transform: translateX(120%);
}

.oauth-icon {
    width: 24px;
    height: 24px;
    border-radius: 999px;
    background: #ffffff;
    color: #4285f4;
    font-weight: 700;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border: 1px solid rgba(226, 232, 240, 0.9);
}

.error {
    margin-top: 1rem;
    padding: 0.75rem 0.9rem;
    border-radius: 0.6rem;
    background: rgba(248, 113, 113, 0.1);
    border: 1px solid rgba(248, 113, 113, 0.4);
    color: #fecaca;
    font-size: 0.9rem;
}

/* FOOTER */
footer {
    position: relative;
    z-index: 1;
    text-align: center;
    padding: 1.5rem;
    font-size: 0.85rem;
    color: var(--muted);
}

@keyframes drift {
    0%,
    100% {
        transform: translate3d(0, 0, 0);
    }

    50% {
        transform: translate3d(0.75rem, -0.9rem, 0);
    }
}

/* TABLET */
@media (max-width: 1024px) {
    .nav {
        padding: 1rem 1.25rem;
    }
}

/* MOBILE */
@media (max-width: 600px) {
    .nav {
        flex-direction: row;
        gap: 0.5rem;
    }

    .nav-links {
        display: flex;
        flex-direction: row;
        flex-wrap: wrap;
        justify-content: flex-end;
        gap: 0.5rem;
        align-items: center;
    }

    .nav-links a {
        margin-left: 0;
    }

    .auth-card {
        padding: 2rem 1.5rem;
    }
}

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation: none !important;
        transition: none !important;
    }
}