:root {
    --ink: #1a1f2b;
    --paper: #f7f4ef;
    --accent: #ff7a3d;
    --accent-2: #2ab3a6;
    --muted: #6b7280;
    --shadow: 0 18px 40px rgba(26, 31, 43, 0.12);
    --radius: 18px;
}

body.register-page,
body.login-page {
    background: radial-gradient(1200px 400px at 10% -10%, #ffe7d7 0%, transparent 60%),
                radial-gradient(800px 300px at 90% 10%, #d7f4f2 0%, transparent 55%),
                linear-gradient(180deg, #faf7f2 0%, #f2efe8 100%);
    font-family: "Space Grotesk", "Rubik", "Helvetica Neue", Arial, sans-serif;
    color: var(--ink);
}

body.register-page.dark-mode,
body.login-page.dark-mode {
    --ink: #e7eaf0;
    --paper: #141821;
    --muted: #9aa3b2;
    --shadow: 0 18px 40px rgba(0, 0, 0, 0.4);
    background: radial-gradient(900px 320px at 10% -10%, rgba(255, 122, 61, 0.25) 0%, transparent 60%),
                radial-gradient(700px 280px at 90% 10%, rgba(42, 179, 166, 0.25) 0%, transparent 55%),
                linear-gradient(180deg, #0f1218 0%, #151a24 100%);
}

.register-box,
.login-box {
    width: min(440px, 94vw);
}

.register-logo a,
.login-logo a {
    font-family: "Playfair Display", "Georgia", serif;
    font-weight: 700;
    letter-spacing: 0.5px;
    color: var(--ink);
}

.register-logo img,
.login-logo img {
    filter: drop-shadow(0 8px 18px rgba(0, 0, 0, 0.15));
    border-radius: 10px;
}

.welcomeCard {
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    border: 1px solid rgba(0, 0, 0, 0.04);
    background: #fff;
    overflow: hidden;
}

body.register-page.dark-mode .welcomeCard,
body.login-page.dark-mode .welcomeCard {
    background: #1b2230;
    border-color: rgba(255, 255, 255, 0.06);
}

.welcomeCard::before {
    content: "";
    display: block;
    height: 6px;
    background: linear-gradient(90deg, var(--accent), var(--accent-2));
}

.welcomeCard button,
.welcomeCard .btn {
    margin: 8px 10px;
    border-radius: 12px;
    font-weight: 600;
    text-transform: none;
    letter-spacing: 0.2px;
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.08);
    transition: transform 0.15s ease, box-shadow 0.15s ease, filter 0.15s ease;
    color: #fff;
}

.welcomeCard button:hover,
.welcomeCard .btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 14px 26px rgba(0, 0, 0, 0.12);
    filter: saturate(1.05);
}

.btn-primary {
    background: linear-gradient(135deg, #f05a28 0%, #ff8a1f 100%);
    border: none;
    color: #fff;
    font-weight: 600;
    border-radius: 12px;
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.08);
}

.btn-primary:focus,
.btn-primary:active,
.btn-primary:hover {
    color: #fff;
}

.btn-success {
    background: linear-gradient(135deg, #1fbf83 0%, #2ab3a6 100%);
    border: none;
    color: #fff;
}

.btn-secondary {
    background: linear-gradient(135deg, #2f3640 0%, #596275 100%);
    border: none;
    color: #fff;
    border-radius: 12px;
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.08);
}

.register-card-body .login-box-msg,
.login-card-body .login-box-msg {
    font-weight: 700;
    font-size: 1.1rem;
}

.input-group .form-control {
    border-radius: 12px;
    border: 1px solid rgba(0, 0, 0, 0.08);
    box-shadow: inset 0 1px 2px rgba(0, 0, 0, 0.04);
}

body.register-page.dark-mode .input-group .form-control,
body.login-page.dark-mode .input-group .form-control {
    background: #0f131b;
    border-color: rgba(255, 255, 255, 0.12);
    color: var(--ink);
}

.input-group-append .input-group-text {
    border-radius: 0 12px 12px 0;
    background: #f4f1ea;
    border: 1px solid rgba(0, 0, 0, 0.06);
}

body.register-page.dark-mode .input-group-append .input-group-text,
body.login-page.dark-mode .input-group-append .input-group-text {
    background: #1a202c;
    border-color: rgba(255, 255, 255, 0.12);
    color: var(--ink);
}

#translateBtn {
    border-radius: 12px;
    box-shadow: var(--shadow);
}

.auth-social {
    margin: 14px 0 6px;
    text-align: center;
}

.auth-social .auth-divider {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--muted);
    font-size: 0.85rem;
    margin: 8px 0 12px;
}

.auth-social .auth-divider::before,
.auth-social .auth-divider::after {
    content: "";
    height: 1px;
    flex: 1;
    background: rgba(0, 0, 0, 0.1);
}

body.register-page.dark-mode .auth-social .auth-divider::before,
body.register-page.dark-mode .auth-social .auth-divider::after,
body.login-page.dark-mode .auth-social .auth-divider::before,
body.login-page.dark-mode .auth-social .auth-divider::after {
    background: rgba(255, 255, 255, 0.15);
}

.auth-social .social-buttons {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 10px;
}

.btn-social {
    border-radius: 12px;
    font-weight: 600;
    border: none;
    color: #fff;
    padding: 10px 12px;
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.08);
}

.btn-google {
    background: linear-gradient(135deg, #4285f4 0%, #34a853 100%);
}

.btn-apple {
    background: linear-gradient(135deg, #111111 0%, #333333 100%);
}

.btn-facebook {
    background: linear-gradient(135deg, #1877f2 0%, #0f5ec7 100%);
}

.btn-microsoft {
    background: linear-gradient(135deg, #00a4ef 0%, #0078d4 100%);
}

.btn-twitter {
    background: linear-gradient(135deg, #1da1f2 0%, #0b74c9 100%);
}

.btn-yahoo {
    background: linear-gradient(135deg, #5f01d1 0%, #3b0099 100%);
}

@media (max-width: 420px) {
    .welcomeCard button,
    .welcomeCard .btn {
        margin: 6px 8px;
    }
}